Synthesis and Antiproliferative Activity of Chalcone-Imide Derivatives Based on 3,4-Dichloro-1H-Pyrrole-2,5-dione
Mohamed A. A.
Radwan
Department of Chemistry, College of Science, Qassim University, Buraydah, Kingdom of Saudi Arabia.
author
Fahad M.
Alminderej
Department of Chemistry, College of Science, Qassim University, Buraydah, Kingdom of Saudi Arabia.
author
Hala E. M.
Tolan
Department of Photochemistry, National Research Centre, Dokki, P.O. Box.12622, Cairo, Egypt.
author
Hanem M.
Awad
Tanning MaterialsandLeather Technology Department, National Research Centre, El‐Behouth St, Dokki, Cairo 12311, Egypt
author
text
article
2021
eng
A series of chalcone imide derivatives, 4'-aminochalcones-based dichloromaleimides, was synthesized from the reaction of 1-(4-acetylphenyl)-3,4-dichloro-1H-pyrrole-2,5-dione with various substituted aldehydes, or by treating 4'-aminochalcone with 3,4-dichlorofuran-2,5-dione in an alternative path. The structures of chalcone imide derivatives were established using IR, 1H NMR, 13C NMR, and mass spectroscopy. Antiproliferative effects of the newly synthesized compounds have been screened on two human cancer types via the MTT assay. Compounds with p-tolyl-1H-pyrrole-2,5-dione, and 4-bromophenyl-1H-pyrrole-2,5-dione derivatives, are highly active on the human liver cancer (HepG-2). On the other hand, all compounds were found to be more effective against breast cancer cells (MCF-7) than the positive control doxorubicin. The results of this work provide a basis for further research of selected chalcone-imide moiety as antiproliferative agents.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
1
9
https://ejchem.journals.ekb.eg/article_102658_d0f71e414f99552517bf6a2e7b255d99.pdf
dx.doi.org/10.21608/ejchem.2020.32862.2694
An Unusual Corrosion Product, Kobyashevite, From Ancient Egyptian Copper Artifacts: Technical Note
Manal
Maher
Researcher in Post Graduate Studies College of Nanotechnology, Cairo University; Head of Computed Tomography X-Ray unit, Cairo Egyptian Museum, Ministry of Antiquities, Egypt
author
Yussri
Ali
Lecturer, Conservation Department, Faculty of Archaeology, South Valley University, Qena 83523, Egypt
author
text
article
2021
eng
Kobyashevite is one of copper sulfate hydroxide hydrate minerals “devilline group”. It forms as a thin coating crust in calcite and gypsum veins and it takes flower-like morphology and its color varies between the bluish-green to turquoise-blue. In the laboratory studies, it has been synthesized in humid atmospheric air containing sub-ppm of SO2. In the corrosion studies of archeological metals, it has not been identified before. Fortunately, the case study objects have never been undergone any conservation processes before, which gives originality of the analyzed samples and more accurate results. Scanning electron microscopy-energy dispersive X-ray spectroscopy, X-ray diffraction, X-ray fluorescence, and Raman spectroscopy have been carried out in order to identify the corrosion samples. The present study identified a "kobyashviete" corrosion product for the first time in the archaeological studies on some archeological copper artifacts from the Egyptian Museum in Cairo. The study has been suggested that the formation of the unusual corrosion product "kobyashviete" is due to exposure the case study to uncontrolled long–term humid storage environment which has been contaminated with a high percentage of sulfur gases.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
11
23
https://ejchem.journals.ekb.eg/article_110430_4358ae468c751690024ef45af3bb7afb.pdf
dx.doi.org/10.21608/ejchem.2020.36950.2763
Cloud Point Extraction of Copper Using 4-(2-Chloroacetamido)- Salicylic Acid as a Complexing Agent
Huda
Altantawy
Chemistry Department, Faculty of Science, Mansoura University, Mansoura 35516, Egypt.
author
Wael
Mortada
Urology and Nephrology Center, Mansoura University, Mansoura 35516, Egypt.
author
ehab
Abdel-Latif
Chemistry Department, Faculty of Science, Mansoura University, Mansoura 35516, Egypt.
author
Yasmeen
Abou El-Reash
Chemistry Department, Faculty of Science, Mansoura University, Mansoura 35516, Egypt.
author
text
article
2021
eng
A micelle-mediated procedure was presented for enrichment of Cu2+ using 4-(2-chloroacetamido)-salicylic acid and Triton X-114 as complexing and extracting agents, respectively. The experimental parameters that affect the extraction were investigated and optimized. Good analytical features were achieved including limit of detection (0.25 µg L-1), limit of quantification (0.83 µg L-1), linearity (1.0-500 µg L-1) and reproducibility (2.2%). For 50.0 mL sample, the enrichment factor was 49.5. Most concomitant ions not interfere with Cu2+ determination. The procedure was employed for preconcentration and determination of Cu2+ in different samples (water, blood and urine) by flame atomic absorption spectrometry with satisfying results.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
25
32
https://ejchem.journals.ekb.eg/article_113415_f525d4aac2c439596e045dfcc968e50c.pdf
dx.doi.org/10.21608/ejchem.2020.39848.2813
Effect of Preparation Parameters and Sintering Conditions on the Properties and Microstructure of Nickel Pellets Prepared by Conventional Powder Metallurgy
Lamiaa Z.
Mohamed
Mining, Petroleum, and Metallurgical Engineering Dept., Faculty of Engineering, Cairo University, Egypt.
author
Omayma A.
El kady
Powder Technology Division, Central Metallurgical Research and Development Institute (CMRDI), Helwan,
Egypt.
author
Mohamed. M.
Lotfy
Mining, Petroleum, and Metallurgical Engineering Dept., Faculty of Engineering, Cairo University, Egypt.
author
Hafiz A.
Ahmed
Mining, Petroleum, and Metallurgical Engineering Dept., Faculty of Engineering, Cairo University, Egypt.
author
Fawzi A.
Elrefaie
Mining, Petroleum, and Metallurgical Engineering Dept., Faculty of Engineering, Cairo University, Egypt.
author
text
article
2021
eng
Eleven types of nickel pellets were prepared from two types of nickel powders. The first type of Ni powder had filamentary particles in shape with particle size less than 63 µm, the second type of Ni powder possessed nearly spherical particles in shape with particle size less than 149 µm. One type of pellets was prepared from Ni(B) powder whose particle size was reduced to less than 70 µm. The pellets were fabricated by conventional powder metallurgy. Green pellets were initially formed by compaction under 420 MPa and then sintered at 1200 °C. The dependence of the characteristics and microstructure of sintered pellets on particle shape, size of particles, powder milling, binder addition, holding time at 1200 °C, and the rate of raising green pellets temperature at the early stage of heating was investigated. Weighing in air and in floating liquid (water), measuring the sintered pellets volume, X-ray diffractometry, optical microscopy, scanning electron microscopy, X-ray energy dispersion analysis, and Vickers microhardness measurements were used to determine the properties and microstructures of fabricated pellets. The apparent density and microhardness of pellets prepared from filamentary particles with the addition of wax as a binder were the highest, about 8.23 gm/cm3 and 158 VHN, respectively.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
33
45
https://ejchem.journals.ekb.eg/article_106876_67833eb51f216850956d6fb0e411f599.pdf
dx.doi.org/10.21608/ejchem.2020.28882.2621
1,3-Dipolar Cycloaddition: Free Catalytic Synthesis and Esophageal Cancer Activity of New 1,2,3-Triazole-Oxydianiline-Maleimide Hybrids
Mohammed
Mohammed
Department of Chemistry, College of Education for Pure Sciences, Basrah University, Basrah, Iraq
author
Faeza
Almashal
Department of Chemistry, College of Education for Pure Sciences, Basrah University, Basrah, Iraq
author
Ahmed
Jassem
Department of Chemistry, College of Education for Pure Sciences, Basrah University, Basrah, Iraq
author
text
article
2021
eng
A new series of 1,2,3-triazole-oxydianiline-maleimide hybrids 12-15 was synthesized by using 1,3-dipolar cycloaddition reaction of N-Arylmaleimides 6-9 with 4,4'-oxybis(azidobenzene) 11 under an efficient and free catalytic reaction. All the newly synthesized hybrids were characterized by their 1H NMR, F-TIR, Mass spectral data and melting points. The cytotoxic activities (in vitro) of selected hybrids against esophageal cancer of human cell line (SKG) were evaluated by MTT assay. Among them, hybrid 13 exhibited a potent inhibition activity with the IC50 value of 1.61±0.01 μM against esophageal cancer cell (SKG). Cellular mechanism investigations in esophageal carcinoma cells (SKG) elucidated that hybrid 13 inhibited cell growths in vitro and arrested cell cycle at an environmental phase. These results revealed that hybrid 13 holds a promising anticancer agent with the enhancement of further clinical applications in drug discovery field.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
47
53
https://ejchem.journals.ekb.eg/article_103951_350fe49d341ecd90193d3a91fb16f956.pdf
dx.doi.org/10.21608/ejchem.2020.29188.2629
Quantum Impedance of Proton and Beta Particle by Employing the DE-Broglie Hypothesis alongside Heisenberg’s Uncertainty Principle
Firas
Aljomaily
Department of Physics, Science College, Mosul University, Mosul, Iraq.
author
Laith
Najam
Department of Physics, Science College, Mosul University, Mosul, Iraq.
author
Hala
Jasim
Department of Physics, Science College, Mosul University, Mosul, Iraq.
author
Rana
Abdulfattah
Department of Physics, Science College, Mosul University, Mosul, Iraq.
author
text
article
2021
eng
IN this paper, alongside Heisenberg's principle of uncertainty, the De-Broglie wavelength hypothesis was used to conclude at a new understanding of the quantum impedance shown by the proton when interacting with the material. It also extracted the quantum impedance, speed, and frequency of electron (a beta particle with energy below 1MeV). This assumed that the electrons and protons have the same wavelength when interacting with the material at a high- voltage vacuum power supply. These formulas can be considered as one of the important applications in nanotechnology that can be used in the field of radiotherapy. The findings obtained concerning beta particle velocity showed that they are compatible with their established formulations, but with a new method. Furthermore, the Beta particle frequency formula may be viewed as a new version. The use of uncertainty in determining the location and momentum of the proton and the beta particle has also been found to have a significant impact in achieving their quantum impedances. Besides that, the quantum impedance of beta particle was obtained according to the principle of conductivity. The results showed the relevance of equation 8 when evaluating the impedance of the proton. It is attributed to the inclusion of the Mp / Me ratio, in addition to the similarity of the remaining variables with the content of the beta particle's quantum impedance formula. The Die-Broglie wavelength was determined, as opposed to the usual. Results showed that a linear relationship between the velocity of the beta ray and its frequency with the power supply.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
55
62
https://ejchem.journals.ekb.eg/article_106487_7f6373da2b2515aae696cd68363fc12e.pdf
dx.doi.org/10.21608/ejchem.2020.31036.2689
Tracing TOC concentration and SUVA254 in surface water, treated water and wasted aluminum sludge
Mahmoud
Hussein
Basic sciences, Institute of environmental research and studies, Ain Shams University
author
Mostafa
Khalil
Chemistry Department, Faculty of Science, Ain Shams University
author
Ahmed
El-Gendy
Department of Construction Engineering, School of Sciences and Engineering, The American University in Cairo, New Cairo, Egypt
author
Taha
Razik
Environmental basic sciences, Institute for Environmental Studies and Research, Ain Shams University, Cairo, Egypt
author
text
article
2021
eng
Safe water production is the world's primary concern; however, organic pollution is a continuous threat to it. Egypt depends primarily on the Nile River to supply potable water. Organic pollution threatens freshwater, and it is reduced through effective conventional treatment, but using disinfectants generates harmful byproducts. This study aims to the evaluation of conventional treatment in eight WTPs in Cairo. Water Treatment Plants (WTPs) were chosen in greater Cairo to perform this study throughout the year 2018. Raw, tap water and sludge TOC was measured. Raw and tap waters SUVA254 is calculated to determine the WTP's efficiencies to reduce DBPs formation probability. The maximum and minimum TOC obtained in winter and summer, respectively. SUVA254 increased in Mostorod WTP and reduced in other WTPs. In conclusion, the Nile river organic matter is natural with a minimum amount of industrial origin, but the Ismailia canal suffers from industrial spills.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
63
73
https://ejchem.journals.ekb.eg/article_105971_2a4f521a4f82693b8a54e5c062808524.pdf
dx.doi.org/10.21608/ejchem.2020.34664.2724
Molecular Modeling Analyses and Vibrational Characteristics for Nitromethane
Hend A.
Ezzat
Nano Technology Unit, Space Lab, Solar and Space Research Department, National Research Institute
of Astronomy and Geophysics (Nano NRIAG), Helwan, Cairo, Egypt
author
Hanan
Elhaes
Physics Department, Faculty of Women for Arts, Science and Education, Ain Shams University, 11757
Cairo, Egypt.
author
Ahmed
Refaat
Molecular Spectroscopy and Modeling Unit, Spectroscopy Department, National Research Centre, 33
El-Bohouth Str. 12622 Dokki, Giza, Egypt
author
Mohamed S.
Abdel-Aal
Molecular Spectroscopy and Modeling Unit, Spectroscopy Department, National Research Centre, 33
El-Bohouth Str. 12622 Dokki, Giza, Egypt
author
Medhat A.
Ibrahim
Molecular Spectroscopy and Modeling Unit, Spectroscopy Department, National Research Centre, 33
El-Bohouth Str. 12622 Dokki, Giza, Egypt
author
text
article
2021
eng
Molecular modeling is considered as an effective tool for the evaluation of many physical as well as spectroscopic parameters. In this study semiempirical AM1, PM5, ab initio methods HF and MP2 as well as density functional methods VWN, B88LYP, B88PW91, B3PW91 and B3LYP were used to study nitromethane in its gas phase. The optimized structure, some physical parameters, and vibrational spectrum were calculated and discussed. The calculated optimized structure indicated that nitromethane (NM) belongs to the point group C2V. The obtained data indicated that quantum mixing gives results comparable to both ab initio method in accuracy and semiempirical method in computation time. It is concluded that for a small structure like NM, quantum mixing method provides reliable results in a short computation time. At B3LYP/6-31G(d,p) level, polar solvents showed changes in both HOMO/LUMO band gap energy and molecular electrostatic potential. This is an indication for the stability of NM in different chemical environments.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
75
84
https://ejchem.journals.ekb.eg/article_106879_637cc0806d7704d2e6c42933110ffd2d.pdf
dx.doi.org/10.21608/ejchem.2020.35452.2736
Application of Graphene/Nickel Oxide Composite as a Humidity Sensor
Ahmed M.
Bayoumy
Physics Department, Biophysics Branch, Faculty of Science, Ain Shams University, 11566, Cairo, Egypt
author
Islam
Gomaa
Holding Company for water and wastewater, Ismailia, Egypt.
author
Hanan
Elhaes
Physics Department, Faculty of Women for Arts, Science and Education, Ain Shams University, 11757 Cairo,
Egypt
author
Mohamed
Sleim
Spectroscopy Department, National Research Centre, 33 El-Bohouth Str. 12622 Dokki, Giza, Egypt
author
Medhat A.
Ibrahim
Spectroscopy Department, National Research Centre, 33 El-Bohouth Str. 12622 Dokki, Giza, Egypt
author
text
article
2021
eng
Molecular modeling analyses at Density functional theory DFT level was used to study the possible application of modified graphene (G) as gas sensor. A model molecules of graphene sheet was constructed then modified with nickel oxide NiO attached to graphene through covalent bonds forming G/NiO composite. DFT at B3LYP/6-31G(d,p) was utilized to investigate the physical properties of G; G/NiO; G/NiO/2H2O. Results show that interacting G/NiO composite with water molecules lowers the calculated energy of the formed structure reflecting the possibility of exposing G/NiO structure to humidity, since it forms more energetically stable composition that can be detected by a proper circuit. However, water addition results in significant reduction in the TDM which would enhance its stability. This would increase the efficiency of G/NiO material as a humidity sensor. Mapping molecular electrostatic potential indicated that, the impact of interacting with G/NiO composite through Ni end increases electron cloud on the terminals ensuring the great ability of this region to sense different water molecules. It is concluded that, the change in the physical properties of G/NiO under the influence of water molecules took place. Collecting these data together, it is clear that the studied G/NiO composite could act as humidity sensor.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
85
91
https://ejchem.journals.ekb.eg/article_106880_61520bfd6ee01aebf10fdd82c7f36847.pdf
dx.doi.org/10.21608/ejchem.2020.36453.2753
3D-Molecular Modeling, Antibacterial Activity and Molecular Docking Studies of Some Imidazole Derivatives
Dhafer S.
Zinad
Applied Science Department, University of Technology, Baghdad 10001, Iraq.
author
Ahmed
Mahal
Key Laboratory of Plant Resources Conservation and Sustainable Utilization and Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, People’s Republic of China.
author
Abdulqader M.
A-Qader
Chemistry Science Department, Al-Iraqia University, Baghdad, Iraq.
author
Siswandono
Siswodihardjo
Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Universitas Airlangga, Jalan Airlangga No. 4-6, Surabaya 60115, Jawa Timur, Indonesia
author
Mohammad Rizki Fadhil
Pratama
Department of Pharmacy, Faculty of Health Sciences, Muhammadiyah University of Palangkaraya, Palangka Raya 73111, Indonesia
author
Ranjan
Mohapatra
Department of Chemistry, Government College of Engineering, Keonjhar-758002, Odisha, India
author
text
article
2021
eng
In the present work, we have reported the theoretical and biological activities of some imidazole (MIPBD, CMIBP, MIBPBD) derivatives. Here, the synthesis of one novel substituted imidazo-amino pyridinyl derivative (MIPBD) has also been reported. The structure of this compound was identified by NMR and mass spectroscopy. Molecular modeling studies have confirmed that CMIBP (ΔE= 0.16508 eV) is more stable than others. Antibacterial investigation exhibited good to excellent activity for all these compounds against two tested bacterial strains (S. aureus and E. coli). Moreover, molecular docking studies were carried out, which was consistent with experimental studies. The results motivate us for further studies of imidazole derivatives which will be helpful for the development of novel antibacterial agents.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
93
105
https://ejchem.journals.ekb.eg/article_109676_3c0cfcaa09bcbf937fcbfb780f30ef40.pdf
dx.doi.org/10.21608/ejchem.2020.31043.2662
Evaluation of the dynamic mechanical analysis, water absorption and chemical resistance properties of sulfur/epoxy composites
Mohammed
Eldesouki
1 Ahmed El-Zomor Street, El Zohour Region - Nasr city - Cairo
author
Zeinab
abo-shanab
Petroleum Applications Department, Egyptian Petroleum Research Institute (EPRI), Cairo, Egypt.
author
Mohammed
Mohammedy
bPetroleum Application Department,Egyptian Petroleum Research Institute,Cairo11727,Egypt
author
Mohamed
Elshafie
Petroleum applications department, Egyptian Petroleum Research Institute (EPRI), Cairo, Egypt.
author
Mohamed
Abo Riya
Chemistry department, faculty of science, benha university, benha
author
Sanaa
Elkholy
Petroleum Applications department, Egyptian Petroleum Research Institute, Cairo, Egypt
author
text
article
2021
eng
Modified epoxy composites have become attractive materials for various applications including coatings, polymer concrete, and with asphalt as steel bridge pavement material. In such applications, it is important to maintain high chemical and mechanical resistance to avoid load cracking and corrosion resulted from chemicals exposures. The purpose of this study is to produce sulfur/epoxy composites with excellent mechanical and chemical properties and able to be applied easily in a wide range of applications. the epoxy resin was mechanically mixed with different percentages of sulfur and linseed oil to form sulfur/epoxy composites. Where sulfur is well incorporated into the epoxy matrix. The prepared composites were characterized by dynamic mechanical analysis including storage modulus, loss modulus, and tan delta. In addition, the chemical and water absorption resistance was tested including two hours boiling water absorptance resistance and long-term water absorptance resistance. the results showed enhanced storage modulus, glass transition temperature, chemicals, and water absorption resistance. Also, it is observed that as the concentration of sulfur increases, the mechanical and chemical resistance properties increase.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
107
115
https://ejchem.journals.ekb.eg/article_106878_b948073c997bf6caba7836891c5068f3.pdf
dx.doi.org/10.21608/ejchem.2020.35160.2729
New Barbiturate Derivatives as potent in vitro α-Glucosidase Inhibitors
Ali
Radhi
Faculty of Pharmacy, Al-Kafeel University, Najaf, Iraq.
author
Ezat
Zimam
Department of Chemistry, Faculty of Science , Kufa University, Najaf, Iraq
author
Emad
Jafer
Babylon Technical Institute, Al-Furat Al-Awsat Technical University, Al-Kuf, Iraq
author
text
article
2021
eng
Abstract: A series of new Schiff base derivatives were synthesized by reaction barbiturate derivatives (barbital and phenobarbital) with some aromatic aldehydes. Barbital and phenobarbital were treated with formaldehyde in ethanol as solvent to produce a and b. Then reaction compounds a or b with paratoluenesulfonylchloride in DCM and presence triethylamine to form (1,3(2H,4H)-diyl)bis(methylene)bis(4-methylbenzene sulfonate) barbiturate 1a and 1b. Nucleophilic substitution reaction of compound 1a or 1b with sodium amide or with hydrazine hydrate to form barbiturate derivatives contain free amino group2a, 3a,2b and 3b. barbiturate derivatives which contain free amino or hydraznyl group reacted with some aromatic benzaldehyde to preparation final products 1-8 (Schiff base derivatives). The structures of the prepared derivatives were identified by many spectroscopic methods such as Mass, NMR, FTIR spectroscopy and the elemental analysis(C,H,N). The end products were evaluated in vitro α-glucosidase inhibitory activity. All Schiff base derivatives were showed α-glucosidase inhibition with IC50 values 110 ± 2.15, 197 ± 3.11, 38 ± 0.84, 64 ± 1.78, 119 ± 3.55, 204 ± 2.08, 32 ± 1.42, 81 ± 2.23 µM respectively, when compared to the standard drug acarbose (IC50 =787.27 ± 2.23 µM).
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
117
123
https://ejchem.journals.ekb.eg/article_105966_4373cc5853253c308b5c88d3e5d24087.pdf
dx.doi.org/10.21608/ejchem.2019.16210.1991
Fabrication of TiO2 nanotubes via three - electrodes anodization technique under sound waves impact and use in dye-sensitized solar cell
Qahtan
Yousif
Chemistry department / college of education / university of Al-Qadisayah
author
Noura
Haran
Department of chemistry, College of science , University of Al-Qadisiyah
author
text
article
2021
eng
The present work included study the formation of the arrays TiO2 nanotubes (TiO2-NT) on the Titanium foil during anodization using three-electrode systems under the influence of ultrasound waves. It reduces the time of fabrication to 30 min. at a constant voltage of about 20 V in the ethylene glycol electrolyte solution. The FE-SEM and AFM results have exhibited the formation of nanotubes 7.09 μm in length with an average diameter of 21.24 nm in the presence of ultrasound. The XRD results have confirmed the dominant anatase phase with high purity. The results of J-V curves show optimized conditions of titanium dioxide nanotubes dye-sensitized solar cell (TiO2-NT-DSSC).The photoelectrochemical parameters are perfect if compared to solar cell fabrication in the absence of ultrasound. Hence, the full factor of energy conversion efficiency is estimated to be about 0.436 under simulated sunlight of 100 mW/cm2.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
125
132
https://ejchem.journals.ekb.eg/article_109006_3f196ce6c18ac19f8e36d2526261a50f.pdf
dx.doi.org/10.21608/ejchem.2020.28233.2596
Corrosion Behavior of Ni And Ni-Base Alloy in Acidic Solutions
Lamiaa
Mohamed
Mining, Petroleium, Metallurgical Engineering Dept., Faculty of Engineering, Cairo Univerrsity
author
text
article
2021
eng
The corrosion behavior of pure Ni and 65Ni-24Cr-10Mo alloy in HCl and H2SO4 solutions were investigated using weight-loss and electrochemical methods. The effects of temperature and acidic media were studied to define the main differences in the corrosion behavior of these materials. The results of both techniques revealed lower values of corrosion rates for the 65Ni-24Cr-10Mo alloy compared to pure Ni. Generally, the corrosion rates for both materials increase with increasing temperature in both acids with higher rates in HCl compared to H2SO4 at all conditions. Results of weight-loss and potentiodynamic tests were in a good agreement and indicated that the alloy 65Ni-24Cr-10Mo is a high resistance to corrosion in HCl and H2SO4 acidic solutions than pure Ni. The activation energies (𝐸𝑎) of the dissolution process of Ni and alloy have calculated. The activation energy of Ni in HCl is 18 kJ/mole and in H2SO4 is 20 kJ/mole where for the alloy in HCl is 18 kJ/mole and in H2SO4 is 32 kJ/mole.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
133
142
https://ejchem.journals.ekb.eg/article_112480_b9c223110b38b825e1e860654f87318a.pdf
dx.doi.org/10.21608/ejchem.2020.40019.2814
Removal of Basic Dyes from Aqueous Solution Onto H2SO4-modified Rice Husk
Ghada
Mohamed
Physical Chemistry Department, National Research Centre, 12622 Dokki, Cairo, Egypt
author
Wafaa
Rashwan
National Research Centre
Physical Chemistry Department, Faculty of Science, Cairo University
author
Thoria
El-Nabarawy
Physical Chemistry Department, National Research Centre, 12622 Dokki, Cairo, Egypt
author
Abdel Naser
El-Hendawy
National Research Centre, 30 El-Tahrir Street
author
text
article
2021
eng
Rice husk, as local agricultural waste, was modified by treating it with H2SO4 to obtain a low-cost and an effective adsorbent. This adsorbent was investigated for the removal of basic violet 10 (BV) and basic yellow 28 (BY) dyes from aqueous solutions via batch adsorption procedure. The experiments included the initial concentration of dye, contact time and temperature. Langmuir, Freundlich, and Dubinin–Radushkevich models were studied to follow the adsorption process. The results reveal that the Langmuir model showed a better fit to the equilibrium adsorption data and the adsorption kinetics fit the pseudo-second-order model. Scanning electron microscopy (SEM) and Fourier-transform infrared spectroscopy (FTIR) were used in the course of characterization. The intraparticle diffusion model via the mass transfer was applied to examine the mechanisms of the rate-controlling step. It was found that intraparticle diffusion was mostly the rate controlling step in the adsorption of BV dye only, while the thermodynamic parameters (ΔH˚, ΔS˚, and ΔG˚) showed that the adsorption process is a typical chemical, spontaneous, and exothermic in nature.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
143
155
https://ejchem.journals.ekb.eg/article_114338_ae2f8be7aa79eda5c14f0ab8d50f6898.pdf
dx.doi.org/10.21608/ejchem.2020.39613.2807
A Novel Photoprobe Based On Nano Tris(3-acetylindole)-terbium(III) Complex For The Quantitative Determination of Epinephrine In Blood Samples
mostafa
elsaady
Chem. Dep., Fac. of Sci., Ain Shams Uni.
author
ahmed
Youssef
Chemistry Department, Faculty of Science, Ain Shams University, Abbassia, Cairo, Egypt
author
Mohamed
Attia
Chemistry Department, Faculty of Science, Ain Shams University, Abbassia, Cairo, Egypt
author
Mohamed Sabry
Abdel-Mottaleb
Department of Chemistry, Faculty of Science, Ain Shams University
author
text
article
2021
eng
A New photoprobe based on tris(3-acetylindole) terbium (III) complex (TbAcI) doped in polyethylene glycol (PEG) thin-film was synthesized, and employed as a novel, simple, sensitive, accurate, and precise method for the determination of Epinephrine (EPI) in different serum samples. The results obtained from the Stern-Volmer bimolecular quenching analysis was attributed to the presence of EPI in the surrounding of the emissive TbAcI. The calibration plot was prepared for the concentration range of 1-1500 pg/mL of EPI with a correlation coefficient of 0.99 and a detection limit of 0.1 pg/mL. That may aid in assessing the activity of the adrenal gland and then the diagnosis of optimal diseases that may be raised due to the abnormal ranges in human blood.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
157
164
https://ejchem.journals.ekb.eg/article_112668_5faaf344558f49681f969835787db125.pdf
dx.doi.org/10.21608/ejchem.2020.37301.2768
Heavy Metals in Citrus Fruits as Affected by Primary Treated Sewage Irrigation
Hussein
Abdel-Shafy
Water Research & Pollution Control Department, National Research Center, Dokki, Cairo, Egypt
author
Mohamed
El-Khateeb
Water Pollution Control Dep., National Research Center, Dokki, Cairo, Egypt
author
text
article
2021
eng
Water recycling and reuse of adequate treated wastewater can be considered as supplementary water resources and an alternative for irrigation, particularly in the arid and semi-arid countries for improving the fertility of the sandy soi1and to fulfill the Millennium Development Goals. In Egypt, sewage irrigation farms are only allowed for irrigating woody trees. In the present study very limited experimental area in this experimental farm was planted with Citrus fruits for a short period. This work aims to investigate the distribution pattern of heavy metals in the different parts of citrus trees. Monthly samples of different types of irrigation water (treated wastewater, groundwater, and fresh canal water) were collected. Both physicochemical characteristics and heavy metal concentration were evaluated. Different citrus plant samples and fruits from three different species of citrus trees were collected from the sewage farm as well as the farms irrigated with groundwater and Canal water. All citrus tree samples were partitioned into: leaves, stem and citrus fruit. The fruits were divided to the outer crust, and squeezed juice. The results showed that the level of metals in treated wastewater was within the permissible limits; however the citrus trees irrigated by this water were the highest in metals accumulation. One important notice is that the toxic metals including Cd, Pb, Ni, Cr in all cases were at the lowest and/or below detection limit, particularly, in the citrus juice. The outer crust of the citrus fruits contained the second lowest level of all metal. Thus, the citrus fruits showed no accumulation of heavy metals. This could be explained by the fact that heavy metals were up taken by the roots and only smaller fractions were trans-located to the other parts of the tree. The essential nutrient metals including Fe, Mn, and Zn were accumulated mostly by leaves and stems. It was concluded that heavy metal accumulated differently according to the plant species, and the part of the tree and fruit. Such fluctuations are governed by the irrigating water, pH of the soil, plant uptake and/or water-soil-to-plant transfer factors. Other factors include temperature, moisture, organic matter, phosphorous content and the availability of the other nutrient elements and/or water-soil-to-plant transfer factors. The present experimental study showed that the primary treated wastewater should not be used for irrigating any edible plant.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
165
176
https://ejchem.journals.ekb.eg/article_105970_c1a287df6592c0b617e6c39666edd953.pdf
dx.doi.org/10.21608/ejchem.2020.32685.2693
Synthesis of Thiol Amine Surfactant for Sensor Fabrication to Determine Chromium(III) Ions in Different Water Samples
Tamer
Ali
Egyptian Petroleum Research Institute (EPRI), 11727, Cairo, Egypt.
author
Ahmed
Al-Sabagh
Egyptian Petroleum Research Institute (EPRI), 11727, Cairo, Egypt.
author
text
article
2021
eng
A thiol amine surfactant, poly-3-(dodecylthio)-N-hexadecylacrylamide (iphI) was prepared and characterized using spectral methods of analyses. The proposed potentiometric method was based on the fabrication of iphI-modified carbon paste (iphI-MCPE; electrode IV) sensor. Fast, highly sensitive and wide dynamic range potentiometric sensor was constructed using the prepared ionophore to quantify Cr(III) ions in spiked water sample under optimum conditions. The electrode (IV) exhibited an excellent Nernstian response to Cr(III) ion ranging from 4.8 × 10-7 to 1.0 × 10-2 mol L-1 with a detection limit of 4.8 × 10-7 mol L-1 and a slope of 19.59±0.45 mV decade-1 over a wide pH range (2.0-8.0) with a fast response time (7 s) at 25 oC. The proposed sensor showed fairly good discriminating ability towards Cr(III) ion in comparison with many hard and soft metal ions. The developed electrode has been successfully applied for the Cr(III) ions potentiometric determination in different water samples. The results obtained compared well with those obtained using atomic absorption spectrometry.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
177
185
https://ejchem.journals.ekb.eg/article_112478_b6dec26281b3e943739edd143cac77b9.pdf
dx.doi.org/10.21608/ejchem.2020.37861.2780
Formulation of Mouth Dissolving Strips of Metoprolol Succinate Using Locust Bean Gum
Rajni
Bala
Chitkara college of Pharmacy
Chitkara University
Punjab
author
Reecha
Madaan
Chitkara College of Pharmacy, Chitkara University, Punjab India
author
Radha
Gupta
Chitkara College of Pharmacy, Chitkara University, Punjab, India
author
Rakesh
Chawla
Department of Pharmaceutical Chemistry, University Institute of Pharmaceutical Sciences and Research, Baba Farid University of Health Sciences, Faridkot
author
Ujjwal
Sahoo
Dr. B C Roy College of PHARMACY and AHS
author
text
article
2021
eng
The current project was carried out to investigate the use of locust bean gum as a film forming agent in the development of fast dissolving oral strips that can be utilized for the drug administration in urgent situations such as convulsive seizures, hypertension and dysphasia. Oral strips of locust bean gum were formulated using solvent casting method containing metoprolol succinate as model drug. (T1- T9) placebo films were formulated initially using different concentrations of locust bean gum to assess the film forming ability of the locust bean gum. Crospovidone and PEG-200 were used as disintegrating agent and plasticizer respectively. Stability against moisture was improved by addition of beeswax. Formulated films (T1-T9) were evaluated for their appearance, film forming capacity, moisture permeability, weight variation and thickness. Placebo film formulations T4 and T6 consisting of locust bean gum (0.6 gm), beeswax (0.1 gm) and crospovidone (4%), 0.3 and 0.9 ml of PEG-200 respectively were selected for drug loading. Drug loaded films (F1 and F2) were characterised for parameters such as weight variation, film thickness, folding endurance, drug content uniformity, in vitro disintegration time, in vitro drug release, tensile strength and surface pH. Composition F2 comprising of locust bean gum (0.6 gm) and 0.9 ml of PEG- 200 was chosen as optimized formulation. Stability studies of optimized drug loaded formulation was done as per ICH guidelines of stability. Locust bean gum appears as a good alternative over the various synthetic polymers utilized in the formulation and development of oral strips/ films.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
187
192
https://ejchem.journals.ekb.eg/article_109398_59efc547885d907ef7ad2dd9e21329b5.pdf
dx.doi.org/10.21608/ejchem.2020.38329.2789
Heterogeneous Acid Catalyzed Synthesis and Spectroscopic Characterization of Schiff Bases Derived from Chalcone Derivatives
Olayinka
Ajani
Department of Chemistry, College of Science and Technology. Covenant University. Km 10, Idiroko Road, PMB 1023, Ota. Ogun State, Nigeria
author
Emmanuel
Jolayemi
Department of Chemistry, CST, Covenant University, Km 10, Idiroko Road, Ota, Ogun State, Nigeria
author
Fisayo
Owolabi
Department of Chemistry, CST, Covenant University. Km 10, Idiroko Road, Ota, Ogun State, Nigeria
author
Olayinka
Tolubolaji
Department of Chemistry, CST, Covenant University. Km 10, Idiroko Road, Ota, Ogun State, Nigeria
author
Oluwatosin
Audu
Department of Chemistry, University of Pretoria, South Africa
author
text
article
2021
eng
Schiff bases have continued to gain attention as essential building blocks and versatile pharmacophores in drug development and drug-like molecular entities. Thus, the synthesis of Schiff bases was achieved herein via facile acetic acid catalyzed synthetic transformation of chalcones. The targeted Schiff bases and related compounds 2a-m were accessed by the treatment of amines with chalcone 1 which was previously derived through Claisen-Schmidt reaction between benzaldehyde and acetone, at ambient temperature. Structural characterization was achieved via physicochemical properties and the use of IR, UV, 1H and 13C NMR which were spectroscopic techniques. The compounds have essential candidature for further study, in biological activity so as to unleash their medicinal potential.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
193
200
https://ejchem.journals.ekb.eg/article_104319_20a4574b18a104cc52ba680131c7a604.pdf
dx.doi.org/10.21608/ejchem.2020.20610.2233
Inhibition of Anabaena sp. and Oscillatoria sp. Using Probiotic Lactic Acid Bacteria
Marwa I.
Abd ElTawab
Center of Excellence for Research and Applied Studies for Climate and Sustainable Development (C3SD-NRC), Water Pollution Research Department, CEAS, National Research Center, Egypt
author
Fagr
Abdel Gawad
Center of Excellence for Research and Applied Studies for Climate and Sustainable Development (C3SD-NRC), Water Pollution Research Department, CEAS, National Research Center, Egypt
author
Ahmed M.
Shaban
Water Pollution Dep., Centre of Excellence for Advanced Sciences (CEAS), National Research Centre, Giza,
Egypt
author
Samah
Bassem
Center of Excellence for Research and Applied Studies for Climate and Sustainable Development (C3SD-NRC), Water Pollution Research Department, CEAS, National Research Center, Egypt
author
Giulia
Guerriero
Biology Department of, University of Napoli Federico II, Italy.
author
Hanan
Goda
Agricultural Microbiology Department., Faculty of Agriculture, Cairo University, Giza, Egypt
author
Aziz
Higazy
Agricultural Microbiology Department., Faculty of Agriculture, Cairo University, Giza, Egypt
author
text
article
2021
eng
Water blooms are a serious environmental problem affecting fresh and marine ecosystem. Application of probiotic bacteria has been introduced as an emerging and eco-friendly tool to regulate or inhibit cyanobacterial blooms. In the present study, we have isolated and morphologically identified cyanobacteria from El Manzala Lake. Afterward, we examined the use of probiotic lactic acid bacteria MT2 (Lactobacillus sakei) isolated from Nile Tilapia (Oreochromis niloticus) intestine in controlling Anabaena sp. and Oscillatoria sp., isolated from El Manzala Lake. Measuring chlorophyll, phycocyanin and biomass concentration were conducted in a co-culture experiment between the selected cyanobacterial isolates and probiotic lactic acid bacteria (MT2). Chlorophyll content, phycocyanin content and biomass concentration of Anabaena sp., and Oscillatoria sp., were decreased significantly in the co-culture experiment with MT2 bacteria. Also, the microscopic examinations showed that MT2 bacterium was able to lysis and degrade the selected cyanobacterial cells under microscope. We concluded that the use of MT2 (Lactobacillus sakei) is potentially effective against some cyanobacteria especially Anabaena sp. and Oscillatoria sp.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
201
210
https://ejchem.journals.ekb.eg/article_112482_5ffd93b3db1bb82c875316febdca5591.pdf
dx.doi.org/10.21608/ejchem.2020.41997.2848
Structure Investigation of Synthesized Novel Retinoid-Iodine Derivatives and Its Biological Applications
mohamed
Zayed
Department of chemistry, Faculty of Science, Cairo University (D.Sc. Anal.Chem.)
author
Marwa
Abdel Basset
Chemistry Department, Faculty of Science,Cairo University
author
text
article
2021
eng
The reactions between Tretinoin (Tret) and Isotretinoin (Itret) isomers with Iodine were thoroughly investigated under different conditions and solid products under proper conditions were prepared. Separation and identification of the formed products approved the stoichiometry (1:1). These newly prepared solid products were separated, washed, crystallized and structurally investigated and identified. Structures of the newly synthesized retinoid-iodine derivative products were carefully investigated in this research. Their structures were characterized, elucidated and analyzed by using the mass spectrometry (MS), Fourier Transform Infra-Red (FT-IR), 1H-NMR, thermal analyses (TA) and X- Ray Fluorescence (XRF). Then the results of the newly prepared compounds were compared with that of parent isomers analyses. Therefore; the proposed general formulae of the newly prepared compounds were found to be C20H27IO2. The biological activities of the newly obtained products in comparison with the parent isomers are thoroughly investigated against different kinds of bacteria and fungi.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
211
224
https://ejchem.journals.ekb.eg/article_109008_c0ea4cce4e26fad2db43d3291fd079fc.pdf
dx.doi.org/10.21608/ejchem.2020.33717.2706
The Use of Green Spectroscopy for Analysis of Quetiapine
Hala
Labib
Department of Pharmaceutical Chemistry, College of Pharmacy, Arab Academy for Science, Technology and Maritime Transport, Alexandria, Egypt
author
Hytham
Ahmed
Menoufia University
author
Yousef
Elshamy
Pharmaceutical Chemistry Department, Faculty of Pharmacy and Drug Manufacturing, Pharos University in Alexandria, Alexandria, Egypt
author
Wael
Talaat
Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Damanhour University, Damanhour 25511, Egypt
author
Tarek
Belal
Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, University of Alexandria, Alexandria 21521, Egypt
author
text
article
2021
eng
Three green (eco-friendly), inexpensive and simple spectrophotometric methods for quetiapine fumarate (QTF) analysis have been developed and validated. Method I was based on the measurement of the oxidation product of QTF at 610 nm. Potassium permanganate was used as oxidant. Method II was also relay on oxidation of the drug with ceric ammonium sulfate and the decrease in absorption intensity at 315 nm was measured. Method III involved complexation of the analyte with 2´,7´-bis (acetoxy mercury) fluorescein and quantitative analysis depended on determination of the reduction in absorption intensity of the used reagent at 502 nm. Different reaction conditions affecting intensity of measurement were carefully studied, optimized and validated. In all proposed methods, no need for extraction procedures and there were linear relationships between the absorbance readings and concentrations of QTF in the range of 5-35, 1-6 and 30-100 μg/mL with LOD values 1.11, 0.12 and 2.68 μg/mL for methods I, II and III respectively. The suggested methods were successfully applied to QTF analysis in pure form and in drug tablets.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
225
234
https://ejchem.journals.ekb.eg/article_110432_d8aefc5122bfab9c24dda2a801c51791.pdf
dx.doi.org/10.21608/ejchem.2020.37638.2774
Synthesis and Bioactivity Evaluation of Indole-Thiophene polymer with Molecular Docking Studies
Rasha A.
Baseer
NATIONAL RESEARCH CENTRE
author
Ahmed A.
Abd-Rabou
NATIONAL RES4EARCH CENTRE
author
Eman S.
Zarie
NATIONAL RESEARCH CENTRE
author
Rasha A.M
Azouz
NATIONAL RESEARCH CENTRE
author
Heba
Abo-Salem
Chemistry of Natural Compounds Department, National Research Centre, P.O. Box 12622 Dokki, Giza, Egypt
author
text
article
2021
eng
Emulsion polymerization of 2-amino-4-(1-benzyl-1H-indol-3-yl) thiophene-3-carbonitrile (ABITC) using ammonium persulfate (APS) as an oxidizing agent afforded two isomers of poly (2-amino-4-(1-benzyl-1H-indol-3-yl) thiophene-3-carbonitrile) (PABITC) with high molecular weight 35673 and 28596 g/mol. Chemical structure and morphology of the newly synthesized polymers were investigated by IR, 1HNMR, SEM, and GPC. Nano capsulation of ABITC, PABITC, and PABITC/Doxorubicin by polyethylene glycol (PEG) was achieved by the nano-precipitation method. The anti-proliferative activity of the newly synthesized PABITC and nano-capsulation against HepG2, Huh7, and A549 cancer cell lines were investigated using MTT assay. The result obtained indicates that the encapsulation of ABITC inside PEG-NP led to an improvement in their anti-proliferative activity against cancer cell lines compared to free ABITC. The free PABITC revealed moderate anti-proliferative activity against tested cells and their encapsulation form with PEG-NP revealed no significant change in the activity with the fold changed not exceed 1-time fold. Furthermore, the anti-proliferative activity of PABITC -NP was improved after Doxorubicin (DOX) encapsulation against tested cells compared to PABITC - PEG-NP. In addition, PABITC exhibited potent antibacterial activity against tested microbes comparing to monomer ABITC and the reference drug amikacin. Moreover, the binding mode of the monomer ABITC beside two repeated units of monomer inside the active site of the DNA gyrase B chain (PDB ID: 1KIJ) as promising bacterial target and CDK2 enzyme (PDB ID: 1PYE)] as promising cancer target was studied using molecular docking technique.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
235
251
https://ejchem.journals.ekb.eg/article_107314_e31ab2dcbe8ca3873b7989388a7942a6.pdf
dx.doi.org/10.21608/ejchem.2020.36373.2751
Molecular Imprinted-Polymer as a Controlled Release Material for Tramadol
Samir
Morsi
polymers and pigments dept. national research centre
author
Alian
N.A.
Chemistry Department, Faculty of Science (Girls), Al-Azhar University, Cairo, Egypt,
author
Naglaa
Abd-elFatah
Analytical Toxicology Laboratory, Forensic Medicine Authority, Ministry of Justice, Cairo, Egypt.
author
Morsi
Morsi
Glass Research Department, National Research Center, 33 El Bohoth St.,Dokki, Giza, Egypt.
author
Nihal
Shaker
Chemistry Department, Faculty of Science (Girls), Al-Azhar University, Cairo, Egypt,
author
text
article
2021
eng
The free-radical polymerization method was used to prepare crosslinked polymers as tramadol carriers for the controlled release process. The polymers were based mainly on ethylene glycol dimethacrylate (EGDMA) and methacrylic acid (MAA) in two different molar levels: 15 and 13. These two polymers represented the non-imprinted polymers (NIPs). Other corresponding polymers were prepared by adding tramadol hydrochloride during the synthesis that was removed at the end of the preparation process to produce tramadol-imprinted polymers (TIPs). The four polymers were loaded with tramadol for testing their in vitro release at various parameters such as soaking times, pH, and temperatures. The effect of molar ratio and imprinting process on tramadol release was studied. FTIR, TGA, and UV –absorption techniques were used to investigate the prepared and loaded polymers and the releasing process. More physical interactions were observed between the loaded tramadol and the matrix in TIPs than in NIPs. TIP with a molar ratio of crosslinker to polymer equals 13 demonstrated the highest control of releasing tramadol over 12-hour.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
253
262
https://ejchem.journals.ekb.eg/article_108120_d2be388495d4734e1c54bd0410968b51.pdf
dx.doi.org/10.21608/ejchem.2020.35500.2737
Numerical analysis of Phase Change Materials utilization for energy saving in Egyptian buildings
Hamdy
El Ghetany
Solar Dept, NRC
author
Wael
Aly
Professor of Mechanical Engineering
Faculty of Technology and Education
Helwan University
author
Hany
Shalata
Faculty of Technology and Education, Helwan University
author
Khaled
Abdelwahed
Department of Automotive Technology, Faculty of Technology and Education, Helwan University
author
text
article
2021
eng
The storage of thermal energy is one of the economic ways to achieve a rationalization of energy consumption in buildings and to ensure comfort conditions. The effect of using phase change materials on the room structure located in Egypt was studied using the PCM Express modeling and simulation program. The theoretical calculations were based on the PCM boards were impeded inside the walls. The study showed the importance of using phase change materials in the building structure compared to the traditional room due to the thermal efficiency of these materials and the storage and release of heat energy, which contributes to reducing thermal loads and good internal comfort conditions. Where five different cities were studied in Egypt (Cairo, Alexandria, Asyut, Aswan and Suez) and the study concluded that the city of Alexandria achieved the highest rise in energy saving by 2.59 kW/m3 day. The current study also demonstrated the effect of use of phase change materials with different thicknesses (5 mm, 10 mm and 15 mm). It is found that the thickness of 15 mm achieved higher energy saving by 2.34 kW/m3 day. Walls orientation (East, North, South, and West) were also studied, and it is found that the south wall higher energy saving by 1.92 kW/m3 day. Different PCM types was studied (Paraffin PCM, fatty acid PCM and hydrated salts PCM) and it is concluded that the higher energy saving was achieved by the values of 2.1 kW/m3 day, 1.7 kW/m3 day, 0.6 kW/m3 day for Paraffin PCM, fatty acid PCM, and hydrated salt PCM respectively. The conditions of internal comfort for the study rooms obtained the highest average increase in annual comfort temperature and energy saving by 38.9%
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
263
275
https://ejchem.journals.ekb.eg/article_105967_e80420c6f5a7765791dd6f07fd707825.pdf
dx.doi.org/10.21608/ejchem.2020.26471.2731
Hydrocarbon Simulation Behavior of Wet Natural Gas Reservoirs
eman
mansour
Egyptian Petroleum Research Institute
author
mohamed
El Aily
Egyptian Petroleum Research Institute
author
text
article
2021
eng
Knowing hydrocarbon dew point conditions in natural gas (HCDP) are becoming widely important in the modern marketing of liquid and gas. Without determination dew point conditions (Pressure & Temperature), the accurate description of phase changes and phase behavior cannot be achieved. Numerous models for only predicting dew point pressure of gas condensate have been proposed and other for wet natural gas reservoirs, but there is no model for predicting both dew point pressure(DPp) and dew point temperature (DPT) for wet natural gas reservoirs. Some of the published models assume knowledge the reservoir fluid composition (requiring laboratory experiments to be performed), while others only require field parameters such as reservoir temperature, stock-tank oil API, and the condensate-gas ratio (CGR). The primary objectives of this paper are to determine dew point temperature (DPT) and dew point pressure (DPp) correlations using a fluid database of nearly fifty-six wet natural gas reservoirs, that is very important for engineers to understand and manag wet natural gas reservoirs. This model was made using multiple least-square nonlinear regression analysis methods to find hydrocarbon dew point conditions (HCDP) as a function of [CGR, Tr, API gravity, γw, γC7+, MWw and C1, C2, CO2, N2 mole %] with a different constant value. Both statistical and graphical accuracy ensures that new models are more accurate in predicting hydrocarbon dew point conditions (HCDP) in comparison with equations of state by using limited data. Finally, thirty-four new separate set of measured data were used in testing models with the excellent agreement as compared with laboratory works.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
277
284
https://ejchem.journals.ekb.eg/article_106877_a11caf7fdfd3b9633dbcb010bb072464.pdf
dx.doi.org/10.21608/ejchem.2020.31506.2669
Natural Antioxidants: Preservation Roles and Mycotoxicological Safety of Food
Ahmed N.
Badr
Food Toxicology and Contaminants Dept., National Research Centre, Dokki 12622, Cairo, Egypt.
author
Mohamed
Youssef
Food Science and Technology Dept., Faculty of Agriculture, Alexandria University, Egypt.
author
Adel G.
Abdel-Razek
Fats and Oils Dept., National Research Centre, Dokki 12622, Cairo, Egypt.
author
Mohamed G.
Shehata
Food Technology Dept., the city of Scientific Research and Technological applications, Borg El -Arab, Alexandria, Egypt
author
Minar M.
Hassanien
Fats and Oils Dept., National Research Centre, Dokki 12622, Cairo, Egypt.
author
Hassan
Amra
Food Toxicology and Contaminants Dept., National Research Centre, Dokki 12622, Cairo, Egypt.
author
text
article
2021
eng
Natural antioxidants play a principal role in our life, as in body health, nutrition, food products, and recently in food preservation, it is one of the most effective materials. These components have a potential function for biochemical activities for either the plants, animals, or human tissues. Human foods and animal feeds often suffering of mycotoxins contamination. This action gives rise to oxidative stress in the biological systems. Several articles have been focusing on antioxidant roles avoiding food harmful like pathogens, toxigenic fungi, and mycotoxins. Recently, the investigations pointed out that minor components and phenolic antioxidants were capable of occurring a reduction in mycotoxin contamination. These components were obtained mainly from non-traditional oils in most cases. These oils have distinguished by better antioxidant potency. Antioxidants have the functionality to stop deleterious impacts of free radicals' presence that released in tissues and serum in food processing, antioxidant efficiency to suppress mycotoxin-hazard depends on its structure and its chemical activity In this regard, it could achieve preservation properties and shelf-life extension for the final product. In this review, the role of antioxidants will be discussed in two visions, firstly, the biochemical significance and its role in the body fluids and its protective function. Secondly, this review will cover the antioxidant capacity toward food manufacturing, and the preservation potency, particularly in oil application.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
285
298
https://ejchem.journals.ekb.eg/article_129167_36c61c3eb95d83e52ab4f0864c223f58.pdf
dx.doi.org/10.21608/ejchem.2020.51183.3048
Comparative Study of Vegetable Oils Oxidative Stability using DSC and Rancimat Methods
Rania
Almoselhy
Oils and Fats Research Department, Food Technology Research Institute,
Agricultural Research Center, Giza, Egypt
author
text
article
2021
eng
A comparative study was carried out to evaluate and compare the oxidative stability of vegetable oils (olive, corn and sunflower) in Egypt, through evaluation of accelerated oxidation at four different isothermal temperatures (110, 120, 130, 140 °C) using two different instruments: a differential scanning calorimeter (DSC) and a Rancimat instrument, taking into account the physicochemical quality characteristics and relationships between oxidative stability and fatty acid composition of oils. The Rancimat instrument was set at the four different isothermal temperatures with an air flow 20 L/h and measures the induction period (IP) of the selected oils. The differential scanning calorimetry (DSC) technique involved accelerated oxidation of oil samples in an air flow of 60 ml/min in DSC cell set at four different isothermal temperatures. A rapid increase in evolved heat was observed with the appearance of a sharp exothermic curve during initiation of the oxidation reaction. From the resulting exothermic curve, the onset of oxidation time (To) was determined graphically by the DSC instrument. There was an excellent correlation (p < 0.0001) found between DSC (T0) values and Rancimat (IP) measurements where the Pearson correlation coefficient (>0.98) between the two methods with coefficient of determination (R2 >0.89) for DSC independent of the vegetable oil source, imply that DSC can be recommended as an alternative appropriate objective method for assessing the oxidative stability of vegetable oils because of its simplicity, absence of toxic chemicals, small amount of sample and time-saving nature and could be easily used for routine analysis in oils and fats industry.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
299
312
https://ejchem.journals.ekb.eg/article_134825_047b5263d31e1c3092cac1c14acd530d.pdf
dx.doi.org/10.21608/ejchem.2021.51238.3051
Cloud point extraction and FAAS determination of copper(II) at trace level in environmental samples using N-benzamido-N'-benzoylthiocarbamide and CTAB
Magda
Akl
Professor of Analytical Chemistry, Faculty of Science, Mansoura University, Egypt
author
Ammar
AL-Rabasi
Chemistry Department, Faculty of Science, Mansoura University, Mansoura, Egypt
author
Ahmed
Molouk
chemistry department, faculty of science, Mansoura University, Egypt
author
text
article
2021
eng
The present work describes a simple method to detect copper(II) using flame atomic absorption spectrometry (FAAS) after pre-concentration and separation by cloud point extraction(CPE) using N-benzamido-N'-benzoylthiocarbamide (HBBTC) complexing agent and cetyltrimethylammonium bromide (CTAB) as a cationic surfactant. The different experimental parameters such as pH, the concentration of the reagent, centrifuging time, and concentration of CTAB and potassium iodide were examined to increase the extraction efficiency of the proposed procedure. Under optimized extraction conditions the limits of detection and limits of quantification were found to be 0.9 and 2.70 ng mL−1, respectively. The present work was successfully employed for the determination of copper(II) in synthetic mixtures and in water samples with a recovery% greater than 97% and RSD(%) = 0.18 %.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
313
322
https://ejchem.journals.ekb.eg/article_109396_bc09608eff694119563f118e521ea3ca.pdf
dx.doi.org/10.21608/ejchem.2020.36387.2752
Design, Synthesis, DFT Studies and Anticancer Activity of Novel Metal Complexes Containing 1,3,5-triazino[1,2-a]benzimidazole Moiety Using Microwave as an Approach for Green Chemistry
Ali
Hassan
Al Azhar University
author
Bassem
Heakal
Research Laboratory, Cairo Oil Refining Company, Mostorod, Qaliobia, Egypt
author
hamdy
Khamis
chemistry department, faculty of science, alazhar university
author
Gamal
Hassan
The city of Scientific Research and Technology Application, New Borg El-Arab Alexandria, Egypt.
author
Emad
Marzouk
Researcher chemist, Pwt International Company, Alexandria, Egypt.
author
Miral
Abdelmoaz
Pharmaceutical Chemistry Department, Faculty of pharmacy, Sinai University E-mail address
author
Ahmed
Younis
Green Chemistry Department
National Research Centre
author
text
article
2021
eng
2-(2-amino-4,10-dihydrobenzo[4,5]imidazo[1,2-a][1,3,5]triazin-4-yl)phenol (ligand) and its related metal complexes of Mn (II), Co (II), Ni (II), Cu (II) and Zn (II) were prepared under microwave irradiation. The structures of prepared compounds were elucidated in terms of elemental analysis, FT-IR, UV-Vis, 1HNMR, 13CNMR, EPR spectra and mass spectra in addition to magnetic studies at room temperature and thermal properties. Elemental analysis results determined mole ratios between the ligand and metal 1:1 or 1:2. The microwave approach provides clean, shorter reaction times and enhancements in yields. Coats Redfern and Horowitz Metzger equation were used to study Thermal kinetic parameters of dehydration and decomposition of the complexes. The geometries of the ligand and its Mn (II), Co (II), Cu (II) and Zn (II) complexes were optimized using Gaussian 09 W; density functional theory (DFT) B3LYP method. Also, the cytotoxic activity of the ligand and its metal complexes were evaluated against liver cancer cells (HepG-2) and the Cu (II) complex exhibited the highest cytotoxic activity with promising IC50 value = 3.5 µg/ml compared to standard reference cisplatin.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
323
340
https://ejchem.journals.ekb.eg/article_105968_8374a832847b3b40638992438b4ab722.pdf
dx.doi.org/10.21608/ejchem.2020.29618.2639
Eco-Friendly Secondary Metabolites from Conyza dioscoridis Against Spodoptera littoralis
Azza
Matloub
Department of Pharmacognosy, Pharmaceutical and Drug Industries Research Division,
National Research Centre, 33 Bohouth Street, Dokki, P.O. 12622, ID: 60014618, Cairo, Egypt.
author
Amal
Maamoun
Department of Pharmacognosy, Pharmaceutical and Drug Industries Research Division,
National Research Centre, 33 Bohouth Street, Dokki, P.O. 12622, ID: 60014618, Cairo, Egypt.
author
Nahed
Abdel-Aziz
Department of Pests and Plant Protection, Agricultural and Biological Division,
National Research Centre, 33 Bohouth Street, Dokki, P.O. 12622, ID: 60014618, Cairo, Egypt.
author
Elham
Samour
Department of Pests and Plant Protection, Agricultural and Biological Division,
National Research Centre, 33 Bohouth Street, Dokki, P.O. 12622, ID: 60014618, Cairo, Egypt.
author
Hanaa
El-Rafie
Department of Pharmacognosy, Pharmaceutical and Drug Industries Research Division,
National Research Centre, 33 Bohouth Street, Dokki, P.O. 12622, ID: 60014618, Cairo, Egypt.
author
text
article
2021
eng
Spodoptera littoralis (Boisd.), is one of the most dangerous pests in Egypt, targeting many economically crucial crops. In addition, population growth is major challenge to agricultural production. The aim of the current study is evaluation of insecticidal properties of chloroform/ methanol extract prepared from Conyza dioscoridis aerial part as well as study the biochemical changes on the 4thlarval instars of the cotton leaf worm, S. littoralis under laboratory conditions. Moreover, the bioactive secondary metabolites were isolated from the tested extract by chromatographic techniques and identified using spectroscopic analysis. Also, the volatile constituents distilled from Conyza dioscoridis aerial parts were characterized by GC/MS analysis. Column chromatography of bioactive chloroform/ methanol extract led to the identification of five major compounds including three triterpenes; β-amyrin-3-acetate, β-lupeol-3-acetate, β-amyrenone along with dotriacontane hydrocarbon as well as one methoxyflavone; 5,4ʹ-dihydroxy-6,7-dimethoxyflavone. Insight on insecticidal efficacy, the percentage of cumulative mortalities during pupal and adult stages reached to 76.6% and 83.3%, respectively after feeding 4thlarval instars of S. littoralis on tested extract with insecticidal activity in a dose-dependent manner. Whereas, β-amyrenone, lupeol acetate and 5,4ʹ-dihydroxy-6,7-dimethoxyflavone suppressed 50, 60 and 73.3% of 4th instar larvae of S. littoralis at concentration 0.3, 0.5 and 0.5%, respectively. Also, the extract showed marked decreasing in acetyl cholinesterase activity, total lipids and protein contents. The GC/MS analysis of volatile oil of C. dioscoridis aerial part led to the identification of 63 sensory metabolites that represent 93.68% of total volatile constituents. The oil was characterized by a high percentage of oxygenated sesquiterpenes (36.00%) and sesquiterpene hydrocarbons (21.09%), in addition phenylated and aliphatic hydrocarbons (15.43% and 14.58%, respectively). α-Cadinol was the major component (8.47%) accompanied by a high percentage of sesquiterpene alcohols. C. dioscoridis aerial part is a promising botanical pesticide with different mechanisms of action targeting 4th instars of larvae of S. littoralis. It had adverse effects survival, fecundity, oviposition, pupae and adults development and also acts as metabolic and acetylcholine esterase inhibitors against S. littoralis. So, the present findings may encourage more applied researches to evaluate crude extract and/or tested compounds in semi-field and field trial for controlling S. littoralis.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
341
357
https://ejchem.journals.ekb.eg/article_112479_fd41fe8db7e1e4f63f62832411091e17.pdf
dx.doi.org/10.21608/ejchem.2020.38753.2798
Fabrication of Novel (PMMA-Al2O3/Ag) Nanocomposites and its Structural and Optical Properties for Lightweight and Low Cost Electronics Applications
Angham
Hazim
University of Babylon, College of Science, Department of Physics, Iraq
author
Ahmed
Hashim
University of Babylon, College of Education for Pure Sciences, Department of Physics, Iraq
author
Hayder
Abduljalil
University of Babylon, College of Science, Department of Physics, Iraq
author
text
article
2021
eng
In this paper, preparation new type of nanocomposites may be considered as promising materials for different electronic and optical applications such as solar cells, sensors, electronics gates, transistors, lens, lasers ..etc . The nanocomposites were prepared with different concentrations of polymethylmethacrylate (PMMA), aluminum oxide (Al2O3) nanoparticles and of silver (Ag) nanoparticles are (PMMA0.98-(Al2O3)0.02)1-x/Agx where x=.0, 0.02, 0.04 and 0.06. The structural and optical properties of (PMMA-Al2O3-Ag) nanocomposites have been studied. The optical properties of nanocomposites were examined in wavelength range (220-820)nm. The results of optical properties for (PMMA-Al2O3-Ag) nanocomposites showed that the absorbance, absorption coefficient, extinction coefficient, refractive index, imaginary and real dielectric constants and optical conductivity of (PMMA-Al2O3) nanocomposites are increased with the increase in silver nanoparticles concentrations while the transmittance and energy band gap decrease with increase of the Ag nanoparticles concentrations. The results showed that the (PMMA-Al2O3-Ag) nanocomposites are promising for different optoelectronics applications.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
359
374
https://ejchem.journals.ekb.eg/article_95788_78948dd90b3a9b6f0207b505cf3e78e7.pdf
dx.doi.org/10.21608/ejchem.2019.18513.2144
Correlation Study for The Determination of pKa of A Number of Schiff Bases Derived from N-Formyl Pyridine using Quantum Mechanical Methods
Ra’ed T.Gh.
Al-Abady
Department of Chemistry, College of Education for Pure Sciences, University of Mosul, Iraq
author
Fedaa
Altaie
Department of Chemistry, College of Education for Pure Sciences, University of Mosul, Iraq
author
Emad
Al-Hyali
Department of Chemistry, College of Education for Pure Sciences, University of Mosul, Iraq
author
text
article
2021
eng
Statistical analysis employing multiparametric regression analysis was used to correlate the pKa values of 16 substituted Schiff bases (imines) derived from heterogeneous carbonyl compounds with various descriptors as parameters. These parameters are based on quantum mechanical methods. Four sets of parameters are used for these treatments. Two of them were derived depending on the semiempirical calculation represented by Austin method1 (AM1) and parameterized method3 (PM3) .. The other two sets were chosen as Ab initio models, expressed by Hartree fock (HF) and MP2 calculation models performed at 6.311G (d,p) level of theory. The descriptors employed to test their impact on the variation of the experimental pKa(s) are of two kinds, electronic and geometrical including atomic charges (Muliken and lowding), length of the imine (C=N) and connected bonds. Other molecular characteristic are also used such as energies of the HOMO and LUMO orbitals, total energies (TE), kinetic energy (KE), torsion, Vender Waals interactions of the 1,4 type (VDW 1,4) and non 1,4 type (Non 1,4 VDW). The correlation between the pKa values of the studied compounds and the selected parameters are investigated. Depending on the obtained results, several sets of parameters were constructed. The best set is indicated by the values of correlation coefficient (R2) and standard error (SE). Comparison are carried out between the experimental and calculated pKa obtained from AM1, PM3, MP2, and HF methods. Models of HF showed better consistency among the experimental and the calculated pKa(s) of the studied compounds. Hypothetical compounds of similar structures but with different substituents not included in the regression analysis are used to test the success of the derived equations. Good results are obtained.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
375
386
https://ejchem.journals.ekb.eg/article_109674_d607767e8bc339d8ce8ab241428c346f.pdf
dx.doi.org/10.21608/ejchem.2020.21125.2265
Separation of Cu (II) Ions by Hydroxamic Acid Functionalized Poly (Methyl Methacrylate) Grafted Cellophane Membranes
Gomaa
El fawal
Polymer Materials Research Department, Advanced Technology and New Materials Research Institute, Scientific Research and Technological Applications City, New Borg El-Arab City 21934, Alexandria, Egypt.
author
randa
khalifa
Polymer Materials Research Department, Advanced Technology and New Materials Research Institute, Scientific Research and Technological Applications City, New Borg El-Arab City 21934, Alexandria, Egypt.
author
Aref
Abdel Rahman
Nano and Composite Materials Research Department, Advanced Technology and New Materials Research Institute, SRTA-City, New Borg El-Arab City, 21934, Alexandria, Egypt.
author
Somaya
abdelrahman
Department of Chemistry, Faculty of Science, Zagazig University, Zagazig, Egypt.
author
Mohamed
Mohy Eldin Saad
Polymer Materials Research Department, Advanced Technology and New Materials Research Institute, Scientific Research and Technological Applications City, New Borg El-Arab City 21934, Alexandria, Egypt.
author
text
article
2021
eng
Hydroxamic acid functionalized Poly (methyl methacrylate) grafted cellophane ions exchanger membranes have been used for Cu (II) ions separation from synthetic metal solutions. Factors affecting the adsorption process namely copper ions concentration, adsorption time, adsorption temperature, and grafting percentage have been studied. It was found that the Cu+2 uptakes increase by increasing the grafting percentage. The maximum uptake amount of Cu+2 ions obtained with membranes of grafting percentage 58%. However, the recovery of the adsorbed Cu+2 ions has not been affected by variation of the grafting percentage. Equilibrium has been obtained after 60 minutes of adsorption while the temperature was found of neglectable effect. Fourier transforms infrared analysis and thermal gravimetric analysis provided evidences of the adsorption processes. Moreover, the kinetics and isotherms of the adsorption process have been monitored. The membranes show a very good applicability and reusability where very slow reduction of the adsorption and regeneration processes has been detected after ten cycles.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
387
395
https://ejchem.journals.ekb.eg/article_111539_318b570b29ec5668fd827028ed396f64.pdf
dx.doi.org/10.21608/ejchem.2020.35947.2742
Highly Sensitive Potentiometric Assay of Vardenafil in Pharmaceutical Formulations and Biological Fluids
Esmail
Gad
National Organization for Drug Control and Research (NODCAR), P.O. Box 29, Cairo, Egypt
author
hassan
Hendawy
National Organization for Drug Control and Research (NODCAR), P.O. Box 29, Cairo, Egypt
author
Marwa
Fouad
Pharmaceutical Chemistry Department, Faculty of Pharmacy, Cairo University, Kasr Eleini street, Cairo,
Egypt
author
Elmorsy
Khaled
Microanalysis Laboratory, Applied Organic Chemistry Department, National Research Centre, El Bohouth St.,
Dokki, 12622 Giza, Egypt
author
text
article
2021
eng
Sensitive disposable screen printed potentiometric vardenafil (VAR) sensors have been constructed based on multiwall carbon nanotubes/crown ether (MWCNTs/CE) composite. Factors affecting the sensor performance have been optimized on the basis of nature and content of the molecular recognition elements, anionic sites, membrane plasticizers and nanomaterial. The fabricated sensors showed acceptable selectivity and sensitivity within the vardenafil concentration range from 10-6 to 10-2 mol L-1 with Nernstian slope value of 62.1±0.8 mV decade-1 and detection limit 8.0 × 10-7 mol L-1. Fast response time, enhanced potential reading stability and long shelf lifetime are the promising futures of the novel sensors. The proposed method has been suggested for potentiometric assay of VAR in dosage formulation and biological fluids with average recoveries agreeable with the reported official methods.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
397
406
https://ejchem.journals.ekb.eg/article_112481_d359910fbb86d1960fed5a86eac66a69.pdf
dx.doi.org/10.21608/ejchem.2020.40411.2820
Computational Study on the Electronic Properties of Graphene/Calcium Oxide Nanocomposite
Amal
Al-Bagawi
Chemistry Department, Faculty of Science, University of Ha&rsquo;il, 1560, Hail, KSA
author
Eid E.
Salama
Chemistry Department, College of Science and Arts, Jouf University, Qurayyat, Kingdom of Saudi Arabia
author
text
article
2021
eng
Semiempirical PM6 quantum mechanical method was used to investigate the changes in the electronic and physical parameters of graphene before and after interaction with calcium oxide (CaO). Calculations were conducted the optimized structures with graphene interacting with two CaO molecules forming G/CaO nanocomposite once through the O atom then through the Ca atom, in the form of adsorb and complex states. Results indicated the deformation of graphene structure upon interaction with CaO but the resulting G/CaO is more thermally stable than graphene itself. The studied G/CaO composites were also found to be more reactive than graphene in regard to their higher calculated total dipole moments. The calculated thermal parameters further confirmed the thermal stability of G/CaO composites.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
407
412
https://ejchem.journals.ekb.eg/article_110431_32361dd64e55998a4b82b9fb2128463e.pdf
dx.doi.org/10.21608/ejchem.2020.37523.2771
Effect of Air Pollution on the Deterioration of El-Manial Palace and Museum for Greater Conservation of Egyptian Cultural Heritage
Asmaa
El-Mekawy
Air Pollution Research Department, National Research Centre, Giza, Egypt
author
abdel-hameed
Awad
Air Pollution Research Department, National Research Centre, Giza, Egypt
author
Alia
Shakour
Air Pollution Research Department, National Research Centre, Giza, Egypt
author
Inas
Saleh
Air Pollution Research Department, National Research Centre, Giza, Egypt
author
Yasser
Ibrahium
Air Pollution Research Department, National Research Centre, Giza, Egypt
author
Nasser
abdellatif
Air Pollution Research Department, National Research Centre, Giza, Egypt
author
Salwa
Hassan
Air Pollution Research Department, National Research Centre, Giza, Egypt
author
text
article
2021
eng
Ancient archaeological buildings are witness on human civilization and cultures. Saving and the conservation of cultural heritage is an urgent priority in Egypt and worldwide. ElManial palace and museum is one of the most important Egyptian ancient archaeological buildings and has great historical and cultural value due to the presence of personal valuable property and memorabilia of Prince Mohammed Ali Tewfik objects which reflecting the settings and lifestyle of the late 19th and early 20th century Egyptian royal prince and heir apparent. Unfortunately the palace is situated in very crowded and polluted place, so thus study was done for measuring the effect of pollutants on the palace and monuments collections on it. RH%, temperature, particulate matter (PM) and its ionic species and gaseous air pollutants (sulphur dioxide, nitrogen dioxide, ammonia, hydrogen sulfide and formaldehyde) were measured inside and outside the museum. The annual mean concentration of SPM in outdoor and reception hall exceeded both national and international limits. A/C ratios for all locations were greater than one, indicating that SPM were in acidic state, which had hazard effect on the palace and its heritage constituents. HCHO and NH3 gases were high compared to other studies. SO2 and NO2 gases were more than international limits which form a critical danger on the palace.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
413
423
https://ejchem.journals.ekb.eg/article_124240_6d1b9133081381b276d6339d2058c818.pdf
dx.doi.org/10.21608/ejchem.2020.34881.2755
Binding Energy and Photostability of the β-cyclodextrin Encapsulates of Lornoxicam and Tenoxicam drugs:A combined Experimental and Theoretical Study
Eman
Youssof
Drug Bioavailability Center, National Organization for Drug Control and Research (NODCAR), P.O. Box 29
Cairo, Egypt.
author
Marwa
Tammam
Drug Bioavailability Center, National Organization for Drug Control and Research (NODCAR), P.O. Box 29
Cairo, Egypt.
author
Yousra
Abdel-Mottaleb
Department of Pharmacology, Toxicology, and Biochemistry, Faculty of Pharmaceutical Sciences and
Pharmaceutical industries, Future University in Egypt (FUE), Cairo 11835, Egypt.
author
Mohamed Sabry
Abdel-Mottaleb
Nano-Photochemistry, Solar Chemistry and Computational Chemistry Labs, Department of Chemistry, Faculty
of Science, Ain Shams University, Abbassia, Cairo 11566, Egypt.
author
text
article
2021
eng
The lornoxicam (LRX) and tenoxicam (TNX) drugs form a stable 1:1 inclusion complex with b-cyclodextrin (β-CD) in aqueous solution. The experimentally determined association constants (K) of LRX- β-CD and TNX- β-CD are 13.4 and 10.3 M-1, respectively. Quantum chemical computations simulated the preferred orientation of guest molecules in the host. Geometry optimized results using the ONIOM technique provided more in-depth insights and identified the structure and showed that both drugs were partially encapsulated within the β-CD cavity. The calculated inclusion binding energy (BE, kcal mol-1) reveals the noticeable thermal stability of LRX-β-CD (-24.19 kcal/mol) over the TNX-β-CD (-13.45 kcal/mol) capsulate. Furthermore, the photostabilities of the encapsulated drugs were tested. Drug encapsulation did not result in any additional photostability. Moreover, encapsulation of the drugs in the β-CD resulted in noticeable changes in the electronic characteristics of the drugs, as reflected in their reactivity indices. The fact that the water-soluble β-CD formed inclusion complexes with water-insoluble LRX and TNX enables the drug delivery vehicle for oral administration.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
425
430
https://ejchem.journals.ekb.eg/article_106881_2db9d387ebd0266361cd02bbb8390403.pdf
dx.doi.org/10.21608/ejchem.2020.37000.2765
Adjuvent Effect of Melatonin Premedication on Propofol Induction Dose
Eman
Mohamed
Anesthesia, Intensive Care and Pain Management department, Faculty of Medicine for Girls AL-Azhar University
author
Nagia
Abdelmoeti
Anesthesia, Intensive Care and Pain Management department, Faculty of Medicine for Girls AL-Azhar University
author
Sawsan
Mohamed
Anesthesia, Intensive Care and Pain Management department, Faculty of Medicine for Girls AL-Azhar University
author
text
article
2021
eng
This study investigated the role of melatonin different doses as a premedication in decreasing the induction dose of propofol for anesthesia, preoperative anxiety, pain and sedation after abdominal surgery. This study was conducted on 60 patients scheduled for elective abdominal surgery under general anesthesia. The sixty patients included in this study were randomly divided into three equal groups(n=20)for each group: Control (C Group), melatonin 3mg (M3 Group) were received 3mg oral melatonin 100 min preoperative and melatonin 5mg (M5 Group) were received 5mg oral melatonin 100 min preoperative. The results revealed that mean induction dose of propofol was significantly higher in group C than in M3, M5 groups .Although the dose of propofol that result in loss of response to verbal commands and loss of eye lash reflex. VAS anxiety score preoperative and VAS pain score postoperative were statistically significant higher in C group than both melatonin groups. Time taken before the first dose of analgesia was significantly higher in both melatonin group than the control group.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
431
436
https://ejchem.journals.ekb.eg/article_111541_3b7d1ad256b24e9f64799ca6c80c06da.pdf
dx.doi.org/10.21608/ejchem.2020.42023.2844
Chemical Composition and Antimicrobial Activity of Volatile Constituents of Cladodes, Fruits peel and Fruits pulp from Opuntia ficus indica (L.) Mill. (Prickly Pear) growing in Egypt.
S.S.
El-hawary
Department of Pharmacognosy, Faculty of Pharmacy, Cairo University 11562, Egypt.
author
M.E.
El-Tantawy
Department of Medicinal Plants and Natural Products, National Organization for Drug Control and Research, Egypt.
author
M.A.
Rabeh
Department of Pharmacognosy, Faculty of Pharmacy, Cairo University 11562, Egypt.
author
W.K.
Badr
Department of Medicinal Plants and Natural Products, National Organization for Drug Control and Research, Egypt.
author
text
article
2021
eng
Volatile constituents of Opuntia ficus indica (L.) Mill (prickly pear or nopal cactus) cladodes, fruits peel and fruits pulp were prepared by hydrodistillation. The chemical composition was investigated by GC/MS analysis. Dodecane found as the major compound in the volatile constituents of fruits peel and cladodes representing (32.3%) and (20.05%) respectively followed by undecane (20.02%) in cladodes, (14.47%) in fruits peel while the fruits pulp volatile constituents contain undecane as a major compound (20.52%) followed by dodecane (16.86%). The antimicrobial activity was carried out for all samples using diffusion agar method against Aspergillus flavus, Candida albicans, Staphylococcus aureus, Bacillus subtillis, Escherichia coli, Salmonella typhimurium. Fruits peel volatile constituents showed antimicrobial activity against all tested microorganisms except Candida albicans while fruits pulp volatile constituents showed activity against Staphylococcus aureus and gram-negative bacteria and had no activity against fungi and Bacillus subtillis. Cladodes volatile constituents had no activity against all tested microorganisms.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
437
444
https://ejchem.journals.ekb.eg/article_84135_2c837ee85ed4ba972d570c2870bcfc1d.pdf
dx.doi.org/10.21608/ejchem.2020.21137.2260
Enhancement of wool fabric dyeing via treatment with AgNPs
Hayam
Ahmed
Chemistry Department, Faculty of Science, Al-Azhar University, Cairo, Egypt
author
Asrar
Elsayed
Faculty of Science, Al-Azhar University (Girls)
author
text
article
2021
eng
Nanoparticles are a successful material for fibers and textiles functionality. In this work, silver nanoparticles (AgNPs) were synthesized by the chemical reduction of Ag+ and then the AgNPs were investigated by UV–visible (UV–vis) spectrophotometer, transmission electron microscopy (TEM), scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). The synthesized nanoparticles were used for the surface improvement of the fabric, and the fabric was then dyed with C.I. Acid Red 18 (AR 18) at different temperatures. The physical properties, tensile strength, wrinkle rate, color strength, and colorfastness to perspiration of wool fabric were studied in dyed wool and raw wool fabric. It was found that the nanoparticle-treated fiber was stronger than untreated yarn. The corresponding rate of adsorption was analyzed and calculated according to different kinetic models. Furthermore, diffusion coefficients, the activation energy, and thermodynamic parameters were calculated. Treatment with AgNPs produces a wool fabric with excellent color fastness and antibacterial properties enables enhanced health care and reduced environmental impacts.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
445
460
https://ejchem.journals.ekb.eg/article_126521_e89ee224623ab2afa2548efa2e4db97e.pdf
dx.doi.org/10.21608/ejchem.2020.47516.2968
Charge transfer complexes of atenololdrug with some dihydrxyanthraquinone and dihydroxybenzoquinone derivatives:Molecular structures, spectral, and quantitative studies.
Reem
Alghanmi
Department of chemistry, college of science, university of Jadda, Jedda, Saudi Arabia
author
text
article
2021
eng
Atenolol (ATN) is -blocker medication widely used in the clinic to treat hypertension. In this study, complexation of ATN with three different acceptors, namely alizarin (AZ), alizarin red S (AZR), and 2,5-dihydroxy-p-benzoquinone (DHBQ) was investigated spectrophotometrically. It was found that ATN formed charge transfer (CT) complexes with AZ, AZR, and DHBQ in MeOH. The CT reaction conditions between ATN and each acceptor were comprehensively investigated. Moreover, the formation constants and other related spectrophysical parameters were determined. The stoichiometry of 1:1 ratio was established for all studied complexes in MeOH using different methods. The optical band gap (Eg), which corresponds to the minimum energy required for the transition, was calculated by the optical absorption method. The values of Eg were found to be 2.02, 2.07, and 2.25 eV for the [ATN-AZ], [ATN-AZR], and [ATN-DHBQ] complexes, respectively. Solid complexes of ATN with these acceptors were effectively prepared and isolated. New bands in the FTIR spectra of the complexes were detected as a result of complexation. Additionally, the appearance of signals corresponding to the reactants in 1H NMR spectra of the products confirmed the formation of ATN complexes. In addition to the CT reactions between ATN and each acceptor, both FTIR and 1H NMR analyses suggested the existence of proton transfer reactions. Based on the fast complexation of ATN with the studied acceptors in MeOH, three direct, simple, and sensitive spectrophotometric methods were developed for the quantitative determination of ATN in its pure form and in pharmaceutical formulations. Validation studies confirmed the remarkable accuracy and precision of the developed methods without any interference from tablet excipients.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
461
477
https://ejchem.journals.ekb.eg/article_107313_abc9e0abab70d3e2b8be9d3ae727d46b.pdf
dx.doi.org/10.21608/ejchem.2020.35280.2734
Formation of Carbazole in ɤ- irradiated Aniline / Chlorobenzene mixtures
Kh.
Sife-eldeen
Radiation Chemistry Department, National Centre for Radiation Research and Technology (NCRRT), Atomic
Energy Authority, P. O. Box 29, Nasr City, Cairo, Egypt
author
text
article
2021
eng
In this study, Gas chromatographic/mass spectrometric study indicated that carbazole (CARB) is formed in oxygen free ɤ- irradiation of aniline / chlorobenzene mixtures. It seems that ɤ-radiation induces the formation of CARB in these mixtures via intramolecular dehydrocyclization of diphenylamine (DPA). The yield of CARB estimated via gas chromatography (GC), was found to be dependent on aniline – chlorobenzene molar ratio. Where, the maximum CARB yield was found at 1:1 molar ratio of aniline – chlorobenzene. At this reactants molar ratio, the effect of absorbed radiation dose and dose rate on the yield of carbazole was studied. The yield of CARB increases, linearly, as the absorbed dose is increased up to about 50 kGy. The G-value (5.8μM/J) of CARB was determined. It was found that, the yield of CARB increase as the absorbed dose rate increases (0.226 -0.904kGy/h). So, it can be concluded that CARB is formed, mainly, in the spurs. The mechanism of the CARB formation was discussed.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
479
485
https://ejchem.journals.ekb.eg/article_108065_1d32feb1e32bd2a1f199504accfe321c.pdf
dx.doi.org/10.21608/ejchem.2020.22653.2346
Microstructure and Dielectric Properties of Polyaniline Doped with Copper Nanoparticles
Juman
Naser
Department of Chemistry, College of Education for Pure Science- Ibn Al-Haitham, University of Baghdad, Iraq (Baghdad)
author
Zainab
Ahmed
Department of Chemistry, College of Education for Pure Science- Ibn Al-Haitham, University of Baghdad, Iraq (Baghdad)
author
Wedad
Fendi
Department of Chemistry, College of Education for Pure Science- Ibn Al-Haitham, University of Baghdad, Iraq (Baghdad)
author
text
article
2021
eng
Polyaniline (PANI) has been prepared by the oxidation method in order to fabricate it with various concentrations of copper nanoparticles (CuNPs) which produced using the reduction method. Various techniques have characterized pure PANI and PANI doped CuNPs composites, such as fourier transform infrared spectroscopy (FT-IR), X-ray diffraction spectroscopy (XRD), field emission scanning electron microscopy (FE-SEM) and energy dispersive X-ray spectroscopy (EDS), which were provided important information about the structure and morphology of the fabricated polymer nanocomposites. The properties of dielectric permittivity (έ), dielectric loss (ἔ) and electrical conductivity (σ_AC) properties were studied at room temperature versus a range of frequency (15-150) kHz. The results demonstrated that the addition of copper nanoparticles to polyaniline matrix increases the dielectric permittivity property and it decreases with increasing the frequency to reach a fixed value. So, the electrical conductivity of studied samples decrease with increasing the frequency.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
487
494
https://ejchem.journals.ekb.eg/article_128400_fb353ddb94bdd220388c9a2cd88affc5.pdf
dx.doi.org/10.21608/ejchem.2020.38507.2793
Using Composite Nanofibers to Remove Microorganisms from Aqueous Solutions
Ahmed K.
Suleiman
Department of Applied Chemistry, Faculty of Sciences, Helwan University, Cairo, Egypt
author
Omnia I.
Aly
Department of Applied Chemistry, Faculty of Sciences, Helwan University, Cairo, Egypt
author
Elsayed M.
Mahdi
Department of Applied Chemistry, Faculty of Sciences, Helwan University, Cairo, Egypt
author
Alaa
Mohamed
Department of Mechatronics, Canadian International College, Fifth Settlement, New Cairo, Egypt
author
Gehad G.
Mohamed
Chemistry Department, Faculty of Sciences, Cairo University, Giza, 12613, Egypt
author
text
article
2021
eng
The provision of safe drinking water has been one of humanity’s most successful public health interventions and is a defining aspect of a devel+oped country. However, ignorance of the potential risks, inappropriate training of staff and managers working on drinking water systems still results in unnecessary waterborne disease outbreaks in affluent communities. Microorganisms present in drinking water sources such as bacteria have been targeted with the aim of limiting their growth as well as eliminating them. A chemical contains a mixture of chitosan, polyvinyl alcohol, nanomagnetic iron oxide, as well as nanocarbon were used. This chemical obtained in the form of nanofibers by the electric spinning process, where the properties of this substance and its shape studied using the scanning electronic microscope (SEM) as well as the transmission electronic microscope (TEM), the type and shape of bacteria. This paper aims to show the bacteria effects on the public health, clearfy their shape and type, as well as stopping and eliminating the bacterial growth
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
495
502
https://ejchem.journals.ekb.eg/article_108066_34ae55eee51ee8659addc2befc99f823.pdf
dx.doi.org/10.21608/ejchem.2020.22693.2351
Retanning agent for chrome tanned leather based on modern technique of emulsion polymers
Farouk
Abd El-Monem
Chemistry Department, Faculty of Science Alazhar University
author
Ahmed I.
Hussen
Polymers and Pigments Dept. National Research Centre, Dokki, Cairo, Egypt.
author
H.
Abd El-Wahab
Chemistry Department, Faculty of Science Alazhar University
author
EL-Shahat H.A.
Nashy
Chemistry of Tanning Materials and Leather Technology Dept. National Research
Centre, Dokki, Cairo, Egypt.
author
A. M.
Naser
Chemistry Department, Faculty of Science Alazhar University
author
text
article
2021
eng
Retanning process aims at filling up of the meatuses of the already tanned leather through the incorporation of vegetable or synthetic tannins or polymer (resins) with the aim of giving more fullness and improving to the final product. In this research, poly(methyl methacrylate-co-butyl acrylate) emulsion was prepared in situ with nano-silica in order to be used as a modern retanning agent of chrome tanned leather to totally replace chrome salt and to enhance physical, thermal shrinkage, and mechanical properties of the final tanned leather as well as to reduce the environmental impact of chrome tanning effluent. Polymer/nano-silica hybrid emulsions were prepared via in situ seed emulsion polymerisation. The prepared polymers were characterised for solid content, molecular weight, viscosity, drying time, minimum film-forming temperature (MFFT) and microstructures (via TEM). The mechanical, shrinkage, thermal and surface morphological (by SEM) properties of the treated samples were also investigated. The influence of the increase in the content of organic nano-silica on the properties of the retanned leather were also discussed.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
503
516
https://ejchem.journals.ekb.eg/article_97548_9e14e4e2ee1d45c3c816186e754ad523.pdf
dx.doi.org/10.21608/ejchem.2020.29577.2636
Synthesis and Preliminary Pharmaceutical Evaluation of New Polymeric Prodrug of Levofloxacin as a Drug Delivery System
Lamiaa
Saleh
Department of pharmaceutical chemistry, University of Basrah/ College of Pharmacy, Basra, Iraq
author
Raheem
Jameel
Department of pharmaceutical chemistry, College of Pharmacy, University of Basrah, Iraq
author
Mohammed
Al-Lami
Department of pharmaceutical science, College of Pharmacy, University of Basrah, Iraq
author
Rana
Abdulnabi
Department of clinical laboratory sciences, College of Pharmacy, University of Basrah, Iraq
author
text
article
2021
eng
In this work, a new polymeric prodrug was successfully synthesized by Fischer-esterification between chitosan as biodegradable polymer and levofloxacin as drug material. Levofloxacin was linked directly to the chitosan through a degradable ester bond at (chitosan: levofloxacin) ratios of (1:1), (1:2), and (2:1). The resulting product was characterized by Fourier transform infrared spectroscopy, ultraviolet spectroscopy, thermogravimetric analysis, and differential scanning calorimetry to confirm its structure. Furthermore, the physical properties of the product were determined. The polymer–drug conjugate was evaluated for its drug content and in vitro drug release at pH 1.2 at a condition similar to physiological conditions. Profile of the in vitro drug release showed that levofloxacin was released in a sustained manner from pro(1:2). A high swelling index for pro(1:2) confirmed this finding. Therefore, the ester bond hydrolyzed in acidic media to release the drug. Antibacterial assay was conducted for synthesized prodrug against Pseudomonas aeruginosa, Escherichia coli, and Staphylococcus aureus species. The polymeric prodrug could be used successfully as a controlled drug delivery system.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
517
524
https://ejchem.journals.ekb.eg/article_109009_2141b5efa480005db148f9f819c623af.pdf
dx.doi.org/10.21608/ejchem.2020.34131.2720
Removal of Chromium (VI) from Aqueous Solutions Using Composite Nanofibers
Ahmed K.
Suleiman
Department of Applied Chemistry, Faculty of Sciences, Helwan University, Cairo, Egypt
author
Omnia I.
Aly
Department of Applied Chemistry, Faculty of Sciences, Helwan University, Cairo, Egypt
author
Elsayed M.
Mahdi
Department of Applied Chemistry, Faculty of Sciences, Helwan University, Cairo, Egypt
author
Gehad G.
Mohamed
Chemistry Department, Faculty of Sciences, Cairo University, Giza, 12613, Egypt
author
Alaa
Mohamed
Department of Mechatronics, Canadian International College, Fifth Settlement, New Cairo, Egypt.
author
text
article
2021
eng
Chromium is a natural metal, commonly found in wastewaters, which is originated from several industrial processes such as electroplating industries, military purposes, textile dyeing, paint, leather tanneries, and pigment industries as critical industry materials. Chromium possesses two oxidation states Cr(VI) and Cr(III). Cr(VI) is highly toxic, carcinogenic, mutagenic to most of the living organisms when its concentration level is higher than 0.05 ppm, and extremely mobile than Cr(III). Therefore, there is a great importance to remove Cr(VI) from aqueous solution, to prevent the deleterious impact of the Cr(VI) on the human health. This paper propose a method that aims to remove Cr(VI) from water by campsite nanofiber.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
525
531
https://ejchem.journals.ekb.eg/article_108067_27b90c1a47701c50a75504bbc48f3a15.pdf
dx.doi.org/10.21608/ejchem.2020.22929.2361
Porous Polyvinyl Formaldehyde / MWCNTs Foam for Pb+2 Removal from Water
Mohammed
yosef
Chemistry Department, Faculty of Science, Al Azhar University, 11884 Cairo, Egypt
author
Alaa
Fahmy
Chemistry Department, Faculty of Science, Al Azhar University, 11884 Cairo, Egypt
author
Ali
hassan
Chemistry Department, Faculty of Science, Al Azhar University, 11884 Cairo, Egypt
author
Walid
El hotaby
Spectroscopy Department., Physics Division., National Research Centre, Dokki, Giza, Egypt
author
Badawi
Anis
Spectroscopy Department., Physics Division., National Research Centre, Dokki, Giza, Egypt
author
text
article
2021
eng
Preparation of macro-porous polyvinyl formaldehyde / multi-walled carbon nanotubes (PVF/MWCNTs) foam was done via one step reaction during acetalization of polyvinyl alcohol (PVA). The as-prepared PVF/MWCNTs composite was used as an eco-friendly, easy recovery sorbets for Pb (II) from aqueous medium. Fourier transform infrared (FTIR), and high-resolution scanning electron microscopy (HRSEM) were used to investigate the chemical composition and morphological structure of the prepared foam. The results showed that equilibrium occurred within 60 min at pH≈ 5 with a maximum adsorption capacity 3.4 mg/g with 43 % removal (considering the total weight of composite). In addition, the kinetic results are most fitted with pseudo-second-order model indicating that the reaction mechanism is chemisorption in nature. Therefore, it is suggested that the prepared PVF/MWCNTs foam can be used in water treatment systems as an eco-friendly and efficiency sorbent.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
64
v.
1
no.
2021
533
545
https://ejchem.journals.ekb.eg/article_108069_18eb83dcb4dd5a4c8f7681e73675d7d7.pdf
dx.doi.org/10.21608/ejchem.2020.34453.2733