@article { author = {Hebash, Ali and Abdelrahman, Amal and Nassar, Sahar and Elsayad, Hanan and Elshemy, Nagla}, title = {Microstructural Features of Galactomannan Fenugreek Gum Newly Oxidized by Sodium Perborate under Microwave Irradiation for Reactive Printing}, journal = {Egyptian Journal of Chemistry}, volume = {62}, number = {11}, pages = {1971-1986}, year = {2019}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2019.5236.1466}, abstract = {Galactomannan gum was extracted from fenugreek seeds through seed grinding and sifting, washing and filtering and precipitating by ethyl alcohol and drying. Thus obtained products were submitted to innovative oxidation using microwave irradiation and sodium perborate (SPB) oxidant under a variety of conditions. Variable studied include concentration of SPB and duration of oxidation as well as pH and temperature of the oxidation reaction. Thus oxidized gum samples were subjected to chemical and chemical-microscopically analysis for quantitative determination of carboxyl and carbonyl groups and rheological properties along wilts residual SPB. Microstructural changes in the innovatively oxidized gum vis-à-vis those of conventionally oxidized gum were presented. Results indicate that the innovative oxidation using the microwave for heating the oxidation medium containing SPB consumes less time and energy than the conventional oxidation by SPB using conventional heating. Results indicate further that current oxidation using the microwave or conventional heating brings into focus oxidized galactomannan gums, which induce excellent overall color fastness when applied as thickeners in printing pastes of reactive dyes. These gums may be considered as a real substitute for sodium alginate thickener which is universally accepted thickeners for reactive printing on cotton. In addition, oxidized galactomannan gum creates eco- friendly environment during its preparation.}, keywords = {Keywords: Textile Printing,Color,dyeing,Chemical modification,properties}, url = {https://ejchem.journals.ekb.eg/article_44758.html}, eprint = {https://ejchem.journals.ekb.eg/article_44758_f86f2149650856911ea234a208103dad.pdf} } @article { author = {Zahran, Magdy and Saleeb, Maher and Elhalawany, Noha}, title = {Electrical and Dielectrical Properties of Some Novel Polyaniline Nanocomposites}, journal = {Egyptian Journal of Chemistry}, volume = {62}, number = {11}, pages = {1987-1994}, year = {2019}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2018.6498.1548}, abstract = {Novel polyaniline/silver (PANI/Ag) and polyaniline/silver/cupper (PANI/Ag/Cu) core–shell nanocomposites have been successfully prepared. The morphology and the structure of the prepared nanocomposites have been characterized and elucidated. The AC conductivity measurements in the frequency range from 1MHz to 1GHz at different temperatures for the prepared nanocomposites have been investigated. The results showed very high conductivities and dielectric constants. The ac conductivities of the prepared nanocomposites are frequency dependent and follow up hopping conduction mechanism in general. The enhanced electrical properties of the prepared nanocomposites may be attributed to the superior core shell structure and the presence of the core Ag, Ag/Co and Ag/Cu nanoparticles.}, keywords = {Polyaniline nanocoposites,core-shell nanocomposites and Ac-conductivity}, url = {https://ejchem.journals.ekb.eg/article_23039.html}, eprint = {https://ejchem.journals.ekb.eg/article_23039_15a21a42f4618e725516f41da44a37c3.pdf} } @article { author = {Fathy, Nady and Amr, Ahmed and Abdelmoaty, Alaa S. and Okeil, Ashraf and Hanna, Adly}, title = {Retarding the Flammability of Polypropylene Based on the Synergistic Effect of Montmorillonite and Carbon Nanotubes}, journal = {Egyptian Journal of Chemistry}, volume = {62}, number = {11}, pages = {1995-2001}, year = {2019}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2019.11992.1754}, abstract = {The aim of this work is to reduce the flammability of polypropylene (PP) materials which are plenty used in a variety of industrial applications. For the first time, the efficiency of eco-friendly and low-cost flame retardant of CNTs prepared from rice straw on the flammability degree of PP/MMt composite is reported in this study. Mixtures of polypropylene/ montmorillonite /carbon nanotubes (PP/MMt/CNTs) were prepared by using different percentages of MMt and CNTs. The used CNTs sample was prepared from rice straw waste and the MMt was collected from Wadi El Hamadia, Egypt. The prepared samples were characterized by using Fourier transform infrared (FTIR) spectroscopy and scanning electron microscope (SEM), while the flammability properties were measured by using Limiting Oxygen Index (LOI). The results of FTIR and the photos of SEM showed that the MMt/CNTs composition is incorporated into the PP matrix. The LOI test revealed that LOI value of PP increased from 18.8% to 21.5 % in presence of MMt particles while the addition of 0.05 and 0.1 % of CNTs to PP/MMt significantly improved the LOI value to become 22.4 and 23.5%, respectively. This finding indicates that the addition of CNTs as co-nanofiller can improve the flame retardancy of PP/MMt composites. Thus the obtained MMt/CNTs composites act as synergist fillers to offer admirable and fire safe PP products.}, keywords = {polypropylene,flammability,montmorillonite,carbon nanotubes,rice straw waste}, url = {https://ejchem.journals.ekb.eg/article_31731.html}, eprint = {https://ejchem.journals.ekb.eg/article_31731_54f1ae25dc062d37577c05c9ebb83dcd.pdf} } @article { author = {Abdel Bary, E. and Farag, Reem and A., Ragab and Abdel-monem, Ramy and Abo-Shanab, Z. and M. Saleh, A.}, title = {Colloidal Stability and Dynamic Mechanical Properties of Asphalt Modified with Unsaturated Polyester Prepared from Waste Polyethylene Terephthalate}, journal = {Egyptian Journal of Chemistry}, volume = {62}, number = {11}, pages = {2003-2017}, year = {2019}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2019.7451.1601}, abstract = {This research aims to prepare unsaturated polyesters (UP) from polyethylene terephthalate waste (WPET) and studying their effects on the colloidal stability and dynamic mechanical properties of the prepared modified asphalt samples. To achieve this aim WPET is chemically recycled through glycolysis reaction using different glycols namely, diethylene glycol (DEG), triethylene glycol (TEG) and propylene glycol(PG) at molar ratios of PET wastes/glycol; 1:1.2 separately. The glycolyzed products were converted into unsaturated polyester (UP) via reaction with maleic anhydride. The prepared unsaturated polyesters (UPd, UPt and UPpg) were characterized using FTIR, GPC and TGA and then added to asphalt 60/70 in percentages ranging from 2wt% to 8wt% using wet process to prepare modified asphalt binder with desirable physical and engineering properties. The prepared modified asphalt samples were evaluated for thermal stability using TGA, physical and chemical properties using conventional tests, colloidal stability index while their rheological properties were investigated using Superpave binder tester, namely, dynamic shear rheometer (DSR) to determine the rutting and stiffness resistance of the prepared samples. The results showed an improvement in asphalt properties which became more thermally, colloidally stable and resistant to rutting and plastic deformation.}, keywords = {Asphalt,Waste PET,Glycolysis,Rutting parameter,Wet process}, url = {https://ejchem.journals.ekb.eg/article_31338.html}, eprint = {https://ejchem.journals.ekb.eg/article_31338_1156765bed9b41a8170b8ca89054cbbd.pdf} } @article { author = {Nasr, Fayza and Sadik, Mervat and El-Shafai, Saber}, title = {Innovative Electrochemical Treatment of Textile Dye Wastewater}, journal = {Egyptian Journal of Chemistry}, volume = {62}, number = {11}, pages = {2019-2032}, year = {2019}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2019.10576.1683}, abstract = {The application of electrocoagulation (EC) for removal of Chemical Oxygen Demand (COD) and color from textile wastewater is the aim of this research. Batch wise experiments were carried out using iron electrodes to investigate effect of pH, current density and electrolysis time on percentage removals. Results show maximum removal efficiency of COD (65%) and color (97%) at 0.9 A and 0.4 A, respectively at 1.6 V and 120 minutes reaction time. Moreover, the results show that the COD removal is influenced by the pH with maximum removal at pH 8.The EC process improves wastewater biodegradability with increasing BOD/COD ratio from 29% to 34%.The results prove that the EC is effective in color and COD removal. Regarding electrical current, there was no significant difference between 0.5 A and 0.7A in color removal and so 0.5 A is selected as cost effective for the treatment process with estimated Electricity Consumption of 3.2 kWh/m3. Impact of treated wastewater on oxygen uptake rate of activated sludge biomass was investigated and the results indicated that both dye and minerals content have negative impact and therefore it is recommended to reuse treated effluent in industrial processes or consider total dissolved solids in the effluent disposal limits.}, keywords = {Color removal,Electrocoagulation,Iron electrode,Textile wastewater,Treatment}, url = {https://ejchem.journals.ekb.eg/article_31734.html}, eprint = {https://ejchem.journals.ekb.eg/article_31734_91e789948e6595c04992c6951b0bd43b.pdf} } @article { author = {Moawad, Hassan and Abd El-Rahim, Wafaa and Hashem, Mohamed and Gebreil, Gebreil and Sabbor, Ali and Sedik, Mohammed}, title = {Retting and Degumming of Flax Using Biotechnology Eco-friendly Approach}, journal = {Egyptian Journal of Chemistry}, volume = {62}, number = {11}, pages = {2033-2045}, year = {2019}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2019.9571.1641}, abstract = {Flax retting is a treatment process employed to dissolve or rot away much of the cellular tissues and pectins surrounding bast/fiber bundles thus facilitating separation of the fiber from the stem. The microbial retting is one of the most environmentally friendly process. The rich source of microbes contributing to flax retting is the retting water in commercial retting plants. The main objective of this work is to accelerate the flax retting using selected bacterial strains contributing to retting and degumming of flax in order to avoid chemicals causing environmental pollution. In this work, reuse of retting water for acceleration of flax retting was tested. The results show that, the reuse of retted water in new cycle of flax retting has accelerated the retting completion by 8.3-25% depending on the ratio of reused retted water in the retting liquor. Therefore, samples of flax straw retted water and soils from flax fields located in Nile Valley and Delta soils were collected for isolation of flax retting bacteria predominant in the retting effluents. Identification of the isolates was done using morphological, physiological and biochemical tests. Ten bacterial isolates were identified as Lactococcus cremoris, Chryseobacterium culicis, Serratia marcescens, Capnocytophage granulose, Micrococcus luteus, Enterobacter homraechei, Klebsiella oxytoca, Paenibacillus polymyxa, Proteus mirabilis and Bacillus humi. Three efficient strains in pectinase production necessary for flax retting were selected to test their role in enhancing the retting process. These strains are Bacillus humi, Chryseobacterium culicis and Micrococcus luteus which showed specific pectinase activity 37.17, 33.53 and 28 Umg1 respectively.The effect of these strains on retting duration and fiber quality were studied. The combinations of the three strains were tested in the lab scale cylindrical experimental bioreactor and each of the combinations was compared with the classical retting process of the industrial units. The combined treatment using strains: Chryseobacterium culicis, Micrococcus luteus and Bacillus humi resulted in the reduction of the retting duration by 30%, whereas, the mixed inocula containing Chryseobacterium culicis and Micrococcus luteus reduced the retting time by 25%. The mixture of Micrococcus luteus and Bacillus humi reduced the retting duration by 20%. The determination of weight loss, tensile strength, whiteness and yellowness of the fibers after microbial retting was monitored. These present study showed that the obtained specific bacterial strains enhanced the retting process.}, keywords = {Flax,microbial retting,Strength,whiteness and yellowness}, url = {https://ejchem.journals.ekb.eg/article_31762.html}, eprint = {https://ejchem.journals.ekb.eg/article_31762_2c1e3f11285dae54d5785c00f0e6a962.pdf} } @article { author = {Shraa, Samia and Abo Elmagd, Abdel Aleem and Bakr, Al-Sayed and Moustafa, Yasser and Abd El-Aziz, Ibrahim and Shabana, Ahmad}, title = {Some of the Physical and Chemical Characterizations Applied for the Laser Printers toner and Ballpoint Pen Inks to Determine the Sequence of their Intersections}, journal = {Egyptian Journal of Chemistry}, volume = {62}, number = {11}, pages = {2047-2060}, year = {2019}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2019.10960.1702}, abstract = {In the forensic document examination, the determination of the chronological order of intersection strokes of the toner and ballpoint inks is a paramount challenge issue. Two types of intersection are prepared on three different types of paper. A digital microscope and Raman spectroscopy are two nondestructive techniques used to determine these sequences via cross lines. Four physical characteristics observed at intersection point under the digital microscope were a specular reflection, the ink gloss, the ink spreading and gap. The results of the digital microscope determined the two types of intersections strokes except the red color of ink over toner. The results of Raman spectroscopy showed that the spectrum results at the intersection point similar to the pure ink executed later. The complementary technique of Raman spectroscopy and the digital microscope were necessary to achieve a complete determination of the sequences intersection strokes of the toner and ballpoint ink.}, keywords = {Forensic document examination,Strokes intersection,Ballpoint inks,Toner laser printer,Raman spectroscopy,Digital Microscope}, url = {https://ejchem.journals.ekb.eg/article_31232.html}, eprint = {https://ejchem.journals.ekb.eg/article_31232_7eb9de4290b37d8e7d30066fb4c6673c.pdf} } @article { author = {Zaboon, Maysoon and Saleh, Afrodet and Al-Lami, Hadi}, title = {Comparative Cytotoxicity and Genotoxicity Assessments of Chitosan Amino Acid Derivative Nanoparticles toward Human Breast Cancer Cell Lines}, journal = {Egyptian Journal of Chemistry}, volume = {62}, number = {11}, pages = {2061-2075}, year = {2019}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2019.10806.1708}, abstract = {Chitosan, a natural macromolecule, is widely used in medical and pharmaceutical fields because of its distinctive properties such as a bactericide, fungicide and above all its antitumour effects. In this study; we aimed to develop an antitumour system based on Chitosan (Cs) and its some amino acid derivatives, namely Chitosan-Arginine (Cs-Arg) and Chitosan-Clycine-Aspartic acid (Cs-Gly-Asp) derivatives nanoparticles to improve their bioavailability and anticancer activity in antitumour treatments. The derivatives were obtained in a very good yield, and they were characterized by FTIR and some of them characterized by 1H-NMR, and the resulted spectra confirmed the right structures of synthesized chitosan derivatives. All the chitosan and its grafted amino acids were converted to nanoparticles in size by subjecting them to the sonication method. The scanning electron microscope (SEM) was used to determine the shape and size of the prepared polymeric nanoparticles, and they developed using the ImageJ program. The MTT assay and the flow cytometry technique for all prepared polymeric nanoparticles were determined against three different types of human breast cancer cell lines, and the results revealed the highly significant (p< 0.001), in the reducing of breast carcinoma viability in comparison with untreated cell lines, but the cytotoxicity effect of Cs-Arg nanoparticles were larger than Cs-Gly-Asp nanoparticles, whereas there was no genotoxicity effect against BT cell lines for the Cs-Gly-Asp nanoparticles and slight effect for Cs-Arg nanoparticles.}, keywords = {Nanoparticles,Chitosan,Arginine,Glycine,Cytotoxicity,genotoxicity,cell lines}, url = {https://ejchem.journals.ekb.eg/article_31018.html}, eprint = {https://ejchem.journals.ekb.eg/article_31018_237120c781ff4fb2f2786164d08647d8.pdf} } @article { author = {Farrag, Ayman A. and Saleh, Ahmed and Soliman, Nadia and Ibrahim, Maha and El-Shinnawy, Nashwa and Abdel-Fattah, Yasser}, title = {Biocellulose Production by Gluconacetobacter hansenii ATCC 23769: Application of Statistical Experimental Designs and Cellulose Membrane Characterization.}, journal = {Egyptian Journal of Chemistry}, volume = {62}, number = {11}, pages = {2077-2092}, year = {2019}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2019.9975.1662}, abstract = {In this study, an optimization of the culture parameters used for the production of bacterial cellulose (BC) by G.hansenii ATCC 23769 was carried out. This is the first study reported statistical optimization of the fermentation medium by Plackett–Burman Design (PBD) and Box–Behnken Designs (BBD) for BC production by type strain G.hansenii ATCC 23769. The effect of seven culture parameters on BC production was evaluated by implementing PBD, where the results revealed that, the most significant variables affecting BC production were yeast extract, temperature and incubation time. Response surface methodology (RSM) using BBD was applied to find out the optimum level of each significant variable. The optimal levels of the three significant components were found to be yeast extract 13 g/l, temperature 26.3°C and incubation time 12 days with a predicted yield 2.91 g/l. According to the results of the PBD and BBD the following medium composition is expected to be optimum (g/l): mannitol 25, yeast extract 13, ethanol 7 ml/l, pH 7, inoclume size 7%, temperature 26.3°C and incubation time 12 days. Characterization of dried BC membrane was carried out to determine the morphological structure and purity by Scanning Electron Microscopy (SEM), crystallinity by X-ray Diffraction (XRD), chemical structure and functional group by Fourier -Transform Infrared spectroscopy (FT-IR), and thermal stability by Thermogravimetric Analysis (TGA). In addition, mechanical properties such as: the Young’s modulus, tensile strength, elongation at beak % and thickness of BC membrane obtained from G.hansenii ATCC 23769 were determined.}, keywords = {Gluconacetobacter hansenii ATCC 23769,bacterial cellulose,Statistical optimization,Characterization}, url = {https://ejchem.journals.ekb.eg/article_31230.html}, eprint = {https://ejchem.journals.ekb.eg/article_31230_048799d92874134f2118bfa985f6846a.pdf} } @article { author = {Morsi, Samir and Khorshed, Lobna and Samaan, Georgina and Sobhi, Samia and Abadir, Ehab and Ismael, Ahmed}, title = {Polyaniline Emulsion as a Passivator in Styrene-Acrylate Waterborne Coatings for the Protection of Carbon Steel against Corrosion}, journal = {Egyptian Journal of Chemistry}, volume = {62}, number = {11}, pages = {2093-2107}, year = {2019}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2019.11251.1724}, abstract = {The passivation effect of polyaniline (PANI) was utilized to enhance the protection efficiency of styrene-acrylate waterborne coatings against corrosion of carbon steel (CS). Styrene-acrylate emulsion (SACE) based on poly (styrene-co-butyl acrylate) was synthesized via a semi-batch emulsion polymerization while the PANI emulsion (PANE) was prepared by chemical oxidative polymerization of aniline in the micelles of sodium dodecyl benzene sulfonate. The coating formulations (Fs) were prepared by adding PANE to SACE at different weight solid ratios. The viscosity, density, solid content, particle size distribution, the shape of the particles, and stability of the blended emulsions were studied. The properties of the coated-films were evaluated such as hardness, impact resistance, flexibility, adhesion to the steel, glass transition temperature (Tg), and surface morphology. The effect of PANE in enhancing the protection efficiency of SACE film against corrosion of CS was estimated by visual corrosion test, weight loss measurements, and electrochemical Tafel polarization. The results showed an increase in the Tg from 23 oC for pure SACE film up to 36 oC for the film containing the maximum PANI content. SACE film loaded with 0.75% and 1% PANI exhibited the least potential current density of 0.07 and 0.11 µA/cm2, respectively. The formation of a passive layer on the coated-CS was recorded by the shift of corrosion potential for steel to the anodic direction.}, keywords = {styrene acrylate,polyaniline emulsion,corrosion protection,steel,eco-friendly coatings}, url = {https://ejchem.journals.ekb.eg/article_31233.html}, eprint = {https://ejchem.journals.ekb.eg/article_31233_a1024d15070ac76f16431edd19f48bda.pdf} } @article { author = {Almajidi, Mohammed}, title = {New Coulometeric Method for Determination of the Chemical Compositions of Refinery Waste}, journal = {Egyptian Journal of Chemistry}, volume = {62}, number = {11}, pages = {2109-2117}, year = {2019}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2019.7534.1603}, abstract = {Organic sulfur compounds are natural components of crude oil. The presence of these compounds is undesirable, as they cause corrosion of equipment and contaminate the atmosphere during combustion. Sulfur compounds ruin expensive catalysts and release sulfur oxides into the atmosphere when burned, thereby creating environmental problems. Therefore, modern methods are needed to detect, identify and measure the concentrations of sulfur contents, water, and other elements in petroleum products. This work proposed a method for the quantitative analysis of petroleum and petroleum waste, including refinery sludges, based on the coulometry method The present article describes the methods to determine the total amount of sulfur in the waste oil and the number of hydrocarbons in the viscous oil wastes. Additionally, Karl- Fischer method was adapted to measure the content of water in crude oil. In our work reported here, a titration coulometric reagent administration and potentiometric detection using ion-selective electrodes has been worked out and applied for the determination of sulfur and water concentration in crude oil samples.}, keywords = {Coulometry,crude oil,Analyses,Karl-Fischer method}, url = {https://ejchem.journals.ekb.eg/article_31337.html}, eprint = {https://ejchem.journals.ekb.eg/article_31337_46ef35b5d482ed084a26677a550b48b1.pdf} } @article { author = {Abd Elmaksod, Islam and Kosa, Samia and Alzahrani, Hanan and Hegazy, Eman}, title = {Simultaneous Photodegradation and Removal of Organic-Inorganic Pollutants over Zeolite Prepared from Saudi Arabia Kaolin}, journal = {Egyptian Journal of Chemistry}, volume = {62}, number = {11}, pages = {2119-2129}, year = {2019}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2019.12026.1758}, abstract = {In this paper , TiO2 impurities exists in kaolin were investigated for the first time as an active centers for photo degradation of M.B ( Methylene Blue) dye. The study extends to examine the same impurities after its transformation into NaP zeolite. Simultaneous removal of heavy metals (Pb2+, Cu2+, Ni2+, Co2+) in presence of organic dye over metakaolinite phase and NaP zeolite was performed in presence and absence of UV irradiation. The samples were characterized using XRD, SEM , EDX, Diffuse UV-Vis spectrophotometer and finally drawing the kinetic curves of removal of heavy metal ions and M.B dye. The results showed that the TiO2 impurities in metakaolinite exists in anatase form and maintain its existence in the transformed Na-P zeolite with the same phase. Both NaP and metakaolinite showed photo catalytic activity towards degradation of M.B dye. However, the NaP zeolite showed superior behavior for simultaneous removal of both pollutants with UV Irradiation. Investigation and mode of removal of both samples were investigated.}, keywords = {kaolin,Na-P zeolite,Anatase impurities,Photo degradation,simultaneous removal}, url = {https://ejchem.journals.ekb.eg/article_31234.html}, eprint = {https://ejchem.journals.ekb.eg/article_31234_0c961a13f2bc8a73a0ecd8004a72ed1f.pdf} } @article { author = {Abosereih, Nivien. A. and El-sayed, Ghada. M. and Ibrahim, S. A. and Abd El-Razik, A. B. and Hammad, M.A. and Hafez, F. M.}, title = {Enhancement of Diazinon Degradation, Isolation of Organophosphorus Hydrolase and Chemical Analysis of Metabolites}, journal = {Egyptian Journal of Chemistry}, volume = {62}, number = {11}, pages = {2131-2142}, year = {2019}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2019.11689.1748}, abstract = {In this study, diazinon high degradation was achieved by using Ethyl methane sulfonate (EMS) as a chemical mutagen, 38.19% of diazinon was degradedin the minimal media as compared to 1.83% in control media after 5 days.Due to the first step of ethylmethane sulphonate (EMS) chemical treatment, diazinon degradation increased to 62.19% which was subsequently increased to 86.21% after the EMS treatment second step. Analysis of organophosphorus hydrolaseprotein involved in diazinon hydrolysis revealed that itis a member of the MBL-fold metallo hydrolase superfamily and has beta lactamase fold.2-Iso-4-methyl-6- hydroxypyrimidine (IMHP) was detected as the main degradation product of diazinon through GC/MS analysis after 5days of incubation and further metabolized to unknown polar metabolites that weredetected using GC/MS after 10 days.}, keywords = {OPs pesticides biodegradation,Diazinon,EMS,GC/MS analysis}, url = {https://ejchem.journals.ekb.eg/article_31532.html}, eprint = {https://ejchem.journals.ekb.eg/article_31532_ec8333b5bf42b4f233d5b3b37a667947.pdf} } @article { author = {Zayed, Mohamed and Abdallah, Marwa A.}, title = {Structure Investigation of Solid Ion Pairs of Three Azole Drugs-rose Bengal Using Different Spectroscopic Techniques and their Biological Activities}, journal = {Egyptian Journal of Chemistry}, volume = {62}, number = {11}, pages = {2143-2162}, year = {2019}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2019.11907.1750}, abstract = {In the present work is concerned with preparation, separation and structure elucidation of solid ion-pairs of three antifungal drugs Fluconazole (FLZ), Voriconazole (VRZ) and Butoconazole nitrate (BTZ) with Rose Bengal (Rbeng). The solid ion-pairs were prepared and investigated using FT-IR, mass spectral (MS) and thermal analyses (TA), in addition to elemental analysis (EA). The general formulae of the prepared ion-pairs were determined. Moreover, the formulae of prepared ion-pairs were proposed and structurally identified. The biological activities of the separated solid ion-pairs towards five types of bacteria and one type fungi in comparison with their drugs were studied, and they were found to be biologically active more than their parent drugs.}, keywords = {Keywords: Imidazole drugs,Rose Bengal,Ion pairs,Infrared spectra,Thermal analysis,mass spectrometry,biological activities}, url = {https://ejchem.journals.ekb.eg/article_31733.html}, eprint = {https://ejchem.journals.ekb.eg/article_31733_403ebb8bea88ea0ebbcb5df9ade4ca6b.pdf} } @article { author = {Mahmoud, Aya and Youssef, Nadia and Osama, Ahmed and Selim, Mohamed}, title = {Removal of Lead Ions from Industrial Wastewater Using Magnetite Loaded on Silica Support}, journal = {Egyptian Journal of Chemistry}, volume = {62}, number = {11}, pages = {2163-2173}, year = {2019}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2019.5807.1499}, abstract = {Abstract A series of silica supported Fe3O4(Fe3O4/SiO2) nanoparticleswith different Fe3O4 loadings was prepared by co-precipitationmethod. Structural characteristics of the prepared adsorbents were investigated by X-ray diffraction (XRD), and transmission electron microscopy (TEM).The magnetic property was also determined. The adsorption performance of the samples was assessed in the removal of lead ions from aqueous solution. Experiments have been performed to study the effects of several parameters including solution pH, time, initial metal ion concentration and adsorbent dosage on the sorption efficiency. The results of the adsorption experiments indicated that the obtained adsorbents have excellent adsorption ability for the removal of lead ions.}, keywords = {Magnetite,Wastewater,Adsorption,lead ions removal}, url = {https://ejchem.journals.ekb.eg/article_32055.html}, eprint = {https://ejchem.journals.ekb.eg/article_32055_da36472587c3d02347ddc68768b68325.pdf} }