@article { author = {Fouda, Abd elaziz and Abd El-Aal, A. and Sliem, Mostafa and Abdullah, Aboubakr}, title = {Caprylamidopropyl Betaine as a Highly Efficient eco-friendly Corrosion Inhibitor for API X120 Steel in 1 M H2SO4}, journal = {Egyptian Journal of Chemistry}, volume = {63}, number = {3}, pages = {759-776}, year = {2020}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2019.13652.1844}, abstract = {CORROSION inhibition of API X120 steel in a 1M sulfuric acid solution at altered temperatures was investigated utilizing a new eco-friendly surfactant (Caprylamidopropyl Betaine (CAPB)) by Gravimetric and electrochemical test (containing potentiodynamic polarization (PP), electrochemical impedance spectroscopy (EIS). Surface characterization tests containing scanning electron microscopy (SEM), and atomic force microscopy (AFM) are utilized in the study. In addition, kinetic and thermodynamic parameters were measured and discussed. The overall results displayed that the corrosion rate of API X120 steel was significantly lowered with improving the temperature. The polarization curves lead to the CAPB inhibitor is influenced both anodic and cathodic reactions (mixed type inhibitor). Analyses of the surface topography designated an appreciable decrease in the surface roughness as the dose of the inhibitor in the solution improved. Energy-dispersive X-ray and X-ray photoelectron spectroscopy revealed the presence of adsorbed nitrogen atoms on the API X 120 steel surfaces. This work provides a promising eco-friendly inhibitor for mitigating the corrosion of API X120 steel in highly acidic brine environments.}, keywords = {API X120 steel,Caprylamidopropyl Betaine,Quantum Calculations}, url = {https://ejchem.journals.ekb.eg/article_39775.html}, eprint = {https://ejchem.journals.ekb.eg/article_39775_7c7fe8641b96eb1431d7f9abe6bab074.pdf} } @article { author = {Ragab, Tamerr and Yossef, Nadra}, title = {A Comparative Study Between Different Additives for Date Pits Coffee Beverage: Health and Nutritional Evaluation}, journal = {Egyptian Journal of Chemistry}, volume = {63}, number = {3}, pages = {777-790}, year = {2020}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2019.14035.1867}, abstract = {DATE pits are the main waste product of the date manufacturing that could present potentially precious material for the production of coffee drink ingredients. Three coffee types were prepared from roasted date pits powder with some valuable additives. The chemical composition was found to comprise the following: protein, fats, flavonoids, tannins, phenolics, dietary fiber, carbohydrates, fatty acid, essential minerals, and caffeine content. The results indicated that C1 (roasted date pits), C2 (date pits 92.5%, cardamom 2.5%, button roses 4%, nutmeg 0.5% and cloves 0.5%), C3 (date pits 61.67%, barley 30.83%, cardamom 2.5%, button roses 4%, nutmeg 0.5% and cloves 0.5%) had high nutritional values in comparison with commercial coffee. Caffeine concentration was estimated and C3 revealed the lowest caffeine content (2.99 mg/g) whereas, control coffee has the highest caffeine content (36.02 mg/g). The sensory evaluation qualified C3 designated the most overall acceptability (8.70) which is better than the control coffee (8.53). In addition, C3 coffee has the highest antioxidant activity 91.72% and control sample was 84.18%. All samples have no cytotoxicity and propagate the normal cells (Bj-1). Based on all these findings, the prepared coffees are recommended to be a new type of an integrated healthy coffee drink.}, keywords = {Caffeine,Chemical composition,Cytotoxicity,Date pits,Sensory evaluation}, url = {https://ejchem.journals.ekb.eg/article_39776.html}, eprint = {https://ejchem.journals.ekb.eg/article_39776_e029a6d97d3b3cced41689b3eb525170.pdf} } @article { author = {Masoud, Doaa and Azzam, Rasha and Hussein, Hussein and Mekawey, Aml and Abdel-Aziz, Hatem}, title = {Synthesis of Some Novel Substituted Nicotines and Evaluation of Their Antimicrobial Activity}, journal = {Egyptian Journal of Chemistry}, volume = {63}, number = {3}, pages = {791-803}, year = {2020}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2019.13805.1853}, abstract = {A VARIETY of some novel substituted nicotines were synthesized and characterized by spectroscopic means where nicotinic acid hydrazide (6a) and/or (6b) are used as a key intermediate in the synthesis of hydrazones (8a-l) and (10a-f) by the reaction with different aromatic aldehydes (7a-f) and isatines (9a-e), respectively. Moreover, nicotinic acid hydrazide reacted with pentane-2,4-dione (11), 2-ethoxymethylene-malononitrile (13) and thiosemicarbazone (15) generating pyrazoles (12), (14) and 1,2,4-triazole (16), respectively. The newly synthesized compounds were tested against nine microbial strains. Some of these compounds showed a significant activity against several of the microorganisms. Compounds (8d), (10b) and (10c) were determined to be the most active compounds. Compound (8d) showed activity against S. aureus, B. subtilis and A. flavus with IZ = 2.4, 3.2 and 2.6 mm, respectively when compared with reference drugs (Amoxicillin, IZ = 2.3, 3.5 and Griseofulvin, IZ = 2.4 mm). Additionally, compound (10b) showed potent activity against P. aeruginosa and P. expansum with IZ = 2.6 and 2.8, respectively when compared with reference drugs (Amoxicillin, IZ = 2.2 mm and Griseofulvin, IZ = 2.8 mm), respectively, while (10c) showed the same activity as Griseofulvin against P. expansum with IZ = 2.8 mm. The biological activity (SAR) of the evaluated compounds and the relationship between the functional group variations are discussed.}, keywords = {antimicrobial activity,Enaminone,Isatin,Nicotines,Pyridine}, url = {https://ejchem.journals.ekb.eg/article_40311.html}, eprint = {https://ejchem.journals.ekb.eg/article_40311_4301004c853f34997b3032e0a329f224.pdf} } @article { author = {Ahmed, Hind and Hashim, Ahmed}, title = {Fabrication of PVA/NiO/SiC Nanocomposites and Studying their Dielectric Properties for Antibacterial Applications}, journal = {Egyptian Journal of Chemistry}, volume = {63}, number = {3}, pages = {805-811}, year = {2020}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2019.11109.1712}, abstract = {PREPARATION of PVA/NiO/SiC nanocomposites and studying their dielectric properties for antibacterial applications have been investigated. The A.C electrical properties of nanocomposites were studied in frequency ranging (100-5×106) Hz at room temperature. The experimental results showed that the dielectric constant and dielectric loss of (PVA-NiO-SiC) nanocomposites were decreased with an increasing the frequency of applied electric field. The A.C electrical conductivity increases with increasing of frequency. The dielectric constant, dielectric loss and A.C electrical conductivity of (PVA-NiO) nanocomposites were increased with increasing of SiC nanoparticles concentrations. The antibacterial applications for (PVA-NiO-SiC) nanocomposites tested against gram-positive (S. aureus) and gram-negative (E. coli). The results showed that the inhibition zone was increased with increase the concentrations of SiC nanoparticles.}, keywords = {Antibacterial,Conductivity,Dielectric properties,Nanocomposites}, url = {https://ejchem.journals.ekb.eg/article_41120.html}, eprint = {https://ejchem.journals.ekb.eg/article_41120_4df5dd4748704d989707cb7d7e299a3f.pdf} } @article { author = {Almashal, Faeza and Al-Abdullah, Zainab and JASSEM, Ahmed}, title = {Schiff Base Synthesis as a Capping Agent for Green Synthesized Silver Nanoparticles}, journal = {Egyptian Journal of Chemistry}, volume = {63}, number = {3}, pages = {813-821}, year = {2020}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2019.13338.1831}, abstract = {A SCHIFF base 3 was synthesized and used as a new capping agent for synthesis of silver nanoparticles through preventing overgrowth of silver oxide. Schiff base 3 helps to enhance the structural properties of the resulted silver nanoparticles in a distinguishable style. The structure of Schiff base 3 was confirmed on the basis of spectral data (1H nuclear magnetic resonance, mass, and Fourier-transform infrared spectroscopy) and melting point. The ultraviolet–visible was used to monitor the formation of silver nanoparticles within a surface plasmon band at 400 nm. Scanning electron microscopy image shows the particle size of silver nanoparticles which have a spherical shape (6-45 nm). The resulted silver nanoparticles were screened against four types of bacteria: Staphylococcus aureus, Pseudomonas aeruginosa, Klebsiella pneumoniae and Escherichia coli.}, keywords = {Antibacterial activity,Capping agent,Schiff base,silver nanoparticles}, url = {https://ejchem.journals.ekb.eg/article_41145.html}, eprint = {https://ejchem.journals.ekb.eg/article_41145_2a480e97fd60e1bb653816222943af36.pdf} } @article { author = {Barakat, Ola and Abdel-Tawab, Heba}, title = {Improve the Efficiency of Fabrics Performance to the Services Workers (Cleanliness) According to Nature of Their Job}, journal = {Egyptian Journal of Chemistry}, volume = {63}, number = {3}, pages = {823-832}, year = {2020}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2019.13716.1848}, abstract = {CLOTHES play an important role in healthy life, workers is concern on comfort, especially cleanliness workers, whose needs to efficiency in performance of their work. The main aim of this research is improving the efficiency of Fabric performance of cleanliness workers by produce fabrics with using natural fibers that will provide good comfort properties. The influence of fabric factors such as, kind of fibers, weft density and weaves structure on the fabrics properties as weight, thickness, air permeability, water absorbency, strength, abrasion resistance was determined. The results show that, the best sample achieved the best performance on use bamboo 100%, fabric structure twill 1/3, and set 40 weft / cm.}, keywords = {Air Permeability,Clothing comfort,Fabrics performance,Services workers,Water absorbency}, url = {https://ejchem.journals.ekb.eg/article_41692.html}, eprint = {https://ejchem.journals.ekb.eg/article_41692_9cdd58e3f2b1801dddef5665e7a89fd3.pdf} } @article { author = {El-Tabey, Amira E. and Bedir, Ahmed G. and Khamis, E. A. and Abd-El-Raouf, M. and Zahran, Fouad and Yousef, M. Adel and Al-Sabbagh, A. M.}, title = {Synthesis and Evaluation of New Poly Cationic Surfactants as Corrosion Inhibitors for Carbon Steel in Formation Water}, journal = {Egyptian Journal of Chemistry}, volume = {63}, number = {3}, pages = {833-850}, year = {2020}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2019.11344.1730}, abstract = {TWO new polycationic surfactants abbreviated as (PTEAA.10 and PTEAA.12) were prepared by homopolymerization of triethanolamine acrylate monomer followed by quaternization with 1-bromodecane and 1-bromododecane. FT-IR, 1H-13CNMR, and GPC have been used to confirm the chemical structure of the prepared surfactants.The prepared polycationic surfactants have been tested as corrosion inhibitors for carbon steel X65 in formation water. Weight loss, electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization accompanied by SEM and EDX techniques were used to study the inhibition performance of PTEAA.10 and PTEAA.12. The prepared polymeric cationic surfactants act as mixed type inhibitors according to Tafel data. The inhibition efficiency of PTEAA.12 at 250 ppm was 92.8 %. The inhibition action was attributed to the formation of the adsorbed layer of surfactants over X65 surface that was follow Langmuir adsorption isotherm. The resistance of the adsorbed layer (Rct) was a function in concentration and hydrophobicity of the surfactants.}, keywords = {Corrosion inhibitor,EIS,Formation water,Langmuir adsorption isotherm,Poly cationic surfactant,SEM,Tafel}, url = {https://ejchem.journals.ekb.eg/article_41693.html}, eprint = {https://ejchem.journals.ekb.eg/article_41693_b7743261291826eb0f69a5a687ea93e2.pdf} } @article { author = {Priyadarsini, Munmun and Biswal, Trinath}, title = {Recent Progress on the Design and Applications of Guar Gum Based Nano Hydrogel “Guar Gum-g-P(HEMA-co-AM)/Chicken Eggshell” as Superabsorbent}, journal = {Egyptian Journal of Chemistry}, volume = {63}, number = {3}, pages = {851-859}, year = {2020}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2019.11081.1711}, abstract = {Guar gum is water soluble non-ionic plant polysaccharide collected from the fruit seeds of Cyamopsis Tetragonoloba and have been used to synthesize nanohydrogel with the introduction of 2-hydroxyethyl methacrylate (HEMA), acrylamide (AM) and chicken eggshell powder. The equilibrium water content (EWC) of the nanohydrogel were measured at a pH range of 3.6 –10.5 and an optima EWC has been reported at pH 8.4 for biomedical application. The egg shell based Nano hydrogel exhibited good biodegradability property. The prepared materials can be used as a probable super-adsorbent for numerous ionic contaminants present in waste water. The large water content capacities and with large pore sizes of the synthesized nanohydrogel have applications for water saving and prevention of soil erosion in desert localities}, keywords = {Biodegradability,EWC,Drug delivery,Grafting of copolymer,Nano-composite hydrogel (NCH),Super-absorbent}, url = {https://ejchem.journals.ekb.eg/article_42236.html}, eprint = {https://ejchem.journals.ekb.eg/article_42236_0061e0e963f3907f1870b213dbb90a83.pdf} } @article { author = {Alnukari, Sahar}, title = {Anti Lipase Activity of Rosa damascena Extracts}, journal = {Egyptian Journal of Chemistry}, volume = {63}, number = {3}, pages = {861-865}, year = {2020}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2019.10388.1686}, abstract = {OBESITY is a global health concern associated with high morbidity and mortality.One of the strategies in prevention or treatment of obesity is inhibition of pancreatic lipase responsible of absorption of fats. The aim of this study was to evaluate the anti-lipase activity of Rosa damascena Mill. Petal extracts (hydroalcoholic extract, aqueous extract, essential oil and hydrosol). Extracts were assayed for their in vitro activity against PPL (porcine pancreatic lipase) by using spectrophotometry with 2, 4-dinitrophenyl butyrate as substrate. extracts exhibited different anti-lipase activity, alcoholic extract had the highest (62%) anti-lipase activity and is equivalent to 0.11 μg orlistat/mL. followed by essential oil, aqauose extract and rose water with) 55%, 46 and 20% inhibition), respectively. This study supports investigation of effectiveness of these extracts in vivo to be safe and cheap natural medical replacement in the future.}, keywords = {Anti lipase activity,Pancreatic lipase,Rosa damascena Mill}, url = {https://ejchem.journals.ekb.eg/article_43457.html}, eprint = {https://ejchem.journals.ekb.eg/article_43457_b2391185f1a183ef18b67f8ab90d4eff.pdf} } @article { author = {Hessin, Alyaa and Hegazy, Rehab and Safar, Marwa and Yassin, Nemat and Kenawy, Sanaa}, title = {Construction and Assessment of a Novel Vaccine Targeting Hepatocellular Carcinoma}, journal = {Egyptian Journal of Chemistry}, volume = {63}, number = {3}, pages = {867-884}, year = {2020}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2019.14690.1894}, abstract = {IMMUNOTHERAPY is a promising and highly effective method of targeting hepatocellular carcinoma (HCC) cells and improving patient outcomes. There is a continuing need for the development and refinement of current vaccine vehicles to safely target tumors while stimulating robust cell-mediated immune responses. The facultative intracellular bacterium Listeria monocytogenes has proven to be an effective vehicle for the design of cancer vaccines that stimulate potent and long CD8+ T-cell responses. Critical facets of its effectiveness relate to the ability of gaining access to the cytosol of infected host cells and delivering tumor-associated antigens. Here we describe the development and testing of L. monocytogenes ΔprsA2 ΔhtrA strains as effective vaccine vehicles for the safe delivery of HCC antigens. Recombinant L. monocytogenes ΔprsA2 ΔhtrA was engineered to express α-fetoprotein antigens designed to elicit immunity against HCC cells, and tested in a subcutaneous mouse model together with the previously developed L. monocytogenes ΔactA prfA* strain. The results suggest that L. monocytogenes ΔprsA2 ΔhtrA strains may represent a highly attenuated yet effective vaccine vector capable of stimulating immunity against HCC cells in vivo.}, keywords = {Hepatocellular carcinoma,Immunotherapy,Listeria monocytogenes,Tumors,Vaccine vectors}, url = {https://ejchem.journals.ekb.eg/article_43460.html}, eprint = {https://ejchem.journals.ekb.eg/article_43460_2639c668cdb6695b93094d29cb8c0b02.pdf} } @article { author = {Abdel-Shafy, Hussein and Salem, Mohamed and El-Khateeb, Mohamed and Mansour, Mona and Abdel-Shafy, Nancy}, title = {Innovative System for Recycling of Backwashing Water in Drinking Water Plant}, journal = {Egyptian Journal of Chemistry}, volume = {63}, number = {3}, pages = {885-895}, year = {2020}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2019.12186.1762}, abstract = {THE PRESENT study focuses on the efficiency of a suggested innovative system for the treatment of the sand filter backwashing water (SFBW) in the Drinking water treatment plant (DWTP). Usually, the DWTP is consumes between 15 to 20% of their clean treated drinking water to backwashing their sand filter. Such sand filter backwashing water (SFBW) is, usually, discharged as waste. Presently, the suggested innovative system as pilot plant (PP) was employed for the treatment of SFBW. Physical and chemical characteristics of the raw Canal fresh water and the treated drinking water were extensively determined via sampling program. Meanwhile, the inlet SFBW and the treated outlet of the suggested PP were also sampled and subjected to the physical and chemical analysis. The settled particles as sludge of the PP were sand filtered. The filtered water was also evaluated in terms of the physical and chemical characteristics. The suggested PP was operated continuously where it proved efficient removal of TSS, turbidity, and aluminum at 74.1, 84.2 and 71.4%, respectively. Removal of total residue, and alkalinity reached 30.1 and 29.1%, successively. The residual Al3+ was 3.0 mg/l. Correlation between the physical and chemical characteristics of Canal water in one hand and the treated SFBW and the filtered water of the sludge on the other hand indicated that both later waters were at better quality than the former. Therefore, it was suggested to reuse this treated effluents as an additional fresh water resource to the DWTP. The advantages are: saving this wasted water, save the intial supply of water to the DWTP, and to decrease the amount of added alum to the water treatment system while protecting the Canal water from the dischrge of the SFBW that contained residual of Al3+.}, keywords = {Backwashing water,Chemical and physical treatment,Drinking water treatment plants,Drinking water treatment,Innovative water treatment system,Sand filter,Water reuse}, url = {https://ejchem.journals.ekb.eg/article_43469.html}, eprint = {https://ejchem.journals.ekb.eg/article_43469_ca7340cac72f0beddf460e75712451cb.pdf} } @article { author = {Abd El Kawy, Mostafa and Michel, Camilia and Kirollos, Farid and El Kerdawy, Ahmed and Sedeek, Mohamed}, title = {In vitro MAO-B Inhibitory Effects of Citrus trifoliata L. Fruits Extract, Self-Nano-Emulsifying Drug Delivery System and Isolated Hesperidin: Enzyme Assay and Molecular Docking Study}, journal = {Egyptian Journal of Chemistry}, volume = {63}, number = {3}, pages = {897-906}, year = {2020}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2019.14735.1892}, abstract = {FLAVONOIDS have demonstrated neuroprotective activity. Hesperidin, the major flavonoid in the hydroalcoholic extract of Citrus trifoliata L. fruits was quantified quantitatively using HPLC. The calibration curve obtained by plotting different concentrations of hesperidin standard versus the area under the curve revealed that hesperidin content was up to 30 mg/g. Hesperidin was isolated and identified using 1H and 13C NMR. Self-nano-emulsifying drug delivery system (SNEDDS) was prepared to improve the physical characteristics and optimize the activity of the extract. Monoamine oxidase enzyme (MAO-B) inhibitory effects of the SNEDDS, the extract, and the isolated hesperidin were evaluated. They showed significant decrease in the IC50 up to 129.9008, 252.7341, and 707.7631 ng/ml, respectively, compared with selegiline, with IC50 of 133.8403 ng/ml. The SNEDDS showed the highest activity, whereas the hydroalcoholic extract showed higher activity than the pure hesperidin, which could be attributed to synergistic effect of other flavonoids in extract. Hesperidin molecular docking studies were carried out. The ability of hesperidin to interact with the key amino acids in MAO-B binding site rationalizes this pronouncing activity as proven by its docking pattern and docking score compared with that of the known MOA-B inhibitor, safinamide.}, keywords = {Citrus trifoliate,Hesperidin,Monoamine oxidase enzyme-B,Molecular docking,selegiline,Self-nano-emulsifying drug delivery system}, url = {https://ejchem.journals.ekb.eg/article_43484.html}, eprint = {https://ejchem.journals.ekb.eg/article_43484_6d3af9c695209ccd10e863ccd2273668.pdf} } @article { author = {Abd Elhamid, Shaimaa and El meleigy, Abeer and Attia, Adel and El warraky, Ali and Abd-El-Wahab, Saad}, title = {Corrosion Behaviour of Copper– nickel Alloys in LiBr Solutions: A Comparative Study}, journal = {Egyptian Journal of Chemistry}, volume = {63}, number = {3}, pages = {907-919}, year = {2020}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2019.14884.1916}, abstract = {THE ANODIC potentiodynamic cyclic polarization behavior of Cu/10 Ni and Cu/30 Ni alloys in different wide range of LiBr concentrations from 10-1 to 9 M was investigated. The results obtained showed that the breakdown potential, hysteresis loop area and passive current were recorded at higher value of potentials in case of Cu/10 Ni in comparison with Cu/30 Ni. The current density showed higher values during the first few moment of polarization of both alloys studied as result of the changes the taking place on the surface. At 5x10-1 M of LiBr, in case of Cu/10 Ni, two breakdown potentials yielded two hysteresis loops, one of them was at 700 mV and the second was at more anodic potential. These are not recorded in case of Cu/30 Ni where pitting corrosion was manifested at 2 and 4 M LiBr only. The current – time measurement and surface examination of the electrode in case of Cu/30 Ni at 3x10-1 and 5x10-1M LiBr showed that the film formed at low anodic potential of 150 mV clarify the formation of small number of initiated pits which are surrounded by a passive and protective film of doped Cu2O and the surface shown enrichment of Ni. While at all the potential studied for the Cu/10 Ni and Cu/30 Ni the surface of the alloy suffered from denickelification.}, keywords = {Absorption-refrigeration systems,Corrosion,Cu/10 Ni,Cu/30 Ni,Lithium bromide,Surface analysis}, url = {https://ejchem.journals.ekb.eg/article_43913.html}, eprint = {https://ejchem.journals.ekb.eg/article_43913_effc7e4e857273d626e1ea98c735d768.pdf} } @article { author = {Sabana, Irana and Naufal, Muhammad and Wiani, Ika and Zainuddin, Achmad and Hidayat, Ace and Harneti, Desi and Nurlelasari, Nurlelasari and Al-Anshori, Jamaludin and Supratman, Unang and Maharani, Rani}, title = {Synthesis of Antioxidant Peptide SCAP1 (Leu-Ala-Asn-Ala-Lys)}, journal = {Egyptian Journal of Chemistry}, volume = {63}, number = {3}, pages = {921-926}, year = {2020}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2019.12996.1818}, abstract = {SCAP1 is a pentapeptide isolated from the hydrolysate of oyster (Saccostrea cucullata), which has antioxidant and anticancer properties. This study aims to find a novel strategy to obtain antioxidant peptide SCAP1 (Leu-Ala-Asn-Ala-Lys) through chemical synthesis. This study reports the first synthesis of SCAP1 through the solid phase peptide synthesis (SPPS) method with Fmoc strategy on 2-chlorotrityl chloride resin. A HATU-HOAt coupling reagent was employed in all amide bond formations and 95% TFA in water was employed to release the desired peptide from the solid support. The crude peptide was purified using successive preparative-RP-MPLC and RP-HPLC to obtain the pure peptide. The synthesized peptide was confirmed by mass spectrometry, showing a correct molecular ion peak at m/z 516.3143 (M+H)+, referring to the desired SCAP1. 1H-NMR spectra of the peptide revealed protons signals consistent to the structure of SCAP1. During the synthesis, the coupling between Ala and Asn(Trt) was not straightforward, which led to a low yield of the final product. The use of Trt-based Asn was not a suitable option, as it could cause aggregation during the synthesis, eventually leading to a poor yield of the final product. SCAP1 was obtained as a white solid with a percent yield of 8.28%.}, keywords = {Antioxidant peptide,pentapeptide,SCAP1,Solid-phase peptide synthesis}, url = {https://ejchem.journals.ekb.eg/article_43915.html}, eprint = {https://ejchem.journals.ekb.eg/article_43915_c33b7ef984e08cf6f4af205c6b4b911f.pdf} } @article { author = {Abo El -Ola, Samiha and Mosleh, Sayeda and Nasr, Mohamed and Ali, Safaa and El-Bendary, Magda and Abdelraof, Mohamed and ELshakankery, Mahmoud}, title = {Dual Functions of Nonwoven Activated Carbon Fiber for Adsorption of Cobalt(II) and Microorganisms from Waste Water}, journal = {Egyptian Journal of Chemistry}, volume = {63}, number = {3}, pages = {927-1493}, year = {2020}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2019.15395.1935}, abstract = {ACTIVATED carbon fiber (ACF) is considered a superior absorbent material due to its numerous advantages such as, high surface area, several pore volumes and distinct surface chemistry. ACF has the ability to remove organic and inorganic compounds from waste materials. The present work aims to prepare activated carbon fiber from polyacrylonitrile waste fibers and evaluate its ability to remove Co(II) from waste water as well as microbes. The results revealed that, the maximum adsorption of Co(II) onto ACF was 92.9 % at pH 10 and 30 ◦C. The sorption capacity of ACF increased with increasing the pH of the solution from 1.27 mg/g to 44.4 mg/g. Increasing the adsorption time from 10-60 minutes increased the sorption capacity from 38.77 mg/g to 44.41 mg/g. The statistical analysis of the data revealed that there is a significant effect for both pH of the soution and adsorption time. The pathogenic microorganisms such as E. coli, P. aeroginos, B. subtilis, St. aureus, and C. albicans were efficiently removed by ACF. The characterization of surface chemistry of ACF before and after Co(II) adsorption was determined by FTIR and the surface topography was evaluated by SEM.}, keywords = {Adsorption,ACF,PAN waste fiber,Co(II),Microorganisms removal,SEM,FTIR}, url = {https://ejchem.journals.ekb.eg/article_43918.html}, eprint = {https://ejchem.journals.ekb.eg/article_43918_cb79a56ed83950e8d333c4ffe8e8d579.pdf} } @article { author = {A. Sadeek, Sadeek and Abd El-Hamid, Sherif and Rashid, Nihad}, title = {Spectroscopic Characterization and XRD of Some New Metal Complexes with Dithranol in Presence of 8-hydroxyquinoline}, journal = {Egyptian Journal of Chemistry}, volume = {63}, number = {3}, pages = {939-951}, year = {2020}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2019.12638.1789}, abstract = {IN THE PRESENT work, dithranol (Dithr) reacts with Ni(II), Zn(II), Zr(IV), La(III), and Th(IV) in presence of heterocyclic ligand 8-hydroxyquinoline (8HQ) in acetone forming new mixed ligand complexes. The structures of the synthesized complexes were characterized by conventional techniques including melting point, molar conductivity, magnetic properties, elemental analyses, infrared, ultraviolet-visible, 1H nuclear magnetic resonance, and X-ray powder diffraction (XRD) spectra, as well as thermogravimetric (TG) and differential thermogravimetric (DTG) analyses. The molar conductance values of the metal complexes in dimethyl sulphoxide (DMSO) indicated that the complexes were found to be electrolytes with different ratios. The magnetic susceptibility measurements for Ni(II) complex is 3.1 BM with distorted octahedral geometry. TG/DTG studies confirmed the chemical formula for these complexes and established the thermal decomposition processes ended with the formation of metal oxide contaminated with carbon atom. The infrared spectra of the complexes showed shift for ν(O-H) and ν(C=N) in all complexes, which indicated the coordination of oxygen atom of phenolic group and nitrogen atom of pyridine ring of 8HQ with metal ions. X-ray powder diffraction analysis of the compounds showed that Dithr, 8HQ, and their metal complexes display crystalline peaks except Zr(IV) and La(III) complexes.}, keywords = {1H nuclear magnetic resonance,8-hydroxyquinoline,Dithranol,TG/DTG,X-ray powder diffraction}, url = {https://ejchem.journals.ekb.eg/article_43922.html}, eprint = {https://ejchem.journals.ekb.eg/article_43922_86c9a6b22501cd049646c6b24b0f8fd5.pdf} } @article { author = {Abdel-Mottaleb, Mohamed Sabry}, title = {Excited-State Deactivation Pathways of 7-Mercapto-4-Methyl-Coumarins: Theoretical Insight}, journal = {Egyptian Journal of Chemistry}, volume = {63}, number = {3}, pages = {953-960}, year = {2020}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2019.14179.1874}, abstract = {EXPERIMENTALLY reported photophysics of 7-mercapto-4-methyl coumarin compounds in methanol (thiol (C-SH) and thione (C=S)) disclose that these materials are weak or non-fluorescent. When the thiol is methylated, the C-S(CH3) material shows strong fluorescence. This work focuses on applying two computational strategies based on DFT and its time-dependent extension TD-DFT to validate the experimental findings. On-the-fly single reference TDDFT computational is first applied, which identified in a simple way that the S1/S0 intersection is the main radiationless channel leading to fluorescence quenching in mercapto derivatives. A second supporting method based on scanning along of C-S bond distance in the S0 and S1 states is used. Both strategies came to similar conclusions. The applied approaches introduce quantitative explanation of the mechanism of radiationless deactivation in mercapto coumarins due to S1/S0 conical intersection (CI) or due to small S1/S0 energy gap in case of thione tautomer, which is the dominant (thermodynamically favorable) tautomer in the S1 state. The results of this insights may assist designing profitable new fluorescent or non-fluorescent materials by changing specific functional group(s) in the molecule.}, keywords = {Conical intersection,Fluorescence,Tautomers,TD-DFT,Thiol,Thione}, url = {https://ejchem.journals.ekb.eg/article_43929.html}, eprint = {https://ejchem.journals.ekb.eg/article_43929_deeec3bdd3ac5a255757e9bd3819e585.pdf} } @article { author = {Sultan, Maha and Nassar, Mona and Abdel Hakim, A.A and Refaat, Youssef}, title = {Eco-friendly Lignocellulosic Particleboards Bonded with Free-formaldehyde Itaconic Polyamidoamine Epichlorohydrin/soy Protein Adhesive}, journal = {Egyptian Journal of Chemistry}, volume = {63}, number = {3}, pages = {961-972}, year = {2020}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2019.14090.1869}, abstract = {HEREIN, we demonstrate a promising route to prepare an eco-friendly particleboards (Pb) bonded with novel itaconic polyamidoamine epichlorohydrin/soy protein adhesive (IA-PEA/SP). The as prepared materials, IA-PEA and (IA-PEA/SP), characterized with 1H-NMR spectroscopy, viscosity, solid content, shear bonding strength, and water resistance. The physico-mechanical tests of IA-PEA/SP bonded- plywood (0.5/5 weight ratio) attained an enhanced dry and wet shear bonding strength of 5.94 ±0.36 MPa and 1.220.02± MPa compared with an alkali-denatured SP adhesive control. The water resistance tests, proved the sustainability of the prepared composite. Moduli of rupture and elasticity of Pb were 7.07 ± 0.12 MPa and of 0.21± 0.005 GPa. A two-fold internal bonding strength (IB) was obtained at IA-PAE/SP adhesive (40%) compared to the control. The water absorption and the thickness swelling improve by ~ 40% and 33%. TGA and Ʃ Ea calculations showed proper thermal properties. The proposed IA-PAE/SP adhesive paves the way for using green wood adhesives.}, keywords = {Eco-friendly,Free-formaldehyde,Particleboards,Physico-mechanical properties,Shear bonding strength,Soy protein,Thermal analysis}, url = {https://ejchem.journals.ekb.eg/article_43931.html}, eprint = {https://ejchem.journals.ekb.eg/article_43931_26aed728f4c83b589ab1245ef387a3d9.pdf} } @article { author = {Salem, Tarek and Salama, Mohamed}, title = {Developing a New Class of UV-curable Polyurethane Acrylate Resins for Coating Applications}, journal = {Egyptian Journal of Chemistry}, volume = {63}, number = {3}, pages = {973-992}, year = {2020}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2019.14853.1906}, abstract = {POLYESTER (PET) fabrics that containing nitrogen can be considered as a potential material for multipurpose applications. For this purpose, primary attention is given to introduce nitrogen-containing functional group onto the surface of PET fabrics using synthesized UV-curable polyurethane acrylate built-in amine. Moreover, the effect of incorporation the amino groups on the printing behavior of polyester fabric was evaluated. Polyurethane acrylate built-in amine resins were prepared either by one-shot sonochemical polymerization or by using conventional thermal synthesis procedure. Then, UV-curable coatings were prepared by mixing the prepared polyurethane acrylate built-in amine resin with the main components of UV curable coatings such as monomer as a diluent and 2-Hydroxy-4`-(2-hydroxyethoxy)-2-methylpropiophenone as photo-initiator. The prepared built-in amine photopolymers were characterized by (H1-NMR), (FTIR), and (GPC). The morphology of the cured coating was also examined by using scanning electron microscopy (SEM). In addition, fastness properties of the printed fabrics and color strength were carried out to assess the effectiveness of the incorporation of the nitrogen groups on the stability of the coating layer. The results showed that, the IR Spectra of vinyl terminated PU polymers has a characteristic peak of N-H stretching at 3326 cm−1 accredited to the formation of urethane bond. It was also found that treatment of PET fabric with polyurethane acrylates resin containing built-in amine results in an increase in the affinity to acid dyes. The current work opens up a novel opportunity to develop nitrogen-containing PET fabrics.}, keywords = {coatings,Photocurable resin,Photopolymerization,polyester,Textile printing}, url = {https://ejchem.journals.ekb.eg/article_44102.html}, eprint = {https://ejchem.journals.ekb.eg/article_44102_f509df7ac737ac877124b665ed2a273a.pdf} } @article { author = {Salaeh, Salah and Ahmed, Fouad and Ahmed, Osama and Sayed, Mohamed}, title = {Preparation, Characterization and Properties of Protein Nanoparticles from Feather Waste}, journal = {Egyptian Journal of Chemistry}, volume = {63}, number = {3}, pages = {993-999}, year = {2020}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2019.13534.1855}, abstract = {THE PURPOSE of this paper was to investigate the feasibility of a newly developed method for producing protein nanoparticles (PNP) from chicken feather, prepared by the reduction technique with plant extracts followed by ultrasonic treatment. Characterization of the prepared sample was confirmed using particle size distribution, zeta potential, X-ray diffraction, Fourier-transform infrared, and scanning electron microscope. The particle size distribution results of the sample showed that the average diameter was 69 nm width by 60 nm length. Scanning electron microscope study showed that the diameter of the sample was about 106.8–215.7 nm. Radiographic analysis shows obviously that the crystallinity of PNP decreases with their particle size. The results indicated the positive effect of sonication on reducing particles size after reduction process while maintaining the basic chemistry and structural integrity of the native keratin protein. For instance, the authors have shown that preparation of PNP could be produced from feather waste, which is believed to be the most promising approach because of the milder process conditions, leaving no harmful byproducts. These results are very important for industrial application with the production of PNP as an inexpensive source from feather waste.}, keywords = {Chicken feather,Nanoparticles,Particle size,Reduction,Sonication,Zeta potential}, url = {https://ejchem.journals.ekb.eg/article_44762.html}, eprint = {https://ejchem.journals.ekb.eg/article_44762_d7b16b0e0b9aee4cf9a6e79d55311eb4.pdf} } @article { author = {Shaker, Rania N and Ahmed, Omnia. Kh.}, title = {Utilization of Natural Dyes to Fabricate Multifunctional Silk}, journal = {Egyptian Journal of Chemistry}, volume = {63}, number = {3}, pages = {1001-1008}, year = {2020}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2019.13807.1895}, abstract = {VARIOUS wet processing operations of textiles from the initial preparatory process to final finished clothes are now focused for green technology. Several conventional non-ecofriendly chemicals are being replaced by natural based products that are safe to the environment and health during manufacturing and usage. Natural dyes were used instead of synthetic dyes due to environmental conditions. Natural dyes are very important for textiles as well as to replace synthetic dyes, because of non-polluting, non-carcinogenic and eco-friendly. Silk is the lightest, thinnest and softest natural fiber and has many applications in the textile field. In the present work the silk fabric pretreated with PEG then dyed with two different natural dyes, the fabric then compared with those dyed with natural dyes only and with those with dyes and mordents. protective properties such as UV- blocking give a remarkable improvement in UPF values. the antibacterial reduction percentage was also enhanced. significant enhancement in dyeability values K//S values are demonstrated. Also, the mixture with PEG showed good tensile strength, wettability Enhancement and also crease recovery angles.}, keywords = {Antibacterial activity,Multifunctional finishing,Natural dyes,Silk,Ultraviolet protection}, url = {https://ejchem.journals.ekb.eg/article_44764.html}, eprint = {https://ejchem.journals.ekb.eg/article_44764_6e89a2dea4f007778e2aeea7fdbe01c5.pdf} } @article { author = {Mahmoud, Marwa and Abou-elmagd, Mahmoud}, title = {Template Synthesis, Spectral and Thermal Properties of Nd(III) Metformin Schiff-Base Complexes As Potential Hypoglycemic Agents}, journal = {Egyptian Journal of Chemistry}, volume = {63}, number = {3}, pages = {1009-1031}, year = {2020}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2019.13640.1858}, abstract = {ND(III) complexes with Schiff-bases obtained by condensation of metformin with each of salicylaldehyde (HL1); 2,3- dihydroxybenzaldehyde (H2L2); 2,4-dihydroxybenzaldehyde (H2L3); 2,5- dihydroxybenzaldehyde (H2L4) and 3,4-dihydroxybenzaldehyde (H2L5); and 2-hydroxynaphthaldehyde (HL6) have been synthesized using the template reaction. The complexes were characterized by elemental analysis, conductivity and magnetic moment measurements, IR, UV-Vis., emission, GC-MS and XRD spectroscopy and thermal analysis. The complexes are eight coordinated structure with formulae [NdL1-4,6(NO3)2(H2O)3].nH2O where n = 2, 3, 3, 4, 5 and [NdL5(NO3)(H2O)5].2H2O. The nitrate appears to coordinate in the monodentate fashion to the metal ion. The complexes have hexagonal bipyramide stereochemistry as shown by the UV-Vis spectra and molecular modeling calculations. The thermal stabilities of the complexes have been studied by TGA, DTG and DTA and Coats-Redfern method was used to calculate their kinetic parameters. The mechanism of thermal decomposition was suggested using IR spectra at different temperatures. The association constants (Kb) for the interaction of glucose with the complexes were calculated at physiologically relevant pH (phosphate buffer) using UV-Vis and fluorescence spectroscopy as well as viscosity measurements.}, keywords = {Glucose sensor,Metformin Schiff-bases,Nd(III) complexes,Spectral and thermal properties}, url = {https://ejchem.journals.ekb.eg/article_44768.html}, eprint = {https://ejchem.journals.ekb.eg/article_44768_0f768f608a759654f6c7ad04f2579eeb.pdf} } @article { author = {Dhmees, Abdelghaffar and Rashad, Ahmed and Abdullah, Eman}, title = {Calcined Petroleum Scale- CaO a Cost-Effective Catalyst for Used Cooking Oil Methanolysis}, journal = {Egyptian Journal of Chemistry}, volume = {63}, number = {3}, pages = {1033-1044}, year = {2020}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2019.15107.1912}, abstract = {THE OBJECTIVE of the research aim to study biodiesel production from used cooking oil using calcium oxide derived from petroleum scale (PS) as catalyst in transesterification process. Calcium oxide based catalyst was obtained by calcinations of petroleum scale at 850ºC for 4 h. Calcined Petroleum scale catalyst (CPS-CaO) was characterized by different techniques such as: XRD, EDAX, N2-Adsorption /desorption and basic strength by Hammett method. Response surface methodology (RSM) was used for optimizing transesterification process depending on Independent variables, i.e. methanol to oil molar ratio (M:O), catalyst concentration and reaction time. The Optimal parametric values lead to maximum biodiesel yield (~97%) were obtained at Methanol:Oil molar ratio of 12:1; catalyst loading of 2.0 %w/v and reaction time of 2 h at constant temperature 65oC. The results of this study showed a high performance, and the proposed experiment could be used as a new and innovative way to produce biodiesel in the future using cost-effective heterogeneous catalyst based on petroleum scale as a waste materials.}, keywords = {Biodiesel,Heterogeneous catalyst,Petroleum scale,Used cooking oil}, url = {https://ejchem.journals.ekb.eg/article_45088.html}, eprint = {https://ejchem.journals.ekb.eg/article_45088_d76a613f2197259fdc15b3d4d80321a2.pdf} } @article { author = {Mostafa, Medhat and Salah, Hamdy and Shehata, Nabila}, title = {Role of Low-cost Nano RHA on Physico-mechanical Properties of Cement Mortar}, journal = {Egyptian Journal of Chemistry}, volume = {63}, number = {3}, pages = {1045-1054}, year = {2020}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2019.12487.1777}, abstract = {THIS WORK compares nano-structured rice husk ash (RHA) before grinding and nano-sized RHA after grinding in terms of the physical properties of cement and mortar performance. Blaine surface area, sieve analysis (45 μm mesh), water of consistency, expansion, initial and final setting time, and compressive strength (at 2, 7, 28, 60 and 90 d of curing) measurements were performed for 0, 2, 4, 6, 8 and 10% RHA replacement of cement by weight. RHA both before and after grinding enhanced the cement physical and mechanical properties, as well as the mortar performance in terms of the long-term aged strength, at a constant water/cement ratio and without the use of any type of super-plasticizer (SP). The enhancement became stable at all long-term ages for 10% replacement in the case of RHA before grinding and 4% replacement in the case of RHA after grinding. More considerable enhancements were observed with a high replacement percentage up to 10% nano-sized RHA due to the small size of its particles, which increased the pozzolanic reactivity and worked as a filler material to produce a denser mortar.}, keywords = {Cement mortar,Low-cost,Nano,Rice husk ash}, url = {https://ejchem.journals.ekb.eg/article_45106.html}, eprint = {https://ejchem.journals.ekb.eg/article_45106_4e61f0dc55bfcfcaaff2d8403989874c.pdf} } @article { author = {Saleh, Hind}, title = {Correlation between Parameters of Extrusion Technique and Both of Optical and Physical Characteristics of Reinforced Polypropylene Composites}, journal = {Egyptian Journal of Chemistry}, volume = {63}, number = {3}, pages = {1055-1061}, year = {2020}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2020.21244.2269}, abstract = {THIS RESEARCH was an attempt to illustrate the correlation between parameters of extrusion technique (screw speed) which was used to produce conventional and hybrid reinforced polypropylene composites and their optical and physical characteristics. The obtained results demonstrated the responses of hybrid reinforced composites were more stable and higher than those of conventional reinforced composites. Furthermore; the density and optical traits of hybrid composites were influenced extremely by the screw speed variation (reduction). The syndiotactic polypropylene was used as a matrix while talc and graphite were used as reinforcing agents (fillers) to prepare diverse weight percentages of reinforced polypropylene composites.}, keywords = {Agent,Fluctuation,Hybrid,impact,Matrix,Response,Weight percentages}, url = {https://ejchem.journals.ekb.eg/article_69317.html}, eprint = {https://ejchem.journals.ekb.eg/article_69317_c4c49f0cfce4337e17cdd4636f8b221c.pdf} } @article { author = {Abdel-Wakil, Walid and Fahmy, Alaa and Kamoun, Elbadawy A. and Hassan, Wassem and Abdelhai, Farag and Salama, Tarek M.}, title = {A New Route for Synthesis of Polyurethanevinyl Acetate Acrylate Emulsions as Binders for Pigment Printing of Cotton Fabrics}, journal = {Egyptian Journal of Chemistry}, volume = {63}, number = {3}, pages = {1063-1073}, year = {2020}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2020.21712.2292}, abstract = {HEREIN, two polyurethane oligomers were successfully synthesized using a prepolymer mixing process. The prepolymers were synthesized based on the step-growth addition polymerization of polypropylene glycol, Methylene diphenyl diisocyanate and 2-hydroxyethyl methacrylate or 2-hydroxyethyl acrylate. Isopropanol was functioned as the isocyanate blocking agent. Thereafter, different terpolymer emulsions were prepared by the emulsion graft copolymerization with the vinyl acetate monomer in presence of 2-ethylhexyl acrylate as a vinyl monomer. The chemical structures of the synthesized oligomeric monomers were probed by FTIR spectroscopy and found to vary with the content of acrylic monomer used in the oligomer synthesis phase (i.e.hydroxyethyl acrylate or hydroxyethyl methacrylate). The topography, thermal stability, and particle size of terpolymers were investigated by SEM, TGA, and zeta potential, respectively. The TGA results demonstrated marked enhancement in thermal stability of the synthesized terpolymers up to ca. 600°C, which was concurrent with enhanced surface homogeneity and film properties as evidenced by the SEM images. These terpolymers showed also property enhancement as binders for textile pigment printing in terms of rubbing resistance, color strength and fastness to washing when compared to the commercial binders. These judgments would provide a new competent synthesis route by introducing polyurethane acetate vinyl acrylate as the binder for use in pigment printing of cotton fabrics.}, keywords = {Polyurethane acetate vinyl acrylate,Surface coating,Terpolymer,Textile binder,Vinyl monomer}, url = {https://ejchem.journals.ekb.eg/article_69319.html}, eprint = {https://ejchem.journals.ekb.eg/article_69319_abe6c48e4ef7c963728d8b028e259d1c.pdf} } @article { author = {Abdelsalaam, Hayam and Ewies, Ewies}, title = {Novel Heterocycles via 2-Cyano-N-arylacetamide Synthesis with Docking Studies of Novel Heterocycles as Antimicrobial Agents Utilizing 2-Cyano-N-arylacetamide}, journal = {Egyptian Journal of Chemistry}, volume = {63}, number = {3}, pages = {1075-1085}, year = {2020}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2020.21812.2294}, abstract = {2-CYANO-N-arylacetamide reagent is used in a straight forward synthesis of various interesting nitrogenous heterocycles such as iminocoumarine, thiazole, dihydropyridine and imidazole or benzoimidazole. Molecular docking studies are described to show the most active compounds as antimicrobial agents. Also, Biological testing of these compounds for their antimicrobial activities against some strains of Gram bacteria and strains of fungi has been carried out.}, keywords = {Antimicrobial activities,2-Cyano-N-arylacetamide,Iminocoumarine,Thiazole and Dihydropyridine}, url = {https://ejchem.journals.ekb.eg/article_69320.html}, eprint = {https://ejchem.journals.ekb.eg/article_69320_030a1fff8c1f5facdaa79f64a29cb02e.pdf} } @article { author = {Gaffer, Hatem and Elapasery, Morsy and Abbas, Dina and Allam, Emad}, title = {Synthesis of Some New Aryl-azo Derivatives Clubbed with Pyridone and Evaluating their Biological Broadcast}, journal = {Egyptian Journal of Chemistry}, volume = {63}, number = {3}, pages = {1087-1099}, year = {2020}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2020.22449.2335}, abstract = {SYNTHESIS of some new Aryl-azopyridone analogues was synthesized through coupling of diverse Diazonium salts with 1-ethyl-4-methyl-2,6-dioxopiperidine-3-carbonitrile. The proper structures for all incorporated derivatives were demonstrated to be confirmed via various physical and spectral analyses performed. The synthesized analogues were probed as cytotoxic agents toward four dissimilar cell lines, in which the results displayed persuasive activities relative to the results of antibiotic standards. In addition, the antioxidant activity of the synthesized analogues was evaluated using ABTS•+ method.}, keywords = {Anticancer activities,antioxidant,Cytotoxicity,Diazonium salts,Pyridones}, url = {https://ejchem.journals.ekb.eg/article_69321.html}, eprint = {https://ejchem.journals.ekb.eg/article_69321_bc37a419f0639fb824cb20ff816dfc61.pdf} } @article { author = {Elapasery, Morsy and Yassin, Fathy and Abd El-Azim, Mohamed and Abdellatif, Mahmoud}, title = {Enaminones-Assisted Synthesis of Disperse Dyes. Part 1: Low Temperature Dyeing of Polyester Fabrics}, journal = {Egyptian Journal of Chemistry}, volume = {63}, number = {3}, pages = {1101-1108}, year = {2020}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2020.22868.2357}, abstract = {CARRIER coloring is a technique for dyeing polyester materials that is utilized when vital. Use of carriers in coloring empowers the coloring of polyester materials at atmospheric pressure. A series of new disperse dyes has been prepared and used in dyeing polyester fabrics at a temperature of 100 °C and a study of the optimum conditions for the use of both the carrier and the dispersing agent. The relationship between the dye concentration used in dyeing polyester fabrics with dispersed dyes and the color strength K/S were studied using three different concentrations of dye weight. Finally, polyester fabrics dyed with disperse dyes have shown that they possess acceptable fastness properties of light and are very good fastness against washing, perspiration and rubbing.}, keywords = {Disperse dyes,Carrier}, url = {https://ejchem.journals.ekb.eg/article_69405.html}, eprint = {https://ejchem.journals.ekb.eg/article_69405_74c3a998afb214ac5785937c0e47468a.pdf} } @article { author = {Al-Wasidi, Asma and Naglah, Ahmed and Kalmouch, Atef and Adam, Abdel Majid and Refat, Moamen and Moustafa, Gaber}, title = {Preparation of Cr2O3, MnO2, Fe2O3, NiO, CuO, and ZnO Oxides Using Their Glycine Complexes as Precursors for In Situ Thermal Decomposition}, journal = {Egyptian Journal of Chemistry}, volume = {63}, number = {3}, pages = {1109-1118}, year = {2020}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2020.20679.2240}, abstract = {GLYCINE (Gly) complexes play an important role in human life. Zn(II), Cu(II), Ni(II), Fe(III), Mn(II), and Cr(III) complexes were synthesized with glycine (Gly). These complexes were characterized by infrared spectroscopy (FT-IR). Based on the stoichiometric data, Gly form a chelate complex in a bidentate fashion at a 1:3 ratio with the trivalent metal ions [Cr(III), Fe(III)] and a 1:2 ratio with the divalent ones [Mn(II), Ni(II), Cu(II) and Zn(II)]. Metal oxides were derived from each of the Gly complexes using thermal decomposition at 800°C. FT-IR analysis of the resulting solids revealed their formation in pure form.}, keywords = {Chelation,FT-IR,Glycine,Metal oxide,Thermal decomposition}, url = {https://ejchem.journals.ekb.eg/article_69521.html}, eprint = {https://ejchem.journals.ekb.eg/article_69521_3e6d23f72db602bc09b29219f89ff614.pdf} }