2024-03-29T12:44:22Z
https://ejchem.journals.ekb.eg/?_action=export&rf=summon&issue=630
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2017
60
5
1H-Indole-3-carboxaldehyde: Synthesis and Reactions
Eslam
El-Sawy
Heba
Abo-Salem
Adel
Mandour
1H-Indole-3-carboxaldehyde and its derivatives have represented the key intermediates for the preparation of biologically active compounds as well indole alkaloids. Also they are important precursors for the synthesis of divers heterocyclic derivatives because their carbonyl groups facilely undergo C–C and C–N coupling reactions and reductions. This review highlights the recent advances in 1H-indole-3-carboxaldhyde chemistry via discussing different synthetic procedures developed for the preparation of its derivatives, as well sheds the light on the most common reactions of 1H-indole-3-carboxaldhyde derivatives and exploitation of these derivatives as the blocks of many biologically active compounds.
1H-Indole-3-carboxaldehyde
Synthesis
Reactions
Heterocycles
2017
10
01
723
751
https://ejchem.journals.ekb.eg/article_3686_153a899f9f28aaf99cce2c86f62999e4.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2017
60
5
Natural Meat-Like Aroma with Antioxidant Potency Based on Bovine Fat by-product via Millard Reaction
Adel G.
Abdel-Razek
Elshahat
Nashy
Ahmed
El-Ghorab
Khaled
El-Massry
Meat-like aroma components, in the present work, were generated via interaction of cysteine with bovine fat (by-product) model systems. Gas chromatography (GC) and gas chromatography/mass spectrometry (GC/MS) were used to identify the obtained volatile compounds. Thermal treatment of cysteine/ bovine fat by-product with or without water gave several thiol compounds such as 2-methyl-3-furanthiol, 2-furylmethanethiol and methyl-dihydrofuranthiol. A number of disulfides compounds were formed as 2-methyl-3-furyl-2-methyl-3-thienyldisulphide, bis-(2-methyl-3-furyl) disulphide, 2-methyl-3-furyl-methyl-2-xopropyldisulphide. Furans and sulfur-containing compounds are important precursors of meaty aromas.Sensory evaluation of the aroma products was performed for cysteine and bovine fat by-product model systems according to (ISO) and the result revealed that the presence of volatiles having boiled note in presence of water may be due to the preponderance of thiol compounds (22.33 %) and roasted character attributes to the presence of higher content of pyrazine (1.28%), 2-methylthiazole (0.4%), furfural (3.0%) and methylfuraneol (31.47%). It was found that, the antioxidant activity of model system containing water has higher antioxidant activity (78.0±1.8%), in comparison with tert-butylhydroquinone [TBHQ] (98.73±2.3%). From the above results, the obtained natural identical meat-like aroma concentrate, could be applied as a food additives.
Meat like aroma
Bovine fat
Millard reaction
Antioxidant activity
Sensory evaluation
2017
10
01
753
767
https://ejchem.journals.ekb.eg/article_3714_251a8f0a471a55cacb7c4838659878b8.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2017
60
5
A Comparative Study of The Cure Characteristics, Mechanical Properties and Abrasion Resistance of Silica and Carbon Black Filled NBR/SBR Blends
Doaa
El-Nashar
Ebtesam
E. Ateia
H. H.
Hassan
A. K.
Abd El-Aziz
Comparison between incompatible and compatible blend of nitrile rubber (NBR) and styrene butadiene rubber (SBR) with acrylonitrile butadiene styrene (ABS) is studied. Physical rheological characteristics and abrasion resistance for the investigated samples are performed. The use of acrylonitrile butadiene styrene (ABS) as compatibilizer improves the abrasion resistance of the blends. The results indicated that filled blends with carbon and silica offer processing advantages over unfilled blends. The ultrasonic and scanning electron microscope (SEM) are used to analyze the obtained data.
Rubber
rheology
Microscopy
blend
Abrasion Resistance
2017
10
01
769
777
https://ejchem.journals.ekb.eg/article_3584_d4feb247cfe24e104d790bb4644f8a16.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2017
60
5
Casting of Acrylamide/Poly (vinyl alcohol) Reinforced by Carbon Nano-Wire for Using into Proton Exchange Membrane Fuel Cell
Mohamed
El-Toony
Gamma irradiations pose very important role for finally cross-linking, poly (vinyl alcohol) (PVA) and Acrylamide (AAm) with different ratios. The addition of 0.3% nanowire-carbon (PAC) into the cast mixture was well mixed prior to being exposed to the irradiation doses (kGy). It was found that; 10 kGy was the optimum dose for attaining accepted physical properties for the fuel cell application. Characterizations of the casted membranes were carried out using FTIR, thermal gravimetric analysis (TGA) and scanning electron microscope (SEM) for their investigations chemically, thermally and morphologically respectively. Studying the properties of the membranes was performed using ion exchange capacity, water uptake and tensile strength for testifying their availability into the proton exchange membrane fuel cell (PEMFCs). Proton conductivity was measured (maximum value was 8.1 x 10-2 S/cm) and free volumes sizes were evaluated using positron annihilation lifetime spectroscopy (PALS). The casted membrane confirmed their capability for using into PEMFCs by measuring the fuel cell performance and durability (up to 500 hours) comparing to compressed Nafion® 1110.
Keywords: Casting
Gamma Irradiation
acrylamide
Poly vinyl alcohol
carbon nanowire
Fuel cell
2017
10
01
779
791
https://ejchem.journals.ekb.eg/article_3716_dfe041fa1bb573bd9bbdbbddb0d0a796.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2017
60
5
Preparation of Carbonaceous Hydrochar Adsorbents from Cellulose and Lignin Derived from Rice Straw
Ghada
Mohamed
Ola
El-Shafey
Nady
Fathy
Abstract In this paper, carbonaceous hydrochar adsorbents with highly functionalized surface active sites were prepared from cellulose and lignin constitutes of rice straw via hydrothermal treatment at 180oC for 20h followed by carbonization process at 500oC for 2h without external gas flow. Two carbonaceous samples were obtained from cellulose and lignin and denoted as RC-C and RL-C, respectively. The resulting hydrochar adsorbents were characterized using means of SEM, TEM, FTIR, Boehm's titration and adsorption of N2 gas at -196oC. Kinetic and equilibrium adsorption studies using methylene blue (MB) dye as model pollutant compound in industrial wastewaters were determined. The calculated adsorption efficiencies of the adsorbents were considerably depended on the initial dye concentration, contact time and temperature. The obtained adsorption results were found to describe well using the pseudo-second order kinetic and Langmuir isotherm models. Monolayer adsorption capacity of RC-C and RL-C reached to 100 and 40 mg/g towards MB dye, respectively. Based on these findings, the produced hydrochars from cellulose and lignin of rice straw can be emerged as low-cost and valuable adsorbents for removing dye contaminants from wastewater.
Hydrothermal treatment
Hydrochar
cellulose
lignin
Adsorption
Cationic dye
2017
10
01
793
804
https://ejchem.journals.ekb.eg/article_3965_e9fc5f7fd255be8de2b447463269e5bb.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2017
60
5
Effect of Nitrogen Fertilization Rates, Plant Spacing and Their Interaction on Essential Oil Percentage and Total Flavonoid Content of Summer Savory (Satureja hortensis L.) Plant
A.S.
EL-Leithy
S.H.
EL-Hanafy
M. E.
Khattab
S.S.
Ahmed
Ahmed
Abd El- Ghafour
Summer savory (Satureja hortensis L.) plant is one of most promising plants suitable for cultivation in the conditions of Egypt. A filed experiment was carried out at Department of Ornamental Horticulture, Faculty of Agriculture, Cairo University, with Department of Medicinal and aromatic Plants research National Research Center, Dokki, Giza, Egypt. during two successive seasons 2014 and 2015. The experimental design was a factorial in split plot with three replicates. The aim of the work was to study the effect of nitrogen fertilization at the rates of N0, N1, N2 and N3 (0, 40, 80 and 120 kg N/ feddan ) as equivalents 0.0, 200, 400 and 600 kg/feddan of ammonium sulfate fertilizer 20.5% N, respectively as the main plots. Plant spacing was defined as S1, S2 and S3 (45×50, 30×50 and 15×50 cm, respectively) between the plants, as sub-plots. The effect of these treatments on essential oil percentage, essential oil constituents and total flavonoid content of S. hortensis L. was recorded. The results showed that the highest level of N fertilizer to combined with the least plant spacing had a significant effect on increasing the essential oil percentages in both seasons. The major essential oil constituents were carvacrol (47.26 and42.90%) and γ-terpinene (38.30 and 39.10%) at the first and second cuts, respectively. Generally, carvacrol content was not affected by N fertilizer, but the γ-terpinene content increased slightly. The other lower percentage components arranged in descending order including ρ-cymene, terpinolene, α-terpinene, α-pinene and α-thujene contents were not significantly affected by such treatments. Total flavonoid content decreased with all N fertilizer levels at the first cut (June), the opposite trend was noticed at the second cut (August) in both seasons. Plant spacing at intermediate density was associated with the production of high contents of total flavonoids at both cuts during both seasons.
Keywords: summer savory
Satureja hortensis L
N fertilization
plant spacing
Carvacrol
γ-terpinene
Total flavonoids
2017
10
01
805
816
https://ejchem.journals.ekb.eg/article_3689_f076e4e3a3ee2c81b6851ce8263fb367.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2017
60
5
Wollastonite Ceramic/CuO Nano-Composite for Cadmium Ions Removal from Waste Water
Nabila
Ammar
Ahmed
Fahmy
Sayed
Kanawy Ibrahim
Esmat
Hamzawy
Mohamed
El-Khateeb
Nano-particles, within 29-45 nano-meters, based on wollastonite were prepared with/without CuO through wet method. The adsorption process was occurred on nano-particles powder ceramic at different conditions (pH, contact time and adsorbent dose) for removing of cadmium ions from wastewater. The SEM of nano-particles after treatment of wastewater revealed that surface texture of the blank adsorbents changed totally due to the adsorption of cadmium ions on the particles. At the optimum operating conditions, the removal efficiency of cadmium ions reached 98.88 %. The obtained results showed that the produced ceramic nano-particles could be used efficiently for removal of cadmium ions with reasonable simple and low cost technique.
Wollastonite
ceramic
Nano materials
Water treatment
Adsorption
2017
10
01
817
823
https://ejchem.journals.ekb.eg/article_3725_40999ef4b376e058c215799eec0c33da.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2017
60
5
Preparation and Characterisation of Oil Spill Dipersants Based on Polyglycerol Nonionic Surfactants
Naglaa
Khalil
Ashgan
Awad
Renee
Abdalla
Nihal
Shaker
Dispersants, usually blending with several surfactants and a solvent, are used to enhance oil spill dispersion as small droplets in water column. Although there is growing acceptance of dispersants as a counter measure to marine oil spill around the world, the two major issues with the dispersants are their toxicity to marine life and dispersion effectiveness (DE) for crude oil. To develop more efficient and less toxic dispersants, three dispersants of hexaglycerol esters (hexaglycerol laurate, hexaglycerol myristate and hexaglycerol palmitate) non-ionic surfactants were prepared. Salinity at different temperatures of the three dispersants was investigated. They had high dispersion effectiveness (DE) for studied crude oil. Emulsion stability was also examined and it was found that all the prepared surfactants were able to form stable emulsions and their stability was very high, extending for months.
Key words: Polyglycerol
fatty acids esters
oil spill dispersants
Effectiveness
Emulsion stability
2017
10
01
825
834
https://ejchem.journals.ekb.eg/article_3966_e378ba073c816214491cf8795130fdb7.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2017
60
5
Enhancement the Bioremediation of Crude Oil by Nanoparticle and Biosurfactants
Huda
El-Sheshtawy
Naglaa
Khalil
Wael
Ahmed
Nabila
Amin
The present study concerns the bioremediation process of oil contaminated soil from Suez Oil Processing Company. Nineteen crude oil-degrading bacterial isolates were isolated from this oil-polluted area. Four bacterial species showed the highest growth rate on crude oil hydrocarbons. The bioremediation process was studied by pure and bacterial consortium. The oil contents in the different microcosms reduced up to 80% via bioremediation after 7 days. The Gas Chromatographic analysis of the crude oil remaining in different culture media after one week was determined. The nanoparticle and biosurfactant showed selective bioremediation enhancement for n- and iso- paraffins. The percentage biodegradation was reached into the maximum value in microcosm containing biosurfactant, nanoparticle and bacterial consortium of the best four bacterial strains into 90% after 7 days. The complete degradation of some different members of polyaromatics and the percentage biodegradation of other polyaromatics increased in different microcosms which investigated by HPLC analysis.
Oil pollution
biodegradation
biosurfactants
Nanoparticles
2017
10
01
835
848
https://ejchem.journals.ekb.eg/article_3719_b7290cd2732e0d08409a57f05e40ce06.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2017
60
5
Preparation and characterization of Metal Complex Hydrogels Crosslinked with Hyperbranched Polyester
Ahmed
Haroun
Osama
Hakeim
Olga
Trhlikova
Miroslave
Slouf
Milos
Netopilik
This work deals with preparation and characterization of metal complex hydrogels based on crosslinked chitosan with hyperbranched polyester generation 2. These materials were prepared using miniemulsion technique with different ratios. Besides, the metal complexes using Co, Ni and Fe salts were investigated. All the prepared materials were characterized using Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), particle size and zeta potential analysis using dynamic light scattering (DLS) technique. Moreover, XRF was also carried out. The results indicated that the successful network structures were obtained with particle size ranged between 118 and 148 nm. In addition, high performance metal complexes were prepared with metal percentages about 6.55, 7.01 and 6.56 (wt%), in the case of Co, Ni and Fe, respectively. Moreover, thermal analysis revealed that hydrogen bonds played an important role for hydrogel networks formation.
Hyperbranched polyester
Chitosan
Miniemulsion
Metal complexes
hydrogels
2017
10
01
849
856
https://ejchem.journals.ekb.eg/article_3718_52e2bbaff2933b25b902deac8b5cb9ef.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2017
60
5
Thermal Stability Enhancement of Cotton and Cotton Polyester Blend Fabrics by Hyperbranched Poly Urethane-Urea Treatment
Karima
Haggag
Ahmed
Hashem
Fatma
El Shall
Despite the importance of cotton fabrics and its blends in our lives, the lack of their thermal stability is one of the most important point to be studied. The ability of hyperbranched poly urethane-urea (HBPU) to improve the thermal stability of cotton and cotton polyester (C/PET) fabrics was investigated. Different concentrations of HBPU were used for treatment of both cotton and C/PET fabrics. No significant effect on tensile strength properties was observed with cotton fabrics, while tensile strength of treated C/PET fabrics was affected by treatment with different concentrations of HBPU. TGA analysis shows enhanced char residue values with both treated cotton and C/PET fabrics. Polymer deposition on the surface of treated fabrics and structure changes were followed by SEM and FT-IR spectroscopy, respectively.
Hyperbranched polymer
Thermal stability
Thermo-gravimetric analysis (TGA)
textile finishing
2017
10
01
857
867
https://ejchem.journals.ekb.eg/article_3688_b032953e7ecfd49c5b7de910e9c470bf.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2017
60
5
The Combined Effect of ACE, TCF7L2, and PPARGC1A Gene Polymorphisms in Diabetic Nephropathy
Weaam
Gouda
Manal
Ismail
Olfat
Shaker
Esmat
Wahba
Heba
Yousif
Mie
Afify
Objective: This study was performed for investigation the relationship between variants of ACE, TCF7L2 and PPARGC1A gene polymorphisms individually or in combination with the development of nephropathy in T2DM. Subject and Methods: The study was included 85 T2DM patients (45 with nephropathy and 40 without nephropathy), and 45 healthy control subjects. The I/D polymorphism of ACE gene was evaluated by PCR method. The polymorphisms rs7903146 (C/T) of TCF7L2 gene and Gly482Ser (G/A) and Thr394Thr (G/A) of PPARGC1A gene were evaluated by PCR-RFLP analysis. Results: The frequency of ACE DD genotype and D allele was significantly higher in DN patients when compared to diabetic without nephropathy. The frequency of TCF7L2 rs7903146 TT genotype and T allele were significantly associated with DN patients compared to T2DM. Moreover, a significant association in A allelic frequencies was observed in DN cases compared to T2DM patients without nephropathy. No differences in the genotypic and allelic frequencies between T2DM patients with and without nephropathy were found for the Thr394Thr polymorphism. Conclusions: Our study suggested that candidate gene polymorphisms I/D of ACE, rs7903146 of TCF7L2 and Gly482Ser of PPARGC1A individually or in combination may act as susceptibility biomarkers for nephropathy in T2DM.
Diabetic nephropathy (DN)
Type 2 diabetes mellitus (T2DM)
Angiotensin-converting enzyme (ACE)
Transcription factor 7–like 2 (TCF7L2)
Peroxisome proliferator activated receptor gamma coactivator-1 alpha (PPARGC1A)
2017
10
01
869
881
https://ejchem.journals.ekb.eg/article_3754_fef4c0355a8019f97e3d0d4e0f36ace9.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2017
60
5
Genetic Variants of Interleukin-18 Promoter Gene in Coronary Artery Disease
Lamiaa
Mageed
Ibrahim H.
Borai
Nahla S.
Hassan
Olfat
Shaker
Esmat
Ashour
Mohammed
El Badrawy
Olfat M.
Fawzi
Background & objectives: Heart disease is impacted by ecological and inherited factors. Interleukin-18 (IL-18) is a pro-inflammatory cytokine that stimulates the immune reaction and induces the formation of atherosclerotic plaques. The aim of this study was to determine the relation between IL-18 promoter variants at (607C/A) and (137G/C) sites and coronary artery disease (CAD). Subjects & Methods: A sum of one hundred and twenty Egyptian patients (Sixty with CAD and sixty without CAD) and fifty healthy controls were consolidated into the study. Genotyping of IL18 promoter gene was investigated by PCR - Specific Sequence primer (PCR-SSP) technique . Results: The outcomes demonstrated that a significant association between lipid profiles and risk for CAD. At position-137, the recurrence of GG genotype was fundamentally connected with CAD. No qualifications in the genotypic and allelic frequencies amongst cases and controls were found for IL-18 (607C/A) promoter gene. Conclusion: A relationship between IL-18 (137G/C) promoter gene and vulnerability to CAD was proposed and it might serve as susceptibility biomarkers in the pathogenesis of atherosclerosis.
Coronary artery disease (CAD)
Inflammation
Interleukin-18 (IL-18)
Gene polymorphism
2017
10
01
883
891
https://ejchem.journals.ekb.eg/article_3753_54db104bb4a543775a239a17da977f4d.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2017
60
5
Influence of Bleaching Materials on Mechanical and Morphological Properties for Paper Conservation
Asmaa
Rushdy
Wafika
Noshy
Ahmed
Youssef
S.
Kamel
Old historical papers always are suffering from yellowing and darkness specifically after natural aging, so this study aim to evaluated some traditional bleaching materials that used in treatments of documents and books like hydrogen peroxide and sodium borohydride. Physical and chemical changes in paper sheets (cotton linter paper and book) before and after aging were studied such as color change, pH measurements, tensile strength, burst strength, FT-IR spectrum and scanning electron microscopy (SEM). The result pointed out that H2O2& NaBH4 lead to a significant improvement on mechanical properties of the historical paper. The effect of H2O2 and NaBH4 concentration, bleaching time and pH on paper sheet bleaching process were examined. Whiteness and yellowness results of the historical paper were evaluated for both bleaching methods. From this work it is clear that, it is not desirable to utilize bleaching agents for the treatment and conservation of ancient archaeological papers, but only in the essential cases they may be used in slight concentrations to treat yellowing, staining or stains
Historical Papers
bleaching
Hydrogen Peroxide
sodium borohydride
thermal aging
2017
10
01
893
903
https://ejchem.journals.ekb.eg/article_3717_62d571ed9039e2bbffee1f8bd639070d.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2017
60
5
Electrical and Mechanical Properties of Nitrile Rubber (NR) Filled with Industrial waste and by Product from Manufacture of Ferrosilicon Alloys in Egyptian Chemical Industries Company
Mostafa
Dief Allah
Ziad
Ali
Nehad
Rozik
Mohamed
Raslan
Kamal
U. Sadek
This work focused on using silica fume (by product) and quartz (industrial waste) in manufacture of ferrosilicon alloys in Egyptian chemical industries company (KIMA), in Aswan, Egypt. To reinforce the properties of Nitrile rubber, reduce cost and save the environment from industrial waste. Preparation rubber composites by addition different concentrations from silica fume filler (byproduct) and quartz filler (industrial waste). Investigation on the insulation properties of nitrile rubber composites by measurement of flashover voltage for unfilled nitrile rubber (blank) and nitrile rubber composites with silica fume filler and quartz filler. The measurement of flashover voltage for nitrile rubber composites occurred in different conditions (dry, wet, salinity and acidity). The effect of silica fume filler and quartz filler on mechanical properties of nitrile rubber was studied by investigation on elongation at break for nitrile rubber composites and also tensile strength. Studied the effect of hybrid filler on enhancement of electrical properties and mechanical properties of nitrile rubber, by addition different concentrations of mica filler on the samples showed the least enhancement in insulation properties of nitrile rubber composites in case of silica fume and quartz filler. And also study the morphology of nitrile rubber composites.
Nitrile rubber (NR)
insulation properties
Mechanical Properties
Quartz
Silica Fume
polymer insulators
hybrid filler
2017
10
01
905
918
https://ejchem.journals.ekb.eg/article_3828_a60ccc573d942c26ad85aea0658cbd6e.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2017
60
5
Reusing Limed Fleshing Wastes As A Fatliquor In Leather Processing
Ahmed
Nasr
Sulphated fatliquor was prepared from fats of sheep limed fleshing wastes to be used on small scale leather processing. The chemical properties of fats were determined before sulphation, thereafter they were neutralized with ammonium hydroxide to produce fatliquor. The chemical characteristics of the prepared fatliquor were then determined. The prepared fatliquor was applied onto light and heavy leather processing. Physical, chemical and organoleptic properties were determined, and scanning electron micrographs of finished leathers were obtained. The results showed that total fat content in sheep limed fleshing wastes constituted about 20% of its initial weight, of which unsaturated fats represented 60% and predominated as oleic acid. This indicates suitability of the prepared fatliquor for sheep leather processing. Additionally, the quality of finished leather processed by this technique is comparable to that obtained using a commercial fish oil-based fatliquor . These results imply that sulphated fatliquor derived from flesh waste can be reliably used in leather manufacturing as an appropriate alternative to traditional fatliquor to reduce tannery pollution and production costs.
Fleshing waste
fat
leather
tanning
sulphated
fatliquor
2017
10
01
919
928
https://ejchem.journals.ekb.eg/article_3544_1f6ef7a6d9ad1d71cfc79e529b77080d.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2017
60
5
Gatifloxacin assessment by the Enhancement of the Green Emission of Optical Sensor Tb3+ Doped In Sol-Gel Matrix
Mohamed
Attia
A.
Youssef
Ragaa
El Sheikh
W.
Mahmoud
Ahmed
Hefny
M.
Esam
A.
Saber
I.
Atef
A.
Ismael
M.
Esia
The efficiency of excited-state interaction between Tb3+ doped in sol- gel matrix and the industrial product Gatifloxacin (GFX) has been studied in different solvent and pHs. A high luminescence intensity peak at 545 nm of terbium- Gatifloxacin complex at λex=340 nm in acetonitrile was obtained. The photophysical properties of the green emissive Tb3+ complex doped in sol-gel matrix have been elucidated, the terbium was used as optical sensor for the assessment of Gatifloxacin in the pharmaceutical tablets and serum samples at pH 8.0 and λex = 340 nm with a concentration range of 5.0 ×10−9 - 1.0 ×10−6 mol L−1 for Gatifloxacin, correlation coefficient of 0.99 and detection limit of 1.65 ×10−9 mol L−1.
Gatifloxacin
terbium (III)
enhancing
Luminescence
Optical Sensor
sol-gel
2017
10
01
929
935
https://ejchem.journals.ekb.eg/article_3690_2125a21cd41a90ec9ac85c5f07f72361.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2017
60
5
Fire Performance of Poly Propylene Treated With Ammonium Polyphosphate and Kaolin
Adly
Hanna
Mohamed
Nour
Marwa
Sherief
Eglal
R.Souaya
Alaa
Abdelmoaty
Ammonium polyphosphate was prepared and used as flame retardant materials for polypropylene nanocomposites. Then, kaolin was incorporated with ammonium polyphosphate nanoparticles as synergistic flame retardant system for polypropylene. This is in addition to modification of kaolin with sulfuric acid then incorporated with polyphosphate nanoparticles as good flame retardant materials for polyproplylene. Flammability properties of polymer developed polymer nanocomposites were improved achieving 26.4 and 10.2 % reduction in peak heat release rate (PHRR) compared to virgin polymer and polymer composite with ammonium polyphosphate nanoparticles alone. The synergistic effect of modified kaolin and nanoparticles was evaluated. The dispersion of ammonium polyphosphate and kaolin in polymer matrix were studied using microscopic techniques.
Ammonium polyphosphate nanoparticles
kaolin
Cone calorimeter
flame retardant
polypropylene
2017
10
01
937
944
https://ejchem.journals.ekb.eg/article_3888_fed967f506a918a31aca3524c30826e4.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2017
60
5
Evaluation the Using of Nano Materials as Self Cleaning Agents of Different Kinds of Stained Archeological Textiles
Eman
Osman
Saher Fawzy
Ibrahim
Dalia
Essa
Nano-sized TiO2 and ZnO have demonstrated efficiency in many application fields due to their photocatalytic features that provide self cleaning properties to the materials with simple and non-expensive procedures. Recently, nano TiO2 and nano ZnO started to be embedded in the archeological field of stones and wood, while there is a lack of information about using in ancient textile artifacts. So this work aimed to investigate the effectiveness of both TiO2 and ZnO as potential self cleaning agents for three different types of stains (pomegranate extract, linseed oil and pencilium fungi stains) applied on linen fabric samples. Two groups of the satins, i.e. old s and new occurring stains were applied on the fabric samples and studied under the effect of either nano TiO2 or nano ZnO. The prepared stained samples were characterized using FTIR-ATR, static contact angle calculation and photocatalytic activity. The photocatalytic behavior of the treated samples was investigated through measuring the color parameters (L, a & b) according to CIELAB. Photocatalytic performance was judged by assessing the color difference of the tested samples after each treatment. The results revealed that the best behavior in terms of hydrophobicity and self-cleaning properties were shown by the nano ZnO treated stained samples.
Nano metal oxides
photocatalytic behavior
Contact angle
linseed oil
Pomegranate extract
fungi
archeological textiles
2017
10
01
945
956
https://ejchem.journals.ekb.eg/article_3841_0ed91f13a8266d02c96c560a3748d3b0.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2017
60
5
Relationship between Sex Hormone-Binding Globulin (SHBG) and Insulin-Like Growth Factor-I (IGF-I) with Metabolic Syndrome
Weaam
Gouda
Lamiaa
Mageed
Esmat
Wahba
Mie
Afify
Mona
Awad
Said
Shalaby
Wafaa
Ezzat
Yehia
Shaker
Background: Glucose intolerance, insulin resistance, hypertension, visceral obesity, and dyslipidemia are the major components of metabolic syndrome (MS). Aim: To evaluate the association between serum SHBG and IGF-1 levels and the risk of MS. Furthermore, to determine the correlations between SHBG and IGF-1 and the main components of MS. Subjects and Methods: A total of 402 subjects with and without MS were enrolled in this study (MS=156, Non-MS=246) aged > 18 years. The age, height, weight, BMI, HC, WC, and incidence of diabetes, hypertension and dyslipidemia of all cases were recorded. The collected serum samples were used to assess lipid profile, glucose and insulin levels. The levels of LDL-cholesterol were calculated using Friedewald’s formula. Insulin resistance was measured (as HOMA score). The levels of serum SHBG and IGF-1 were measured using Elisa technique. Results: A positive relationship between SHBG and MS was detected , however no such correlation was observed concerning IGF-1. There were positive correlations between SHBG and main components of MS; with insulin, HOMA-index, TC, TG and HDL . Conversely, IGF-1showed negative correlations. Finally, SHGB was more sensitive (63.5%), accurate (61.9%) than IGF-1 (51.9%), accuracy (59%) . Conclusion: Our study reveals that lower SHBG is more strongly associated with metabolic syndrome and its main components than lower IGF-1. SHBG could be the essential driver of these relations, conceivably reflecting its association with insulin sensitivity, however, more studies are required to confirm this relationship.
Key words: Metabolic syndrome (MS)
Sex hormone-binding globulin (SHBG)
Insulin like growth factor-1 (IGF-1)
Insulin resistance(IR)
2017
10
01
957
964
https://ejchem.journals.ekb.eg/article_3995_11da84bf12869223f74c5691f7bea08e.pdf