Advanced Technologies and New Materials Research Institute ATNMRI

Alexandria, Egypt

Advanced Technologies and New Materials Research Institute ATNMRI

Alexandria, Egypt
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Tamer T.M.,Advanced Technologies and New Materials Research Institute ATNMRI | Tamer T.M.,Institute of Experimental Pharmacology and Toxicology | Hassan M.A.,Genetic Engineering and Biotechnology Research Institute GEBRI | Omer A.M.,Advanced Technologies and New Materials Research Institute ATNMRI | And 5 more authors.
Carbohydrate Polymers | Year: 2017

Cinnamaldehyde was immobilized to O-amine functionalized chitosan via a coupling reaction. Fourier transform infrared spectroscopy confirmed N-cinnamyl substitution. Wetting analyses demonstrate more hydrophobicity in the N-cinnamyl substituted O-amine functionalized chitosan compared to chitosan or unsubstituted O-amine functionalized chitosan. Thermal gravimetric analysis and differential scanning calorimetry demonstrates that the prepared N-cinnamyl substituted O-amine functionalized chitosan exhibits higher thermostability than unmodified chitosan at temperatures in which polysaccharides are commonly stored and utilised. The N-cinnamyl substituted O-amine functionalized chitosan, against four different bacteria strains [two gram-positive (Staphylococcus aureus and Bacillus cereus) and two gram-negative (Escherichia coli and Pseudomonas aeruginosa)], displays promotion of inhibition activity against these bacterial strains. Finally, the antioxidative activity of the N-cinnamyl substituted O-amine functionalized chitosan was compared with those activities of chitosan and O-amine functionalized chitosan. This was evaluated by uninhibited and inhibited hyaluronan degradation and ABTS assay. The N-cinnamyl substituted O-amine functionalized chitosan shows a lower activity towards donating a hydrogen radical compared to chitosan or O-amine functionalized chitosan. On the other hand, the N-cinnamyl substituted O-amine functionalized chitosan exhibited a higher ability to scavenge the ABTS[rad]+ cation radical compared to chitosan and O-amine functionalized chitosan. © 2017 Elsevier Ltd


Mohy Eldin M.S.,University of Jeddah | Mohy Eldin M.S.,Advanced Technologies and New Materials Research Institute ATNMRI | Ammar Y.A.,Al - Azhar University of Egypt | Tamer T.M.,Advanced Technologies and New Materials Research Institute ATNMRI | And 2 more authors.
Desalination and Water Treatment | Year: 2017

The present work was undertaken to prepare low-cost oil adsorptive materials based on chitosan and its derivatives. Chitosan was prepared from chitin which firstly extracted from shrimp shells. Nonanyl and aminated chitosan derivatives were also prepared and verified their structures, thermal stability and the morphological changes using FT-IR spectroscopy, TGA/DSC, and SEM respectively. Results showed maximum ion exchange capacity (IEC) value was recorded in case of aminated chitosan (7.6 meq/g), while lower IEC value was obtained for nonanyl chitosan schiffbase (2.5 meq/g). Furthermore, the contact angle data indicates that nonanyl chitosan schiffbase exhibit hydrophobic and oleophilic characters and recorded maximum values at 127°, 36° using water and crude oil droplet. The observed improvement in oil/organic solvent/ and water selectivity verified also the chemical medications in addition to the change of the physical properties of chitosan surface. Finally, from the oil adsorption study, it has noticed that the oil adsorption capacity increased from 0.2 g/g in the case of chitosan to 5.1 g/g in the case of nonanyl chitosan schiffbase using heavy crude oil. While, only 9% of water could be uptake by nonanyl chitosan compared to 250.7% and 360% using chitosan and aminated chitosan. The increment of oil adsorption capacity also associated with increasing the oil viscosity in the following order; gas oil < mobil oil < light crude oil < heavy crude oil. The successful modification processes and the cheapness of the prepared materials make them acts as promising adsorbents for oil spill removal technology. © 2017, Desalination Publications. All rights reserved.


Abdelrazik T.M.,Advanced Technologies and New Materials Research Institute ATNMRI | Abdelrazik T.M.,Institute of Experimental Pharmacology and Toxicology | Valachova K.,Institute of Experimental Pharmacology and Toxicology | Mohyeldin M.S.,University of Jeddah | Soltes L.,Institute of Experimental Pharmacology and Toxicology
Journal of Applied Pharmaceutical Science | Year: 2016

In this study, new cinnamyl chitosan schiff base was evaluated as antioxidant material. Antioxidant activity was measured by two different popular methods (uninhibited/inhibited hyaluronan degradation and decolorization of ABTS methods). the results show decrease the hydrogen donation behavior of chitosan after coupling with cinnamaldehyde, in the other hand, ABTS method show increase the electron donation activity of cinnamyl chitosan than the chitosan itself. © 2016 Tamer Mahmoud Abdelrazik et al.


Omer A.M.,Advanced Technologies and New Materials Research Institute ATNMRI | Tamer T.M.,Advanced Technologies and New Materials Research Institute ATNMRI | Hassan M.A.,Genetic Engineering and Biotechnology Research Institute GEBRI | Rychter P.,Jan Dlugosz University in Czestochowa | And 2 more authors.
International Journal of Biological Macromolecules | Year: 2016

A new amphoteric biopolymer carrier based on alginate and aminated chitosan coated microbeads (Alg/AmCS) was developed and characterized for bovine serum albumin (BSA) protein delivery. The amphoteric character was investigated through studying the swelling and in vitro BSA release behaviors of the developed microbeads in simulated gastric (SGF; pH1.2), intestinal (SIF; pH6.8), and colonic (SCF; pH7.4) fluids. The pH sensitivity was found to depend on the amount of AmCS in the coating medium. The results were interpreted from the view of the individual pH sensitivity of alginate and aminated chitosan in addition to the ionic interaction between them under the studied pHs. Besides; it was found that the BSA loading efficiency (LE) exceeded 82% regardless of the initial concentration of BSA. The released amount of BSA reached approximately 63% and 86% in SIF and SCF, respectively, using 0.25% AmCS. The stability of alginate microbeads in SCF was improved with increasing AmCS concentration in the coating medium up to 2%. Furthermore, the developed microbeads demonstrated their ability for biodegradation in addition to their antibacterial activities against selected bacterial strains. The results clearly suggested that Alg/AmCS coated microbeads could be suitable carriers for site-specific protein delivery in the intestinal and colon tracts. © 2016 Elsevier B.V.


Valachova K.,Slovak Academy of Sciences | Tamer T.M.,Advanced Technologies and New Materials Research Institute ATNMRI | Eldin M.M.,Advanced Technologies and New Materials Research Institute ATNMRI | Eldin M.M.,University of Jeddah | Soltes L.,Slovak Academy of Sciences
Chemical Papers | Year: 2016

Since chitosan and its amino-, cinnamo- or cinnamo-amino- derivatives are acid-soluble, the effect of acetic acid on hyaluronan (HA) macromolecules degraded by Cu(II) ions and ascorbate was examined to produce reactive oxygen species (ROS). Further, the effects of glutathione (GSH), chitosan and its derivatives, added individually or in combination, on the quenching of ROS and ABTS•+ cation radical were examined using rotational viscometry and ABTS assay, respectively. The results of the rotational viscometry indicated a rapid degradation of HA by ROS after the addition of acetic acid. Chitosan and its derivatives moderately decreased the rate of HA degradation, while GSH decreased the rate of HA degradation more significantly. Moreover, GSH enhanced the protection of HA macromolecules against their degradation in the presence of chitosan or its derivatives. The results of the ABTS assay confirmed the results of the rotational viscometry. The GSH in the combination with chitosan and its derivatives reduced ABTS•+ more intensively than when added individually. © 2016 Institute of Chemistry, Slovak Academy of Sciences.


Abu-Saied M.A.,Advanced Technologies and New Materials Research Institute ATNMRI | Abu-Saied M.A.,King Saud University | Khalil K.A.,King Saud University | Khalil K.A.,South Valley University | Al-Deyab S.S.,King Saud University
International Journal of Electrochemical Science | Year: 2012

Electrospinning is a very simple and versatile process by which polymer nanofibers with diameters ranging from a few nanometers to several micrometers (usually between 50 and 500 nm) can be produced using an electrostatically driven jet of polymer solution (or polymer melt). Significant progress has been made in this process throughout the past few years and the resultant nanostructures have been exploited to a wide range of applications. This work concerns preparation of poly vinyl acetate Nanofiber doping Cupper by using Electrospun Technique to use in different applications. The surface morphology of poly vinyl acetate Nanofiber doping Cupper was investigated by SEM and Chemical changes have been performed through characterization followed by using FTIR, TGA analysis. © 2012 by ESG.


Abu-Saied M.A.,Advanced Technologies and New Materials Research Institute ATNMRI | Fontananova E.,CNR Institute on Membrane Technology | Drioli E.,CNR Institute on Membrane Technology | Mohy Eldin M.S.,Advanced Technologies and New Materials Research Institute ATNMRI
Journal of Polymer Research | Year: 2013

This work explores novel application of sulphonated Poly (Glycidyl Methacrylate) grafted cellophane membranes as polyelectrolyte membranes in direct methanol fuel cells (DMFC) for the first time. Cellophane membranes were grafted first with Poly (Glycidyl Methacrylate), and then the introduced epoxy groups were converted to sulfonic ones. Grafting and sulphonation processes were verified using FTIR and TGA analysis. Morphological characterization was followed using SEM analysis. Essential characters required for polyelectrolyte fuel cell membrane especially IEC, ionic conductivity, methanol permeability, thermal stability and high mechanical properties were investigated. IEC in the range of 1.02-2.55 meq/g compared to 0.9 meq/g per Nafion 117 was obtained. Nafion ionic conductivity, 0.03880 Scm-1, is 4.4 times of sulphonated PGMA grafted cellophane membrane (GP%; 198); 0.00880 Scm-1. The conductance show a comparable results which Nafion conductance, 1.393 Scm -2, is only 1.65 times of sulphonated PGMA grafted cellophane membrane; 0.847 Scm-2. It is worthy to mention here that the methanol permeability for Nafion membrane is 3.39 × 10-6 (cm 2 s) 8.5 folds higher than the minimum value of the sulphonated PGMA grafted cellophane membrane. The obtained results are very promising and opening new area for conducting further investigations considering the very low price of cellophane compared to Nafion. © 2013 Springer Science+Business Media Dordrecht.


Eldin M.S.M.,Advanced Technologies and New Materials Research Institute ATNMRI | Abu-Saied M.A.,Advanced Technologies and New Materials Research Institute ATNMRI | Elzatahry A.A.,Advanced Technologies and New Materials Research Institute ATNMRI | El-Khatib K.M.,National Research Center of Egypt | And 2 more authors.
International Journal of Electrochemical Science | Year: 2011

Novel acid-base poly vinyl chloride -doped ortho-phosphoric acid membranes for prospective fuel cells (DMFC) applications were prepared for the first time. Base polymers were prepared first through amination using ethylene daimine (EDA). The base aminated PVC membranes were consequently doped with ortho-phosphoric acid (OPA). The later are significantly contributed to enhance ion exchange capacity (IEC) and thermal stability. Changes of chemical structure were verified through FT-IR, and TGA characterization. As a result, the thickness and the water uptake of acid-base prepared membranes were increased with increase of doped OPA concentration comparing with original PVC membrane. Maximum water uptake of 105(%) and 3.41 (meq/g) IEC were obtained. This makes the prepared acid-base PVC-doped OPA membranes promising and attractive new materials in fuel cells applications. © 2011 by ESG.


Abu-Saied M.A.,Advanced Technologies and New Materials Research Institute Atnmri | Abu-Saied M.A.,King Saud University | Abdel-Halim E.S.,National Research Center of Egypt | Abdel-Halim E.S.,King Saud University | And 3 more authors.
International Journal of Electrochemical Science | Year: 2013

Acrylonitrile (AN) was homopolymerized to polyacrylonitrile (PAN) using potassium persulphate as an initiator. The cyano groups of AN chains were iminated through treating AN with polyethyleneimine (PEI) in an aqueous solution. Iminated polyacrylonitrile (IPAN), characterized by chemical analysis, fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and thermogravimetric analysis (TGA) studies, was used as an adsorbent for the removal of Methylene Blue (MB) dye from its aqueous solutions. All factors affecting the adsorption of MB onto the adsorbent IPAN, like agitation duration, temperature, adsorbent dose and the initial concentration of dye solution were extensively studied. Two adsorption isotherm models, namely Langmuir model and Freundlich model were applied to the adsorption data. The adsorption data fitted well to both models. The Langmuir adsorption capacity (Qo) was found to be 54 mg/g. Freundlish constants, KF and n, were found to be 1.459 and 1.7, respectively. The results of the desorption study show that 92% of the adsorbed dye could be desorbed when shaking the dye-loaded adsorbent with distilled water for three hours at 40°C. © 2013 by ESG.


Tamer T.M.,Advanced Technologies and New Materials Research Institute ATNMRI | Tamer T.M.,Slovak Academy of Sciences
Interdisciplinary Toxicology | Year: 2013

Synovial fluid is a viscous solution found in the cavities of synovial joints. The principal role of synovial fluid is to reduce friction between the articular cartilages of synovial joints during movement. The presence of high molar mass hyaluronan (HA) in this fluid gives it the required viscosity for its function as lubricant solution. Inflammation oxidation stress enhances normal degradation of hyaluronan causing several diseases related to joints. This review describes hyaluronan properties and distribution, applications and its function in synovial joints, with short review for using thiol compounds as antioxidants preventing HA degradations under inflammation conditions. Copyright © 2013 SETOX & IEPT, SASc.

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