Time filter

Source Type

Hajibeygi M.,Islamic Azad University at Varamin | Shabanian M.,Islamic Azad University of Arak
Journal of Applied Polymer Science | Year: 2012

In this article, we have successfully synthesized a new dicarboxylic acid, from the two step reactions. At first 4,4'-bis(1,2-diphenoxyethane) dialdehyde was synthesized from 1,2-dibromoethane and 4-hydroxybenzaldehyde, then 4,4'-bis(1,2-diphenoxyethane) diacrylic acid was synthesized from 4,4'-bis(1,2-diphenoxyethane) dialdehyde and malonic acid in a solvent free reaction. Four new organosoluble and thermally stable polyamides (PAs) with good inherent viscosities containing photosensitive groups were synthesized from the direct polycondensation reaction of 4,4'-bis(1,2-diphenoxyethane) diacrylic acid with four various aromatic diamines containing photosensitive group, by two different methods such as direct polycondensation in a medium consisting of N-methyl-2-pyrrolidone (NMP)/triphenyl phosphite (TPP)/calcium chloride (CaCl 2)/pyridine (Py) and direct polycondensation in a tosyl chloride (TsCl)/pyridine (Py)/N,N-dimethylformamide (DMF) system. All of the above polymers were fully characterized by 1H-NMR, FTIR, gel permeation chromatography (GPC), elemental analysis, inherent viscosity, solubility tests, UV-vis spectroscopy, differential scanning calorimeter (DSC), thermogravimetric analysis (TGA). The resulted polyamides (PAs) have showed admirable good inherent viscosities, thermal stability and solubility. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012 Copyright © 2012 Wiley Periodicals, Inc.


Davoodi H.,Shahid Beheshti University of Medical Sciences | Esmaeili S.,Islamic Azad University at Varamin | Mortazavian A.M.,Shahid Beheshti University of Medical Sciences
Comprehensive Reviews in Food Science and Food Safety | Year: 2013

Milk is considered to be the only foodstuff that contains approximately all different substances known to be essential for human nutrition. In terms of cancer risk, dairy foods have been reported as both protective and occasionally as harmful. The evidence that dairy foods can protect against cancer, or increase the risk of cancer is not conclusive. Overall, the proven health benefits of dairy foods greatly outweigh the unproven harm. Dairy foods should be encouraged as part of a varied and nutritious diet as they are essential to maintain good bone and dental health, to prevent osteoporosis, major cardiovascular disease risk factors, hypertension, type-2 diabetes, metabolic syndromes, as well as some cancers. The Cancer Council and USDA recommend 3 servings of milk and milk products daily. This article reviews the potential of milk and milk products (its indigenous or exogenous compounds) to inhibit different cancer risks. Also reviewed are the reports over the years that have suggested milk and the dairy industry as responsible agents for causing cancer. © 2013 Institute of Food Technologists®.


Farhadyar N.,Islamic Azad University at Varamin | Sadjadi M.S.,Islamic Azad University at Tehran
Journal of Biomedical Nanotechnology | Year: 2011

In this work, we report enhancement of the stability and biocatalytic activities of the alkaline protease enzyme immobilized on a gold/TiO 2 core-shell nanowires. Gold/TiO 2 core-shell nanowires were firstly prepared by the sol-gel method using a mixture of aqueous solution of titanate and chloroauric acid (HAuCl 4) under ambient temperature and atmospheric condition and calcined then. As prepared nanowire was found to have a good surface biocompatibility for immobilization of the alkaline protease enzyme. The results obtained in this work showed that alkaline protease immobilized on gold-TiO 2 core shell is stable and bioactive at the alkaline pH and ambient temperature. The stability and the biocatalytic activity of the immobilized gold-TiO 2 core shell nano composites were monitored by UV-visible spectroscopy. Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM) and dispersive analysis of X-ray (EDAX) were used to characterize the size and morphology of the prepared materials. Copyright © 2011 American Scientific Publishers. All rights reserved.


Moghimi A.,Islamic Azad University at Varamin
E-Journal of Chemistry | Year: 2011

Modified nano polyacrylonitrile fiber (PANF) was prepared by adding acrylic fibers to methanolamine (MMA) with different concentration solutions. The stability of a chemically modified nano polyacrylonitrile fiber especially in concentrated hydrochloric acid which was then used as a recycling and pre-concentration reagent for further uses of modified nano polyacrylonitrile fiber. The application of this modified nano polyacrylonitrile fiber for sorption of a series of metal ions was performed by using different controlling factors such as the pH of metal ion solution and the equilibration shaking time by the static technique. Cr(III) was found to exhibit the highest affinity towards extraction by these modified nano polyacrylonitrile fiber phases. The pronounced selectivity was also confirmed from the determined distribution coefficient (Kd) of all the metal ions, showing the highest value reported for Cr(III) to occur by modified nano polyacrylonitrile fiber. The modified nano polyacrylonitrile fiber for selective extraction of Cr(III) were successfully accomplished in aqueous solution as well as preconcentration of low concentration of Cr(III) (60 pg mL-1) from natural tap water with a preconcentration factor of 100 for Cr(III) and then off-line Cr(III) in water samples were determined by flame atomic absorption.


Shahab Lavasani A.R.,Islamic Azad University at Varamin
Advances in Environmental Biology | Year: 2014

The aim of this research was to determine the survival of B.lactis and the effect of acidity development and salt concentration inLighvan cheese on the viability of B. lactis. This type of cheese is produced from ewe milk or the mix of ewe and goat. The effect of time on survival of B. lactis during the ripening of probiotic Lighvan cheese was significant (p<0.05). B. lactis cells survived in cheese samples at concentrations up to 6.84 log10 cfu/g for at least 60 days of storage time at 4 °C. High concentration of salt and acid production from fermentation decreased viability of B.lactis during ripening of Lighvan cheese. © 2014 AENSI Publisher All rights reserved.


Moghimi A.,Islamic Azad University at Varamin
Russian Journal of Physical Chemistry A | Year: 2013

A novel and selective method for the fast determination of trace amounts of Cu(II) ions in water samples has been developed. The first organic-solution- processable functionalized-graphene (SPF-Graphene) hybrid material with porphyrins, porphyrin-graphene nanohybrid, 5-(4-aminophenyl)-10, 15, 20-triphenyl porphyrin and its photophysical properties including optical (TPP) and grapheme oxide molecules covalently bonded together via an amide bond (TPP-NHCO-SPFGraphene) were used as absorbent for extraction of Cu(II) ions by solid phase extraction method. The complexes were eluted with HNO3 (2 M) 10% (vol/vol) methanol in acetone and determined the analyte by flame atomic absorption spectrometry. The procedure is based on the selective formation of Cu(II) at optimum pH by elution with organic eluents and determination by flame atomic absorption spectrometry. The method is based on complex formation on the surface of the ENVI-18 DISK™ disks modified porphyrin-graphene nanohybrid, 5-(4-aminophenyl)-10,15,20-triphenyl porphyrin (TPP) and grapheme oxide molecules covalently bonded together via an amide bond (TPP-NHCO-SPFGraphene) followed by stripping of the retained species by minimum amounts of appropriate organic solvents. The elution is efficient and quantitative. The effect of potential interfering ions, pH, TPP-NHCO-SPFGraphene, amount, stripping solvent, and sample flow rate were also investigated. Under the optimal experimental conditions, the break-through volume was found to about 1000 mL providing a preconcentration factor of 600. The maximum capacity of the disks was found to be 398 ± 3 μg for Cu2+. The limit of detection of the proposed method is 5 ng per 1000 mL. The method was applied to the extraction and recovery of copper in different water samples. © 2013 Pleiades Publishing, Ltd.


Khederzadeh S.,Islamic Azad University at Varamin
African Journal of Biotechnology | Year: 2011

In modern programs of animal breeding, the genetic polymorphisms of production traits can be used as marker systems. Calpastatin gene is located on ovine chromosome 5 and is polymorphic in many breeds of sheep. Calpastatin has a role in meat tenderness after slaughter. Blood samples were collected from 120 crossbreeds of Dalagh sheep located in Golistan province of Iran. Genomic DNA was extracted from blood sample. Gel monitoring and spectrophotometer methods were used to determine the quality and quantity of DNA. Intron I from L domain of the ovine calpastatin gene was amplified to produce a 565 bp fragment. The PCR products were digested by restriction endonucleases MspI. Digested products were separated by electrophoresis on 1.5% agarose gel and visualized after staining with ethidium bromide on UV transillumination. The MspI digestion of the PCR products produced digestion fragments of 306 and 259 bp. Data analysis was done using PopGen32 software. In this population, MM, MN and NN genotype were identified with 65.5, 29, 5.5% frequencies, respectively. The population was found to follow Hardy-Weinberg equilibrium. © 2011 Academic Journals.


Hajibeygi M.,Islamic Azad University at Varamin | Shabanian M.,Islamic Azad University
Designed Monomers and Polymers | Year: 2013

A series new thermally stable and organosoluble polyamides (PAs) 5a-f and copolyamides 10a-f with good inherent viscosities were synthesized from the direct polycondensation reaction of 1,2-bis(4-carboxyphenoxy)ethane 3 with aromatic diamines 4a-f and from the diacid 3 as a first diacid monomer and 4,4′-bis(1,3-diphenoxypropane) diacrylic acid 9 as a second diacid monomer with aromatic diamines 4a-f, respectively. The dicarboxylic acid 9 was synthesized from the two step reactions. At first 4,4′-bis(1,3- diphenoxypropane) dialdehyde 8 was synthesized from 1,3-dibromopropane 6 and 4-hydroxybenzaldehyde 7, then 4,4′-bis(1,2-diphenoxyethane) diacrylic acid 9 was synthesized from dialdehyde 8 and malonic acid in a solvent free reaction. All of the above polymers were fully characterized by 1H NMR, Fourier transform infrared, elemental analysis, inherent viscosity, solubility tests, differential scanning calorimeter, thermogravimetric analysis, and derivative of thermogravimetric. The resulted PAs have shown admirable good inherent viscosities and thermal stability and solubility. Copyright © 2012 Taylor & Francis.


Farahmandjou M.,Islamic Azad University at Varamin
Acta Physica Polonica A | Year: 2013

In this study, Fe and Pt nanoparticles are first synthesized by decomposition of iron(II) chloride tetrahydrate and reduction of platinum(II) acetylacetonate. Then, FePt nanoparticles are similarly fabricated by adding Li- BEt3H to the phenyl ether solution in the presence of oleic acid, oleylamine surfactant at 100°C, followed by refiuxing at 255 °C. The samples were characterized by transmission electron microscopy and energy dispersive spectroscopy analyses after heat treatments. Transmission electron microscopy images show that self-assembled 8 nm Fe nanoparticles are formed as polygon shape, whereas Pt nanoparticles have broad size distribution. On the other hand, 4.5 nm FePt nanoparticles have standard division about 9%. The results of energy dispersive spectroscopy analysis reveal that the composition of Pt, Fe and FePt nanoparticles gives Fe56Pt44 stoichiometry.


Farahmandjou M.,Islamic Azad University at Varamin
Journal of Superconductivity and Novel Magnetism | Year: 2012

FePt magnetic nanoparticles have been synthesized by superhydride reduction of FeCl 2 and Pt(acac) 2 at high temperature. Adding superhydride (LiBEt3H) to the phenyl ether solution of FeCl 2 and Pt(acac) 2 in the presence of oleic acid, oleylamine, and 1,2-hexadecanediol at 190°C, followed by refluxing at 245°C, led to monodisperse 3.5 nm FePt nanoparticles. The effect of oleylamine and oleic acid surfactants on the nucleation and growth of FePt nanoparticles were studied. The size of Pt was controlled by oleylamine surfactant in nucleation stage. To prevent sintering of the FePt nanoparticles, oleic acid surfactant was used in growth stage. The energy dispersive spectroscopy results revealed that the particle composition was first Fe11Pt89 in nucleation stage and after adding superhydride the composition changed to Fe63Pt37 in growth stage. The structural and magnetic measurements indicated that the L10 structure of FePt nanoparticles is formed after annealing and the coercivity of superlattice FePt nanoparticles increases to 7.5 kOe after heat treatments. © Springer Science+Business Media, LLC 2012.

Loading Islamic Azad University at Varamin collaborators
Loading Islamic Azad University at Varamin collaborators