نتایج جستجو برای: chitosan

تعداد نتایج: 17212  

2013
K. Kamala

Preparation and characterization of water soluble chitosan was examined for their antibacterial activity from P. stylifera. The yield of crude chitosan and water soluble chitosan was 54.3 % and 87.8%. The FT-IR spectrum of chitin, chitosan and water soluble chitosan also determined and characterization was done and compared with standards. Compare to other bacterial strains S.auerus (18.3mm) ha...

2011
Dariusz Wawro Luciano Pighinelli

This paper describes a method for preparing chitosan fibers modified with hydroxyapatite (HAp), tricalcium phosphate (β-TCP), and HAp/β-TCP nanoparticles. Fiber-grade chitosan derived from the northern shrimp (Pandalus borealis) and nanoparticles of tricalcium phosphate (β-TCP) and hydroxyapatite (HAp) suspended in a diluted chitosan solution were used in the investigation. Diluted chitosan sol...

Journal: :BMC Biotechnology 2008
XingYi Li XiangYe Kong Shuai Shi XiuLing Zheng Gang Guo YuQuan Wei ZhiYong Qian

BACKGROUND Absorption of antigens onto chitosan microparticles via electrostatic interaction is a common and relatively mild process suitable for mucosal vaccine. In order to increase the stability of antigens and prevent an immediate desorption of antigens from chitosan carriers in gastrointestinal tract, coating onto BSA loaded chitosan microparticles with sodium alginate was performed by lay...

2013
Ping-Ping Zuo Hua-Feng Feng Zhi-Zhen Xu Ling-Fan Zhang Yu-Long Zhang Wei Xia Wen-Qing Zhang

BACKGROUND Graphene oxide (GO)can be dispersed through functionalization, or chemically converted to make different graphene-based nanocomposites with excellent mechanical and thermal properties. Chitosan, a partially deacetylated derivative of chitin, is extensively used for food packaging, biosensors, water treatment, and drug delivery. GO can be evenly dispersed in chitosan matrix through th...

2013
Mohamed H. M. Hussein Mohamed F. El-Hady Hassan A. H. Shehata Mohammad A. Hegazy Hassan H. H. Hefni

Chitosan is one of the important biopolymers and it is extracted from exoskeletons of crustaceans in sea food waste. It is a suitable eco-friendly carbon steel corrosion inhibitor in acid media; the deacetylation degree of prepared chitosan is more than 85.16 %, and the molecular weight average is 109 kDa. Chitosan was modified to 2-N,N-diethylbenzene ammonium chloride N-oxoethyl chitosan (comp...

2013
Rapeepun Chalongsuk Namfon Sribundit

Chitosan has varieties of applications in both pharmaceutical and cosmetic products. To explore the situation of chitosan awareness and usage in Thailand is an essential information for product development from chitosan. Entrepreneurs or their representatives from GMP certified pharmaceutical and cosmetic manufacturers were interviewed during June 2007 to February 2008. One hundred and five fro...

Journal: :Biochemical and biophysical research communications 2009
Tsung-Lin Yang Tai-Horng Young

Chitosan has been shown to be effective in regulating progenitor salivary tissue morphogenesis, however, the specificity of chitosan effects remains unclear. To assess the regulatory ability of chitosan in salivary gland morphogenesis, progenitor salivary tissue from embryonal submandibular gland (SMG) was cultured in chitosan-containing medium. It was found that soluble chitosan was able to pr...

Journal: :Molecules 2011
Ying-Chien Chung Jan-Ying Yeh Cheng-Fang Tsai

The antibacterial activity of water-soluble chitosan derivatives prepared by Maillard reactions against Staphylococcus aureus, Listeria monocytogenes, Bacillus cereus, Escherichia coli, Shigella dysenteriae, and Salmonella typhimurium was examined. Relatively high antibacterial activity against various microorganisms was noted for the chitosan-glucosamine derivative as compared to the acid-solu...

Journal: :Circulation 2015
Anton Mihic Zhi Cui Jun Wu Goran Vlacic Yasuo Miyagi Shu-Hong Li Sun Lu Hsing-Wen Sung Richard D Weisel Ren-Ke Li

BACKGROUND Efficient cardiac function requires synchronous ventricular contraction. After myocardial infarction, the nonconductive nature of scar tissue contributes to ventricular dysfunction by electrically uncoupling viable cardiomyocytes in the infarct region. Injection of a conductive biomaterial polymer that restores impulse propagation could synchronize contraction and restore ventricular...

Journal: :International journal of food microbiology 2001
I M Helander E L Nurmiaho-Lassila R Ahvenainen J Rhoades S Roller

The mode of antimicrobial action of chitosan (polymeric beta-1,4-N-acetylglucosamine) on gram-negative bacteria was studied with special emphasis on its ability to bind to and weaken the barrier function of the outer membrane (OM). Chitosan (250 ppm) at pH 5.3 induced significant uptake of the hydrophobic probe 1-N-phenylnaphthylamine (NPN) in Escherichia coli, Pseudomonas aeruginosa and Salmon...

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