Results 211 to 220 of about 65,504 (254)
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International Journal of Biological Macromolecules, 2009
Chitosan, carboxymethyl chitosan (CMCS) and chitosan sulfates (CSS) with different molecular weight were modified by reacting with 4-hydroxyl-5-chloride-1,3-benzene-disulfo-chloride or 2-hydroxyl-5-chloride-1,3-benzene-disulfo-chloride to give 12 kinds of new hydroxylbenzenesulfonailides derivatives of them.
Zhimei Zhong +3 more
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Chitosan, carboxymethyl chitosan (CMCS) and chitosan sulfates (CSS) with different molecular weight were modified by reacting with 4-hydroxyl-5-chloride-1,3-benzene-disulfo-chloride or 2-hydroxyl-5-chloride-1,3-benzene-disulfo-chloride to give 12 kinds of new hydroxylbenzenesulfonailides derivatives of them.
Zhimei Zhong +3 more
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Thermogravimetric studies of chitosan derivatives
Thermochimica Acta, 1992Abstract The thermal stabilities of chitosan derivatives (chito; 2-amino-2-deoxy(1-4)-β- D -glucopyranan) have been studied by thermogravimetry (TG) between 25 and 550 °C under nitrogen flow. The kinetic data thus obtained indicate that the thermostabilities decrease in the order, chito-salicylaldehyde > chito-thioglycolic acid > chito > chito ...
CARDENAS, G, BERNAL, L, TAGLE, LH
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Chitosan and Derivatives: Bioactivities and Application in Foods
Annual Review of Food Science and Technology, 2021Chitosan is a biodegradable, biocompatible, and nontoxic aminopolysaccharide. This review summarizes and discusses the structural modifications, including substitution, grafting copolymerization, cross-linking, and hydrolysis, utilized to improve the physicochemical properties and enhance the bioactivity and functionality of chitosan and related ...
Fa-Wen Yin +6 more
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Interaction of dyes with chitosan derivatives
Journal of Applied Polymer Science, 1989AbstractThe states of water in N‐acylated, both aliphatic and aromatic, chitosan gels were investigated by DSC technique. The amounts of two states of water, freezable and nonfreezable water, were found to depend on the chemical and physical structure of the gels.
Takaki Kanbara +3 more
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Inactivation of coliphages by chitosan derivatives
Microbiology, 2000The effect of chitosan fragments with different degrees of polymerization and the chemical derivatives of chitosan differing in the number of amino groups and total molecule charge on phages T2, T4, and T7 was studied. The interaction of chitosan with bacteriophage particles inactivated them to the extent dependent on the chemical properties of ...
Z. M. Kochkina +2 more
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Environmental Applications of Chitosan and Its Derivatives
2014Chitosan originates from the seafood processing industry and is one of the most abundant of bio-waste materials. Chitosan is a by-product of the alkaline deacetylation process of chitin. Chemically, chitosan is a polysaccharide that is soluble in acidic solution and precipitates at higher pHs.
Soon Kong Yong +9 more
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Chitosan and its derivatives for gene delivery
International Journal of Biological Macromolecules, 2011Gene delivery can particularly be used for the treatment of diseases by the insertion of genetic materials (DNA and RNA) into mammalian cells either to express new proteins or to prevent the expression of existing proteins. Chitosan, a natural polymer is nontoxic, biocompatible, and biodegradable and it is used as a support material for gene delivery ...
M. Pandima Devi +4 more
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Synthesis of cyanoethyl chitosan derivatives
Polymer Science Series A, 2006Cyanoethyl chitosan derivatives with various substitution degrees have been synthesized by the nucleophilic addition of acrylonitrile to the functional groups of chitosan. The process proceeds under homogeneous conditions without any catalyst at various pH values and reagent concentrations in the temperature range of 273–333 K.
L. A. Smirnova +6 more
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Anticancer Effects of Chitin and Chitosan Derivatives
2014Despite considerable progress in medical research, cancer is still one of the high-ranking causes of death in the world. It is the second most common cause of death due to disease after heart disease, and according to World Health Organization it will be the cause of death for more than 10 million people in 2020; therefore, one of the main research ...
Mustafa Zafer Karagozlu, Se-Kwon Kim
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Derivatives of Chitin and Chitosan
1992Compared with the extensive research that has been carried out on both the production and the properties of cellulose nitrate,1 because of its commercial importance as an explosive and as a plastic, very little research has been carried out on the nitration of chitin and chitosan.
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