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• 作者：Maolin Zhai ; Hisaaki Kudoh ; Radoslaw A Wach ; Guozhong Wu ; Mingzhang Lin ; Yusa Muroya ; Yosuke Katsumura ; Long Zhao ; Naotsugu Nagasawa ; and Fumio Yoshii
• 刊名：Biomacromolecules
• 出版年：2004
• 出版时间：March 2004
• 年：2004
• 卷：5
• 期：2
• 页码：458 - 462
• 全文大小：85K
• 年卷期：v.5,no.2(March 2004)
• ISSN：1526-4602

文摘

The reactions of OH or SO₄^- radicals with carboxymethyl chitin (CM-chitin) and its deacetylated product,carboxymethyl chitosan (CM-chitosan), were investigated in aqueous solutions using a laser photolysistechnique. The rate constants of the reactions of OH and SO₄^- radicals with CM-chitosan are alwayshigher than those for CM-chitin, indicating that the amino-group could increase the reactivity ofcarboxymethylated chitin derivatives. The rate of the reactions of CM-chitin and CM-chitosan with OHradical was found to decrease at lower pH when polymers chains tend to the coiled conformation. Incomparison, the rate constant of the reaction of SO₄^- radicals with CM-chitin or CM-chitosan decreasedwith pH, indicating that CM-chitin or CM-chitosan has a higher reactivity with the SO₄^- radical at low pHdue to the protonation of the amino group.