LOW MOLECULAR WEIGHT O-CARBOXYMETHYLATED CHITOSANS DERIVED FROM IRRADIATED CHITOSAN AND THEIR ANTIBACTERIAL ACTIVITY* |
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Authors: | Xu-pin Zhuang Xiao-fei Liu Zhi Li Yun-lin Guan Kang-de Yao |
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Affiliation: | a.School of Materials Science and Engineering; Tianjin University; Tianjin 300072; China b.School of Economics; Nankai University; Tianjin 300071; China |
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Abstract: | Original chitosan with Mv of 2.7 × 105 was degraded by irradiation with γ-rays and a series of low molecular weight O-carboxymethylated chitosans (O-CMCh) were prepared based on the irradiated chitosan. A kinetic model of the irradiation of chitosan was put forward. Results show that the irradiation degradation of chitosan obeys the rule of randomdegradation and the degree of deacetylation of irradiated chitosan is slightly raised. The antibacterial activity of O-CMCh is significantly influenced by its MW, and a suppositional antibacterial peak appears when Mv is equal to 2 × 105. |
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Keywords: | Chitosan O-Carboxymethylated chitosan Irradiation degradation Antibacterial activity Molecular weight |
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