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羧甲基壳聚糖的降解及其抗氧化性能的研究
引用本文:孙涛,周冬香,朱颖娜,毛芳.羧甲基壳聚糖的降解及其抗氧化性能的研究[J].食品科学,2007,28(1):54-57.
作者姓名:孙涛  周冬香  朱颖娜  毛芳
作者单位:上海水产大学食品学院,上海,200090
基金项目:上海水产大学校科研和教改项目;上海市重点学科建设基金;上海市教委资助项目
摘    要:羧甲基壳聚糖是壳聚糖的一种重要衍生物。本研究采用过氧化氢氧化法对羧甲基壳聚糖进行降解,并考察了降解时间及过氧化氢用量对降解的影响。用粘度法和改进的Schales’方法测定了降解产物的分子量。并用流动注射化学发光分析法检测了降解产物的抗氧化能力——对羟基自由基的清除活性。结果表明:随着过氧化氢在降解体系中的浓度的增大,降解产物的分子量将趋于一固定值;当H2O2在总反应体系中浓度大于1.3mol/L,降解时间大于16h,将得到分子量低至1100左右的羧甲基壳聚糖;经降解得到的羧甲基壳聚糖均具有一定的羟基自由基清除活性,且分子量越小,其抗氧化性能越强。

关 键 词:羧甲基壳聚糖  过氧化氢氧化法降解  羟基自由基  抗氧化活性
文章编号:1002-6630(2007)01-0054-04
修稿时间:2005-11-20

Study on Degradation of Carboxymethy Chitosan and Their Antioxidant Activity
SUN Tao,ZHOU Dong-xiang,ZHU Ying-na,MAO Fang.Study on Degradation of Carboxymethy Chitosan and Their Antioxidant Activity[J].Food Science,2007,28(1):54-57.
Authors:SUN Tao  ZHOU Dong-xiang  ZHU Ying-na  MAO Fang
Affiliation:College of Food Science, Shanghai Fisheries University, Shanghai 200090, China
Abstract:Carboxymethy chitosan was oxidatively degraded with H2O2. The effects of reaction time and concentration of H2O2 on the degradation were studied. Viscosity determination and modified Schales' procedure were applied to assay the molecular weights of degraded carboxymethyl chitosan. Antioxidant activity of degraded carboxymethy chitosan was evaluated as hy- droxyl radical scavenger by flow injection chemoluminescence technology. The results showed that the molecular weights of degraded products would be a relative constant value with the increase of H2O2 concentration. Carboxymethyl chitosan with molecular weight of about 1100 would be obtained when the H2O2 concentration is higher than 1.3mol/L and reaction time is longer than 16h. All degraded carboxymethyl chitosans show certain hydroxyl radical scavenging activity, but the antioxidant activity is stronger at lower molecular weight.
Keywords:carboxymethy chitosan  H2O2 oxidative degradation  hydroxide radical  antioxidant activity
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