柠檬酸化壳聚糖的合成及其水溶性研究

Investigation on synthesis of citric-chitosan and its solubility in water

摘要:

为改变壳聚糖水溶性,以壳聚糖和柠檬酸为原料,乙醇为反应介质,首次在温和的条件下成功合成檬酸化壳聚糖,并优化反应的最佳工艺条件.由实验确定的最佳工艺参数为:柠檬酸/壳聚糖摩尔比为2∶1,反应温度为20℃,反应时间为0.5 h.红外光谱分析显示柠檬酸与壳聚糖发生了羧基化反应,柠檬酸被成功地接枝到壳聚糖上.所得产物水溶性实验结果表明,柠檬酸改性后的壳聚糖水溶性较单纯壳聚糖水溶性有很大程度提高.

Abstract:

To improve chitosan’s solubility in water,citric-chitosan was successfully synthesized for the first time in the mild condition with chitosan and citric acid as raw material and ethanol as reaction medium,and the process parameters were optimized: the molar ratio of citric acid to chitosan is 2∶1,the reaction temperature is 20 ℃ and the reaction time is 0.5 h.IR analysis result shows that the carboxylation reaction has occurred between citric acid and chitosan and citric acid has been successfully grafted on chitosan.In addition,the result of solubility in water shows that the citric chitosan’s solubility in water has increased a lot compared with that of the former chitosan.