中文摘要：

合成氨基酸类离子液体甘氨酸氟硼酸盐-[Gly]BF4,构建该离子液体与壳聚糖的均相体系,在此体系下采用纤维素酶对壳聚糖进行降解。研究发现该离子液体在溶解壳聚糖的过程中可以有效破坏壳聚糖中氢键,并且增加纤维素酶与壳聚糖之间可及度,促进降解效果。考察不同条件对反应的影响,确定最佳条件：质量分数2%离子液体水溶液与壳聚糖组成均相体系,pH 5.0,反应时间3h,反应温度50℃,壳聚糖1.0g,酶用量0.1g,所得降解产物平均相对分子质量可达2 000左右,具有良好水溶性,较常规体系下酶解反应有很大改善。同时,离子液体具有良好重复使用性。

英文摘要：

Ionic liquid glycine tetrafluoroborate-[Gly]BF4 was synthesized and the situ enzymatic hydrolysis of chitosan was investigated by cellulase in the homogeneous sys- tem of ionic liquid and chitosan. The results showed that the [Gly]BF4 could effectively destroy the hydrogen bonds in chitosan and improve the enzymatic hydrolysis. The ob- tained optimum conditions were [Gly]BF4 concentration 2%, pHS. 0, reaction tempera- ture 50 ℃, reaction time 3 h,chitosan 1.0 g and enzyme dosage 0. 1 g. Under above conditions, the viscosity-average molecular weight of product was about 2 000. There was no obvious change in viscosity-average molecular weight of the product when the i- onic liquid was reused for 3 times.