氨基酸离子液体对壳聚糖溶解性能的影响

Dissolution Performance of Amino Acid Ionic Liquid for Chitosan

合成了一系列氨基酸类离子液体,从中筛选出对溶解壳聚糖具有良好性能的离子液体——甘氨酸盐酸盐离子液体。在常温常压下考察了该离子液体1%～10%水溶液对壳聚糖的溶解能力,溶解壳聚糖能力最大能达到6.32%(质量分数,下同)。对离子液体重复使用5次后,溶解能力没有明显下降。采用X射线衍射(XRD)和红外光谱(FT-IR)对再生的壳聚糖进行表征,结果表明,壳聚糖在溶解过程中没有发生衍生化。甘氨酸盐酸盐离子液体水溶液是壳聚糖的良溶剂。

A series of amino acid ionic liquids were synthesized and an ionic liquid [GIy]Cl with better dissolution performance was selected. The concentration of ionic liquid aqueous solution was investigated from 1% to 10 % at normal conditions. The largest dissohulity could reach to 6.32 %. The ionic liquid could be reused for 5 times without any decrease in the dissolubility. The structures of recycled chitosan were characterized by X-ray diffraction （XRD） and Fourier transform infrared spectroscopic（FT-IR）. The results indicate that chitosan in the dismlution process doesn＇t react. [GIy]Claqueous solution is the excellent solvent for chitosan.