低分子质量壳聚糖的制备及质量控制

Preparation and quality control of low molecular weight chitosan

目的:制备低分子质量的壳聚糖并建立相应的质量控制手段。方法:采用纤维素酶水解技术,以脱乙酰甲壳素为原料制备低分子质量壳聚糖,利用超滤技术分离不同分子质量壳聚糖;以凝胶渗透色谱法测定壳聚糖分子质量,由水解比色测定法测定壳聚糖的纯度与含量。结果:通过控制酶水解的时间,并采用截留分子质量分别为50 kD和10 kD的中空纤维素膜进行截流与浓缩,得到低分子质量壳聚糖;经凝胶渗透色谱法测定,其平均分子质量为20 kD,纯度(96.60±1.56)%。结论:采用酶解法制备低分子质量壳聚糖反应条件温和、过程容易控制,用超滤方法可实现不同分子质量水解产物的有效分离;采用凝胶渗透色谱法和水解比色法测定,可进行水解壳聚糖质量的有效控制。

Objective: To prepare the low molecular weight chitosan (LMWC) and establish the method for quality control. Method: Use enzymatic degradation to prepare LMWC with chitosan, and separate by ultrafiltration; the molecular weight and purity were determined by gel permeation chromatography (GPC) and colorimetry respectively. Result: LMWC was prepared by control the hours of enzymatic degradation and ultrafiltered through filter with cutoff molecular of 10K Dalton and 50 K dalton; the average molecular weight was 20 K dalton and the purity was (96.60 ± 1.56)% . Conclusion: The condition of enzymatic degradation is geniality and easy to control, LMWCs with different molecular weight can separate by ultrafiltration efficiently; the quality of LMWC can control with gel permeation chromatography (GPC) and colorimetry.