壳聚糖理化性能：粘均分子量、脱乙酰度及结晶性能测定  

Physicochemical Properties of Chitosan: Determination of Viscosity Average Molecular Weight, Degree of Deacetylation and Crystallinity

作　　者：胡秀林 张海连[1] Hu Xiulin;Zhang Hailian(Leshan Normal University,School of Chemistry,Leshan 614000,China)

机构地区：[1]乐山师范学院化学学院

出　　处：《广东化工》2019年第22期22-23,25,共3页Guangdong Chemical Industry

基　　金：2016年国家级大学生创新创业训练计划项目(项目编号201610649035)

摘　　要：使用粘度法测定了阿拉丁牌低粘、中粘、高粘和沪试牌四种壳聚糖的分子量,分别约为126万,115万,69万和56万。分别使用酸碱滴定法和双突跃电位滴定法测定了脱乙酰度,结果表明后者更精密,四类壳聚糖的脱乙酰度值均在78%~86%之间。X射线衍射测得阿拉丁牌壳聚糖具有相对较低的结晶度,脱乙酰度降低导致结晶度下降。The molecular weights of four kinds of chitosan,Aladdin low,medium,high viscosity and Hushi brand,were determined by viscometric method,which were about 1.26,1.15,6.9 and 5.6×10^6 respectively.The degree of deacetylation was determined by acid-base titration and potentiometric titration respectively.The results showed that the latter was more precise.The degree of deacetylation of four kinds of chitosan ranged from 78 to 86%.The crystallinity of Aladdin chitosan was lower than Hushi brand by X-ray diffraction.The decrease of deacetylation degree resulted in the decrease of crystallinity.

关 键 词：壳聚糖 结晶度 脱乙酰度 分子量 

分 类 号：O636.1[理学—高分子化学]