壳聚糖与阿拉伯胶静电复合作用研究及显微观察c  

Study and microscopic observation on polyelectrolyte complexation of chitosan and gum arabic

作　　者：张立彦[1] 刘小芳[1] 

机构地区：[1]华南理工大学轻工与食品学院,广州510640

出　　处：《食品科技》2016年第4期238-242,248,共6页Food Science and Technology

基　　金：华南理工大学中央高校基本科研业务费项目(2014ZM0070)

摘　　要：探讨了壳聚糖分子量、脱乙酰度及壳聚糖与阿拉伯胶配比、溶液pH及浓度对溶液浊度、复合物ζ-电位及显微结构的影响,研究了壳聚糖与阿拉伯胶静电复合过程中各条件的作用机制。结果表明：壳聚糖分子量为15 W时更易与阿拉伯胶复合,而壳聚糖脱乙酰度在阿拉伯胶远远过量时才对复合产生显著影响,且脱乙酰度较低更利于形成大的复合物颗粒;阿拉伯胶的加量显著影响PEC的显微结构,溶液的浊度也随之发生四阶段变化;pH介于3.0~4.0之间时溶液浊度高,PEC结构因pH改变而不同;复合物的结构及溶液浊度会随聚合物浓度发生改变。上述条件影响到壳聚糖与阿拉伯胶分子的电荷密度、分子链伸展程度及柔韧性,改变PEC的显微结构,进而使溶液浊度发生改变。Effects of molecular weight,degree of chitosan deacetylation,ratio of chitosan and gum arabic,pH and concentration of solution on microstructure of polyelectrolyte complexes（PEC）,turbidity and ζ-potential of solution were investigated.And the mechanisms of aforementioned conditions were researched.The results showed that： chitosan with molecular weight of 15 W reacted more easily with gum arabic.The degree of chitosan deacetylation exhibited significant effect on complexation when there was excess gum Arabic in solution,and chitosan with lower degree of deacetylation could form larger PEC.Addition of gum arabic affected the microstructure of PEC significantly and the turbidity of solution showed 4 phases with addition level of gum arabic.When pH was between 3.0 and 4.0,solution showed highest turbidity and the microstructure of PEC changed with pH changing.Microstructure of PEC and turbidity of solution changed with the concentration of polymers changing.The aforementioned conditions affected density of charge,extensibility and flexibility of molecular chains,so microstructure of PEC and turbidity of solution changed as a result.

关 键 词：壳聚糖 阿拉伯胶 静电复合 显微结构 浊度 

分 类 号：TS241[轻工技术与工程—制糖工程]