摘要
以不同体积分数的乙酸溶液为分散剂,不同质量浓度的山梨醇为增塑剂,配制不同质量浓度的两种脱乙酰度壳聚糖溶液,探讨不同质量浓度基质对壳聚糖溶液pH值和电导率的影响,阐述壳聚糖溶液在成膜过程中各离子的聚合情况。对壳聚糖成膜溶液的流变学性质进行研究,并对其形成的膜进行表征,分析山梨醇对壳聚糖成膜溶液及其膜性质的影响。结果表明:壳聚糖成膜溶液体系中,主要是山梨醇、乙酸与壳聚糖中的各种离子结合形成黏稠的溶液。含与不含山梨醇作为增塑剂的壳聚糖成膜溶液均表现出假塑性流体,山梨醇与两种脱乙酰度的壳聚糖均有很好的相容性,能够形成均匀、连续的膜,使壳聚糖膜的吸热峰和放热峰发生一定的迁移,对其热稳定性有一定的影响。
Chitosans with two different degrees of deacetylation （DD） were used separately prepare different concentrations of chitosan solutions by using different concentrations （V/V） of acetic acid solutions as dispersing agent and different concentrations （m/V） of sorbitol as plasticizer. We examined the effect of acetic acid, sorbitol and chitosan concentration on the pH and conductivity of chitosan solutions, and illustrated the roles of ionic polymerizations in chitosan film formation. The rheological properties of chitosan film-forming solutions were studied and the effect of sorbitol on the properties of chitosan film-forming solutions and the formed films was analyzed. Results showed that sticky solution was formed by combination of ions from sorbitol, acetic acid and chitosan. Chitosan film-forming solutions with and without sorbitol as plasticizer were both pseudoplastic fluid, and sorbitol presented a good compatibility with the two kinds of deacetylated chitosan that could form uniform and continuous films, resulting in a shift in the endothermic and exothermic peak temperatures of chitosan films and presenting certain influence on their thermal stability.
出处
《食品科学》
EI
CAS
CSCD
北大核心
2014年第9期11-15,共5页
Food Science
基金
国家自然科学基金面上项目(31271960)
关键词
壳聚糖
溶液性质
壳聚糖膜
热稳定性
chitosan
solution properties
chitosan film
thermal stability
