脱乙酰度、pH和离子强度对壳聚糖溶液流变性质的影响  

Effects of Degree of Deacetylation,pH and Ionic Strength on Rheological Properties of Chitosan Solution

作　　者：李星科[1] 纵伟[1] 章银良[1] 夏文水[2] 

机构地区：[1]郑州轻工业学院食品与生物工程学院,河南郑州450002 [2]江南大学食品学院,江苏无锡214122

出　　处：《现代食品科技》2013年第1期11-14,共4页Modern Food Science and Technology

基　　金：国家863计划项目(2007AA100401);重点实验室目标导向项目(SKLF-MB-200805);江苏省科技成果转化项目(BA2009082)

摘　　要：本文对壳聚糖稀溶液的流变学性质进行了研究,重点探讨了脱乙酰度、pH值和离子强度对壳聚糖稀溶液的流变学性质的影响。结果表明:随着脱乙酰度的增大和pH值的增大,壳聚糖溶液的黏度先减小后增大,分别在脱乙酰度70.8%和pH 4.9时黏度达到最小;离子强度的增大导致壳聚糖溶液的黏度降低。黏度的变化与壳聚糖溶液的带电情况有直接关系,随着脱乙酰度的增大,壳聚糖溶液的Zeta电位和电导率一直在增大;随着溶液pH值的升高,溶液的Zeta电位在降低;而随着溶液离子强度和pH值的增加,溶液的电导率在增加。Rheological properties of chitosan solutions, in which the effects of degree of deacetylafion, pH and ionic slrength on viscosities of chitosan solution were studied in this paper. Resutts showed that viscosity initially decreased and then increased with the increase of degree of deacetylation and pH, reaching the minimum at 70.8% of DD and at pH 4.9. Viscosity decreased with the increase of ionic strength. These results were related with the charged chitosan molecules and solution. With the increase of degree of deacetylation, Zeta potential and conductivity of solution increased and Zeta potential decreased with the increase of pH while conductivity increased with the increase of pH and ionic strength.

关 键 词：壳聚糖溶液 流变学性质 ZETA电位 电导率 

分 类 号：TS201.2[轻工技术与工程—食品科学]