文献类型：期刊文献

中文题名：十二烷基磺酸钠对κ-卡拉胶溶胶-凝胶转变的影响

英文题名：Effects of Sodium Dodecyl Sulfonate on the Sol-gel Transition of κ-Carrageenan

作者：李想[1];陈志云[2];尹屹梅[1];张洪斌[1]

机构：[1]上海交通大学化学化工学院高分子科学与工程系,上海200240;[2]华东理工大学化学与分子工程学院,上海200237

年份：2008

卷号：66

期号：24

起止页码：2735

中文期刊名：化学学报

外文期刊名：Acta Chimica Sinica

收录：CSTPCD;;Scopus;WOS:【SCI-EXPANDED(收录号:WOS:000262389100013)】；北大核心:【北大核心2004】；CSCD:【CSCD2011_2012】；

语种：中文

中文关键词：κ-卡拉胶;表面活性剂;溶胶-凝胶转变;多糖;十二烷基磺酸钠

外文关键词：κ-carrageenan; surfactant; sol-gel transition; polysaccharide; sodium dodecyl sulfonate （SDSN）;

摘要：研究了阴离子表面活性剂十二烷基磺酸钠(sodium dodecyl sulfonate,SDSN)对同荷聚阴离子多糖κ-卡拉胶(κ-CAR)溶胶-凝胶转变的影响.通过不同浓度的SDSN加入前后对κ-CAR溶液的流变行为和热行为的比较发现,SDSN随浓度不同基本以两种方式影响κ-CAR的溶胶-凝胶转变,低浓度时(c<5mmol·L-1)SDSN对κ-CAR的溶胶-凝胶转变影响很小,仅有轻微的促进作用,使凝胶的起始温度和转变温度略向高温方向移动;而当c>5mmol·L-1时,SDSN显著影响κ-CAR的溶胶-凝胶转变,使转变温度向低温方向移动,凝胶形成变得困难.同时发现,SDSN的浓度大于其临界胶束浓度(CMC)时,伴随κ-CAR的凝胶过程形成类似SDSN低温结晶的有序结构.进一步利用生物染料亚甲基兰(MB)为探针,通过测定κ-CAR-MB体系的UV-Vis光谱,探讨了阴离子表面活性剂SDSN与聚阴离子κ-CAR相互作用的机理可能为同种电荷之间的静电排斥作用、对K+的竞争以及疏水作用.
The effects of anionic surfactant sodium dodecyl sulfonate （SDSN） on the sol-gel transition of κ-carrageenan （κ-CAR）, an anionic polysaccharide, have been investigated by different techniques including rheology, differential scanning calorimetry （DSC） and UV-Vis spectrometry. It has been found that, SDSN, at low concentrations （cSDSN〈5 mmol·L-1）, slightly promoted the gelation of κ-CAR due to a weak salt-out effect, whereas at higher concentrations （c〉5 mmol·L-1）, SDSN not only obviously decreased the sol-gel transition temperature of κ-CAR, but also formed a new ordered structure in the gel matrix of κ-CAR.The patterns of interactions between K-CAR and SDSN were discussed. And a mechanism of cooperative interactions of electrostatic repulsion, competition for K^＋and hydrophobic interaction has been proposed to in-terpret the experimental results.