SIOC English
化学学报
高级检索

化学学报 ›› 2008, Vol. 66 ›› Issue (24): 2735-2741. 上一篇    下一篇

研究论文

十二烷基磺酸钠对κ-卡拉胶溶胶-凝胶转变的影响

李 想a 陈志云b 尹屹梅*,a 张洪斌a

  

  1. (a上海交通大学化学化工学院 高分子科学与工程系 上海 200240)
    (b华东理工大学化学与分子工程学院 上海 200237)

  • 投稿日期:2008-01-29 修回日期:2008-06-12 发布日期:2008-12-28
  • 通讯作者: 尹屹梅

Effects of Sodium Dodecyl Sulfonate on the Sol-gel Transition of κ-Carrageenan

LI, Xiang a CHEN, Zhi-Yun b YIN, Yi-Mei *,a ZHANG, Hong-Bin a   

  1. (a Department of Polymer Science and Engineering, School of Chemistry and Chemical Technology,
    Shanghai Jiao Tong University, Shanghai 200240)
    (b School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237)
  • Received:2008-01-29 Revised:2008-06-12 Published:2008-12-28
  • Contact: YIN, Yi-Mei

PDF

1515

被引次数

10 | 2

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＜5 mmol•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＞5 mmol•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.

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

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 κ-CAR and SDSN were discussed. And a mechanism of cooperative interactions of electrostatic repulsion, competition for K＋and hydrophobic interaction has been proposed to interpret the experimental results.

Key words: κ-carrageenan, surfactant, sol-gel transition, polysaccharide, sodium dodecyl sulfonate (SDSN)