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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 effect of anionic surfactant sodium dodecyl sulfonate (SDSN) on the sol-gel transition of κ-carrageenan loaded with polyanionic polyanionic polysaccharide was studied. Comparison of the rheological behavior and thermal behavior of κ-CAR solution showed that SDSN affected the sol-gel transition of κ-CAR almost in two different ways with different concentrations, and at low concentrations (c <5 mmol·L-1) The sol-gel transition of κ-CAR had little effect, with only a slight promotion effect, which caused the initial temperature and transition temperature of the gel to move slightly toward the high temperature. When c> 5mmol·L-1, SDSN significantly affected κ-CAR sol-gel transition, the transition temperature to the low temperature direction, the gel formation becomes difficult.At the same time SDSS concentration is greater than its critical micelle concentration (CMC), with κ-CAR gel process The ordered structure similar to the low temperature crystallization of SDSN was formed.Using methylene blue as a probe, the UV-Vis spectra of κ-CAR-MB system were further explored to investigate the interaction between anionic surfactant SDSN and polyanionic κ The mechanism of -CAR interaction may be electrostatic repulsion between the same type of charges, competition for K + And hydrophobic interaction.