Determination of critical micelle concentration values using capillary electrophoresis instrumentation
Determination of critical micelle concentration values using capillary electrophoresis instrumentation
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DOI：
10.1021/ac970696n
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发表时间：
1997-10-15
影响因子：
7.4
通讯作者：
DiezMasa, JC
中科院分区：
文献类型：
--
作者：
Cifuentes, A;Bernal, JL;DiezMasa, JC
这项工作的目的是证明毛细管电泳仪(CE)在测定表面活性剂临界胶束浓度(CMC)值方面的有效性，该方法基本上包括传统的电导法测定临界胶束浓度(CMC)的CE版本。也就是说，离子表面活性剂在溶液中的不同电导率取决于它们的聚集状态，即作为单体或胶束，以及在毛细管电泳仪中通常测量的对电流的影响来确定CME值。十二烷基硫酸钠(十二烷基硫酸钠)和十六烷基三甲基溴化铵(CTAB)在水、含盐水溶液、有机盐溶液和含β-环糊精水溶液中的临界胶束浓度(CMC)是在几种介质中得到的。在此条件下测定的十二烷基硫酸钠和十六烷基三甲基溴化铵的临界胶束浓度与文献报道的结果吻合较好。讨论了该方法的优缺点及其在胶束电动色谱中的应用。结果表明，该方法具有较高的可信度，可以快速简便地确定CMC。
The purpose of this work is to demonstrate the usefulness of capillary electrophoresis (CE) instrumentation for determining values of critical micelle concentration (cmc) of surfactants, The approach essentially consists of a CE version of the traditional method of measuring values of cmc by conductivity. Namely, the different conductivities of ionic surfactants in solution depending on their aggregation state, i.e., as monomers or micelles, and the effect on the electrical current as usually measured in a CE apparatus are employed to determine the cme values. The cmc of sodium dodecyl sulfate (SDS) and cetyltrimethylammonium bromide (CTAB) is obtained in several media such as water, aqueous solutions containing salts, organosaline solutions, and aqueous Solutions containing beta-cyclodextrin. The cmc values for SDS and CTAB under these conditions are in good agreement with those reported in the literature. Advantages and drawbacks of this procedure as well as its implications in micellar electrokinetic chromatography are discussed. From our results, it is deduced that the present method can be used with high confidence to determine values of cmc in a fast and easy way.