title: Rapid determination of the critical micelle concentration by Taylor dispersion analysis in capillaries using both direct and indirect detection.
abstract: The critical micelle concentration is a basic characteristic of surfactants. In this article, the process of formation of micelles is studied by Taylor dispersion analysis using capillary electrophoresis instrumentation as a substituent of capillary liquid chromatography. New methods for determination of critical micelle concentration are presented. Sodium octylbenzene sulfonate and sodium dodecylsulfate are used as model compounds with and without chromophore. Two novel approaches based on indirect ultraviolet detection and indirect Taylor dispersion analysis with direct ultraviolet detection are introduced for the determination of critical micelle concentration value of surfactant without any chromophore. The determined critical micelle concentration values are in correspondence with the tabulated values at 95% confidence level.
authors.affiliation: Department of Analytical Chemistry, Faculty of Science, Regional Centre of Advanced Technologies and Materials, Palacký University in Olomouc, Olomouc, Czech Republic.
authors.forename: Jan
authors.initials: J
authors.lastname: Petr
keywords: Taylor dispersion analysis; capillary electrophoresis; critical micelle concentration; indirect detection