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Measurement of thermodynamic quantities of micellar solubilization by micellar electrokinetic chromatography with sodium dodecyl sulfate

โœ Scribed by Shigeru Terabe; Takehisa Katsura; Yukihirao Okada; Yasushi Ishihama; Koji Otsuka

Publisher
John Wiley and Sons
Year
1993
Tongue
English
Weight
715 KB
Volume
5
Category
Article
ISSN
1040-7685

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โœฆ Synopsis

Abstract

Micellar electrokinetic chromatography (MEKC) allows the calculation of distribution coefficients between a micelle and the surrounding aqueous phase from the measurement of the migration time, provided the critical micelle concentration (CMC) and the phase ratio are known. Thermodynamic quantities such as enthalpy and entropy changes of micellar solubilization were calculated from the temperature dependence of the distribution coefficients. Sodium dodecyl sulfate (SDS) was employed to prepare a micellar solution and its CMCs and partial specific volumes at different temperatures were measured. The relationship between the molecular structures of solutaes and the resulting thermodynamic quantities was investigated. The temperature inside the capillary was calculated from the temperature dependence of the distribution coefficient.

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