Application of the Retention Index Concept in Micellar Electrokinetic Capillary Chromatography

Abstract

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Retention indices in micellar electrokinetic chromatography

“…Based on the criteria for reference compounds in LC, suggested by Smith [ 18] and Pac~ikovfi and Feltl [4[, the following requirements were formulated for a homologous series to be applicable as retention index scale in MEKC [12]: 1. relationship between log k and the number of carbon atoms in the homologues must be linear; 2. lowest homologue should be reasonably polar, in order to obtain a wide scale of retention indices, covering the greater part of the elution window; 3. should contain a strong chromophore to detect them spectrophotometrically, as most CE instruments apply on-column UV detection; 4. should not possess an electrophoretic mobility,…”

“…Muijselaar et al [12] applied n-alkylbenzenes and alkylaryl ketones as retention index standards in sodium dodecyl sulphate (SDS), cetyltrimethylammonium bromide (CTAB) and dodecyltrimethylammonium bromide (DTAB) surfactant systems. In Fig.…”

“…This enables the comparison of experimental results obtained with different batches of electrolyte systems or in different laboratories. For example retention indices for phenol and nitrobenzene have been reported to be 531 and 622 [12] in an electrolyte system of 50 mM SDS, 20 mM Tris-boric acid (pH 8.5), and 534 and 626 (calculated from retention data in [19]) in an electrolyte system of 50 mM SDS, 100 mM borate-50 mM phosphate (pH 7.0), respectively.…”

Evaluation and characterization of pseudo-stationary phases in micellar electrokinetic chromatography

“…LSER studies are also based on a thermodynamic approach and provide quantitative information about different solute-micelle interaction phenomena. They can be used to elucidate which mechanisms play a dominant role in Presented at the 21 st ISC held in Stuttgart, Germany, 15th-20 th September, 1996 Previously we demonstrated that the retention index, I, is a good migration parameter to compare different surfactant systems since I is independent of the concentration, molar volume and critical micelle concentration of the applied surfactant [8]. For a given sample compound in a specific surfactant system, SF, a AIsF value can be calculated according to:…”

Linear Free Energy Relationship Correlation of the Distribution of Solutes between Water and Sodium Dodecyl Sulfate (SDS) Micelles and between Gas and SDS Micelles

“…Several research groups [7][8][9][10][11][12][13][14] 2 which tabulated the data as log P x,SDS/water values. In several recent studies researchers expressed the solute concentrations in molarity and reported either the molarity-based partition coefficient, P c,SDS/water , or a binding constant K s .…”