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The effects of a mixture of charged and neutral additives on analyte migration behavior in capillary electrophoresis

TitleThe effects of a mixture of charged and neutral additives on analyte migration behavior in capillary electrophoresis
Publication TypeJournal Article
Year of Publication1998
AuthorsKranack, AR, Bowser, MT, Britz-McKibbin, P, Chen, DDY
JournalElectrophoresis
Volume19
Pagination388-396
Date PublishedMar
Type of ArticleArticle
ISBN Number0173-0835
KeywordsANALYTE, ASPECTS, BETA-CYCLODEXTRIN, CHIRAL, ELECTROPHORESIS, MICELLAR ELECTROKINETIC CHROMATOGRAPHY, MIGRATION BEHAVIOR, MOBILE PHASES, multicomponent additives, RESOLUTION, SELECTIVITY, SEPARATION, separation theory, STATIONARY PHASE, THEORETICAL, TIOCONAZOLE ENANTIOMERS, two-additive capillary, ZONE ELECTROPHORESIS
Abstract

Multicomponent additives, such as derivatized cyclodextrins with various degrees of substitution, can be considered single-component additives as long as the fraction of each component remains constant. In this paper, equations are derived describing the effect of such additives on the migration behavior of analytes. These equations are used in the study of capillary electrophoresis (CE) systems with differentially charged cyclodextrins as additives. For weakly acidic analytes, the binding with highly negatively charged sulfobutyl ether beta-cyclodextrin (SBE-beta-CD) increases their negative electrophoretic mobility, while the binding with neutral hydroxypropyl-beta-cyclodextrin (HP-beta-CD) decreases their negative mobility. By obtaining the equilibrium constants and mobilities for each additive with each analyte (in this case, phenol, 2-naphthol and 1-naphthol), the migration behavior of these analytes in CE systems is quantitatively predicted at various concentrations of mixtures of the two additives. The properties of the contour lines in the binding isotherm surfaces of such CE systems are discussed.

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