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

Andrea R. Kranack, Michael T. Bowser, Philip Britz-McKibbin, David D Y Chen

Research output: Contribution to journalShort surveypeer-review

20 Scopus citations

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 β-cyclodextrin (SBE-β-CD) increases their negative electrophoretic mobility, while the binding with neutral hydroxypropyl-β-cyclodextrin (HP-β-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.

Original languageEnglish (US)
Pages (from-to)388-396
Number of pages9
JournalELECTROPHORESIS
Volume19
Issue number3
DOIs
StatePublished - Mar 1 1998

Keywords

  • Analyte
  • Migration behavior
  • Multicomponent additives
  • Separation theory
  • Two-additive capillary electrophoresis

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