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Micellar electrophoresis using ionic liquids.

Maria Borissova1, Klairy Palk, Mihkel Koel

  • 1Institute of Chemistry, Faculty of Science, Tallinn University of Technology, Akadeemia tee 15, Tallinn, Estonia. mariab@chemnet.ee

Journal of Chromatography. A
|February 5, 2008
PubMed
Summary
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Ionic liquids function as effective pseudo-stationary phases in micellar electrokinetic chromatography (MEKC). These novel cationic surfactants offer a promising alternative for separating neutral compounds in capillary electrophoresis applications.

Area of Science:

  • Analytical Chemistry
  • Separation Science
  • Physical Chemistry

Background:

  • Micellar electrokinetic chromatography (MEKC) commonly employs traditional cationic surfactants.
  • Ionic liquids (ILs) present unique properties as potential alternatives for pseudo-stationary phases.
  • Understanding the aggregation behavior of ILs is crucial for their application in separation techniques.

Purpose of the Study:

  • To evaluate ionic liquid-based cationic surfactants as pseudo-stationary phases in MEKC.
  • To investigate the aggregation behavior and determine the critical micelle concentrations (CMCs) of specific alkylimidazolium ionic liquids.
  • To assess the practical utility of these ionic liquids for separating neutral analytes.

Main Methods:

  • Spectrophotometry was used to study the aggregation behavior of C12 and C14 alkylimidazolium ionic liquids in aqueous solutions.

Related Experiment Videos

  • Critical micelle concentrations (CMCs) were determined for the ionic liquids.
  • The separation of neutral analytes (methylresorcinol isomers and benzene derivatives) was performed using MEKC with ionic liquids in the running buffer.

    • Main Results:

    • The aggregation behavior of alkylimidazolium ionic liquids in aqueous media was characterized.
    • Critical micelle concentrations (CMCs) of the ionic liquids were determined and compared to conventional surfactants.
    • Successful separation of neutral analytes was achieved by incorporating ionic liquids into the MEKC system.

    Conclusions:

    • Ionic liquid-based cationic surfactants are viable pseudo-stationary phases for MEKC.
    • These novel surfactants demonstrate comparable or improved performance to traditional surfactants in specific separation tasks.
    • Ionic liquids offer a new avenue for developing advanced separation media in capillary electrophoresis.