title: Utilisation of crown ethers in microemulsion electrokinetic chromatography for the separation of inorganic cations.
abstract: A new method to influence the separation selectivity of inorganic cations in capillary electrophoresis is presented. This method combines the use of certain crown ethers to form complexes with a specific cation (changing its ionic radius/charge ratio and thereby its electrophoretic mobility) with partitioning of the crown ether/analyte complex between an aqueous phase and a pseudo-stationary phase, such as the oil droplet of a microemulsion. Several microemulsions, including uncharged oil droplets and oil droplets with different degrees of surface charge were tested to evaluate their ability to improve the separation of the selected analytes.
authors.affiliation: Institute of Analytical Chemistry, Johannes Kepler University Linz, Altenbergerstr. 69, A-4040 Linz, Austria.
authors.forename: Helmy A
authors.initials: HA
authors.lastname: Cook
authors.forename: Christian W
authors.initials: CW
authors.lastname: Klampfl
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Buchberger
mesh_terms: D002412:Cations / Q000032:analysis*; D020374:Chromatography, Micellar Electrokinetic Capillary / Q000295:instrumentation / Q000379:methods*; D043844:Crown Ethers / Q000737:chemistry*; D019075:Electrophoresis, Capillary / Q000379:methods; D004655:Emulsions / Q000737:chemistry; D015203:Reproducibility of Results
chemical_list: D002412:Cations; D043844:Crown Ethers; D004655:Emulsions