title: Selectivity of single, mixed, and modified pseudostationary phases in electrokinetic chromatography.
abstract: The selectivity of a compilation of single, mixed, and modified EKC pseudostationary phases, described in the literature and characterized through the solvation parameter model, is analyzed. Not only have micellar systems of different nature been included but also microemulsions, polymeric, and liposomial phases. In order to compare the systems, a principal component analysis of the coefficients of the solvation equation is performed. From this analysis, direct information of the system properties, differences in selectivity, as well as evidence of lack of accuracy in some system characterizations are obtained. These results become a very useful tool to perform separations with mixtures of surfactants, since it is possible to know which mixtures will provide a greater selectivity variation by changing only the composition of the pseudostationary phases. Furthermore, the variation of the selectivity of some mixtures, as well as the effect of the addition of organic solvents on selectivity, is also discussed.
authors.affiliation: Departament de Química Analítica, Universitat de Barcelona, Barcelona, Spain.
authors.forename: Elisabet
authors.initials: E
authors.lastname: Fuguet
authors.forename: Clara
authors.initials: C
authors.lastname: Ràfols
authors.forename: Elisabeth
authors.initials: E
authors.lastname: Bosch
authors.forename: Michael H
authors.initials: MH
authors.lastname: Abraham
authors.forename: Martí
authors.initials: M
authors.lastname: Rosés
mesh_terms: D020374:Chromatography, Micellar Electrokinetic Capillary / Q000379:methods* / Q000706:statistics & numerical data; D008081:Liposomes; D008823:Micelles; D008962:Models, Theoretical; D025341:Principal Component Analysis; D012997:Solvents; D013501:Surface-Active Agents / Q000302:isolation & purification
chemical_list: D008081:Liposomes; D008823:Micelles; D012997:Solvents; D013501:Surface-Active Agents