title: Surfactant-coated single-walled carbon nanotubes as a novel pseudostationary phase in capillary EKC.
abstract: The analytical potential of the use of surfactant-coated single-walled carbon nanotubes (SC-SWNTs) as pseudostationary phase in CE is described. The pseudostationary phase shows an efficient alternative in enhancing electrochromatographic resolution of compounds which are capable of interacting with a nanotube surface, such as aromatic compounds. In general, the resolution is enhanced by increasing nanotube concentration in the buffer but the maximum amount of SWNTs that can be added to background electrolyte was found limited by compatibility with the UV/visible detection. As an alternative, a low-extension partial filling was used, consisting of the introduction into the capillary of concentrated SC-SWNT, just before the sample, with a plug length similar to the sample one. This has been showed as a reliable procedure in increasing resolution and sensitivity by sweeping phenomena. Finally, the potential of SC-SWNTs to perform chiral separations is discussed.
authors.affiliation: Department of Analytical Chemistry, Marie Curie Building (Annex), Campus de Rabanales, University of Córdoba, Córdoba, Spain.
authors.forename: Beatriz
authors.initials: B
authors.lastname: Suárez
authors.forename: Bartolomé M
authors.initials: BM
authors.lastname: Simonet
authors.forename: Soledad
authors.initials: S
authors.lastname: Cárdenas
authors.forename: Miguel
authors.initials: M
authors.lastname: Valcárcel
mesh_terms: D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000302:isolation & purification; D002733:Chlorophenols / Q000302:isolation & purification; D020374:Chromatography, Micellar Electrokinetic Capillary / Q000295:instrumentation* / Q000379:methods; D007536:Isomerism; D037742:Nanotubes, Carbon / Q000737:chemistry*; D012680:Sensitivity and Specificity; D013501:Surface-Active Agents / Q000737:chemistry
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D002733:Chlorophenols; D037742:Nanotubes, Carbon; D013501:Surface-Active Agents