title: Comparison of microemulsion electrokinetic chromatography and micellar electrokinetic chromatography as methods for the analysis of ten benzophenones.
abstract: Microemulsion electrokinetic chromatography (MEEKC) and micellar electrokinetic chromatograpy (MEKC) were compared for their abilities to separate and detect ten similar benzophenones, which are commonly used as UV filters in various plastic and cosmetic products. Sodium dodecyl sulfate (SDS) concentration and column temperature rarely affected separation resolution for MEEKC, but separation of benzophenones could be improved by changing the SDS concentration and column temperature for MEKC. Buffer pH and ethanol (organic modifier) were found to markedly influence the separation selectivity for both MEEKC and MEKC systems. In addition, a higher electric voltage improved the separation efficiency without a noticeable reduction in separation resolution for MEEKC, whereas it caused a poor separation resolution for the MEKC system.
authors.affiliation: Department of Chemistry and Center for Nanotechnology at CYCU, Chung Yuan Christian University, Chung-Li, Taiwan, R.O.C.
authors.forename: Hsi-Ya
authors.initials: HY
authors.lastname: Huang
authors.affiliation: Department of Chemistry and Center for Nanotechnology at CYCU, Chung Yuan Christian University, Chung-Li, Taiwan, R.O.C.
authors.forename: Chen-Wen
authors.initials: CW
authors.lastname: Chiu
authors.affiliation: Department of Chemistry and Center for Nanotechnology at CYCU, Chung Yuan Christian University, Chung-Li, Taiwan, R.O.C.
authors.forename: Yen-Chen
authors.initials: YC
authors.lastname: Chen
authors.affiliation: Department of Chemistry and Center for Nanotechnology at CYCU, Chung Yuan Christian University, Chung-Li, Taiwan, R.O.C.
authors.forename: Jui-Ming
authors.initials: JM
authors.lastname: Yeh
mesh_terms: D001577:Benzophenones / Q000032:analysis* / Q000302:isolation & purification*; D002021:Buffers; D020374:Chromatography, Micellar Electrokinetic Capillary / Q000379:methods*; D003358:Cosmetics / Q000737:chemistry; D004563:Electrochemistry; D004655:Emulsions; D006863:Hydrogen-Ion Concentration; D012967:Sodium Dodecyl Sulfate; D013473:Sunscreening Agents / Q000032:analysis* / Q000302:isolation & purification*; D013696:Temperature
chemical_list: D001577:Benzophenones; D002021:Buffers; D003358:Cosmetics; D004655:Emulsions; D013473:Sunscreening Agents; D012967:Sodium Dodecyl Sulfate
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