Journal
ELECTROPHORESIS
Volume 26, Issue 4-5, Pages 895-902Publisher
WILEY
DOI: 10.1002/elps.200410117
Keywords
benzophenones; micellar electrokinetic chromatography; microemulsion electrokinetic chromatography; sunscreens; UV filters
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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 doclecyl sulfate (SDS) concentration and column temperature rarely-affected separation resolution for MEEKC, but separation of benzophenones could be improved by changing the SIDS 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.
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