Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 987, Issue 1-2, Pages 269-275Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0021-9673(02)01821-6
Keywords
cosmetics; sunscreens; supercritical fluid extraction; benzophenones; Tween 20
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Benzophenones are common additives in commercial sunscreen products. These UV absorbers were extracted by supercritical fluid extraction (SFE), and then analyzed by capillary zone electrophoresis (CZE) and high-performance liquid chromatography. This study was applied to identify the contents of benzophenones in cosmetic matrix, and simultaneously, to investigate the behavior of migration in CZE. Adding non-ionic surfactant (Tween 20) to optimize the separation in the CZE operation improves resolution. In SFE, we chose carbon dioxide with 2.5% modifier of 10% aqueous phosphoric acid-MeOH (1:1) as the supercritical fluid. Real recoveries of up to 92% with relative standard deviations of less than 4.0% were achieved. These analytical techniques were also applied to assay benzophenones for ten commercial sunscreen cosmetics. We found benzophenone 3 was the most commonly used sunscreen additive in Taiwan. (C) 2002 Elsevier Science B.V. All rights reserved.
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