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  • Title: Polarographic determination of sunscreen agents in cosmetic products in micellar media.
    Author: da Silva AP, Trindade MA, Ferreira VS.
    Journal: Talanta; 2006 Jan 15; 68(3):679-85. PubMed ID: 18970375.
    Abstract:
    This paper introduces a simple, fast and reliable electroanalytical method for differential-pulse polarography based on electrochemical reduction at a dropping mercury electrode. The method was validated for the determination of 2-ethylhexyl-4-methoxycinnamate (EHMC) alone and in association with 4-methylbenzylidene camphor (MBC) or 2-hydroxy-4-methoxybenzophenone (BENZ-3) in samples of commercial cosmetic preparations. The supporting electrolyte that provided the best-defined and most intense peak current for EHMC determination was Britton-Robinson buffer (pH 4.0) in the presence of a cationic surfactant. Under optimized conditions, EHMC exhibited one single peak of reduction at -1.49 V versus Ag/AgCl. A limit of detection of 3.76 x 10(-8)mol L(-1) and a limit of quantitation of 1.25 x 10(-7) mol L(-1) were found for the pure EHMC standard. A good average recovery rate was reached for all the samples analyzed.
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