Determination of 4-methylbenzilidene camphor in sunscreen by square wave voltammetry in media of cationic surfactant |
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Authors: | Juliano Carvalho Cardoso Bruna Milca Lenzi Armondes Tatiane Alfonso de Araújo Jorge Luiz Raposo Jr Nilva R Poppi Valdir Souza Ferreira |
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Institution: | aDepartamento de Química, CCET, Universidade Federal de Mato do Grosso Sul, Av. Filinto Muller, 1555, Caixa Postal 549, Campo Grande, MS Cep 79074-460, Brazil |
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Abstract: | The voltammetric behavior of 4-methylbenzelidene camphor (MBC) was studied by square wave voltammetry (SWV) using mercury electrode. The experimental condition that provided the highest peak current with the best reduction signal definition of MBC was found in Britton-Robinson buffer and cationic surfactants, cetyltrimethylammoniun bromide (CTABr). A single peak of MBC reduction was observed at − 1.21 V versus Ag/AgCl. The developed methodology was applied for determination of MBC in commercial sunscreen SPF 15, 20 and 30 and for the simultaneous determination when other protection agents were associated, such as benzophenone-3 (BENZO) and octyl methoxycinammate (OMC). Both methodologies had shown good determination values for the analyzed samples. The calculated detection limit was 2.99 × 10− 9 mol L− 1 and the quantification limit was 9.98 × 10− 9 mol L− 1. |
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Keywords: | Cationic surfactant 4-Methylbenzelidene camphor Benzophenone-3 Octyl methoxycinammate Square wave voltammetry |
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