TITLE:
Analytical Determination of Benzophenone-3 in Sunscreen Preparations Using Boron-Doped Diamond Electrodes
AUTHORS:
Michelli Thomaz Laranjeira, Fabio de Lima, Silvio Cesar de Oliveira, Valdir Souza Ferreira, Robson Tadeu Soares de Oliveira
KEYWORDS:
Boron-Doped Diamond, Benzophenone-3 BENZO and Square-Wave Voltammetry
JOURNAL NAME:
American Journal of Analytical Chemistry,
Vol.2 No.3,
July
26,
2011
ABSTRACT: A new electroanalytical procedure was developed for the determination of Benzophenone-3 (BENZO) in commercial sunscreen as the active ingredient. The procedure is based on the use of electrochemical methods as cyclic and square-wave voltammetry, with boron-doped diamond (BDD) electrodes. The reduction of BENZO in Britton-Robinson buffer (0.1 mol●L–1) using this type of electrode gives rise to one irreversible peak in –1.30 V (versus Ag/AgCl) in presence of cationic surfactant cetyltrimethylammonium bromide (CTABr). The proposed electrochemical method was successfully applied to the analysis of commercially available pharmaceutical preparations.