title: Simultaneous electrochemical determination of three sunscreens using cetyltrimethylammonium bromide.
abstract: This paper proposes a methodology based on electrochemical reduction for the simultaneous determination of three sunscreen agents, namely 4-methylbenzylidene camphor (MBC), benzophenone-3 (BENZO) and 2-ethylhexyl-4-methoxycinnamate (EHMC) by differential-pulse polarography (DPP). The highest peak currents and optimal separation of reduction peaks were obtained by using a supporting electrolyte consisted of Britton-Robinson buffer-methanol (8:2) solution at pH 4.0 and cationic surfactant 3.0 x 10(-4)mol L(-1) cetyltrimethylammonium bromide (CTAB). The methodology was validated using four commercial sunscreen preparation as a sample and the results showed high recovery rates. The efficiency of the proposed methodology was demonstrated by comparing the results obtained by DPP with those obtained by the high-performance liquid chromatography (HPLC) method.
authors: Department of Chemistry, CCET, Universidade Federal de Mato Grosso do Sul, Av. Filinto Muller, 1555, PO Box 549, Campo Grande, MS 79074-460, Brazil.
authors: Juliano Carvalho
authors: JC
authors: Cardoso
authors: Bruna Milca Lenzi
authors: BM
authors: Armondes
authors: João Bosco Galindo Júnior e Valdir Souza
authors: JB
authors: Ferreira
mesh_terms: D001577:Benzophenones / Q000032:analysis; D002138:Calibration; D000077286:Cetrimonium; D002593:Cetrimonium Compounds / Q000032:analysis*; D002851:Chromatography, High Pressure Liquid; D002934:Cinnamates / Q000032:analysis; D004563:Electrochemistry; D004566:Electrodes; D006863:Hydrogen-Ion Concentration; D007202:Indicators and Reagents; D008628:Mercury / Q000737:chemistry; D000432:Methanol / Q000737:chemistry; D011048:Polarography; D012997:Solvents; D013056:Spectrophotometry, Ultraviolet; D013473:Sunscreening Agents / Q000032:analysis*
chemical_list: D001577:Benzophenones; D002593:Cetrimonium Compounds; D002934:Cinnamates; D007202:Indicators and Reagents; D012997:Solvents; D013473:Sunscreening Agents; C118580:octylmethoxycinnamate; C005290:oxybenzone; D008628:Mercury; D000432:Methanol; D000077286:Cetrimonium