Simultaneous electrochemical determination of three sunscreens using cetyltrimethylammonium bromide.
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.
Cardoso
Juliano Carvalho
JC
Department of Chemistry, CCET, Universidade Federal de Mato Grosso do Sul, Av. Filinto Muller, 1555, PO Box 549, Campo Grande, MS 79074-460, Brazil.
Armondes
Bruna Milca Lenzi
BM
Ferreira
João Bosco Galindo Júnior e Valdir Souza
JB
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*
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