Flow injection simultaneous determination of synthetic colorants in food using multiple pulse amperometric detection with a boron-doped diamond electrode

Autor(es)

Medeiros, Roberta A. ^[1] ; Lourencao, Bruna C. ^[1] ; Rocha-Filho, Romeu C. ^[1] ; Fatibello-Filho, Orlando ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Dept Quim, BR-13560970 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Talanta; v. 99, p. 883-889, SEP 15 2012.
• Citações Web of Science: 58

Resumo

A single-line flow injection system and multiple pulse amperometric detection using a boron-doped diamond electrode were employed to develop and optimize a simple, low-cost, and rapid method for the simultaneous determination of two pairs of food colorants: tartrazine and sunset yellow (TT-SY) or brilliant blue and SY (BB-SY). A dual-potential waveform was used: E-det.1 = - 150 mV (400 ms duration) and E-det.2 = - 450 mV (100 ms duration) vs. Ag/AgCl (3.0 mol L-1 KCl). Polarization at E-det.1 or E-det.2 causes reduction of SY or the respective pair of colorants, TT-SY or BB-SY; hence, with proper current correction, both colorants in each pair can be determined. The obtained linear response ranges (detection limits) were 5.0-60.0 (2.5) and 1.0-50.0 (0.80) mu mol L-1, for TT and SY, or 5.0-60.0 (3.5) and 1.0-50.0 (0.85) mu mol L-1, for BB and SY, respectively. Investigation of possible interferents (other food colorants or additives) showed no significant interference with the methods here proposed, which were then used to simultaneously determine the pairs of colorants in industrialized food samples, with results that showed good agreement with those obtained using a comparative HPLC method. (C) 2012 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 11/00601-9 - Aplicação de eletrodos de diamante dopado com boro e de nitreto de carbono amorfo para a determinação simultânea de fármacos de diferentes grupos terapêuticos em formulações farmacêuticas e em urina
• Beneficiário: Roberta Antigo Medeiros
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado