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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Use of a composite electrode modified with magnetic particles for electroanalysis of azo dye removed from dyed hair strands

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Autor(es):
Correa, Glaucia Tinoco ; Tanaka, Auro Atsuchi ; Isabel Pividori, Maria ; Boldrin Zanoni, Maria Valnice
Número total de Autores: 4
Tipo de documento: Artigo Científico
Fonte: Journal of Electroanalytical Chemistry; v. 782, p. 26-31, DEC 1 2016.
Citações Web of Science: 2
Resumo

The analysis of dyes in hair samples can provide useful information for forensic purposes. The present work describes a novel method for the extraction of dye from a hair sample and its determination using a composite electrode to pre-concentrate carboxyl-functionalyzed magnetic nanoparticles (CFMP) employed to collect the dye in solution, hence increasing the sensitivity of the analysis. The Basic Brown 16 dye, which is widely used in temporary hair dying, was chosen as a model compound. After 15 s of reaction between 1.5 x 10(-5) mol L-1 of dye and 0.1 mg mL(-1) of carboxyl-functionalyzed magnetic nanoparticles in phosphate buffer electrolyte at pH 7.0, the derivative dye was collected during 40 s at the graphite-epoxy composite electrode and then transferred to a new solution of phosphate buffer at pH 7.0. The dye presented a peak current at a potential of 0.42 V that was almost 400 times higher than without the preconcentration step, suggesting that the dye was pre-accumulated due to strong magnetic interaction with the composite electrode. Under optimized conditions, the analytical curve constructed using square wave voltammetry was linear for BB16 dye concentrations between 1.00 x 10(-7) and 1.00 x 10(-6) mol L-1. The limits of detection and quantification were 1.01 x 10(-8) and 237 x 10(-8) mol L-1, respectively. The proposed method was successfully applied in the determination of BB16 dye extracted from a dyed hair strand sample by alkaline digestion. (C) 2016 Elsevier B.V. All rights reserved. (AU)

Processo FAPESP: 08/10449-7 - Avaliação da ocorrência, toxicidade/genotoxicidade e processos para degradação de corantes em efluentes e águas superficiais
Beneficiário:Maria Valnice Boldrin
Linha de fomento: Auxílio à Pesquisa - Temático
Processo FAPESP: 13/21542-6 - Nanopartículas magnéticas modificadas com tosyl e carboxilatos aplicados na determinação de corantes em cabelo
Beneficiário:Gláucia Tinoco Corrêa
Linha de fomento: Bolsas no Brasil - Doutorado