Sensitive determination of carbendazim in orange juice by electrode modified with hybrid material

Autor(es)

Razzino, Claudia A. ^[1] ; Sgobbi, Livia F. ^[1] ; Canevari, Thiago C. ^[1] ; Cancino, Juliana ^[2] ; Machado, Sergio A. S. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil

^[2] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Food Chemistry; v. 170, p. 360-365, MAR 1 2015.
• Citações Web of Science: 33

Resumo

This paper describes the application of a glassy carbon electrode modified with a thin film of mesoporous silica/multiwalled carbon nanotubes for voltammetric determination of the fungicide carbendazim (CBZ). The hybrid material, (SiO2/MWCNT), was obtained by a sol-gel process using HF as the catalyst. The amperometric response to CBZ was measured at +0.73 V vs. Ag/AgCl by square wave voltammetry at pH 8.0. SiO2/MWCNT/GCE responded to CBZ in the linear range from 0.2 to 4.0 mu mol L-1. The calculated detection limit was 0.056 mu mol L-1, obtained using statistical methods. The SiO2/MWCNT/GCE sensor presented as the main characteristics high sensitivity, low detection limit and robustness, allowing CBZ determination in untreated real samples. In addition, this strategy afforded remarkable selectivity for CBZ against ascorbic and citric acid which are the main compounds of the orange juice. The excellent sensitivity and selectivity yielded feasible application for CBZ detection in orange juice sample. (C) 2014 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 11/10231-4 - Monitoramento da contaminação de águas de abastecimento utilizando sensores eletroquímicos baseados em nanotubos de carbono: parte 1: interferentes endócrinos
• Beneficiário: Sergio Antonio Spinola Machado
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 12/08750-6 - Desenvolvimento de um biossensor mimético descartável para pesticidas organofosforados e carbamatos para o controle de qualidade de águas de abastecimento
• Beneficiário: Lívia Flório Sgobbi
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 11/23047-7 - Desenvolvimento de biosensor eletroquímico utilizando sílica mesoporosa contendo nanotubos de carbono obtida pelo processo sol-gel. Determinação eletroquímica de pesticidas
• Beneficiário: Thiago da Cruz Canevari
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado