Voltammetric sensing of fenitrothion in natural water and orange juice samples using a single-walled carbon nanohorns and zein modified sensor

Autor(es)

Itkes, Marina P. M. ^[1] ; de Oliveira, Geiser G. ^[2] ; Silva, Tiago Almeida ^{[3, 4]} ; Fatibello-Filho, Orlando ^[3] ; Janegitz, Bruno C. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Dept Nat Sci Math & Educ, BR-13600970 Araras, SP - Brazil

^[2] Fed Univ Tocantis, BR-77402970 Gurupi, TO - Brazil

^[3] Univ Fed Sao Carlos, Dept Chem, BR-13565970 Sao Carlos, SP - Brazil

^[4] Fed Ctr Technol Educ Minas Gerais, Dept Met & Chem, BR-35180008 Timoteo, MG - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF ELECTROANALYTICAL CHEMISTRY; v. 840, p. 21-26, MAY 1 2019.
• Citações Web of Science: 1

Resumo

A glassy carbon electrode (GCE) modified with single-walled carbon nanohorns (SWCNH) and zein (ZE), a prolamin type-protein fmd in maize, for the differential pulse adsorptive cathodic stripping voltammetric determination of fenitrothion (FT) is proposed. The proposed film was characterized by scanning electron microscopy, cyclic voltammetry and electrochemical impedance spectroscopy. Regarding the electrochemical characterization, comparing the results obtained by cyclic voltammetry and electrochemical impedance spectroscopy, the modified electrode (SWCNH-ZE/GCE) showed an electroactive surface area 3 times higher and faster electron transfer kinetic than bare GCE. By using differential pulse adsorptive cathodic stripping voltammetry and SWCNH-ZE/GCE the analytical curve exhibited a linear response ranging of 9.9 x 10(-7) to 1.2 x 10(-5) mol L-1, with a limit of detection of 1.2 x 10(-8) mol L-1. The proposed sensor was successfully applied for the determination of FT pesticide in natural water and orange juice samples. Moreover, the electrochemical sensor showed good repeatability and reproducibility arising from the excellent film stability, suggesting that the proposed architecture has broad potential for applications in sensing and biosensing. (AU)

• Processo FAPESP: 17/21898-6 - Novos dispositivos condutores para aplicação em sensores e biossensores eletroquímicos
• Beneficiário: Bruno Campos Janegitz
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 17/24618-4 - Determinação de Fenitrothion em amostras ambientais usando eletrodo de carbono vítreo modificado com filme de nanochifres de carbono de parede simples e zeína
• Beneficiário: Marina Paes Machado Itkes
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 11/13312-5 - Desenvolvimento e aplicação de eletrodos à base de carbono e nanopartículas para a determinação de espécies de interesse em diferentes matrizes
• Beneficiário: Orlando Fatibello Filho
• Modalidade de apoio: Auxílio à Pesquisa - Regular