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

Author(s)

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

Affiliation

^[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

• Document type: Journal article
• Source: JOURNAL OF ELECTROANALYTICAL CHEMISTRY; v. 840, p. 21-26, MAY 1 2019.
• Web of Science Citations: 1

Abstract

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)

• FAPESP's process: 17/21898-6 - New conductive devices for application in electrochemical sensing and biosensing
• Grantee: Bruno Campos Janegitz
• Support Opportunities: Regular Research Grants
• FAPESP's process: 17/24618-4 - Determination of Fenitrothion in environmental samples using a glassy carbon electrode modified with single-wall carbon nanohorns and zein
• Grantee: Marina Paes Machado Itkes
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• FAPESP's process: 11/13312-5 - Development and application of carbon and nanoparticles base electrodes for the determination of species of interest in different matrices
• Grantee: Orlando Fatibello Filho
• Support Opportunities: Regular Research Grants