Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 840, Issue -, Pages 21-26Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2019.03.055
Keywords
Fenitrothion; Natural water analysis; Juices analysis; Electroanalysis; Single-wall carbon nanohorns; Zein
Categories
Funding
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [2011/13312-5, 2017/21898-6, 2017/24618-4]
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [11/13312-5] Funding Source: FAPESP
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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.
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