Electrochemical reduction of the mycotoxin citrinin at bare and modified with multi-walled carbon nanotubes glassy carbon electrodes in a non-aqueous reaction medium

Journal of the Brazilian Chemical Society

Vanessa G. L. Zachetti²  Adrian M. Granero²  Sebastian N. Robledo¹  María A. Zon²  Carlos A. Darocha Rosa¹  Héctor Fernández² 

[1] ,Facultad de Ciencias Exactas, Físico-Químicas y Naturales Departamento de Química Río Cuarto,Argentina

关键词: citrinin;    mycotoxins;    multi-walled carbon nanotubes;    cyclic voltammetry;    square wave voltammetry;   

DOI  :  10.1590/S0103-50532012000600019

来源: SciELO

【 摘 要 】

Electrochemical reduction mechanism of citrinin in acetonitrile plus 0.1 mol L-1 (C4H9)4NClO4 at both bare and modified with multi-walled carbon nanotube glassy carbon (GC) electrodes was investigated by cyclic voltammetry and controlled potential electrolysis. Results allowed to infer a complex electroreduction mechanism with chemical and electrochemical steps coupled to the initial electron transfer reaction. Citrinin shows a single cathodic peak that corresponds at least to two electron reduction steps and two homogeneous chemical reactions, conforming to an ECEC (electron-transfer coupled with proton acceptance) self-protonation mechanism. The chemical reactions are originated in the intermolecular proton transfers from the substrate to its basic reduction intermediates, featuring a self-protonation mechanism. Kinetics analysis by simulation procedures of voltammetric results permitted a fully characterization of the mechanism of citrinin heterogeneous reduction.

【 授权许可】

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