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Electrochemical Studies of Ochratoxin A Mycotoxin at Gold Electrodes Modified with Cysteamine Self‐Assembled Monolayers. Its Ultrasensitive Quantification in Red Wine Samples
Author(s) -
Perrotta Patricio René,
Vettorazzi Nelio Roberto,
Arévalo Fernando Javier,
Granero Adrián Marcelo,
Chulze Sofía Noemí,
Zón María Alicia,
Fernández Héctor
Publication year - 2011
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201100094
Subject(s) - ochratoxin a , wine , repeatability , detection limit , chemistry , chromatography , cysteamine , monolayer , electrochemistry , voltammetry , mycotoxin , electrode , analytical chemistry (journal) , food science , organic chemistry , biochemistry
The quantification of ochratoxin A is studied at cysteamine self‐assembled monolayer modified gold electrodes in red wine samples by square wave voltammetry. Detection and quantification limits of 0.004 µg L −1 and 0.012 µg L −1 , respectively, were determined. The recovery percentages were in the range from 146 % to 94.0 % at spiking levels ranging from 0.02 to 5 µg L −1 . The variation coefficients for within‐laboratory repeatability varied from 31.4 to 11.5 % for spiked level from 0.02 to 2.0 µg L −1 . The developed electrochemical method is efficient, reproducible, and ultrasensitive for the quantification of OTA in red wine samples.