Journal
ANALYTICA CHIMICA ACTA
Volume 588, Issue 2, Pages 283-291Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2007.02.029
Keywords
ochratoxin A; deoxyribonucleic acid; oxidative damage; oxidation; voltammetry; electroanalytical determination; interferences
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Ochraroxin A (CTA) is a fungal metabolite that occurs in foods, beverages, animal tissues, human blood and presents carcinogenic, teratogenic and nephrotoxic properties. This study concerns the redox properties of OTA using electrochemical techniques which have the potential for providing insights into the biological redox reactions of this molecule. The in situ evaluation of the OTA interaction with DNA using a DNA-electrochemical biosenso: is also rcported. The oxidation of OTA is an irreversible process proceeds with the transfer of one electron and one proton in a diffusion-controlled mechanism. The diffiusion coefficient of OTA was calculated in pH 7 phosphate buffer to be Do = 3.65 x 10-(6) cm(2) s(.)(-1) The oxidation of OTA is also pH dependent for electrolytes with pH < 7 and involves the formation of a main oxidation product which adsorbs strongly at the GCE surface undergoing reversible oxidation. In alkaline electrolytes OTA undergoes chemical deprotonation, the oxidation involving only the transfer of one electron. The electrochemical dsDNA-biosensor was also used to evaluate the possible interaction between OTA and DNA. The experiments have clearly proven that OTA interacts and binds to dsDNA strands immobilized onto a GCE surface, but no evidence of DNA-damage caused by OTA was obtained (c) 2007 Elsevier B.V. All rights reserved.
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