Modified magnetic nanoparticles in an electrochemical method for the ochratoxin A determination in Vitis vinifera red grapes tissues

MARTÍN A. FERNÁNDEZ-BALDO; FRANCO A. BERTOLINO; GERMÁN A. MESSINA; MARIA I. SANZ; JULIO RABA

TALANTA

ELSEVIER SCIENCE BV

Año: 2010 vol. 83 p. 651 - 657

0039-9140

This work described the development and characterization of an electrochemical method using squarewave voltammetry (SWV) combined with the use of modified magnetic nanoparticles (MNPs), which hadshown a rapid and sensitive determination of ochratoxin A (OTA) in wine grapes (Cabernet Sauvignon,Malbec and Syrah) post-harvest tissues. The wine grapes were inoculated with Aspergillus ochraceus toobtain OTA in artificially infected samples. The OTA was directly determined using square-wave voltammetry.The current obtained is directly proportional to the concentration of OTA present in the samples.This method has been used for OTA determination in wine grapes and it was validated against a commercialELISA test kit. The limits of detection calculated for electrochemical detection and the ELISA were0.02 and 1.9gkg−1, respectively and the coefficients of variation for accuracy and precision dates werebelow 5.5%. This method promises to be suitable for the detection and quantification of OTA in apparentlyhealthy fruits post-harvest for assuring safety and quality of food as well as consumer’s health