This study investigated the content of aflatoxin, ochratoxin A, zearalenone, deoxynivalenol and fumonisin B1 in some food product. Samples were extracted and cleaned by QUEChERS approach. The extract was measured by liquid chromatography tandem mass spectrometry. The positive samples were reconfirmed by standard methods using immunoaffinity extraction. The detection limit of the method for aflatoxin, fumonisin B1, ochratoxin A, deoxynivalenol, zearalenone were 0.5, 30, 0.5, 60, and 3.0 µg/kg, respectively. The recoveries of all analytes were in the range of 70 - 110%. The repeatability coefficient of variation were in the range of 5,1 - 13%. Among the 300 food samples tested, there were 43 samples detected with studied mycotoxins, accounting for 14.3%, mainly focusing on unprocessed cereals. In which, 10 spice samples, 04 peanuts and sesame samples, 01 candy sample, 01 sample of nutritious cereal flour, and 01 food supplement sample were found to be contaminated with aflatoxin, ochratoxin A exceeding the maximum level of Ministry Of Health according to QCVN 8-1 : 2011/BYT.
LC-MS/MS, aflatoxin, ochratoxin A, deoxynivalenol, zearalenone, fumonisin B1
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