Application of Stable Isotope Dilution and Liquid Chromatography Tandem Mass Spectrometry for Multi-Mycotoxin...

Background: Mycotoxin contamination in oils remains an important food safety issue. To monitor the occurrence of mycotoxins in edible oils, it is important to develop analytical methods that can determine multiple mycotoxins in oil products. A stable isotope dilution LC-tandem MS (LC-MS/MS) method for the simultaneous determination of 12 mycotoxins in five edible oil matrixes (canola, corn, olive, peanut, and soybean oil) was developed and validated. Methods: Prior to extraction, the oil samples were fortified with ¹³C uniformly labeled internal standards (¹³C-IS) for 12 target mycotoxins, followed by extraction and LC-MS/MS analysis. Quantitation was achieved using solvent-only calibration standards, relative response factors of ¹³C-IS, and target mycotoxins. Results: The majority of recoveries in oil for ochratoxin A and aflatoxins B1, B2, G1, and G2 fortified at 1, 10, and 100 ng/g as well as deoxynivalenol; fumonisins B1, B2, and B3; T-2 toxin; HT-2 toxin; and zearalenone fortified at 10, 100, and 1000 ng/g ranged from 80 to 120% with RSDs of <20%. The method LOQs ranged from 0.1 ng/g (aflatoxin B1) to 6.4 ng/g (zearalenone). Among 16 U.S. market samples, zearalenone was detected in three corn oil samples at 37, 185, and 317 ng/g, respectively. T-2 toxin was found in two corn oil samples at 7 and 10 ng/g, respectively. Conclusions: The method provides sufficient selectivity, sensitivity, accuracy, and repeatability to screen edible oils for regulated mycotoxins such as aflatoxins at low nanogram per gram concentrations without using conventional standard addition or matrix-matched calibration standards to correct for matrix effects.