Determination of 17 Mycotoxins in Milk and Dairy Products by High Performance Liquid Chromatography-Tandem Mass Spectrometry

To establish a method for simultaneous detection of 17 mycotoxins in milk and dairy products based on high performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS). Samples (5.0000 g) were added to 20 μL of a mixed solution of isotope-labeled internal standards, extracted with 20 mL of acetonitrile-water-formic acid solution (70:29:1, V/V) by vortex shaking, salted out with 0.3 g of sodium chloride, and then centrifuged at high speed. The supernatant was passed through a 0.22 μm membrane filter, detected by triple quadrupole mass spectrometry in the multi-reaction detection mode and quantified by an internal standard method. Results: Under the optimized instrumental conditions, good linearity was observed for the 17 mycotoxins in the tested concentration ranges, with correlation coefficient (r) greater than 0.99. The limit of detection (LOD) was 0.05-6.20 μg/kg, and the limit of quantitation (LOQ) was 0.2-20.0 μg/kg. Good average recoveries (78.9%-119.5%) and precision (relative standard deviations (RSDs) 0.2%-8.4%) were achieved at three spiked levels. The method is convenient, stable, reliable and sensitive, can meet the requirements of qualitative and quantitative analysis of the 17 mycotoxins in milk and dairy products, and is suitable for laboratory monitoring of the contamination of these mycotoxins in milk and dairy products.