Determination of 30 Kinds of Antiparasitic Drugs in Animal-derived Foods by QuEChERS-UPLC-MS/MS

Objective: A method for determining the residues of 30 antiparasitic drugs in animal-derived food using ultra-high-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) was established. Methods: The samples were extracted with acetonitrile and 1% ammonia acetic ether and purified by QuEChERS. After purification, Waters ACQUITY UPLC^TM BEH C₁₈ column was used for separation, and a gradient elution of 10 mmol/L ammonium formate (containing 0.1% formic acid) aqueous solution, acetonitrile:methanol (50:50, v:v) was performed as the mobile phase. Detection was carried out using electrospray ionization (ESI) in both positive and negative ion modes using multiple reaction monitoring (MRM). Matrix-matched external standard quantification was used. Results: Under the optimized conditions, the 30 antiparasitic drugs showed good linearity within their respective linear ranges, with coefficient of determination (r²) greater than 0.99. The recoveries ranged from 70.1% to 111%, and the relative standard deviations were between 0.10% and 9.1% (n=6). The method detection limit ranged from 0.001 to 0.3 μg/kg, and the method quantification limit ranged from 0.004 to 1 μg/kg. Conclusion: The method is sensitive, accurate, and exhibits good repeatability and stability, making it suitable for detecting various antiparasitic drug residues in animal-derived food.