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摘要
A simple, reliable, and fast multiresidue method has been developed for the determination of 17 veterinary drugs belonging to several families (macrolides, sulfonamides, and anthelmintics) in cheese at trace levels. Ultra-high-performance LC coupled to MS/MS has been used for the analysis of these compounds in less than 9 min. Veterinary drug residues have been extracted from cheese samples using a QuEChERS (quick, easy, cheap, effective, rugged, and safe)-based extraction procedure without applying any further clean-up step. Matrix-matched calibration was used for quantification and recoveries were calculated at three concentration levels (10, 50, and 100 mu g/kg). The obtained values ranged from 70 to 110% for the selected compounds except for tylosin and josamycin at 100 mu g/kg (111.7 and 112.7%, respectively). Intra- and interday precision were also evaluated and RSDs were lower than 25% in all the cases. LOQs ranged from 0.3 mu g/kg (for thiabendazole, oxfendazole, mebendazole, josamycin, and fenbendazole) to 10.5 mu g/kg (abamectin), whereas decision limit and detection capability ranged from 2.3 (thiabendazole) to 11.3 (abamectin) and 4.2 (thiabendazole) to 14.3 mu g/kg (abamectin), respectively. Finally, 13 samples were analyzed and traces of thiabendazole were detected in two different cheeses.
- 出版日期2013-4
