Abstract: A method is presented for the determination of clopidol residue in poultry products by liquid chromatography-electrospray ion trap tandem mass spectrometry (LC-ESI-MS/MS). Clopidol residue was extracted with methanol and cleaned-up by n-hexane from different poultry products. The extract was cleaned-up by an LC-18 column and an ion exchange solid phase extraction (SPE) column. Quantification was achieved by matrix calibration. The recoveries of clopidol in poultry products were in the range from 55.38% to 132.44% at the four spiked levels, 2, 5, 10, and 20 μg/kg. The intra-day relative standard deviation (RSD) and inter-day RSD were less than 9.54% and 15.27%, respectively. The linearity of the method was good from 1 μg/kg to 40 μg/kg. The limit of detection (LOD) was 0.5 μg/kg, and the limit of quantification (LOQ) was 2.0 μg/kg. The method is selective without interference and suitable for the determination and confirmation of clopidol residue in poultry products.

Key words: clopidol, matrix effect , poultry products, solid phase extraction (SPE), liquid chromatography-electrospray ion trap tandem mass spectrometry (LC-ESI-MS/MS)