RESUMEN
A rapid, sensitive, and reliable high-performance liquid chromatography tandem mass spectrometry (LC-MS/MS) method was developed and validated for the analysis of decoquinate in chicken tissues. The compounds were extracted using acetonitrile by liquid-liquid extraction (LLE) and purified with an Oasis(™) HLB solid-phase extraction (SPE) cartridge. Chromatographic separation was performed on an XTerra C18 reversed-phase column with a mobile phase of water containing 0.1% formic acid and acetonitrile. The analyte was detected by tandem quadrupole mass spectrometry after positive electrospray ionization by multiple reaction monitoring. The detection and quantitation limits were 1 and 2.5 µg/kg, respectively. The recoveries of edible tissues ranged from 85.3% to 104.9%, with relative standard deviations (RSD) lower than 10.4%. The depletion profile of decoquinate was studied in healthy chickens after oral administration of feed containing 27.2 mg/kg decoquinate for 10 consecutive days. The residue concentrations of decoquinate in chicken muscle and liver were detected using the developed method. The highest residue concentrations were attained 0.25 day post-treatment, and decoquinate residues were still detected 5 days postmedication in the tissues examined. The developed method has been successfully applied to the depletion study of decoquinate in chicken tissues. The recommended withdrawal period with oral administration based on our research is 3 days.