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An analytical method was developed to determine the amount of spinetoram (spinetoram J andspinetoram L) in livestock samples. The spinetoram was extracted with acetonitrile and purified through a primarysecondary amine (PSA) sorbent. The spinetoram residues were then quantified and confirmed using a liquidchromatography–tandem mass spectrometer (LC-MS/MS) in the positive ion mode using multiple reactionsmonitoring (MRM). Matrix-matched calibration curves were linear over the calibration ranges (0.005-0.5 mg/kg)into a blank extract with r 2 > 0.994. The limits of detection and quantification were 0.002 and 0.01 mg/kg,respectively. The recovery results of spinetram ranged between 81.9-106.4% at different concentration levels (LOQ,10LOQ, 50LOQ, n=5) with relative standard deviations (RSDs) less than 10%. All values were consistent withthe criteria ranges requested in the Codex guidelines (CAC/GL40, 2003). An interlaboratory study was conductedto validate the method. The proposed analytical method proved to be accurate, effective, and sensitive for spinetoramdetermination. The method will be used as an official analytical method in Korea.:         spinetoram        ,   ,       . Spinetoram    LC-MS/MS  , acetonitrile   PSA  d-SPE

Development of analytical method for determination of spinetoram residues in livestock using LC-MS/MS