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A quantitative LC-MS/MS method has been developed for simultaneous determination of bacitracin A, bacitracin B, colistin A, colistin B and virginiamycin M 1  in feed. This rapid simple and effective extraction method was based on matrix solid-phase dispersion. Qualitative and quantitative analyses were performed by LC-ESI-MS/MS. CC β  of polypeptide antibiotics upon the method ranged from 9.6 to 15.8 μg kg −1  and 19.4 to 27.5 μg kg −1 , respectively. The limit of quantification of polypeptide antibiotics was 25 μg kg −1  in feed samples. The recoveries of polypeptide antibiotics spiked in feed samples at a concentration range of 25–100 μg kg −1  were found above 75.9–87.9% with relative standard deviations within days less than 15.7% and between days less than 20.6%. This rapid and reliable method can be used to efficiently separate, characterize and quantify the residues of polypeptide antibiotics in feed with advantages of simple pretreatment and environmental friendly.

journal of chromatographic science

Analysis of Major Components of Bacitracin, Colistin and Virginiamycin in Feed Using Matrix Solid-phase Dispersion Extraction by Liquid Chromatography-electrospray Ionization Tandem Mass Spectrometry