Abstract
A new multi-residue method for the determination of seven polypeptides, namely, polymixin B1, polymixin B2, polymixin E1 (colistin A), polymixin E2 (colistin B), enduracidin A (enramycin A), enduracidin B (enramycin B), and bacitracin A, in food of animal origin was developed and validated for chicken muscle tissue. Chicken muscle tissue was extracted with acidified methanol (1 % TFA). After homogenization, shaking, and centrifugation, the acidified methanol extract was decanted. A second extraction was performed with methanol (1 % TFA) and formic acid (1 %) 25:75, v/v. The pooled extract was cleaned up and concentrated on a solid-phase extraction cartridge. The retained analytes were eluted with methanol/acetonitrile. The extract was evaporated to dryness, reconstituted in mobile phase, filtered, and quantified by LC-MS/MS under ESI conditions. The method has a LOQ of 50.0 μg/kg for polymixin E2 (colistin B), 39.0 μg/kg for polymixin E1 (colistin A), 74.0 μg/kg for polymixin B1, 71.0 μg/kg for polymixin B2, 66.0 μg/kg for enduracidin A, 50.0 μg/kg for enduracidin B, and 30.0 μg/kg for bacitracin A in chicken muscle tissues. This is the first sensitive, suitable, multi-residue method reported for the seven polypeptide drug residues in chicken muscle tissue.
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Effect of chicken muscle tissue on the ESI +ve detection signal for Colistin A showing signal suppression in the presence of matrix
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Acknowledgment
The authors acknowledge Jana Kinar of the Canadian Food Inspection Agency (CFIA) Laboratory in Saskatoon for technical assistance in the laboratory.
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Mention of a company name or brand name does not constitute an endorsement by the Canadian Food Inspection Agency Laboratory in Saskatoon above others of a similar nature or product.
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Boison, J.O., Lee, S. & Matus, J. A multi-residue method for the determination of seven polypeptide drug residues in chicken muscle tissues by LC-MS/MS. Anal Bioanal Chem 407, 4065–4078 (2015). https://doi.org/10.1007/s00216-015-8644-z
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DOI: https://doi.org/10.1007/s00216-015-8644-z