title: Development of a multi-class method for the quantification of veterinary drug residues in feedingstuffs by liquid chromatography-tandem mass spectrometry.
abstract: A simple multi-residue method was developed for detecting and quantifying 33 analytes from 13 classes of antibiotics (tetracyclines (3), quinolones (7), penicillins (3), ionophore coccidiostats (7), macrolides (3), sulfonamides (1), quinoxalines (2), phenicols (2), lincosamides (1), diaminopyrimidines (1), polypeptides (1), streptogramins (1) and pleuromutilins (1)) in animal feeds. Extraction and clean-up procedures were optimized with spiked piglet feed. Samples were extracted by ultrasonic-assisted extraction with a mixture of methanol/acetonitrile/McIlvaine buffer at pH 4.6 (37.5/37.5/25, v/v/v) containing 0.3% of EDTA-Na(2), followed by a clean up using a dispersive solid-phase extraction (d-SPE) with PSA (primary secondary amine). Detection of antibiotics was achieved by liquid chromatography-electrospray tandem mass spectrometry (LC-ESI-MS/MS) within 28 min using both positive and negative ESI mode. Average recoveries ranged from 51% (oxytetracycline) to 116% (tilmicosin) with associated relative standard deviations of 7.3% and 9.0% and an overall mean of 87%. Limits of quantification ranged from 3.8 ngg(-1) (lincomycin) to 65.0 ngg(-1) (bacitracin). Following optimization, the method was further verified for bovine and lamb feeding stuffs; negative matrix effects were evaluated and overcome by a standard addition method.
authors.affiliation: Public Research Center - Gabriel Lippmann, Department Environment and Agro-Biotechnologies, Belvaux, Luxembourg.
authors.forename: Aurore
authors.initials: A
authors.lastname: Boscher
authors.forename: Cédric
authors.initials: C
authors.lastname: Guignard
authors.forename: Terence
authors.initials: T
authors.lastname: Pellet
authors.forename: Lucien
authors.initials: L
authors.lastname: Hoffmann
authors.forename: Torsten
authors.initials: T
authors.lastname: Bohn
mesh_terms: D000704:Analysis of Variance; D000821:Animal Feed / Q000032:analysis*; D000900:Anti-Bacterial Agents / Q000032:analysis; D002853:Chromatography, Liquid / Q000379:methods*; D004350:Drug Residues / Q000032:analysis; D016014:Linear Models; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D052616:Solid Phase Extraction; D053719:Tandem Mass Spectrometry / Q000379:methods*; D013696:Temperature; D019155:Veterinary Drugs / Q000032:analysis*
chemical_list: D000900:Anti-Bacterial Agents; D019155:Veterinary Drugs