title: Multiresidue analytical method for the determination of eight penicillin antibiotics in muscle tissue by ion-pair reversed-phase HPLC after precolumn derivatization.
abstract: A high-performance liquid chromatographic multiresidue method was developed for the determination of 8 penicillin compounds (benzylpenicillin, phenoxymethylpenicillin, ampicillin, amoxicillin, nafcillin, oxacillin, cloxacillin, and dicloxacillin) at trace levels in muscle tissue. This method involves extraction of the penicillins with phosphate buffer pH 9 followed by cleanup and concentration on a C18 solid-phase extraction column and reaction with benzoic anhydride at 50 degrees C for 5 min and with 1,2,4-triazole and mercury(II) chloride solution pH 9 at 65 degrees C for 10 min. The derivatized compounds are eluted on a C8 column with a mobile phase containing acetonitrile and phosphate buffer (pH 6; 0.1 mol/L) loaded with sodium thiosulfate and ion-pairing tetrabutylammonium hydrogenosulphate. The method detection limit is approximately 3-11 micrograms/kg and the limit of determination was evaluated down to 25 micrograms/kg in line with the criteria of the EU decision No. 93/256/EEC.
authors.affiliation: Agence Française de Sécurité Sanitaire des Aliments, Laboratoire des Médicaments Vétérinaires, Fougères, France.
authors.forename: E
authors.initials: E
authors.lastname: Verdon
authors.forename: P
authors.initials: P
authors.lastname: Couëdor
mesh_terms: D000818:Animals; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D004350:Drug Residues / Q000032:analysis*; D004355:Drug Stability; D016014:Linear Models; D009132:Muscles / Q000737:chemistry*; D010406:Penicillins / Q000032:analysis*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D010406:Penicillins