title: Confirmatory method for the determination of nandrolone and trenbolone in urine samples using immunoaffinity cleanup and liquid chromatography-tandem mass spectrometry.
abstract: A confirmatory method for the simultaneous determination of nandrolone (alpha and beta) and trenbolone (alpha and beta) in urine samples by liquid chromatography electrospray mass spectrometry (LC-MS-MS) was developed. After an enzymatic deconjugation, the urine was subjected to a one-step cleanup on a commercially available immunoaffinity chromatography cartridge. The analytes were detected by liquid chromatography-positive ion electrospray tandem mass spectrometry using deuterium labelled internal standards. The analytical procedure was applicable to bovine and swine urine samples. The procedure was validated as a quantitative confirmatory method according to the Commission Decision 2002/657/EC criteria. The results obtained showed that the method was suitable for statutory residues testing regarding the following performance characteristics: instrumental linearity, specificity, precision (repeatability and intra-laboratory reproducibility), recovery, decision limit (CCalpha), detection capability (CCbeta) and ruggedness. The decision limits (CCalpha) obtained, were between 0.54 and 0.60 microg L(-1); the recovery was above 64% for all the analytes. Repeatability was between 1.6% and 5.7% and within-laboratory reproducibility between 1.6% and 6.0% for all the steroids.
authors.affiliation: Istituto Zooprofilattico Sperimentale della Lombardia e dell'Emilia Romagna, B Ubertini, 25124 Brescia, Italy. mara.gasparini@izsler.it
authors.forename: Mara
authors.initials: M
authors.lastname: Gasparini
authors.forename: Michele
authors.initials: M
authors.lastname: Curatolo
authors.forename: Walter
authors.initials: W
authors.lastname: Assini
authors.forename: Eros
authors.initials: E
authors.lastname: Bozzoni
authors.forename: Nadia
authors.initials: N
authors.lastname: Tognoli
authors.forename: Guglielmo
authors.initials: G
authors.lastname: Dusi
mesh_terms: D000818:Animals; D002417:Cattle; D002846:Chromatography, Affinity / Q000379:methods* / Q000662:veterinary; D002853:Chromatography, Liquid / Q000379:methods* / Q000662:veterinary; D009277:Nandrolone / Q000652:urine*; D013552:Swine; D053719:Tandem Mass Spectrometry / Q000379:methods* / Q000662:veterinary; D045165:Testosterone Congeners / Q000652:urine*; D014204:Trenbolone Acetate / Q000652:urine*
chemical_list: D045165:Testosterone Congeners; D009277:Nandrolone; D014204:Trenbolone Acetate