title: Development of a gas chromatographic-mass spectrometric method using multiple analytes for the confirmatory analysis of anabolic steroid residues in horse urine. II. Detection of administration of 19-nortestosterone phenylpropionate to equine male castrates and fillies.
abstract: Esters of 19-nortestosterone form an important group of anabolic preparations used in veterinary practice. Based upon results from detailed metabolic studies for 19-nortestosterone in the horse, a method to confirm the administration of anabolic preparations of this steroid to castrated male horses and fillies is described; the method is based upon the use of multiple analytes. Following administration of the anabolic preparations, solid-phase extraction of urinary conjugates and the separation of the conjugate groups prior to hydrolysis allow for the determination of specific metabolites conjugated with either glucuronic acid or sulphate. Following hydrolysis of the conjugates, purification of the free neutral steroids on thin-layer chromatography, derivatisation and gas chromatographic-mass spectrometric analysis, the presence of the major metabolites, estrane-3,17 alpha-diol in the glucuronic acid fraction and 19-nortestosterone and two isomers of estrane-3,17-diol in the sulphate fraction, could be confirmed for 17-18 days after administration of Nandrolin (19-nortestosterone phenylpropionate).
mesh_terms: D045930:Anabolic Agents / Q000652:urine*; D000818:Animals; D002369:Castration; D005260:Female; D008401:Gas Chromatography-Mass Spectrometry; D006736:Horses; D008297:Male; D009277:Nandrolone / Q000031:analogs & derivatives* / Q000652:urine; D012737:Sex Factors; D012997:Solvents
chemical_list: D045930:Anabolic Agents; D012997:Solvents; D009277:Nandrolone; C008580:nandrolone phenpropionate