title: The analysis of trenbolone and the human urinary metabolites of trenbolone acetate by gas chromatography/mass spectrometry and gas chromatography/tandem mass spectrometry.
abstract: The electron impact mass spectrometric properties of trimethylsilyl ether and fluoroacyl ester derivatives of trenbolone, combined or not combined with a methoxime group, are presented. Some derivatization problems were observed and were due to the formation of enol derivatives at the 3C-position in several tautomeric forms, which in their turn were not stable and lost two or four hydrogens under the conditions studied. The enolization could be minimized by carefully selecting the reaction conditions or could be prevented by the introduction of a methoxime group at the 3C-position. The limits of detection and identification of the methoxime heptafluorobutyryl ester and the methoxime trimethylsilyl ether derivative of trenbolone were determined using a mass selective detector in the electron impact mode and a triple-stage quadrupole in the methane positive chemical ionization mode. Selected reaction monitoring in tandem mass spectrometry did not improve the limit of detection, but because of the gain in selectivity did improve the limit of identification. The glucuronides of trenbolone and epitrenbolone could be identified in three urine specimens out of 200 samples in routine doping control.
authors.affiliation: Netherlands Institute for Drugs and Doping Research, University of Utrecht.
authors.forename: D
authors.initials: D
authors.lastname: de Boer
authors.forename: M E
authors.initials: ME
authors.lastname: Gainza Bernal
authors.forename: R D
authors.initials: RD
authors.lastname: van Ooyen
authors.forename: R A
authors.initials: RA
authors.lastname: Maes
mesh_terms: D005463:Fluoroacetates; D008401:Gas Chromatography-Mass Spectrometry; D006801:Humans; D007202:Indicators and Reagents; D008729:Methoxamine; D013256:Steroids / Q000652:urine; D014204:Trenbolone Acetate / Q000031:analogs & derivatives* / Q000652:urine*; D014297:Trimethylsilyl Compounds
chemical_list: D005463:Fluoroacetates; D007202:Indicators and Reagents; D013256:Steroids; D014297:Trimethylsilyl Compounds; C014815:fluoroacetic acid; D008729:Methoxamine; D014204:Trenbolone Acetate