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  • Biotransformation of 17-alkyl steroids in the equine: high-performance liquid chromatography-mass spectrometric and gas chromatography-mass spectrometric analysis of fluoxymesterone metabolites in urine samples.

Biotransformation of 17-alkyl steroids in the equine: high-performance liquid chromatography-mass spectrometric and gas chromatography-mass spectrometric analysis of fluoxymesterone metabolites in urine samples.

Journal of chromatography. B, Biomedical sciences and applications (1998-03-28)
S M Stanley, S Kent, J P Rodgers
ABSTRACT

In this study the equine metabolism of fluoxymesterone (9alpha-fluoro-11beta-17beta-dihydroxy-17alpha-meth ylandrost-4-ene-3-one) given orally has been investigated. The parent material was not detected, but two major 16-hydroxy metabolites which corresponded to a mono- and a di-hydroxylation product were evident. One of the hydroxylation positions was identified as C-16. Phase II metabolism in the form of glucuronide formation was also common. These steroids will provide target compounds for confirming abuse of this drug in the horse.