Abstract:
:The anabolic-androgenic steroid methylstenbolone (MSTEN; 2α,17α-dimethyl-17β-hydroxy-5α-androst-1-en-3-one) is available as a so-called designer steroid or nutritional supplement. It is occasionally detected in doping control samples, predominantly tested and confirmed as the glucuronic acid conjugate of methylstenbolone. The absence of other meaningful metabolites reported as target analytes for sports drug testing purposes can be explained by the advertised metabolic stability of methylstenbolone. In 2013, a first investigation into the human metabolism of methylstenbolone was published, and two hydroxylated metabolites were identified as potential targets for initial testing procedures in doping controls. These metabolites were not observed in recent doping control samples that yielded adverse analytical findings for methylstenbolone, and in the light of additional data originating from a recent publication on the in vivo metabolism of methylstenbolone in the horse, revisiting the metabolic reactions in humans appeared warranted. Therefore, deuterated methylstenbolone together with hydrogen isotope ratio mass spectrometry (IRMS) in combination with high accuracy/high resolution mass spectrometry were employed. After oral administration of a single dose of 10 mg of doubly labeled methylstenbolone, urine samples were collected for 29 days. Up to 40 different deuterated methylstenbolone metabolites were detected in post-administration samples, predominantly as glucuronic acid conjugates, and all were investigated regarding their potential to prolong the detection window for doping controls. Besides methylstenbolone excreted glucuronidated, three additional metabolites were still detectable at the end of the study on day 29. The most promising candidates for inclusion into routine sports drug testing methods (2α,17α-dimethyl-5α-androst-1-ene-3β,17β-diol and 2α,17α-dimethyl-5α-androst-1-ene-3α,17β-diol) were synthesized and characterized by NMR.
journal_name
Drug Test Analjournal_title
Drug testing and analysisauthors
Piper T,Fusshöller G,Schänzer W,Lagojda A,Kuehne D,Thevis Mdoi
10.1002/dta.2736subject
Has Abstractpub_date
2019-11-01 00:00:00pages
1644-1655issue
11-12eissn
1942-7603issn
1942-7611journal_volume
11pub_type
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