delta13C-values of endogenous urinary steroids

Publication: Contribution to journalJournal articlesResearch

Abstract

By means of gas chromatography/combustion/isotope ratio mass spectrometry (GC/C/IRMS) urinary steroids obtained from a reference population of 56 subjects were analyzed for their (13)C/(12)C-ratios. The analytes encompassed androsterone (A), etiocholanolone (E), 11beta-hydroxyetiocholanolone (OHE), 11beta-hydroxyandrosterone (OHA), and 5beta-pregnane- 3alpha,20alpha-diol (PD). A and E represent androgen metabolites (AM). PD, OHE, and OHA have sources independent from androgen metabolism. The delta(13)C-values of the latter compounds may be compared to those of AM in order to detect doping with synthetic androgens and thus may serve as endogenous reference compounds (ERC). In order to allow for classification of conspicuous samples, reference ranges and limits were calculated for delta(13)C-values of selected steroids and differences hereof (Delta(13)C-values). When A is compared to ERCs, Delta(13)C-values larger than 3 per thousand are very unlikely. A set of additional parameters was surveyed by a questionnaire. Several factors turned out to exert significant influence on the delta(13)C-values of urinary steroids. These encompass the identity of the steroid itself, sex, oral contraception, travels, and physical activity.

Original languageEnglish
JournalSteroids
Volume73
Issue number4
Pages (from-to)408-416
Number of pages9
ISSN0039-128X
DOIs
Publication statusPublished - 01.04.2008

Research areas and keywords

  • Adult
  • Androsterone
  • Carbon Isotopes
  • Chromatography, Gas
  • Chromatography, High Pressure Liquid
  • Doping in Sports
  • Etiocholanolone
  • Exercise
  • Female
  • Humans
  • Male
  • Mass Spectrometry
  • Models, Biological
  • Sex Factors
  • Steroids

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