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Issue 9, 2006
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Determination of the origin of urinary norandrosterone traces by gas chromatography combustion isotope ratio mass spectrometry

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Abstract

On the one hand, 19-norandrosterone (NA) is the most abundant metabolite of the synthetic anabolic steroid 19-nortestosterone and related prohormones. On the other hand, small amounts are biosynthesized by pregnant women and further evidence exists for physiological origin of this compound. The World Anti-Doping Agency (WADA) formerly introduced threshold concentrations of 2 or 5 ng of NA per ml of urine to discriminate 19-nortestosterone abuse from biosynthetic origin. Recent findings showed however, that formation of NA resulting in concentrations in the range of the threshold levels might be due to demethylation of androsterone in urine, and the WADA 2006 Prohibited List has defined NA as endogenous steroid. To elucidate the endogenous or exogenous origin of NA, 13C/12C-analysis is the method of choice since synthetic 19-nortestosterone is derived from C3-plants by partial synthesis and shows δ13CVPDB-values of around −28‰. Endogenous steroids are less depleted in 13C due to a dietary mixture of C3- and C4-plants. An extensive cleanup based on two high performance liquid chromatography cleanup steps was applied to quality control and doping control samples, which contained NA in concentrations down to 2 ng per ml of urine. 13C/12C-ratios of NA, androsterone and etiocholanolone were measured by gas chromatography/combustion/isotope ratio mass spectrometry. By comparing δ13CVPDB-values of androsterone as endogenous reference compound with NA, the origin of NA in doping control samples was determined as either endogenous or exogenous.

Graphical abstract: Determination of the origin of urinary norandrosterone traces by gas chromatography combustion isotope ratio mass spectrometry

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Publication details

The article was received on 16 Mar 2006, accepted on 04 Jul 2006 and first published on 28 Jul 2006


Article type: Paper
DOI: 10.1039/B603668F
Analyst, 2006,131, 1021-1026

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    Determination of the origin of urinary norandrosterone traces by gas chromatography combustion isotope ratio mass spectrometry

    M. Hebestreit, U. Flenker, G. Fußhöller, H. Geyer, U. Güntner, U. Mareck, T. Piper, M. Thevis, C. Ayotte and W. Schänzer, Analyst, 2006, 131, 1021
    DOI: 10.1039/B603668F

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