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Hydrogen isotope ratio mass spectrometry and high-resolution/high-accuracy mass spectrometry in metabolite identification studies: detecting target compounds for sports drug testing.
Thevis M, Piper T, Horning S, Juchelka D, Schänzer W. Thevis M, et al. Among authors: piper t. Rapid Commun Mass Spectrom. 2013 Sep 15;27(17):1904-12. doi: 10.1002/rcm.6648. Rapid Commun Mass Spectrom. 2013. PMID: 23939956
Determination of the origin of urinary norandrosterone traces by gas chromatography combustion isotope ratio mass spectrometry.
Hebestreit M, Flenker U, Fusshöller G, Geyer H, Güntner U, Mareck U, Piper T, Thevis M, Ayotte C, Schänzer W. Hebestreit M, et al. Among authors: piper t. Analyst. 2006 Sep;131(9):1021-6. doi: 10.1039/b603668f. Epub 2006 Jul 28. Analyst. 2006. PMID: 17047802
Improved performance and maintenance in gas chromatography/isotope ratio mass spectrometry by precolumn solvent removal.
Flenker U, Hebestreit M, Piper T, Hülsemann F, Schänzer W. Flenker U, et al. Among authors: piper t. Anal Chem. 2007 Jun 1;79(11):4162-8. doi: 10.1021/ac0621468. Epub 2007 May 4. Anal Chem. 2007. PMID: 17477501
6alpha-Methylandrostenedione: gas chromatographic mass spectrometric detection in doping control.
Parr MK, Kazlauskas R, Schlörer N, Opfermann G, Piper T, Schulze G, Schänzer W. Parr MK, et al. Among authors: piper t. Rapid Commun Mass Spectrom. 2008;22(3):321-9. doi: 10.1002/rcm.3367. Rapid Commun Mass Spectrom. 2008. PMID: 18181236
Detection of dehydroepiandrosterone misuse by means of gas chromatography- combustion-isotope ratio mass spectrometry.
Mareck U, Geyer H, Flenker U, Piper T, Thevis M, Schänzer W. Mareck U, et al. Among authors: piper t. Eur J Mass Spectrom (Chichester). 2007;13(6):419-26. doi: 10.1255/ejms.900. Eur J Mass Spectrom (Chichester). 2007. PMID: 18417762
Determination of 13C/12C ratios of endogenous urinary steroids: method validation, reference population and application to doping control purposes.
Piper T, Mareck U, Geyer H, Flenker U, Thevis M, Platen P, Schänzer W. Piper T, et al. Rapid Commun Mass Spectrom. 2008 Jul;22(14):2161-75. doi: 10.1002/rcm.3601. Rapid Commun Mass Spectrom. 2008. PMID: 18536069
Metabolism of androsta-1,4,6-triene-3,17-dione and detection by gas chromatography/mass spectrometry in doping control.
Parr MK, Fusshöller G, Schlörer N, Opfermann G, Piper T, Rodchenkov G, Schänzer W. Parr MK, et al. Among authors: piper t. Rapid Commun Mass Spectrom. 2009 Jan;23(2):207-18. doi: 10.1002/rcm.3861. Rapid Commun Mass Spectrom. 2009. PMID: 19089863
Determination of the deuterium/hydrogen ratio of endogenous urinary steroids for doping control purposes.
Piper T, Thevis M, Flenker U, Schänzer W. Piper T, et al. Rapid Commun Mass Spectrom. 2009 Jul;23(13):1917-26. doi: 10.1002/rcm.4098. Rapid Commun Mass Spectrom. 2009. PMID: 19462405
Determination of 13C/12C ratios of urinary epitestosterone and its main metabolites 5alpha- and 5beta-androstane-3alpha, 17alpha-diol.
Piper T, Riemann P, Opfermann G, Mareck U, Geyer H, Vajiala G, Flenker U, Schänzer W. Piper T, et al. Drug Test Anal. 2009 Nov;1(11-12):576-86. doi: 10.1002/dta.53. Drug Test Anal. 2009. PMID: 20355174
13C/12C ratios of endogenous urinary steroids investigated for doping control purposes.
Piper T, Flenker U, Mareck U, Schänzer W. Piper T, et al. Drug Test Anal. 2009 Feb;1(2):65-72. doi: 10.1002/dta.15. Drug Test Anal. 2009. PMID: 20355178
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