13C/12C-Analysis of urinary epitestosterone

von Schänzer, Wilhelm (Leiter) ...
Deutsche Sporthochschule Köln / Institut für Biochemie
Projektlaufzeit: 12/2007-12/2008

Revisiting the metabolism of 19-nortestosterone using isotope ratio and high resolution/high accuracy mass spectrometry

von Piper, Thomas (Autor), ... Schänzer, Wilhelm (Autor), Thevis, Mario (Autor)
Erschienen in The journal of steroid biochemistry and molecular biology, 162 (2016), S. 80-91, Lit.

Degradation of urine samples and its influence on the 13C/12C ratios of excreted steroids

von Piper, Thomas (Autor), ... Geyer, Hans (Autor), Schänzer, Wilhelm (Autor)
Erschienen in Drug testing and analysis, 2 (2010), 11/12, S. 620-629, Lit.

Determination of 13C/12C ratios of endogenous urinary steroids : method validation, reference population and implication for doping control purposes

von Flenker, Ulrich (Autor), ... Schänzer, Wilhelm (Autor), Piper, Thomas (Autor)
Erschienen in Recent advances in doping analysis (16) : Proceedings of the Manfred Donike Workshop ; 26th Cologne Workshop on Dope Analysis ; 24th to 29th February 2008, Köln: Sportverl. Strauß (Verlag), 2008, S. 151, Lit.

Investigations on the deconjugation processes of conjugated urinary steroids during degradation with 18O labelled water

von Piper, Thomas (Autor), ... Fußhöller, Gregor (Autor), Schänzer, Wilhelm (Autor)
Erschienen in Recent advances in doping analysis (19) : Proceedings of the Manfred-Donike-Workshop ; 29th Cologne Workshop on Dope Analysis ; 13th to 18th February 2011, Köln: Sportverl. Strauß (Verlag), 2011, S. 296-299, Lit.

Determination of 13C/12C ratios of endogenous urinary steroids excreted as sulphates : method validation and reference population

von Piper, Thomas (Autor), ... Flenker, Ulrich (Autor), Schänzer, Wilhelm (Autor)
Erschienen in Recent advances in doping analysis (17) : Proceedings of the Manfred Donike Workshop ; 27th Cologne Workshop on Dope Analysis ; 1st to 6th March 2009, Köln: Sportverl. Strauß (Verlag), 2009, S. 237-240, Lit.

Genotype-dependent metabolism of exogenous testosterone : new biomarkers result in prolonged detectability

von Piper, Thomas (Autor), ... Schänzer, Wilhelm (Autor), Thevis, Mario (Autor)
Erschienen in Drug testing and analysis, 8 (2016), 11/12 (34th Cologne workshop: Advances in sports drug testing), S. 1163-1173, Lit.

13C/12C Ratios of endogenous urinary steroids investigated for doping control purposes

von Piper, Thomas (Autor), ... Flenker, Ulrich (Autor), Mareck, Ute (Autor), Schänzer, Wilhelm (Autor)
Erschienen in Drug testing and analysis, 1 (2009), 2, S. 65-72, Lit.

Investigations on changes in 13C/12C ratios of endogenous urinary steroids after pregnenolone administration

von Piper, Thomas (Autor), ... Schlug, Christoph (Autor), Mareck, Ute (Autor), Schänzer, Wilhelm (Autor)
Erschienen in Drug testing and analysis, 3 (2011), 5, S. 283-290, Lit.

Determination of 13C/12C ratios of endogenous urinary steroids excreted as sulpho conjugates

von Piper, Thomas (Autor), ... Opfermann, Georg (Autor), Thevis, Mario (Autor), Schänzer, Wilhelm (Autor)
Erschienen in Rapid communications in mass spectrometry, 24 (2010), 21, S. 3171-3181, Lit.

Investigations on the in vivo metabolism of 5α-androst-2-en-17-one

von Piper, Thomas (Autor), ... Fußhöller, Gregor (Autor), Schänzer, Wilhelm (Autor), Thevis, Mario (Autor)
Erschienen in Rapid communications in mass spectrometry, 36 (2022), 17, Art.-ID e9343, [14 S.], Lit.

A new, effective and robust method to couple gas chromatography and isotope ratio mass spectrometry

von Flenker, Ulrich (Autor), ... Hebestreit, Moritz (Autor), Piper, Thomas (Autor), Schänzer, Wilhelm (Autor)
Erschienen in Recent advances in doping analysis (14) : Proceedings of the Manfred Donike Workshop ; 24th Cologne Workshop on Dope Analysis ; 4th to 9th June 2006, Köln: Sportverl. Strauß (Verlag), 2006, S. 299-306, Lit.

Aspekte der modernen Dopinganalytik

von Thomas, Andreas (Autor), ... Piper, Thomas (Autor), Schänzer, Wilhelm (Autor), Thevis, Mario (Autor)
Erschienen in Pharmakon, 4 (2016), 1 (Doping), S. 17-21, Lit.

Determination of the deuterium/hydrogen ratio of endogenous urinary steroids for doping control purposes

von Piper, Thomas (Autor), ... Thevis, Mario (Autor), Flenker, Ulrich (Autor), Schänzer, Wilhelm (Autor)
Erschienen in Rapid communications in mass spectrometry, 23 (2009), 13, S. 1917-1926, Lit.

Determination of 13C/12C ratios of urinary excreted boldenone and its main metabolite 5beta-androst-1-en-17beta-ol-3-one

von Piper, Thomas (Autor), ... Geyer, Hans (Autor), Gougoulidis, Vassilios (Autor), Flenker, Ulrich (Autor), Schänzer, Wilhelm (Autor)
Erschienen in Drug testing and analysis, 2 (2010), 5, S. 217–224, Lit.

Hydrogen isotope ratio mass spectrometry and high-resolution/high-accuracy mass spectrometry in metabolite identification studies : detecting target compounds for sports drug testi...

von Thevis, Mario (Autor), ... Piper, Thomas (Autor), Horning, Stevan (Autor), Juchelka, Dieter (Autor), Schänzer, Wilhelm (Autor)
Erschienen in Rapid communications in mass spectrometry, 27 (2013), 17, S. 1904-1912, Lit.

Expanding sports drug testing assays : mass spectrometric characterization of the selective androgen receptor modulator drug candidates RAD140 and ACP‐105

von Thevis, Mario (Autor), ... Piper, Thomas (Autor), Beuck, Simon (Autor), Geyer, Hans (Autor), Schänzer, Wilhelm (Autor)
Erschienen in Rapid communications in mass spectrometry, 27 (2013), 11, S. 1173-1182, Lit.

Investigations on carbon isotope ratios and concentrations of urinary formestane

von Piper, Thomas (Autor), ... Fußhöller, Gregor (Autor), Emery, Caroline (Autor), Schänzer, Wilhelm (Autor), Saugy, Martial (Autor)
Erschienen in Drug testing and analysis, 4 (2012), 12 (Stable isotope ratio analysis in sports anti-doping), S. 942-950, Lit.

Improved performance and maintenance in gas chromatography/isotope ratio mass spectrometry by precolumn solvent removal

von Flenker, Ulrich (Autor), ... Hebestreit, Moritz (Autor), Piper, Thomas (Autor), Hülsemann, Frank (Autor), Schänzer, Wilhelm (Autor)
Erschienen in Analytical chemistry, 79 (2007), 11, S. 4162-4168, Lit.

Detection of dehydroepiandrosterone misuse by means of gas chromatography-combustion-isotope ratio mass spectrometry

von Mareck, Ute (Autor), ... Geyer, Hans (Autor), Flenker, Ulrich (Autor), Piper, Thomas (Autor), Thevis, Mario (Autor), Schänzer, Wilhelm (Autor)
Erschienen in European journal of mass spectrometry, 13 (2007), 6, S. 419-426, Lit.