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.

Carbon isotope ratios of endogenous steroids found in human serum : method development, validation, and reference population-derived thresholds

von Piper, Thomas (Autor), ... Geyer, Hans (Autor), Nieschlag, Eberhard (Autor), Thevis, Mario (Autor)
Erschienen in Recent advances in doping analysis (29) : Proceedings of the Manfred Donike Workshop ; 39th Cologne Workshop on Dope Analysis 22nd to 26th March 2021, Hellenthal: Sportverl. Strauß (Verlag), 2021, S. 185-186, Lit.

Carbon isotope ratios of endogenous steroids found in human serum : method development, validation, and reference population-derived thresholds

von Piper, Thomas (Autor), ... Geyer, Hans (Autor), Nieschlag, Eberhard (Autor), Bally, Lia (Autor), Thevis, Mario (Autor)
Erschienen in Analytical and bioanalytical chemistry, 413 (2021), 22 (Recent Trends in (Bio)Analytical Chemistry), S. 5655-5667, Lit.

Black market products suspected to contain doping relevant ingredients - report for 2021

von Krug, Oliver (Autor), ... Geyer, Hans (Autor), Thomas, Andreas (Autor), Piper, Thomas (Autor), Thevis, Mario (Autor)
Erschienen in Recent advances in doping analysis (30) : Proceedings of the Manfred Donike Workshop ; 40th Cologne workshop on dope analysis ; 28th March to 1st April 2022, Hellenthal: Sportverl. Strauß (Verlag), 2022, S. 157-161, Lit.

Sensitive detection of testosterone and testosterone prohormone administrations based on urinary concentrations and carbon isotope ratios of androsterone and etiocholanolone

von Piper, Thomas (Autor), ... Haenelt, Nadine (Autor), Fußhöller, Gregor (Autor), Geyer, Hans (Autor), Thevis, Mario (Autor)
Erschienen in Recent advances in doping analysis (29) : Proceedings of the Manfred Donike Workshop ; 39th Cologne Workshop on Dope Analysis 22nd to 26th March 2021, Hellenthal: Sportverl. Strauß (Verlag), 2021, S. 187-188, 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.

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.

Sensitive detection of testosterone and testosterone prohormone administrations based on urinary concentrations and carbon isotope ratios of androsterone and etiocholanolone

von Piper, Thomas (Autor), ... Haenelt, Nadine (Autor), Fußhöller, Gregor (Autor), Geyer, Hans (Autor), Thevis, Mario (Autor)
Erschienen in Drug testing and analysis, 13 (2021), 11/12 (The 39th Manfred Donike workshop on doping analysis), S. 1835-1851, Lit.

Evaluation of doping control samples to determine the prevalence of nicotine use by German elite athletes

von Rubio Alaejos, Ana (Autor), ... Sigmund, Gerd (Autor), Piper, Thomas (Autor), Geyer, Hans (Autor), Thevis, Mario (Autor)
Erschienen in Recent advances in doping analysis (29) : Proceedings of the Manfred Donike Workshop ; 39th Cologne Workshop on Dope Analysis 22nd to 26th March 2021, Hellenthal: Sportverl. Strauß (Verlag), 2021, S. 167-170, Lit.

Recent findings on 7-oxo-DHEA and its improved detection based on reference population-derived thresholds for 7β-OH-DHEA and 5αandrostane-3β,7β-diol-17-one

von Piper, Thomas (Autor), ... Geyer, Hans (Autor), Toboc, Ani (Autor), Ahrens, Brian (Autor), Pohanka, Anton (Autor), Thevis, Mario (Autor)
Erschienen in Recent advances in doping analysis (29) : Proceedings of the Manfred Donike Workshop ; 39th Cologne Workshop on Dope Analysis 22nd to 26th March 2021, Hellenthal: Sportverl. Strauß (Verlag), 2021, S. 45-49, Lit.

Black market products suspected to contain doping relevant ingredients - report for 2019-2020

von Krug, Oliver (Autor), ... Geyer, Hans (Autor), Thomas, Andreas (Autor), Walpurgis, Katja (Autor), Piper, Thomas (Autor), Thevis, Mario (Autor)
Erschienen in Recent advances in doping analysis (29) : Proceedings of the Manfred Donike Workshop ; 39th Cologne Workshop on Dope Analysis 22nd to 26th March 2021, Hellenthal: Sportverl. Strauß (Verlag), 2021, S. 122-127, 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.

Current insights into the steroidal module of the athlete biological passport

von Piper, Thomas (Autor), ... Geyer, Hans (Autor), Haenelt, Nadine (Autor), Huelsemann, Frank (Autor), Schänzer, Wilhelm (Autor), Thevis, Mario (Autor)
Erschienen in International journal of sports medicine, 42 (2021), 10, S. 863-878, Lit.

Detecting the misuse of 7-oxo-DHEA by means of carbon isotope ratio mass spectrometry in doping control analysis

von Piper, Thomas (Autor), ... Fußhöller, Gregor (Autor), Geyer, Hans (Autor), Toboc, Ani (Autor), Mădălin-George, Dănilă (Autor), Thevis, Mario (Autor)
Erschienen in Rapid communications in mass spectrometry, 34 (2020), 12, Art.-ID e8776, [14 S.], Lit.

Xenon elimination kinetics following brief exposure

von Schaefer, Maximilian S. (Autor), ... Piper, Thomas (Autor), Geyer, Hans (Autor), Schneemann, Julia (Autor), Neukirchen, Martin (Autor), Thevis, Mario (Autor), Kienbaum, Peter (Autor)
Erschienen in Drug testing and analysis, 9 (2017), 5/6, S. 666-670, Lit.

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

von Piper, Thomas (Autor), ... Mareck, Ute (Autor), Geyer, Hans (Autor), Flenker, Ulrich (Autor), Thevis, Mario (Autor), Platen, Petra (Autor), Schänzer, Wilhelm (Autor)
Erschienen in Rapid communications in mass spectrometry, 22 (2008), 14, S. 2161-2175, Lit.

Reporting and managing elevated testosterone/epitestosterone ratios : novel aspects after five years' experience

von Mareck, Ute (Autor), ... Geyer, Hans (Autor), Fußhöller, Gregor (Autor), Schwenke, Anne (Autor), Haenelt, Nadine (Autor), Piper, Thomas (Autor), Thevis, Mario (Autor), Schänzer, Wilhelm (Autor)
Erschienen in Drug testing and analysis, 2 (2010), 11/12, S. 637-642, Lit.

Determination of 13C/12C ratios of urinary epitestosterone and its main metabolites 5- and 5-androstane-3, 17-diol

von Piper, Thomas (Autor), ... Riemann, Phillip (Autor), Opfermann, Georg (Autor), Mareck, Ute (Autor), Geyer, Hans (Autor), Vâjialã, Graziela (Autor), Flenker, Ulrich (Autor), Schänzer, Wilhelm (Autor)
Erschienen in Drug testing and analysis, 1 (2009), 11/12, S. 576-586, Lit.

Mass spectrometric analysis of black market products by HPLC-(HR)MS, GC-(HR)MS and 1D-gel electrophoresis-UPLC-MSn

von Krug, Oliver (Autor), ... Thomas, Andreas (Autor), Walpurgis, Katja (Autor), Piper, Thomas (Autor), Sigmund, Gerd (Autor), Geyer, Hans (Autor), Schänzer, Wilhelm (Autor), Thevis, Mario (Autor)
Erschienen in Recent advances in doping analysis (21) : Proceedings of the Manfred-Donike-Workshop ; 31th Cologne Workshop on Dope Analysis ; 24th February to 1st March 2013, Köln: Sportverl. Strauß (Verlag), 2013, S. 169-172, Lit.

Mass spectrometric characterization of the selective androgen receptor modulator (SARM) YK-11 for doping control purposes

von Thevis, Mario (Autor), ... Piper, Thomas (Autor), Dib, Josef (Autor), Lagojda, Andreas (Autor), Kühne, Dirk (Autor), Packschies, Lars (Autor), Geyer, Hans (Autor), Schänzer, Wilhelm (Autor)
Erschienen in Rapid communications in mass spectrometry, 31 (2017), 14, S. 1175-1183, Lit.