Development of mass spectrometry-based methods for the detection of 11-ketotestosterone and 11-ketodihydrotestosterone

von Piper, Thomas (Autor), ... Thevis, Mario (Autor)
Erschienen in Drug testing and analysis, 15 (2023), 5, S. 566-578, Lit.

Investigations in carbon isotope ratios of seized testosterone and boldenone preparations

von Piper, Thomas (Autor), ... Thevis, Mario (Autor)
Erschienen in Drug testing and analysis, 14 (2022), 3 (Addressing the challenges in forensic drug chemistry II), S. 514-518, Lit.

Anabolic agents

von Piper, Thomas (Autor), ... Thevis, Mario (Autor)
Erschienen in Karch's drug abuse handbook, Boca Raton (Flor.): Routledge (Verlag), CRC Press (Verlag), 2022, S. 370-381, Lit.

A brief summary of different isotope ratio mass spectrometry-based approaches to detect low-dose testosterone applications

von 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. 30-34, Lit.

Addressing recent challenges in isotope ratio mass spectrometry: development of a method applicable to1-androstene-steroids, 6α-hydroxy-androstenedione, andandrostatrienedione

von Piper, Thomas (Autor), ... Thevis, Mario (Autor)
Erschienen in Drug testing and analysis, 14 (2022), 11-12, S. 1891–1903, Lit.

Investigations into the human metabolism of ecdysterone

von Piper, Thomas (Autor), ... Thevis, Mario (Autor)
Erschienen in Drug testing and analysis, 15 (2023), 11/12 (The 41st Manfred Donike Workshop on Doping Analysis), S. 1503-1520, Lit.

Highly sensitive low resolution GCxGC-TOF as a complement in doping control analysis of anabolic androgenic steroids

von Piper, Thomas (Autor), ... Panto, S. (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. 50-54, Lit.

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.

Recent advances in identifying and utilizing metabolites of selected doping agents in human sports drug testing

von Thevis, Mario (Autor), ... Piper, Thomas (Autor), Thomas, Andreas (Autor)
Erschienen in Journal of pharmaceutical and biomedical analysis, 2021, 205, Art.-ID 114312, [o.A.], 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.

Identification of trenbolone metabolites using hydrogen isotope ratio mass spectrometry and liquid chromatography/high accuracy/high resolution mass spectrometry for doping control...

von Putz, Marlen Svenja (Autor), ... Piper, Thomas (Autor), Thevis, Mario (Autor)
Erschienen in Frontiers in Chemistry, 8 (2020), Art.-ID 435; [15 S.], 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.

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.

AICAr to SAICAr ratio can serve as additional marker of AICAr use

von Sobolevsky, Tim (Autor), ... Piper, Thomas (Autor), Ahrens, Brian (Autor), Thevis, Mario (Autor)
Erschienen in Drug testing and analysis, 14 (2022), 11-12, S. 2017-2025, Lit.

An in vitro assay approach to investigate the potential impact of different doping agents on the steroid profile

von Piper, Thomas (Autor), ... Heimbach, Sonja (Autor), Adamczewski, Martin (Autor), Thevis, Mario (Autor)
Erschienen in Drug testing and analysis, 13 (2021), 5 (Non‐targeted screening of drugs), S. 916-928, Lit.

Investigations on hydrogen isotope ratios of endogenous urinary steroids : reference-population-based thresholds and proof-of-concept

von Piper, Thomas (Autor), ... Thomas, Andreas (Autor), Thevis, Mario (Autor), Saugy, Martial (Autor)
Erschienen in Drug testing and analysis, 4 (2012), 9-10 (30th Cologne Workshop: Advances in sports drug testing), S. 717-727, 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.

Carbon isotope ratios of endogenous steroids in Belgian Blue and Holstein cattle : method development, reference population studies and application to steroid misuse control

von Piper, Thomas (Autor), ... Putz, Marlen Svenja (Autor), Delahaut, Philippe (Autor), Thevis, Mario (Autor)
Erschienen in Rapid communications in mass spectrometry, 31 (2017), 21, S. 1793-1802, Lit.