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 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.

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.

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.

Quantitative analysis of urinary glycerol levels for doping control purposes using gas chromatography-mass spectrometry

von Thevis, Mario (Autor), ... Guddat, Sven (Autor), Flenker, Ulrich (Autor), Schänzer, Wilhelm (Autor)
Erschienen in European journal of mass spectrometry, 14 (2008), 3, S. 117–125, 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.

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.

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.

Doping-control analysis of the 5[alpha]-reductase inhibitor finasteride : determination of its influence on urinary steroid profiles and detection of its major urinary metabolite

von Thevis, Mario (Autor), ... Geyer, Hans (Autor), Mareck, Ute (Autor), Flenker, Ulrich (Autor), Schänzer, Wilhelm (Autor)
Erschienen in Therapeutic drug monitoring, 29 (2007), 2, S. 236-247, 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.

Usefulness of serum androgen isotope ratio mass spectrometry (IRMS) to detect testosterone supplementation in women

von Andersson, Alexander (Autor), ... Piper, Thomas (Autor), Ekström, Lena (Autor), Linden Hirschberg, Angelica (Autor), Thevis, Mario (Autor)
Erschienen in Drug testing and analysis, 15 (2023), 4, S. 465-469, Lit.

Analysis of endogenous steroids in urine by means of multi-immunoaffinity chromatography and isotope ratio mass spectrometry for sports drug testing

von Putz, Marlen Svenja (Autor), ... Piper, Thomas (Autor), Dubois, Michael (Autor), Delahaut, Philippe (Autor), Thevis, Mario (Autor)
Erschienen in Analytical and bioanalytical chemistry, 10 (2019), S. 7563–7571, 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.

Studies on the in vivo metabolism of methylstenbolone and detection of novel long term metabolites for doping control analysis

von Piper, Thomas (Autor), ... Fußhöller, Gregor (Autor), Schänzer, Wilhelm (Autor), Lagojda, Andreas (Autor), Kuehne, Dirk (Autor), Thevis, Mario (Autor)
Erschienen in Drug testing and analysis, 11 (2019), 11/12 (37th Cologne workshop: Advances in sports drug testing), S. 1644-1655, 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.

Comparison of hGH serum concentrations of Caucasian and African top athletes : an ethnicity study

von Kohler, Maxie (Autor), ... Gotzmann, Andrea (Autor), Görgens, Christian (Autor), Flenker, Ulrich (Autor), Thevis, Mario (Autor), Schänzer, Wilhelm (Autor)
Erschienen in Recent advances in doping analysis (18) : Proceedings of the Manfred-Donike-Workshop ; 28th Cologne Workshop on Dope Analysis , 7th to 12th March 2010, Köln: Sportverl. Strauß (Verlag), 2010, S. 196-199, Lit.

Quantification of AICAR-ribotide concentrations in red blood cells by means of LC-MS/MS

von Thomas, Andreas (Autor), ... Vogel, Matthias (Autor), Piper, Thomas (Autor), Krug, Oliver (Autor), Beuck, Simon (Autor), Schänzer, Wilhelm (Autor), Thevis, Mario (Autor)
Erschienen in Analytical and bioanalytical chemistry, 405 (2013), 30, S. 9703-9709, 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.

Development and validation of a multidimensional gas chromatography/combustion/isotope ratio mass spectrometry-based test method for analyzing urinary steroids in doping controls

von Putz, Marlen Svenja (Autor), ... Piper, Thomas (Autor), Casilli, Alessandro (Autor), Radler de Aquino Neto, Francisco (Autor), Pigozzo, Fausto (Autor), Thevis, Mario (Autor)
Erschienen in Analytica chimica acta, 2018, 1030, S. 105-114, Lit.

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

von Hebestreit, Moritz (Autor), ... Flenker, Ulrich (Autor), Fußhöller, Gregor (Autor), Geyer, Hans (Autor), Güntner, Ute (Autor), Mareck, Ute (Autor), Piper, Thomas (Autor), Thevis, Mario (Autor), Ayotte, Christiane (Autor), Schänzer, Wilhelm (Autor)
Erschienen in The Analyst, 131 (2006), 9, S. 1021-1026, Lit.