Untersuchungen zum 13C/12C- und 2H/1H-Verhältnis endogener urinärer Steroide

von Piper, Thomas (Autor) ... Köln: 2009, IV, 128 S., 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.

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.

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.

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.

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.

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.

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.

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.

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.

Improved sample preparation and subsequent investigations on population based thresholds for carbon isotope ratios of urinary steroids

von Piper, Thomas (Autor), ... Emery, Caroline (Autor), Saugy, Martial (Autor)
Erschienen in Recent advances in doping analysis (20) : Proceedings of the Manfred-Donike-Workshop ; 30th Cologne Workshop on Dope Analysis ; 26th February to 2nd March 2012 2. Variante, Köln: Sportverl. Strauß (Verlag), 2012, S. 209-212, Lit.

Norandrosterone analysis by GC/C/IRMS

von Piper, Thomas (Autor), ... Emery, Caroline (Autor), Saugy, Martial (Autor)
Erschienen in Recent advances in doping analysis (20) : Proceedings of the Manfred-Donike-Workshop ; 30th Cologne Workshop on Dope Analysis ; 26th February to 2nd March 2012 2. Variante, Köln: Sportverl. Strauß (Verlag), 2012, S. 201-204, 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.

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.

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.