Clenbuterol marketed as dietary supplement

von Parr, Maria Kristina (Autor), ... Köhler, Karsten (Autor), Geyer, Hans (Autor), Guddat, Sven (Autor), Schänzer, Wilhelm (Autor)
Erschienen in Biomedical chromatography, 22 (2008), 3, S. 298-300, Lit.

The matrix problem in calibration of the GC/MS for endogenous steroids : the search for an artificial urine

von Geyer, Hans (Autor), ... Mareck-Engelke, U. (Autor), Nolteernsting, E. (Autor), Opfermann, G. (Autor), Donike, M. (Autor)
Erschienen in Recent advances in doping analysis (2) : Proceedings of the 12th Cologne Workshop on Dope Analysis ; 10th to 15th April 1994, Köln: Sport u. Buch Strauß (Verlag), 1995, S. 199-209, Lit.

Standardisation of the T/E-determination by deuterated internal standards

von Nolteernsting, E. (Autor), ... Geyer, Hans (Autor), Mareck-Engelke, U. (Autor), Schänzer, Wilhelm (Autor), Donike, M. (Autor)
Erschienen in Recent advances in doping analysis (2) : Proceedings of the 12th Cologne Workshop on Dope Analysis ; 10th to 15th April 1994, Köln: Sport u. Buch Strauß (Verlag), 1995, S. 113-120, Lit.

Screening for Tamoxifen, Clomiphene and Cyclofenil in doping analysis

von Mareck-Engelke, U. (Autor), ... Sigmund, G. (Autor), Opfermann, G. (Autor), Geyer, Hans (Autor), Schänzer, Wilhelm (Autor)
Erschienen in Recent advances in doping analysis (9) : Proceedings of the Manfred Donike Workshop ; 19th Cologne Workshop on dope analysis ; 18th to 23rd March 2001, Köln: Sport u. Buch Strauß (Verlag), 2001, S. 53-61, Lit.

Feasibility study on commercially available THC drug screen test devices

von Mareck, Ute (Autor), ... Kress, A. (Autor), Schwarz, U.W. (Autor), Geyer, Hans (Autor), Schänzer, Wilhelm (Autor)
Erschienen in Recent advances in doping analysis (11) : Proceedings of the Manfred Donike Workshop ; 21st Cologne Workshop on Dope Analysis ; 16th to 21st March 2003, Köln: Sport u. Buch Strauß (Verlag), 2003, S. 109-118, Lit.

Screening of nutritional supplements for stimulants and other drugs

von Parr, Maria Kristina (Autor), ... Geyer, Hans (Autor), Sigmund, Gerd (Autor), Köhler, Karsten (Autor), Schänzer, Wilhelm (Autor)
Erschienen in Recent advances in doping analysis (11) : Proceedings of the Manfred Donike Workshop ; 21st Cologne Workshop on Dope Analysis ; 16th to 21st March 2003, Köln: Sport u. Buch Strauß (Verlag), 2003, S. 67-75, Lit.

Serum testosterone and urinary steroid profiles after administration of a zinc supplement

von Koehler, K. (Autor), ... Parr, M.K. (Autor), Geyer, Hans (Autor), Bode, C. (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. 419-422, Lit.

Some good news from the field of nutritional supplements

von Geyer, Hans (Autor), ... Gülker, Andrea (Autor), Mareck, U. (Autor), Parr, M.K. (Autor), Schänzer, Wilhelm (Autor)
Erschienen in Recent advances in doping analysis (12) : Proceedings of the Manfred Donike Workshop ; 22th Cologne Workshop on Dope Analysis ; 7th to 12th March 2004, Köln: Sport u. Buch Strauß (Verlag), 2004, S. 91-97, Lit.

Population based reference ranges and additional screening marker for the improvement of the detection of dehydroepiandrosterone misuse

von Mareck, U. (Autor), ... Geyer, Hans (Autor), Flenker, U. (Autor), Thevis, Mario (Autor), Schänzer, Wilhelm (Autor), Piper, T. (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. 149-150, Lit.

Long-term detection of clenbuterol in human scalp hair by means of gaschromatography/high resolution mass spectrometry (GC/HRMS)

von Machnik, M. (Autor), ... Geyer, Hans (Autor), Horning, S. (Autor), Delahaut, P. (Autor), Breidbach, A. (Autor), Schänzer, Wilhelm (Autor)
Erschienen in Recent advances in doping analysis (6) : Proceedings of the Manfred Donike Workshop ; 16th Cologne Workshop on Dope Analysis ; 15th to 20th March 1998, Köln: Sport u. Buch Strauß (Verlag), 1999, S. 31-35, Lit.

Detection of exogenous testosterone by 13C/12C analysis

von Horning, S. (Autor), ... Geyer, Hans (Autor), Machnik, M. (Autor), Schänzer, Wilhelm (Autor), Hilkert, A. (Autor), Oeßelmann, J. (Autor)
Erschienen in Recent advances in doping analysis (4) : Proceedings of the Manfred Donike Workshop ; 14th Cologne Workshop on Dope Analysis ; 17th to 22nd March 1996, Köln: Sport u. Buch Strauß (Verlag), 1997, S. 275-283, Lit.

Untersuchung und Beurteilung eines neuen Drogenscreening Test-Sticks zur Prävention von Cannabismissbrauch im Sport

von Mareck, U. (Autor), ... Kress, A. (Autor), Schwarz, U.W. (Autor), Geyer, Hans (Autor), Schänzer, Wilhelm (Autor)
Erschienen in Deutsche Zeitschrift für Sportmedizin, 55 (2004), 2, S. 48-50, Lit.

Positive Dopingfälle mit Norandrosteron durch verunreinigte Nahrungsergänzungsmittel

von Geyer, Hans (Autor), ... Mareck-Engelke, U. (Autor), Reinhart, U. (Autor), Thevis, Mario (Autor), Schänzer, Wilhelm (Autor)
Erschienen in Deutsche Zeitschrift für Sportmedizin, 51 (2000), 11, S. 378-382, Lit.

Identification of the aromatase inhibitor letrozole in urine by gas chromatography/mass spectrometry

von Mareck, Ute (Autor), ... Sigmund, Gerd (Autor), Opfermann, Georg (Autor), Geyer, Hans (Autor), Thevis, Mario (Autor), Schänzer, Wilhelm (Autor)
Erschienen in Rapid communications in mass spectrometry, 19 (2005), 24, S. 3689-3693, 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.

Investigations into the concentration and metabolite profiles of stanozolol and LGD-4033 in blood plasma and seminal fluid using liquid chromatography high-resolution mass spectrom...

von Breuer, Johanna (Autor), ... Thomas, Andreas (Autor), Delahaut, Philippe (Autor), Schänzer, Wilhelm (Autor), Geyer, Hans (Autor), Thevis, Mario (Autor)
Erschienen in Analytical and bioanalytical chemistry, 415 (2023), 4, S. 669–681, Lit.

Mass spectrometric characterization of urinary metabolites of the selective androgen receptor modulator andarine (S-4) for routine doping control purposes

von Thevis, Mario (Autor), ... Thomas, A. (Autor), Fußhöller, Gregor (Autor), Beuck, Simon (Autor), Geyer, Hans (Autor), Schänzer, Wilhelm (Autor)
Erschienen in Rapid communications in mass spectrometry, 24 (2010), 15, S. 2245-2254, 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.

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.

Mass spectrometric detection of peginesatide in human urine in doping control analysis

von Möller, Ines (Autor), ... Thomas, Andreas (Autor), Delahaut, Philippe (Autor), Geyer, Hans (Autor), Schänzer, Wilhelm (Autor), Thevis, Mario (Autor)
Erschienen in Journal of pharmaceutical and biomedical analysis, 70 (2012), S. 512-517, Lit.