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High speed determination of beta-receptor blocking agents in human urine by liquid chromatography/tandem mass spectrometry.
Thevis M, Opfermann G, Schänzer W. Thevis M, et al. Among authors: opfermann g. Biomed Chromatogr. 2001 Oct;15(6):393-402. doi: 10.1002/bmc.87. Biomed Chromatogr. 2001. PMID: 11559924
Analytical methods for the detection of clenbuterol.
Parr MK, Opfermann G, Schänzer W. Parr MK, et al. Among authors: opfermann g. Bioanalysis. 2009 May;1(2):437-50. doi: 10.4155/bio.09.29. Bioanalysis. 2009. PMID: 21083176 Review.
Determination of 13C/12C ratios of urinary epitestosterone and its main metabolites 5alpha- and 5beta-androstane-3alpha, 17alpha-diol.
Piper T, Riemann P, Opfermann G, Mareck U, Geyer H, Vajiala G, Flenker U, Schänzer W. Piper T, et al. Among authors: opfermann g. Drug Test Anal. 2009 Nov;1(11-12):576-86. doi: 10.1002/dta.53. Drug Test Anal. 2009. PMID: 20355174
Determination of (13)C/(12)C ratios of endogenous urinary steroids excreted as sulpho conjugates.
Piper T, Opfermann G, Thevis M, Schänzer W. Piper T, et al. Among authors: opfermann g. Rapid Commun Mass Spectrom. 2010 Nov 15;24(21):3171-81. doi: 10.1002/rcm.4762. Rapid Commun Mass Spectrom. 2010. PMID: 20941765
Complementing the characterization of in vivo generated N-glucuronic acid conjugates of stanozolol by collision cross section computation and analysis.
Thevis M, Dib J, Thomas A, Höppner S, Lagojda A, Kuehne D, Sander M, Opfermann G, Schänzer W. Thevis M, et al. Among authors: opfermann g. Drug Test Anal. 2015 Nov-Dec;7(11-12):1050-6. doi: 10.1002/dta.1907. Epub 2015 Oct 30. Drug Test Anal. 2015. PMID: 26514814
Detection of Δ6-methyltestosterone in a "dietary supplement" and GC-MS/MS investigations on its urinary metabolism.
Parr MK, Fusshöller G, Schlörer N, Opfermann G, Geyer H, Rodchenkov G, Schänzer W. Parr MK, et al. Among authors: opfermann g. Toxicol Lett. 2011 Mar 5;201(2):101-4. doi: 10.1016/j.toxlet.2010.11.018. Epub 2010 Dec 4. Toxicol Lett. 2011. PMID: 21134425
Metabolism of androsta-1,4,6-triene-3,17-dione and detection by gas chromatography/mass spectrometry in doping control.
Parr MK, Fusshöller G, Schlörer N, Opfermann G, Piper T, Rodchenkov G, Schänzer W. Parr MK, et al. Among authors: opfermann g. Rapid Commun Mass Spectrom. 2009 Jan;23(2):207-18. doi: 10.1002/rcm.3861. Rapid Commun Mass Spectrom. 2009. PMID: 19089863
Identification of steroid isoxazole isomers marketed as designer supplement.
Parr MK, Gütschow M, Daniels J, Opfermann G, Thevis M, Schänzer W. Parr MK, et al. Among authors: opfermann g. Steroids. 2009 Mar;74(3):322-8. doi: 10.1016/j.steroids.2008.11.006. Epub 2008 Nov 17. Steroids. 2009. PMID: 19061909
Factors influencing the steroid profile in doping control analysis.
Mareck U, Geyer H, Opfermann G, Thevis M, Schänzer W. Mareck U, et al. Among authors: opfermann g. J Mass Spectrom. 2008 Jul;43(7):877-91. doi: 10.1002/jms.1457. J Mass Spectrom. 2008. PMID: 18570179 Review.
6alpha-Methylandrostenedione: gas chromatographic mass spectrometric detection in doping control.
Parr MK, Kazlauskas R, Schlörer N, Opfermann G, Piper T, Schulze G, Schänzer W. Parr MK, et al. Among authors: opfermann g. Rapid Commun Mass Spectrom. 2008;22(3):321-9. doi: 10.1002/rcm.3367. Rapid Commun Mass Spectrom. 2008. PMID: 18181236
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