Publications by authors named "Georg Opfermann"

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Complementing the characterization of in vivo generated N-glucuronic acid conjugates of stanozolol by collision cross section computation and analysis.
Mario Thevis, Josef Dib, Andreas Thomas, Sebastian Höppner, Andreas Lagojda, Georg Opfermann

Drug Test Anal· September 2016

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Expanding analytical possibilities concerning the detection of stanozolol misuse by means of high resolution/high accuracy mass spectrometric detection of stanozolol glucuronides in human sports drug testing.
Wilhelm Schänzer, Sven Guddat, Andreas Thomas, Georg Opfermann, Hans Geyer

Drug Test Anal· August 2014

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Unexpected contribution of cytochrome P450 enzymes CYP11B2 and CYP21, as well as CYP3A4 in xenobiotic androgen elimination - insights from metandienone metabolism.
Maria Kristina Parr, Andy Zöllner, Gregor Fusshöller, Georg Opfermann, Nils Schlörer

Toxicol Lett· September 2012

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Endocrine characterization of the designer steroid methyl-1-testosterone: investigations on tissue-specific anabolic-androgenic potency, side effects, and metabolism.
Maria K Parr, Christina Blatt, Oliver Zierau, Cornelius Hess, Michael Gütschow, Georg Opfermann

Endocrinology· December 2011

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Seized designer supplement named "1-Androsterone": identification as 3β-hydroxy-5α-androst-1-en-17-one and its urinary elimination.
Maria K Parr, Georg Opfermann, Hans Geyer, Folker Westphal, Frank D Sönnichsen

Steroids· May 2011

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Detection of Δ6-methyltestosterone in a "dietary supplement" and GC-MS/MS investigations on its urinary metabolism.
Maria K Parr, Gregor Fusshöller, Nils Schlörer, Georg Opfermann, Hans Geyer

Toxicol Lett· March 2011

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Determination of (13)C/(12)C ratios of endogenous urinary steroids excreted as sulpho conjugates.
Thomas Piper, Georg Opfermann, Mario Thevis, Wilhelm Schänzer

Rapid Commun Mass Spectrom· November 2010

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Determination of 13C/12C ratios of urinary epitestosterone and its main metabolites 5alpha- and 5beta-androstane-3alpha, 17alpha-diol.
Thomas Piper, Phillip Riemann, Georg Opfermann, Ute Mareck, Hans Geyer

Drug Test Anal· November 2009

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Analytical methods for the detection of clenbuterol.
Maria K Parr, Georg Opfermann, Wilhelm Schänzer

Bioanalysis· May 2009

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Identification of steroid isoxazole isomers marketed as designer supplement.
Maria K Parr, Michael Gütschow, Jörg Daniels, Georg Opfermann, Mario Thevis

Steroids· March 2009

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Metabolism of androsta-1,4,6-triene-3,17-dione and detection by gas chromatography/mass spectrometry in doping control.
Maria K Parr, Gregor Fusshöller, Nils Schlörer, Georg Opfermann, Thomas Piper

Rapid Commun Mass Spectrom· January 2009

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Factors influencing the steroid profile in doping control analysis.
Ute Mareck, Hans Geyer, Georg Opfermann, Mario Thevis, Wilhelm Schänzer

J Mass Spectrom· July 2008

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6alpha-Methylandrostenedione: gas chromatographic mass spectrometric detection in doping control.
Maria K Parr, Rymantas Kazlauskas, Nils Schlörer, Georg Opfermann, Thomas Piper

Rapid Commun Mass Spectrom· April 2008

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Identification of the aromatase inhibitors anastrozole and exemestane in human urine using liquid chromatography/tandem mass spectrometry.
Ute Mareck, Hans Geyer, Sven Guddat, Nadine Haenelt, Anja Koch, Georg Opfermann

Rapid Commun Mass Spectrom· July 2007

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Steroidal isomers with uniform mass spectra of their per-TMS derivatives: synthesis of 17-hydroxyandrostan-3-ones, androst-1-, and -4-ene-3,17-diols.
Maria K Parr, Josef Zapp, Michael Becker, Georg Opfermann, Ulrike Bartz

Steroids· June 2007

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Metabolism of 4-hydroxyandrostenedione and 4-hydroxytestosterone: Mass spectrometric identification of urinary metabolites.
Maxie Kohler, Maria K Parr, Georg Opfermann, Mario Thevis, Nils Schlörer

Steroids· March 2007

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Characterization of chemically modified steroids for doping control purposes by electrospray ionization tandem mass spectrometry.
Mario Thevis, Ute Bommerich, Georg Opfermann, Wilhelm Schänzer

J Mass Spectrom· April 2005

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N-methyl-N-trimethylsilyltrifluoroacetamide-promoted synthesis and mass spectrometric characterization of deuterated ephedrines.
Mario Thevis, Georg Opfermann, Wilhelm Schänzer

Eur J Mass Spectrom (Chichester)· January 2005

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Electrospray ionization mass spectrometric characterization and quantitation of xanthine derivatives using isotopically labelled analogues: an application for equine doping control analysis.
Mario Thevis, Georg Opfermann, Oliver Krug, Wilhelm Schänzer

Rapid Commun Mass Spectrom· August 2004

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Liquid chromatography/electrospray ionization tandem mass spectrometric screening and confirmation methods for beta2-agonists in human or equine urine.
Mario Thevis, Georg Opfermann, Wilhelm Schänzer

J Mass Spectrom· November 2003

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Urinary concentrations of morphine and codeine after consumption of poppy seeds.
Mario Thevis, Georg Opfermann, Wilhelm Schänzer

J Anal Toxicol· July 2003

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