M
Mario Thevis
Researcher at German Sport University Cologne
Publications - 512
Citations - 13310
Mario Thevis is an academic researcher from German Sport University Cologne. The author has contributed to research in topics: Mass spectrometry & Metabolite. The author has an hindex of 53, co-authored 476 publications receiving 11753 citations. Previous affiliations of Mario Thevis include Saarland University & University of California, Los Angeles.
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Journal ArticleDOI
Mass spectrometry of steroid glucuronide conjugates. I. Electron impact fragmentation of 5α-/5β-androstan-3α-ol-17-one glucuronides, 5α-estran-3α-ol-17-one glucuronide and deuterium-labelled analogues
TL;DR: The fragmentation and mass spectrometric behaviour of several steroid glucuronide conjugates of endogenous and anabolic steroids after derivatization to pertrimethylsilylated products and to methyl ester pertrimsidic and steroidal moieties were investigated using GC/MS ion trap andGC/MS quadrupole instruments.
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Determination of the deuterium/hydrogen ratio of endogenous urinary steroids for doping control purposes
TL;DR: In order to determine the naturally occurring D/H ratios of all implemented steroids, a population of 18 male subjects was analyzed andlevant mean Delta values among selected steroids were calculated which allowed us to study the metabolic pathways and production sites of all the implemented steroids.
Journal ArticleDOI
Doping in sport
Wilhelm Schänzer,Mario Thevis +1 more
TL;DR: In this article, the current list of prohibited substances and methods of doping, effects and side effects of classes of drugs are summarized, and statistics are presented describing positive test results reported during the years 2003-2005.
Journal ArticleDOI
Gas phase reaction of substituted isoquinolines to carboxylic acids in ion trap and triple quadrupole mass spectrometers after electrospray ionization and collision-induced dissociation.
TL;DR: Dissociation pathways for [(1-chloro-4-hydroxy-isoquinoline-3-carbonyl)-amino]-acetic acid were suggested that can be further utilized for the characterization of structurally related compounds or metabolic products in clinical, forensic, or doping control analysis.
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Analysis of selective androgen receptor modulators by gas chromatography-microchip atmospheric pressure photoionization-mass spectrometry
Laura Luosujärvi,Markus Haapala,Mario Thevis,Ville Saarela,Sami Franssila,Raimo A. Ketola,Risto Kostiainen,Tapio Kotiaho +7 more
TL;DR: A gas chromatography-microchip atmospheric pressure photoionization-mass spectrometric method was developed and used for the analysis of three 2-quinolinone-derived selective androgen receptor modulators (SARMs) and the proof-of-principle of gas Chromatography- micro chip atmospheric pressure chemical ionization-Orbitrap MS was demonstrated.