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  • Hans Geyer, Maria Kristina Parr, Karsten Koehler, Ute Mareck, Wilhelm Schaenzer, Mario Thevis
  • Medicine, Chemistry
  • Journal of mass spectrometry : JMS
  • 2008 (First Publication: 1 July 2008)
  • Since 1999 several groups have analyzed nutritional supplements with mass spectrometric methods (GC/MS, LC/MS/MS) for contaminations and adulterations with doping substances. These investigationsContinue Reading
  • Maria Kristina Parr, Andy Zoellner, +5 authors Wilhelm Schaenzer
  • Chemistry, Medicine
  • Toxicology letters
  • 2012 (First Publication: 1 September 2012)
  • The metabolism of a variety of anabolic steroids frequently misused for doping purposes has been investigated in the last years. This research mainly focused on main and long-term metabolitesContinue Reading
  • Maria Kristina Parr, Piwen Zhao, +9 authors Patrick Diel
  • Biology, Medicine
  • Molecular nutrition & food research
  • 2014 (First Publication: 1 September 2014)
  • SCOPE The phytoectysteroid ecdysterone (Ecdy) was reported to stimulate protein synthesis and enhance physical performance. The aim of this study was to investigate underlying molecular mechanismsContinue Reading
  • Maria Kristina Parr, Hans Geyer, Bernhard Hoffmann, Karsten Koehler, Ute Mareck, Wilhelm Schaenzer
  • Chemistry, Medicine
  • Biomedical chromatography : BMC
  • 2007 (First Publication: 1 February 2007)
  • In numerous studies it has been demonstrated that several nutritional supplements contain prohormones not declared on the label. In the current study two products (effervescent tablets) containingContinue Reading
  • Andy Zoellner, Maria Kristina Parr, +6 authors Matthias Bureik
  • Medicine, Biology
  • Biological chemistry
  • 2009
  • Abstract Anabolic-androgenic steroids are some of the most frequently misused drugs in human sports. Recently, a previously unknown urinary metabolite of metandienone,Continue Reading