European Astronaut Centre

Supercritical Fluid Chromatography for Expedited Sample Clean‐Up in Isotope Ratio Mass Spectrometry Including Cholesterol as New Endogenous Reference Compound

ABSTRACT Doping control samples showing elevated urinary concentrations and concentration ratios of testosterone or testosterone metabolites are forwarded to isotope ratio mass spectrometry‐based determinations in order to differentiate between naturally elevated concentrations a...