Investigations Into Structures of In Vitro-Derived Phase I Metabolites of a Novel 20-Keto-Steroid S42 by GC-EI HR MS Analysis and Chemical Synthesis.

IF 2.6 3区 医学 Q2 BIOCHEMICAL RESEARCH METHODS
Hui-Chung Wen, Felicitas Wagener, Thomas Piper, Jörg Neudörfl, Mario Thevis, Mathias Schäfer
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引用次数: 0

Abstract

S42, 4-Methyl-19-norpregna-1,3,5(10)-trien-20-one a new 20-keto-steroid, is a novel selective androgen receptor modulator (SARM). The World Anti-Doping Agency (WADA) bans the use of SARMs in sports at all times. In preparation of a sensitive detection procedure to control for S42 abuse, in vitro metabolism experiments were conducted and biotransformation products were analyzed with GC-EI MS-orbitrap instrumentation. S42-C20-OH, S42-C6ß-OH, and S42-C7α-OH were synthesized as reference material to study their exemplary EI-HR (electron ionization- high resolution) mass spectra. Additionally, S42-d7, synthesized earlier with 2H-labels at carbon atoms C1, C2, C3, C6, and C7, was used for the in vitro metabolism study. Comparison of the respective mass spectra of labeled and unlabeled reference materials and of specifically mass-shifted fragment ions provided the foundation for the structure elucidation of S42 in vitro phase I metabolites. Molecular ions of selected S42 phase I metabolites found in the in vitro experiments were submitted to higher energy collisional dissociation (HCD) MS2-product ion experiments to allow straightforward and secured assignment and interpretation of fragmentation patterns. At least eight phase I metabolites of S42 were identified in the in vitro study and analyzed as tri-methyl-silyl ether derivatives. Specifically, different singly, doubly, and triply hydroxylated metabolites of S42 were identified and analyzed with GC-EI HR MS.

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来源期刊
Drug Testing and Analysis
Drug Testing and Analysis BIOCHEMICAL RESEARCH METHODS-CHEMISTRY, ANALYTICAL
CiteScore
5.90
自引率
24.10%
发文量
191
审稿时长
2.3 months
期刊介绍: As the incidence of drugs escalates in 21st century living, their detection and analysis have become increasingly important. Sport, the workplace, crime investigation, homeland security, the pharmaceutical industry and the environment are just some of the high profile arenas in which analytical testing has provided an important investigative tool for uncovering the presence of extraneous substances. In addition to the usual publishing fare of primary research articles, case reports and letters, Drug Testing and Analysis offers a unique combination of; ‘How to’ material such as ‘Tutorials’ and ‘Reviews’, Speculative pieces (‘Commentaries’ and ‘Perspectives'', providing a broader scientific and social context to the aspects of analytical testing), ‘Annual banned substance reviews’ (delivering a critical evaluation of the methods used in the characterization of established and newly outlawed compounds). Rather than focus on the application of a single technique, Drug Testing and Analysis employs a unique multidisciplinary approach to the field of controversial compound determination. Papers discussing chromatography, mass spectrometry, immunological approaches, 1D/2D gel electrophoresis, to name just a few select methods, are welcomed where their application is related to any of the six key topics listed below.
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