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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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.

新型20-酮类固醇S42体外代谢产物结构的GC-EI HR - MS分析和化学合成研究
s42,4 -甲基-19-去甲孕酮-1,3,5(10)-三烯-20- 1是一种新的20-酮类固醇,是一种新型的选择性雄激素受体调节剂(SARM)。世界反兴奋剂机构(WADA)在任何时候都禁止在体育运动中使用SARMs。为了建立控制S42滥用的灵敏检测方法,我们进行了体外代谢实验,并用GC-EI MS-orbitrap仪器分析了生物转化产物。合成了S42-C20-OH、S42-C6ß-OH和S42-C7α-OH作为对照物质,研究了它们的EI-HR(电子电离-高分辨率)质谱。此外,先前合成的碳原子C1、C2、C3、C6和C7上有2h标记的S42-d7被用于体外代谢研究。比较标记和未标记的参比物质以及特异性质移片段离子的质谱,为S42体外I相代谢产物的结构解析提供了基础。在体外实验中发现的S42 I相代谢物的分子离子被提交到高能碰撞解离(HCD) ms2产物离子实验中,以允许直接和安全的分配和解释碎片模式。在体外研究中鉴定出至少8种S42的I期代谢物,并分析为三甲基硅醚衍生物。具体来说,用GC-EI HR MS鉴定和分析了S42不同的单、双和三羟基化代谢物。
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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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