Isotope-dilution mass spectrometry for quantification of urinary active androgens separated by gas chromatography
- Isotope-dilution mass spectrometry for quantification of urinary active androgens separated by gas chromatography
- 이수현; 최만호; 이원용; 정봉철
- androgen; testosterone; isotope-dilution; GC-MS; drug efficacy; 201101로 등록되어있었음
- Issue Date
- Mass Spectrometry Letters
- VOL 1, NO 1, 29-32
- Cross reacting antibodies can cause an overestimation of the results of immunoassays. Therefore, alternative methods
are needed for the accurate quantification of steroids. Gas chromatography combined with isotope-dilution mass spectrometry
(GC-IDMS) is developed to quantify urinary active androgens, testosterone, epitestosterone and dihydrotestosterone, which are
clinically relevant androgens to both hair-loss and prostate diseases. The method devised involves enzymatic hydrolysis with β-
glucuronidase, solid-phase extraction, liquid-liquid extraction using methyl tert-butyl ether and subsequent conversion to pentafluorophenyldimethylsilyl-
trimethylsilyl (flophemesyl-TMS) derivatives for sensitive and selective analysis in selected-ion
monitoring mode. Flophemesyl-TMS derivatization not only eliminates matrix interference but also has a good peak resolution
within a 6 min-run. A selective and sensitive GC technique with flophemesyl-TMS derivatives also allows accurate quantitative
analysis of three active androgens when combined with IDMS. The limit of quantification of the three analytes was <50 pg/mL,
and extraction recoveries ranged from 91.9 to 102.1%. The precision and accuracy were 1.2~6.5% and 89.0~106.7%, respectively.
This GC-IDMS method can be useful for evaluating the drug efficacy and monitoring the biological processes responsible
for male-pattern baldness and prostate diseases.
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