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- W2024480780 abstract "Trimethylsilyl ether and methyloxime-trimethylsilyl ether derivatives of 3α,11β,21-trihydroxy-5β-pregnan-20-on-18-al (tetrahydroaldosterone) and its etiolactone were analysed by gas Chromatography. The structures were established from the fragmentation pattern during mass spectrometry. A quantitative method for measuring urinary tetrahydroaldosterone is described based on selected-ion-monitoring gas chromatography-mass spectrometry (GC-MS). Urine samples were hydrolysed by β-glucuronidase, 3β-allo-tetrahydroaldosterone was added as internal standard, the steroids were extracted on Amberlite XAD-2 resin then purified by Sephadex LH-20 chromatography. Methyloxime-trimethylsilyl ethers were prepared and the ions of me 638 (M) and 607 (M-31) simultaneously monitored by GC-MS. Both the analyte and internal standard were resolved on OV-1 columns and the peak heights were determined. The ratio of peak height of analyte to internal standard was constant up to 40 ng per injection and the lower limit of sensitivity giving acceptable signal-to-noise ratio was around 200 pg." @default.
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- W2024480780 date "1977-04-01" @default.
- W2024480780 modified "2023-09-28" @default.
- W2024480780 title "Mass spectrometric analysis for tetrahydroaldosterone" @default.
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- W2024480780 doi "https://doi.org/10.1016/0022-4731(77)90023-1" @default.
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