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Simultaneous Determination of Urinary Phytoestrogens and Estrogens by Gas Chromatography/Mass spectrometry
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
1998, v.11 no.5, pp.374-385
Yang,
Y. J., Lee,
S. H., &
Chung,
B.
C.
(1998). Simultaneous Determination of Urinary Phytoestrogens and Estrogens by Gas Chromatography/Mass spectrometry. Analytical Science and Technology, 11(5), 374-385.
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Abstract
Phytoestrogens are biologically active compounds derived from plants foods. It had been suggested that phytoestrogens, by inhibiting aromatase in peripheral and/or cancer cells and lowering estrogen levels, may play a protective role as antipromotional compounds during growth of estrogen-dependent cancers. Therefore, simultaneous analysis of estrogens and phytoestrogens is necessary to elucidate the possible involvement of phytoestrogens in estrogen metabolism. In this view, we developed a simple and reproducible procedure to quantitatively determine estrogen and phytoestrogen metabolites. The proposed method consisted of solid phase extraction using preconditioned Serdolit AD-2 resin, enzyme hydrolysis with <TEX>${\beta}$</TEX>-glucuronidase/arylsulfatase from Helix pomatia, liquid-liquid extraction and TMS-ether derivatization. And the final determination was carried out by gas chromatography/mass spectrometry (GC/MS) in selected ion monitoring mode (SIM). The precision and accuracy of this method was evaluated through within-a-day and day-to-day test. Recovery range and detection limit were 71.96~105.66%, 2~4 ng/mL, respectively. Using this method, 17 estrogen and 5 phytoestrogen compositions in urine of normal subjects were analyzed. It was found that amounts and relative distribution of urinary phytoestrigens and estrogens showed different pattern in male and female subjects.
- keywords
- gas chromatography/mass spectrometry, phytoestrogen, estrogen
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