Hormone and phytoestrogen analysis
Blood was centrifuged at 1500 g for 15 min and serum or
plasma was frozen at®20 °C until use. Serum hormones
were assayed by immunoassay [18±21].
Phytoestrogens were prepared for analysis using the
method of Morton et al. [22], with the following
modi®cations: the Helix pomatia extract was not puri®ed
in order to minimize enzyme de-activation, DEAE±
Sephadex was used to fractionate the samples and N-tertbutyldimethylsilyl-
N-methyltrifluoroacetamide was
used for derivatization. Internal standards daidzein-d$,
genistein-d% and equol-d% were purchased from the
Adlercreutz group (University of Helsinki, Finland).
Phytoestrogens were determined by isotope dilution
GLC±MS, in the selected ion monitoring mode, using an
HP 5973 detector in conjunction with an HP 6890 series
gas chromatograph equipped with a capillary column
(0.25 lm BP-1; 0.22 mm¬12 m), with helium as the
carrier gas.
Hormone and phytoestrogen analysis
Blood was centrifuged at 1500 g for 15 min and serum or
plasma was frozen at®20 °C until use. Serum hormones
were assayed by immunoassay [18±21].
Phytoestrogens were prepared for analysis using the
method of Morton et al. [22], with the following
modi®cations: the Helix pomatia extract was not puri®ed
in order to minimize enzyme de-activation, DEAE±
Sephadex was used to fractionate the samples and N-tertbutyldimethylsilyl-
N-methyltrifluoroacetamide was
used for derivatization. Internal standards daidzein-d$,
genistein-d% and equol-d% were purchased from the
Adlercreutz group (University of Helsinki, Finland).
Phytoestrogens were determined by isotope dilution
GLC±MS, in the selected ion monitoring mode, using an
HP 5973 ตรวจจับร่วมกับ HP 6890 ชุดแก๊สโครมาโตกราฟพร้อมกับเส้นเลือดฝอย
( 0.25 โดยคอลัมน์ bp-1 ; ¬ 0.22 มม. 12 ม. ) พร้อมเลี่ยมเป็น
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