Simultaneous determination of 11 phytoestrogens in human serum using a 2 min liquid chromatography/tandem mass spectrometry method

Departments of Pharmacology & Toxicology, University of Alabama at Birmingham, Birmingham, AL 35294, USA.
Journal of chromatography. B, Analytical technologies in the biomedical and life sciences (Impact Factor: 2.73). 03/2010; 878(13-14):994-1002. DOI: 10.1016/j.jchromb.2010.02.032
Source: PubMed


A rapid 2 min liquid chromatography-tandem mass spectrometry (LC-MS/MS) method operating in multiple reaction ion monitoring mode was developed and validated that allows for the characterization and simultaneous quantification of 11 phytoestrogen metabolites with mass transitions m/z 241/119 (equol), 253/132 (daidzein), 255/149 (dihydrodaidzein), 257/108 (O-desmethylangolesin), 269/133 (genistein), 283/184 (glycitein), 267/191 (formononetin), 289/109 (biochanin A), 267/91 (coumestrol), enterodiol (301/253), and enterolactone (297/253). The method was demonstrated to be specific and sensitive, and a linear response for each phytoestrogen was observed over a range of 1-5000 ng/mL in human serum with the exception of dihydrodaidzein, whose lower limit of quantification was 2 ng/mL. The separation was carried out on a Synergi Polar-RP 2.5 micron (50 mm x 2.0 mm i.d.) column at 50 degrees C with water and acetonitrile (both containing 10 mM ammonium acetate) as the mobile phase under gradient conditions at a flow rate of 0.75 mL/min. This LC-MS/MS method is very useful for high-throughput analysis of phytoestrogens and proved to be simple, sensitive, reproducible, and reliable.

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    • "Phytoestrogens' analysis was based on different protocols previously published, with certain modifications (Prasain et al., 2010; Wyns et al., 2010). The method was conducted on an "
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    • "Adherence was confirmed through assessment of serum isoflavones in a random subsample of participants at baseline (N = 32) and 16 weeks (N = 94). A rapid 2-minute liquid chromatography-tandem mass spectrometry (LC-MS/MS) method operating in multiple reaction ion monitoring mode was used for the measurement of daidzein, genistein, and glycitein, as described by Prasain et al. [27]. This assay demonstrated a linear response for each analyte observed over a range of 1 to 5000 ng/mL (all R ≥ 0.99). "
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