Genistein assay methods

The ID-GC-MS-SIM method of Adlecreutz and coworkers (1993) is perhaps the most frequently used in clinical and medical studies, although intra- and total-assay variabilities of all analytes are considered to be high, probably reflecting low-analyte concentrations in biological fluids (Wilkinson et al., 2002). Other GC-MS methods report lower inter-assay variation of 6%-ll% isoflavones in serum. The latest method of measuring urinary excretion of isoflavones (daidzein, genistein, equol. 

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