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- W1892142783 abstract "We established a method for using HPLC and diode-array ultraviolet scanning to quantitate soy isoflavonoids in foods and in human plasma, urine, and breast milk. The analytes occurring as glycoside conjugates were hydrolyzed enzymatically before HPLC analysis if extracted from biological matrices or were subjected to direct HPLC analysis after extraction from foods. We monitored the isoflavones daidzein, genistein, glycitein, formononetin, and biochanin-A and their mammalian metabolites equol and O-desmethylangolensin in human plasma, urine, and breast milk. Analytes were identified by absorbance patterns, fluorometric and electrochemical detection. and comparison with internal and external standards. In addition, we identified analytes by using gas chromatography-mass spectrometry after trimethylsilylation. The HPLC method was also used to measure concentrations of isoflavones and their glucoside conjugates in various soy-based infant formulas. Total isoflavone concentrations varied between 155 and 281 mg/kg. After one woman received a moderate challenge with 20 g roasted soybeans (equivalent to 37 mg isoflavones), we detected mean total isoflavone concentrations of approximately 2.0 micromol/L in plasma, 0.2 micromol/L in breast milk, and 3.0 micromol/h in urine. According to our measurements, with adjustment for body weight, isoflavonoid exposure is 4-6 times higher in infants fed soy-based formula than in adults eating a diet rich in soyfoods (approximately 30 g/d). Implications of the presented results for the potential cancer-preventing activity of isoflavones by exposing newborn infants to these phytochemicals are discussed." @default.
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- W1892142783 date "1998-12-01" @default.
- W1892142783 modified "2023-10-15" @default.
- W1892142783 title "Isoflavones in human breast milk and other biological fluids" @default.
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- W1892142783 doi "https://doi.org/10.1093/ajcn/68.6.1466s" @default.
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