Urine and serum biomonitoring of exposure to environmental estrogens II: Soy isoflavones and zearalenone in pregnant women
- U.S. Food and Drug Administration (FDA), Jefferson, AR (United States)
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Oregon State Univ., Corvallis, OR (United States)
Urine and serum biomonitoring was used to measure internal exposure to selected dietary estrogens in a cohort of 30 pregnant women. Herein exposure was measured over a period comprising one-half day in the field (6 h) and one day in a clinic (24 h). Biomonitoring of the dietary phytoestrogens genistein (GEN), daidzein (DDZ) and equol (EQ), as well as the mycoestrogen, zearalenone (ZEN) and its congeners, was conducted using UPLC-MS/MS. Biomonitoring revealed evidence of internal exposure to naturally occurring dietary estrogens during pregnancy. Urinary concentrations of total GEN, DDZ and EQ were similar to levels reported for general adult U.S. population. Measurable concentrations of total (parent and metabolites) GEN, DDZ and EQ were present in 240, 207 and 2 of 270 serum samples, respectively. Six out of 30 subjects had measurable concentrations of unconjugated GEN and/or DDZ in serum between 0.6 and 7.1 nM. Urine to serum total isoflavone ratios for GEN, DDZ and EQ were 13, 47, and 180, respectively. ZEN and its reductive metabolite, a-zearalenol (a-ZEL), were present in pregnant women (11 out of 30 subjects) as conjugates at levels near the limit of quantification. The average total urinary concentration was 0.10 mg/L for ZEN and 0.11 mg/L for a-ZEL.
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE; USDA; American Chemistry Council
- Grant/Contract Number:
- AC05-76RL01830
- OSTI ID:
- 1988267
- Alternate ID(s):
- OSTI ID: 1467737
- Report Number(s):
- PNNL-ACT-SA-10583
- Journal Information:
- Food and Chemical Toxicology, Vol. 95; ISSN 0278-6915
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Towards A New Approach for the Description of Cyclo–2,4-Dihydroxybenzoate, A Substance Which Effectively Mimics Zearalenone in Imprinted Polymers Designed for Analyzing Selected Mycotoxins in Urine
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journal | March 2019 |
Oestrogenic Endocrine Disruptors in the Placenta and the Fetus
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journal | February 2020 |
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