Journal article
Uptake of natural and synthetic estrogens by maize seedlings
Journal of agricultural and food chemistry, Vol.60(34), pp.8264-8271
08/29/2012
DOI: 10.1021/jf3014074
PMID: 22816790
Abstract
Runoff from manure-fertilized crop fields constitutes a significant source of natural estrogens (e.g., estradiol [17β-E2] and estrone [E1]) and synthetic estrogen mimics (e.g., zeranol [α-ZAL] and zearalanone [ZAN]) in the environment. However, processes such as sorption to and uptake by plants may inhibit the environmental mobility of hormonally active compounds. Sorption to dried root tissue was assessed in batch sorption tests, and resulting sorption isotherms were nonlinear at aqueous concentrations below 0.1 μM and linear above that limit. To evaluate the role of crop plants in the environmental fate of such compounds, we exposed hydroponic solutions containing 2 μM 17β-E2, E1, α-ZAL, or ZAN to maize seedlings. After 22 days of exposure, α-ZAL and ZAN concentrations decreased by more than 96%, and 17β-E2 and E1 were undetectable. The decrease in α-ZAL and ZAN concentrations in maize-exposed solutions was initially slow, but the observed uptake exceeded that predicted by sorption alone within 3 d. All four estrogens were detected in root tissues at concentrations up to 0.19 μmol g(-1), with concentrations peaking after 1-3 days of exposure. Only 17β-E2 and α-ZAL were detected in shoots, and maximum concentrations were measured after 2 days for 17β-E2 (0.02 μmol g(-1)) and 16 days for α-ZAL (0.8 nmol g(-1)). Concentrations measured in root and shoot tissues were 82% or less than those predicted by a partition-limited uptake model, which is attributed to transformation and possibly irreversible binding processes.
Details
- Title: Subtitle
- Uptake of natural and synthetic estrogens by maize seedlings
- Creators
- Marcella L Card - Environmental Science Graduate Program, and ‡School of Earth Sciences, The Ohio State University , 125 South Oval Mall, Columbus, Ohio 43210, United StatesJerald L SchnoorYu-Ping Chin
- Resource Type
- Journal article
- Publication Details
- Journal of agricultural and food chemistry, Vol.60(34), pp.8264-8271
- Publisher
- United States
- DOI
- 10.1021/jf3014074
- PMID
- 22816790
- ISSN
- 0021-8561
- eISSN
- 1520-5118
- Language
- English
- Date published
- 08/29/2012
- Academic Unit
- Civil and Environmental Engineering; Occupational and Environmental Health
- Record Identifier
- 9983991946802771
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