Uptake of natural and synthetic estrogens by maize seedlings

Card, Marcella L., Schnoor, Jerald L. and Chin, Yu-Ping (2012) Uptake of natural and synthetic estrogens by maize seedlings. Journal of Agricultural and Food Chemistry, 60 34: 8264-8271. doi:10.1021/jf3014074

Author Card, Marcella L.
Schnoor, Jerald L.
Chin, Yu-Ping
Title Uptake of natural and synthetic estrogens by maize seedlings
Journal name Journal of Agricultural and Food Chemistry   Check publisher's open access policy
ISSN 0021-8561
Publication date 2012-07-20
Sub-type Article (original research)
DOI 10.1021/jf3014074
Volume 60
Issue 34
Start page 8264
End page 8271
Total pages 8
Place of publication Washington, DC, United States
Publisher American Chemical Society
Collection year 2013
Language eng
Formatted 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.
Keyword 17β-estradiol
Manure fertilization
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Non HERDC
National Research Centre for Environmental Toxicology Publications
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Created: Thu, 04 Apr 2013, 11:39:50 EST by Robyne Anderson on behalf of National Res Centre For Environmental Toxicology