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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
chemistry
Selenium characterization in the global rice supply chain
Environmental Science and Technology, Volume 43, No. 15, Year 2009
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Description
For up to 1 billion people worldwide, insufficient dietary intake of selenium (Se) is a serious health constraint. Cereals are the dominant Se source for those on low protein diets, as typified by the global malnourished population. With crop Se content constrained largely by underlying geology, regional soil Se variations are often mirrored by their locally grown staples. Despite this, the Se concentrations of much of the world's rice, the mainstay of so many, is poorly characterized, for both total Se content and Se speciation. In this study, 1092 samples of market sourced polished rice were obtained. The sampled rice encompassed dominant rice producing and exporting countries. Rice from the U.S. and India were found to be the most enriched, while mean average levels were lowest in Egyptian rice: ∼32-fold less than their North American equivalents. By weighting country averages by contribution to either global production or export, modeled baseline values for both were produced. Based on a daily rice consumption of 300 g day-1, around 75% of the grains from the production and export pools would fail to provide 70% of daily recommended Se intakes. Furthermore, Se localization and speciation characterization using X-ray fluorescence (μ -XRF) and X-ray absorption near edge structure (μ -XANES) techniques were investigated in a Se-rich sample. The results revealed that the large majority of Se in the endosperm was present in organic forms. © 2009 American Chemical Society.
Authors & Co-Authors
Williams, Paul N.
China, Beijing
Research Center for Eco-environmental Sciences Chinese Academy of Sciences
United Kingdom, Aberdeen
University of Aberdeen
Denmark, Copenhagen
Københavns Universitet
Lombi, E.
China, Beijing
Research Center for Eco-environmental Sciences Chinese Academy of Sciences
Denmark, Copenhagen
Københavns Universitet
Australia, Adelaide
University of South Australia
Australia, Adelaide
Crc Care
Sun, Guo Xin
China, Beijing
Research Center for Eco-environmental Sciences Chinese Academy of Sciences
Denmark, Copenhagen
Københavns Universitet
Scheckel, Kirk
United States, Cincinnati
Us Epa National Risk Management Research Laboratory
Zhu, Yongguan
China, Beijing
Research Center for Eco-environmental Sciences Chinese Academy of Sciences
Denmark, Copenhagen
Københavns Universitet
China, Beijing
Chinese Academy of Sciences
Feng, Xinbin Bin
China, Guiyang
Institute of Geochemistry Chinese Academy of Sciences
Zhu, Jianming
China, Guiyang
Institute of Geochemistry Chinese Academy of Sciences
Carey, Anne Marie
United Kingdom, Aberdeen
University of Aberdeen
Adomako, Eureka E.A.
United Kingdom, Aberdeen
University of Aberdeen
Ghana, Accra
University of Ghana
Lawgali, Youseff
United Kingdom, Aberdeen
University of Aberdeen
Deacon, Claire M.
United Kingdom, Aberdeen
University of Aberdeen
Meharg, Andrew A.
United Kingdom, Aberdeen
University of Aberdeen
Statistics
Citations: 188
Authors: 12
Affiliations: 9
Identifiers
Doi:
10.1021/es900671m
ISSN:
0013936X
e-ISSN:
15205851
Study Design
Cross Sectional Study