Selenium Characterization in the Global Rice Supply Chain

被引:196
作者
Williams, Paul N. [1 ,2 ,3 ]
Lombi, Enzo [2 ,3 ]
Sun, Guo-Xin [2 ,3 ]
Scheckel, Kirk [4 ]
Zhu, Yong-Guan [2 ,3 ,5 ]
Feng, Xinbin [6 ]
Zhu, Jianming [6 ]
Carey, Anne-Marie [1 ]
Adomako, Eureka [1 ,7 ]
Lawgali, Youseff [1 ]
Deacon, Claire [1 ]
Meharg, Andrew A. [1 ]
机构
[1] Univ Aberdeen, Inst Biol & Environm Sci, Aberdeen AB24 3UU, Scotland
[2] Chinese Acad Sci, Ecoenvironm Sci Res Ctr, Beijing 100085, Peoples R China
[3] Univ Copenhagen, Fac Life Sci, Dept Agr & Ecol, DK-1871 Frederiksberg C, Denmark
[4] US EPA, Natl Risk Management Res Lab, Cincinnati, OH 45224 USA
[5] Chinese Acad Sci, Inst Urban Environm, Xiamen 361003, Peoples R China
[6] Chinese Acad Sci, Inst Geochem, Guiyang 100049, Peoples R China
[7] Univ Ghana, Dept Bot, Legon LG 55, Accra, Ghana
基金
加拿大自然科学与工程研究理事会;
关键词
MARKET BASKET SURVEY; RURAL BANGLADESH; HUMAN HEALTH; PLANTS; SOIL; BIOFORTIFICATION; MICRONUTRIENTS; SPECIATION; ENERGY; CROPS;
D O I
10.1021/es900671m
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
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: similar to 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 (mu-XRF) and X-ray absorption near edge structure (mu-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.
引用
收藏
页码:6024 / 6030
页数:7
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