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Selenium in wheat from farming to food

By Min Wang, Baoqiang Li, Shuang Li, Ziwei Song, Fanmei Kong, Xiaocun Zhang

Posted 19 Jul 2021
bioRxiv DOI: 10.1101/2021.07.17.452805

Selenium (Se) plays an important role in human health. Approximately 80% of the world's population does not consume the recommended Se levels. Wheat is an important staple food and Se source for most people in the world. This article summarizes literatures about Se from 1936 to 2020 to investigate Se in wheat farming soil, wheat, and its derived foods. Selenium fortification and the recommended Se level in wheat were also discussed. Results showed that Se contents in wheat farming soil, grain, and its derived foods were 3.8-552 (mean, 220.99), 0-8,270 (mean, 347.30), and 15-2,372 (mean, 211.86) g {middle dot}kg-1, respectively. Selenium content could be increased by leaf Se fertilizer application, and the contents in grain, flour, and its derived foods could be improved from 93.94 to 1,181.92, 73.06 to 1,007.75, and 86.90 to 587.61 g {middle dot}kg-1 in average. Both Se content in farming soil and grain, foliar Se fertilizer concentration rate and grain Se increased rate showed significant linear relationship. The recommended Se fortification level of wheat in different countries was calculated in China, India, and Spain, with recorded values of 18.53-23.96, 2.65-3.37, and 3.93-9.88 g {middle dot}hm-2, respectively. Thus, suitable Se fortification in farming effectively improved Se content in wheat grain and its derived foods. Appropriate milling processing and food type are also important factors to be considered to meet people's Se requirement by wheat.

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