硒
硒酸盐
化学
生物强化
遗传算法
食品科学
人口
环境化学
生物利用度
动物科学
生物
微量营养素
进化生物学
社会学
生物信息学
人口学
有机化学
作者
Jing-Yu Zeng,Dong-Xing Guan,Zhihua Dai,Jiayi Chen,Wenjie Dong,Songlin Ding,Q. Lena
标识
DOI:10.1016/j.seh.2023.100037
摘要
Diet intake accounts for >90% of selenium (Se) exposure in humans, with rice being the main source of Se intake for >60% of the Chinese population. In this study, 48 rice grain samples labeled Se-enriched were obtained from 22 major rice producing areas in China through online sources. Their total Se contents, Se speciation, and Se bioaccessibility were evaluated to provide a holistic view of Se-enriched rice in the market. The total Se contents were 0.006-0.951 μg g−1 (average 0.249 μg g−1), which showed great regional variations, with 73% of the samples satisfying the Se-enriched standard based on GB/T22499-2008 (0.04-0.30 mg kg−1). Over 80% of Se in the rice samples was organic Se species including selenomethionine, selenocysteine and methylselenocysteine, with selenomethionine being the main Se species, accounting for 61-98%. Based on a modified physiologically-based extraction test (PBET), the Se bioaccessibility in 33 selected samples was 8.05-49.6% (28.6%) in the gastric phase and 18.1-117% (82.5%) in the intestinal phase. Further, Se bioaccessibility was positively correlated with organic Se (r=0.89-0.93), but not with inorganic Se (selenite and selenate), suggesting that Se bioaccessibility depended on organic Se in these rice grains. The data call for re-evaluation of Se-enriched rice in the market. Further, the potential risk of long-term consumption of Se-enriched rice in the market towards human health should be further studied.
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