Journal
FOOD CHEMISTRY
Volume 346, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2020.128969
Keywords
Rice; Arsenic; Bioaccessibility; Speciation; Gut microbiota; Distribution
Funding
- National Natural Science Foundation of China [42077400]
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Rice, a staple food for half the world's population, easily accumulates arsenic. This study found that most of the arsenic in rice is in the protein, with different protein fractions containing varying amounts of arsenic. The bioaccessibility of arsenic in rice was positively correlated with the arsenic mass in protein fractions.
Rice, a staple food for half the world's population, easily accumulates arsenic (As). Research on As distribution in rice protein and starch and its relationship with rice As bioaccessibility remains limited. This study investigated As distribution, chemical composition, As bioaccessibility and speciation in rice by continuous extraction and in vitro digestion. Of the total As, 87.5-94.5% was in rice protein and 5.0-9.8% in rice starch. The As amount in different protein fractions decreased as follows: glutelin globulin > albumin > prolamin. As(V), As(III) and DMA in rice were more bioaccessible in the small intestinal phase than the gastric phase, and almost all As(V) dissolved in the small intestinal phase. Bioaccessible As in gastrointestinal digestive solution and As mass in protein fractions (albumin, globulin, and glutelin) were significantly positively correlated (p < 0.05). These results illuminate the bioaccessibility of As to humans consuming As-contaminated rice and avoid overassessment.
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