Use of dietary components to reduce bioaccessibility and bioavailability of cadmium in rice.

Reducing Cd bioavailability in systemic circulation is an alternative strategy to reduce Cd exposure. The influence of 39 dietary components on Cd bioaccessibility in water or rice were determined using an in vitro gastrointestinal model, following which an in vivo bioassay was used to determine the most effective components on Cd bioavailability in rice. The results showed that several components significantly reduced the solubility of Cd (10-98%) in intestinal phase. Tannic acid, TiO2, zinc gluconate, CaCl2 and proanthocyanidins were the most effective in decreasing Cd bioaccessibility in rice, with reductions of 93-97%, 54-61%, 32-49%, 24-32% and 11-14%, respectively. Upon adding the dietary components, the reduction rates of the Cd-relative bioavailability (Cd-RBA) were 20-58% and 10-31% in the kidney and liver, respectively. The results may have important implications for reducing health risks associated with Cd exposure via consumption of rice.