Abstract
This study evaluates physical digestion for cooked white rice and cooked brown rice using a novel in vitro gastric digestion simulator (GDS). The GDS enabled direct observation of the disintegration of cooked rice in the presence of simulated human gastric peristalsis. The experiments confirmed a steep increase in the disintegration of cooked white rice during the initial 30min, after which disintegrated contents slowly increased. However, the appearance of liquid phase had little effect on cooked brown rice up to 180min digestion, likely due to the protective action of the bran layer. Our results indicated that cooked rice particles gradually disintegrated into smaller fractions, depending on the type of cooked rice. The present research uses GDS to provide a better understanding of solid food digestion.
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