Quantitative Relation between Feces Protein Particles and Rice Protein Bodies

Abstract

In vitro-digestion tests of rice protein bodies (RPB) by successive incubation of pepsin, trypsin and steapsin, indicated that most of RPB were easily digested, but 30% of RPB in number, or 16_??_18% in amount were indigestible, and remained as particles smaller (1.0_??_3.5 μ) in diameter than RPB (1.5_??_4.0 μ). These data coincided with the result of in vivo-digestion test, that the numbers of excreted feces protein particles (FPP) corresponded to 28% of RPB in diets, and also with some reports showing 84% as the in vivo-digestion rates of rice protein. The indigestible part of rice protein was concluded to be excreted as FPP, the amount of which was equivalent 16% of the RPB supplied with the daily intake of rice.