A comparative study of submicron- and micron-sized rice particles: enzymatic hydrolysis in vitro and food efficiency ratio in vivo

초록

P>Hydrolysis and absorption properties of submicron- (below 1 mu m) and micron-sized (over 100 mu m) powders of raw rice, heat-gelatinized rice, fermented rice and wheat were investigated in vitro and in vivo. Nutrient content such as protein, carbohydrate or vitamin C in the samples was not different significantly between submicron- and micron-sized powders, but it showed difference according to processed type of the powders. Submicron-sized powders were hydrolyzed more easily than micron-sized powders by alpha-amylases such as industrial, human salivary and porcine pancreatic alpha-amylase but not by alpha-glucosidase in all the tested samples. Patterns of blood glucose change were investigated in rats. The highest glucose levels were obtained at 30 min after oral administration in both submicron-and micron-sized powders, but the levels were decreased drastically in groups administered submicron-sized powders, while they were slow and gradual in groups administered micron-sized powders. On the contrary, the body weight gained and food efficiency ratios showed a tendency to be decreased slightly in mice fed with submicron-sized rice powders compared to those with micron-sized rice powder.

키워드