Kubota M.,Niigata University |
Saito Y.,Kyoto Prefectural University |
Masumura T.,Kyoto Prefectural University |
Kumagai T.,Kameda Seika Co. |
And 3 more authors.
Bioscience, Biotechnology and Biochemistry
Rice prolamin, constituting type-I protein body (PB-I), is indigestible and causes deterioration of rice protein nutritional quality. In this study, the in vivo digestibility of rice protein isolates was investigated by tracing their intraluminal transit in the gastrointestinal (GI) tract of rats by western blotting and by observing the structures excreted in the feces by electron microscopy. Two types of rice protein isolates, produced by alkali extraction (AE-RP) and by starch degradation (SD-RP), were compared. The protein patterns in the isolates were similar, but their digestion in the GI-tract showed striking differences. In the AE-RP group, 13-kDa prolamin (13P) quickly disappeared in the lower GI tract and was not excreted in the feces. By contrast, in the SD-RP group, 13P accumulated massively and nearly intact PB-Is were excreted. These results indicate that the in vivo digestibility of prolamin can be improved by alkali extraction through structural changes to it. Source
Kubota M.,Niigata University |
Watanabe R.,Niigata University |
Kabasawa H.,Niigata University |
Iino N.,Niigata University |
And 4 more authors.
British Journal of Nutrition
The effect of rice protein (RP) on diabetic nephropathy in non-obese, spontaneous type 2 diabetic Goto-Kakizaki (GK) rats was investigated. GK rats at 7 weeks of age were fed 20Â % RP or casein (C) in standard or high-sucrose diets for 10 weeks. Plasma total cholesterol, TAG, alkaline phosphatase (ALP), adiponectin, creatinine and urinary albumin excretion (UAE) were measured and renal histology was evaluated. Compared with C, RP lowered plasma TAG and improved plasma adiponectin levels in GK rats fed the standard diet (P<Â 0·05), and also lowered total cholesterol and ALP in high-sucrose-fed GK rats (P<Â 0·05). RP markedly suppressed the sharp increase in UAE when GK rats were fed high-sucrose diets (P<Â 0·05), and prevented glomerular mesangial matrix expansion in the deep renal cortex near the corticomedullary junction (P<Â 0·05). These results strongly indicate that dietary RP can ameliorate the progression of diabetic nephropathy at an early stage compared with C. Copyright © The Authors 2013Â. © 2013 The Authors. Source
Kameda Seika Co. | Date: 2015-04-27
Kameda Seika Co. and Niigata University | Date: 2012-11-05
The objective of the present invention is to provide a high-purity rice-protein composition with improved tongue feel and a melt-in-the-mouth quality, and a method for manufacturing the composition. The rice-protein composition comprises glutelin and prolamine, the protein content with respect to the solid content being at least 90%. Rice protein extracted by an alkaline solution from rice or rice flour is neutralized and coagulated at a temperature no lower than 40 80 DEG C., or is coagulated by adding a divalent metal ion and then neutralized, or glucono-delta-lactone is added and the solution is heated to gel the protein; by therein keeping the pH of the rice-protein composition no lower than 7.0 or no higher than 4.0, a rice-protein composition with extremely good dispersibility and tongue feel can be obtained. Further, by heating to at least 80 DEG C. after adjusting pH, a composition with high water absorbency is achieved.
Kameda Seika Co. | Date: 2011-11-02
Confectionery, namely, Rice crackers, Pellet-shaped rice crackers, Rice cakes, Rice-based snack foods, Cereal-based snack foods.