Time-course characteristics for the digestion of endogenous as well as exogenous protein in the small intestine: a case study with rats fed a [15N]-soy protein isolate |
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| Authors: | Nakai Yuji Okada Shinji Matsumoto Ichiro Asakura Tomiko Kimura Hiroko |
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| Institution: | Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo 113-8687, Japan. |
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| Abstract: | A study was conducted to evaluate a net value of exogenous (dietary) protein nutrition in rats fed a 15N]-labeled soy protein isolate (SPI). Although 15N]-SPI-derived nitrogen reached a plateau 2 hr after feeding, it accounted for only a half of the total nitrogen in the small intestine. 15N was confirmed that was normally transported to liver, kidney, spleen, and brain. The present study reveals the large degree of participation of endogenous proteins in dietary SPI during small-intestinal digestion. |
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