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

Yuji NAKAI; Shinji OKADA; Ichiro MATSUMOTO; Tomiko ASAKURA; Hiroko KIMURA

doi:10.1271/bbb.69.855

Food & Nutrition Science Notes

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

Yuji NAKAI, Shinji OKADA, Ichiro MATSUMOTO, Tomiko ASAKURA, Hiroko KIMURA

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Keywords: endogenous protein digestion, soy protein isolate, ¹⁵N-labeling, dietary protein digestion

JOURNAL FREE ACCESS

2005 Volume 69 Issue 4 Pages 855-856

DOI https://doi.org/10.1271/bbb.69.855

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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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