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Phosphopeptides and soluble calcium in the small intestine of rats given a casein diet

Published online by Cambridge University Press:  09 March 2007

Yeon Sook Lee ,
T. Noguchi  and
H. Naito
Yeon Sook Lee
Affiliation:
Department of Agricultural Chemistry, The University of Tokyo, Bunkyo-Ku, Tokyo 113, Japan
T. Noguchi
Affiliation:
Department of Agricultural Chemistry, The University of Tokyo, Bunkyo-Ku, Tokyo 113, Japan
H. Naito
Affiliation:
Department of Agricultural Chemistry, The University of Tokyo, Bunkyo-Ku, Tokyo 113, Japan
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Abstract

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1. Semi-synthetic diets containing 200 g protein/kg were meal-fed for 1.5 h to groups of rats. The contents of the whole small intestinal tract were collected and the amount of soluble calcium was determined.

2. In the rats given 200 g casein/kg diet, formation of a fraction containing macrophosphopeptide in the small intestine was confirmed by gelfiltration of the intestinal contents on Sephadex G-25. However, this macrophosphopeptide fraction was not found when casein alone was fed.

3. In the intestinal contents at 2.5 h after ingestion, the amounts of both soluble Ca and phosphorus were significantly higher in rats fed the casein diet than in those fed diets containing egg albumin, isolated soyabean protein or an amino acid mixture. However, the amount of insoluble Ca was least in rats fed the casein diet.

Type
Papers on General Nutrition
Information
British Journal of Nutrition , Volume 43 , Issue 3 , May 1980 , pp. 457 - 467
Copyright
Copyright © The Nutrition Society 1980

References

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