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Protein utilization in rats receiving a low-protein diet with various limiting amino acids

Published online by Cambridge University Press:  24 July 2007

H. Rafalski ,
E. JabŁOŃski  and
Teresa Switoniak
H. Rafalski
Affiliation:
Department of Human Nutrition, Institute for Social Medicine of the Lodz Medical Academy, 90-402 Lodz, ul.Zachodnia 81/83, Poland
E. JabŁOŃski
Affiliation:
Department of Human Nutrition, Institute for Social Medicine of the Lodz Medical Academy, 90-402 Lodz, ul.Zachodnia 81/83, Poland
Teresa Switoniak
Affiliation:
Department of Human Nutrition, Institute for Social Medicine of the Lodz Medical Academy, 90-402 Lodz, ul.Zachodnia 81/83, Poland
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Abstract

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1. A study was made of protein utilization in rats given a variety of low-protein diets containing (g/kg) egg albumin 18, casein 49, gluten 50, or mixtures of either maize protein and gelatine 58, or casein and gelatin 37, each with supplemental methionine. The diets were limiting in leucine, tryptophan or lysine, or in both tryptophan and the sulphur-containing amino acids.

2. Values obtained for net protein utilization (npu) at these low levels of nitrogen intake were markedly higher than the amino acid score calculated for the different test proteins, except with casein for which the two values were similar. The npu values agreed more closely with chemical score values based on the content of S-amino acids or isoleucine in the dietary protein.

Type
Papers on General Nutrition
Information
British Journal of Nutrition , Volume 39 , Issue 1 , January 1978 , pp. 13 - 18
Copyright
Copyright © The Nutrition Society 1978

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