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S-carboxyethylcysteine (a constituent of Acacia seed) negatively affects casein protein utilization by rats


Falade, MS and Adewusi, SRA and Harwood, CE, S-carboxyethylcysteine (a constituent of Acacia seed) negatively affects casein protein utilization by rats, Nutrition, 28, (7-8) pp. 785-792. ISSN 0899-9007 (2012) [Refereed Article]


Copyright Statement

Copyright 2012 Elsevier Inc.

DOI: doi:10.1016/j.nut.2011.10.004


Objective: Two rat bioassay experiments are reported. The first investigated the first limiting amino acid in Acacia colei and the second experiment investigated the effect of S-carboxyethylcysteine (CEC; a compound present in acacia seed) on protein use.

Methods: In the first experiment, Wistar rats were fed A. colei seed supplemented with three levels of methionine, cysteine, and tryptophan (0.1%, 0.2%, and 0.4%). In the second experiment, the Wistar rats were fed CEC-incorporated casein diets.

Results: Supplementation of A. colei with tryptophan had no significant effect on the protein efficiency ratio, cysteine showed the highest protein efficiency ratio value at the 0.4% level, and the protein efficiency ratio increased significantly with the increase in methionine content, making methionine the first limiting amino acid. The methionine-induced growth rate was suppressed by the incorporation of CEC, which also had a negative effect on the plasma amino acid levels.

Conclusion: The results indicated that methionine is the first limiting amino acid in A. colei and that CEC could affect the seedís protein use. Acacia colei seed can be used effectively as famine food only if it is complemented with other cereals known to be rich in sulfur amino acids.

Item Details

Item Type:Refereed Article
Keywords:Acacia colei, amino acid interactions, limiting amino acid, protein use, S-carboxyethylcysteine
Research Division:Biomedical and Clinical Sciences
Research Group:Nutrition and dietetics
Research Field:Nutrigenomics and personalised nutrition
Objective Division:Health
Objective Group:Public health (excl. specific population health)
Objective Field:Food safety
UTAS Author:Harwood, CE (Mr Christopher Harwood)
ID Code:116481
Year Published:2012
Web of Science® Times Cited:4
Deposited By:Plant Science
Deposited On:2017-05-10
Last Modified:2017-09-04
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