Effect of amino acid supplementation on protein quality of soy-based infant formulas fed to rats

The powder forms of soy-based infant formulas obtained from four manufacturers were fed to weanling rats for two weeks, as the sole source of protein in diets containing 8% protein, 20% fat, and adequate amounts of minerals and vitamins. The relative protein efficiency ratio (RPER) and the relative...

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Bibliographic Details
Published in:Plant foods for human nutrition (Dordrecht) 1993-05, Vol.43 (3), p.259-266
Main Authors: Sarwar, G. (Health and Welfare Canada, Ottawa, Ont. (Canada)), Peace, R.W, Botting, H.G
Format: Article
Language:English
Subjects:
ACIDE AMINE
ALIMENT POUR NOURRISSON
ALIMENTOS PARA NINOS
AMINO ACIDS
Amino Acids - administration & dosage
Amino Acids - blood
AMINOACIDOS
ANIMAL DE LABORATOIRE
ANIMALES DE LABORATORIO
Animals
Biological and medical sciences
Blood Urea Nitrogen
CALIDAD PROTEICA
COMPLEMENTATION
DIET
DIETA
Dietary Proteins - standards
ENRIQUECIMIENTO DE LOS ALIMENTOS
FOOD ENRICHMENT
Food industries
Food, Fortified
Fundamental and applied biological sciences. Psychology
Glycine max
Humans
Infant
Infant Food
INFANT FOODS
LABORATORY ANIMALS
Nutritive Value
PLANT PROTEIN
PROTEIN QUALITY
PROTEINAS VEGETALES
PROTEINE VEGETALE
QUALITE PROTEIQUE
Rats
Rats, Sprague-Dawley
REGIME ALIMENTAIRE
Research and development. New food products, dietetic foods and beverages
SOJA
SOYBEANS
Weight Gain
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Summary:The powder forms of soy-based infant formulas obtained from four manufacturers were fed to weanling rats for two weeks, as the sole source of protein in diets containing 8% protein, 20% fat, and adequate amounts of minerals and vitamins. The relative protein efficiency ratio (RPER) and the relative net protein ratio (RNPR) values (casein + methionine = 100) of diets containing unsupplemented formulas were 71-81 and 78-85, respectively. Supplementation of the formula diets with lysine (0.2%), methionine (0.2%), threonine (0.1%) or tryptophan (0.05%) increased the level of the supplemental amino acid in rat serum but generally failed to improve the RPER or RNPR values. Addition of all four essential amino acids to the formula diets, however, caused a marked improvement in their protein quality (RPER or RNPR values = 100). The data suggested that proteins in soy-based formulas could be marginally co-limited in several indispensable amino acids.
ISSN:0921-9668
1573-9104
DOI:10.1007/BF01886228