Summary
For supplementary weaning foods, Faffa (Ethiopia), Incaparina (Guatemala), Superamin (Egypt) and Sekmama (Turkey), were studied with regard to protein quality. Three different methods for protein quality evaluation were used.
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1.
Chemical analysis of the essential amino acid content. Amino acid scoring of the results indicated that the sulphur-containing amino acids were limiting in Faffa (77%); lysine, threonine and isoleucine in Incaparina (77–75%); threonine in Superamin (80%) and threonine and the sulphurcontaining amino acids in Sekmama (90%).
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2.
Standardized nitrogen balance procedure using laboratory rats. The net protein utilization of the four weaning foods were all in the range 56–70%. Methionine supplementation (1 g/100 g protein) did not significantly improve the biological value of the test diets, but resulted in marked decreased levels of blood urea nitrogen (except for Incaparina), and decreased urinary excretion of urea nitrogen compared to total nitrogen excretion (except for Superamin).
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3.
Single meal plasma amino acid responses in healthy young adults. The responses of the essential amino acids after test meals with the four weaning foods were all within a range considered to indicate a well balanced supply of dietary amino acids, except for marginal deficits of methionine after the Faffa test meals, and isoleucine after the Incaparina test meals.
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Ljungqvist, B. G.: Plasma amino acid response to single test meals in humans. I. A background review. Res. Exp. Med. (Berl.)174, 1 (1978)
Ljungqvist, B. G., Svanberg, U. S.-O., Young, U. R.: Plasma amino acid response to single test meals in humans. II. Healthy young adults given synthetic amino acid mixtures. Res. Exp. Med. (Berl.)174, 13 (1978)
Ljungqvist, B. G., Olsson, M. E., Svanberg, U. S.-O.: Plasma amino acid response to single test meals in humans. III. Supplementary effect of dried skim milk and L-methionine on a vegetable protein mixture. Res. Exp. Med. (Berl.)174, 29 (1978)
Energy and Protein Requirements. Report from a Joint FAO/WHO Ad Hoc Expert Committee, World Health Organization Technical Report Series No.522, WHO, Geneva 1973
Sjöberg, L. B., Boström, S. L.: Studies in rats on the nutritional value of hydrogen peroxidetreated fish protein and the utilization of oxidized sulphur amino acids. Br. J. Nutr.38, 189 (1977)
Conway, H. F., Lancaster, E. B., Bockwalter, G. N.: How extrusion cooking varies product properties. Food Eng.40, 102 (1968)
Moore, S.: On the determination of cystine as cysteic acid. J. Biol. Chem.238, 235 (1963)
Matheson, N. A.: The determination of tryptophan in purified proteins and feeding-stuffs. Br. J. Nutr.31, 393 (1974)
Graham, G. G., Placko, R. P.: Postprandial plasma free methionine as an indicator of dietary methionine adequacy in the human infant. J. Nutr.103, 1347 (1973)
Longenecker, J. B., Hause, N. L.: Relationship between plasma amino acids and composition of the ingested protein. II. A shortened procedure to determine plasma amino acid (PAA) ratios. Amer. J. Clin. Nutr.9, 356 (1961)
Ågren, G., Eklund, A.: Biological and toxicological feeding studies on FAFFA, an Ethiopian protein-rich food for children. Ethiopian Med. J.11, 205 (1973)
Payne, P. R.: Protein quality of diets, chemical scores and amino acid imbalances. In: Protein and amino acid functions, E. J. Bigwood (ed.), p. 259. Oxford: Pergamon Press 1972
Eggum, B. O.: The level of blood amino acids and blood urea as indicators of protein quality. In: Proteins in human nutrition, Porter, J. W. G., Rolls, B. A. (eds.), p. 317. London: Academic Press 1973
Kiriyama, S.: Biological quality of dietary protein and urinary nitrogen metabolites. In: Newer methods of nutritional biochemistry, Albanese, A. A. (ed.), Vol. IV, p. 37. New York: Academic Press 1970
Sanchez, A., Swendseid, M. E.: Amino acid levels and enzyme activity in tissues of rats force-fed diets differing in methionine content. J. Nutr.99, 145 (1969)
PAG: Guideline on protein food mixtures for older infants and young children. PAG, United Nations, New York, N.Y., U.S.A. PAG Guideline No.8 (1970)
Whistler, R. L., Pachall, E. F.: Starch: Chemistry and technology, Vol. I and II. New York: Academic Press 1967
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Supported by grants from the Swedish Medical Research Council (No. K75-03X-3139-04A and No. B76-03X-3139-05B) and the Swedish Nutrition Foundation
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Ljungqvist, B.G., Boström, S.L., Sjöberg, L.B. et al. Plasma amino acid response to single test meals in humans. Res. Exp. Med. 174, 111–119 (1979). https://doi.org/10.1007/BF01851323
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DOI: https://doi.org/10.1007/BF01851323