Cereal Chem 44:638 - 644.  |  VIEW ARTICLE
Correlation of Amino Acid Indexes with Nutritional Quality of Several Soybean Fractions.

L. R. Hackler, B. R. Stillings, and R. J. Polimeni, Jr. Copyright 1967 by the American Association of Cereal Chemists, Inc. 

Amino acid compositional studies were made on several soybean fractions. An essential amino acid index and a requirement index were calculated, based on the amino acids of the soybean fractions, and the results failed to demonstrate a good correlation between the chemical indexes and protein efficiency ratio (PER) values. Available lysine was determined for the fractions, and it also failed to correlate with PER. The residue, which is the most nutritious fraction as measured by growth and PER, contained more cystine and consequently more total sulfur amino acids. This apparently accounts for the superior utilization of the residue protein.