Abstract
The total protein and amino acid contents of three new northern adapted soybean cultivars, namely Apache, Baron, and a miso type Maple Belle and its older male recurrent parent Evans, were compared as potentially useful indices for assessing their protein quality from their FAO/WHO amino acid scoring pattern. The total protein contents, although similar, were statistically significantly different (P > 0.05), varying from 30.1% in Baron to 31.2% in Evans, 32.3% in Apache, and 31.5% in Maple Belle. All four soybean cultivars contained an excellent balance of essential amino acids (EAA), i.e., EAA9 = 46−46.6% compared to the FAO/WHO reference protein pattern value of 33.9% for a 2−5-year-old child. All were limited only in methionine, and to a lesser extent in isoleucine and valine, and had a protein digestibility corrected amino acid score of 91% compared to the values obtained for hen's whole egg (97%). These results indicate that an accurate calculation of protein quality of soybean seeds and other legumes can be made from their amino acid composition. Keywords: Soybeans; miso type soybean; assessment; protein quality; amino acids; composition; amino acid score
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