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Table 1 Amino acid composition of soy protein isolate and soy peptide (g/100 g protein)

From: Effects of soy protein isolate and soy peptide preload on gastric emptying rate and postprandial glycemic control in healthy humans

  Soy protein isolate Soy peptide
Alanine 3.7 3.3
Arginine 6.7 6.8
Aspartic acid 10.2 10.5
Cysteine 1.1 1.1
Glutamic acid 17.0 18.5
Glycine 3.6 3.5
Histidine a 2.3 2.2
Isoleucine b 4.0 3.2
Leucine b 6.9 5.6
Lysine a 5.5 5.5
Methionine a 1.1 1.0
Phenylalanine a 4.6 3.8
Proline 4.6 4.7
Serine 4.4 4.6
Threonine 3.4 3.2
Tryptophan a 1.2 0.9
Tyrosine 3.4 2.9
Valine b 4.2 3.4
  1. aEssential amino acids
  2. bBranched-chain essential amino acids