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Table 3 Amino acid compositions of protein sources

From: Leucine content of dietary proteins is a determinant of postprandial skeletal muscle protein synthesis in adult rats

Amino Acid Vital Wheat Gluten1 Soy Protein Isolate2g/100 g Protein Egg White Solids3 Whey Protein Isolate4
Alanine 3.1 4.0 6.1 4.9
Arginine 4.7 7.5 5.8 2.4
Aspartate 4.0 11.5 10.3 10.6
Cysteine 1.9 1.3 4.4 2.5
Glutamate + Glutamine 31.7 19.2 13.1 16.9
Glycine 3.8 4.1 3.5 1.8
Histidine 1.8 2.5 2.3 2.0
Isoleucine 3.0 4.8 5.3 6.2
Leucine 6.8 8.0 8.8 10.9
Lysine5 2.8 (+6.3) 6.3 6.5 9.1
Methionine 1.9 1.3 3.8 2.0
Phenylalanine 4.4 5.2 5.9 3.3
Proline 9.4 5.2 3.8 5.6
Serine 3.9 5.4 6.9 4.7
Threonine 2.6 3.8 4.5 6.4
Tryptophan 1.3 1.2 1.6 1.7
Tyrosine 2.4 4.8 4.0 3.0
Valine 4.5 4.7 6.8 6.0
  1. 1Vital Wheat Gluten purchased from Honeyville Grain, Honeyville, UT. 83.4% protein, 7.6% carbohydrate, 9% other (w/w).
  2. 2Soy Protein Isolate provided by Archer Daniels Midland Company, Decatur, IL. 91.6% protein, 1.4% carbohydrate, 7% other.
  3. 3Egg White Solids purchased from Harlan-Teklad, Madison, WI. 87.8% Protein, 4.5% carbohydrate, 7.7% other.
  4. 4Whey Protein provided by Perham, Perham, MN. 89.9% protein, 3.8% carbohydrate, 6.3% other.
  5. 5Wheat Gluten supplemented with 6.3 g L-lysine/100 g protein to match Whey Protein Isolate.