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Table 1 Amino acid composition of RIP and the FAO/WHO suggested requirements (2–5 years old) for the essential amino acids (g/100 g of protein)

From: Characterization, evaluation of nutritional parameters of Radix isatidis protein and its antioxidant activity in D-galactose induced ageing mice

Amino acids RIP FAO/WHO suggested requirements (2–5 years old)
Isoleucine 7.36 ± 0.51 2.8
Leucine 3.92 ± 0.24 6.6
Lysine 0.46 ± 0.06 5.8
Cysteine 0.01 ± 0.00  
Methionine 0.11 ± 0.02  
Total sulphur amino acids 0.12 2.5
Tyrosine 0.85 ± 0.06  
Phenylalanine 4.08 ± 0.19  
Total aromatic amino acids 4.93 6.3
Threonine 5.06 ± 0.83 3.4
Tryptophan 2.57 ± 0.44 1.1
Valine 7.62 ± 0.08 3.5
Histidine 1.74 ± 0.04 1.9
Total essential amino acids 33.79 32.8
Arginine 2.95 ± 0.24  
Aspartic acid + asparagine 9.78 ± 0.65  
Glutamic acid + glutamine 6.03 ± 0.42  
Serine 2.36 ± 0.04  
Proline 8.88 ± 0.49  
Glycine 6.03 ± 0.70  
Alanine 2.43 ± 0.21  
Total non-essential amino acids 38.46  
aE/T,% 46.77  
Amino acid score 101.33  
bAntioxidant amino acids 29.63  
  1. a The proportion of essential amino acids to the total amino acids
  2. bAntioxidant amino acids, it contains hydrophobic amino acids (valine, alanine, proline and leucine), aromatic amino acids (tyrosine, histidine, and phenylanine), and methionine [19]