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Table 2 Total amino acid compositions of red blood cell (RBC) and its hydrolysate (RBCH)

From: Bioconversion of duck blood cell: process optimization of hydrolytic conditions and peptide hydrolysate characterization

Item RBC RBCH Chemical score of RBCH
RP-11 RP-22 RP-1 RP-2
Amino acids (g/100 g)
Histidine 4.98 5.25 1.90 1.60 2.76 3.28
Isoleucine 0.32 0.34 2.80 1.30 0.12 0.26
Leucine 9.31 9.82 6.60 1.90 1.49 5.17
Lysine 6.00 6.31 5.80 1.60 1.09 3.94
Methionine 1.01 1.02 2.523 1.703 0.71 1.06
Phenylalanine 4.93 5.17 6.334 1.904 1.09 3.64
Threonine 2.74 2.83 3.40 0.90 0.83 3.15
Valine 5.84 6.10 3.50 1.30 1.74 4.69
Arginine 2.80 2.94     
Tyrosine 1.64 1.74     
Proline 2.30 2.47     
Alanine 5.58 5.87     
Aspartic acid 7.90 8.30     
Cystine 0.71 0.78     
Glutamic acid 6.32 6.62     
Glycine 3.12 3.29     
Serine 3.02 3.18     
  1. 1Essential amino acids for children (2–5 years old) according to FAO/WHO (1985)
  2. 2Essential amino acid for adults according to FAO/WHO (1985)
  3. 3Methionine + cystine
  4. 4Phenylalanine + tyrosine