Table 4 Free amino acid contents of peptides prepared by six proteases
Free amino acids | Amino acid contents of peptides prepared by six proteases (%) | |||||
|---|---|---|---|---|---|---|
Neutrase | Papain | Bromelain | Alcalase | Pepsin | Pancreatin | |
Asp | 0.05 | 0.11 | 0.12 | 0.11 | 0.03 | 0.62 |
Thr | 0.07 | 0.12 | 0.63 | 0.21 | 0.01 | 0.94 |
Ser | 0.25 | 0.26 | 1.10 | 0.63 | 0.02 | 0.86 |
Glu | 0.27 | 0.19 | 2.04 | 1.09 | 0.05 | 1.58 |
Pro | ND | 0.02 | 0.07 | ND | ND | ND |
Gly | 0.08 | 0.55 | 0.96 | 0.26 | ND | 0.44 |
Ala | 0.40 | 0.30 | 1.25 | 1.23 | 0.03 | 1.30 |
Val | 0.23 | 0.16 | 0.49 | 0.49 | 0.07 | 1.70 |
Met | 0.04 | 0.06 | 0.61 | 0.39 | 0.01 | 0.22 |
Ile | 0.22 | 0.09 | 0.51 | 0.24 | ND | 1.58 |
Leu | 0.63 | 0.63 | 2.72 | 0.99 | 0.06 | 4.49 |
Tyr | 0.53 | 0.79 | 1.44 | 0.94 | 0.34 | 3.68 |
Phe | 1.79 | 2.09 | 2.83 | 3.42 | 0.74 | 4.40 |
His | 0.16 | 0.18 | 0.48 | 0.32 | 0.07 | 0.72 |
Lys | ND | 0.39 | 1.02 | 1.02 | ND | 1.98 |
Arg | 0.99 | 1.62 | 1.92 | 1.06 | 0.02 | 7.16 |
Total | 6.14 | 7.56 | 18.2 | 12.4 | 1.63 | 31.7 |