Table 1. Amino Acid Composition of Fish Protein Hydrolysates (mg/g Protein/Powder) Generated from Different Fish Species Following Hydrolysis Using Alcalase (A) and Flavourzyme 500L (F)a.
| red
salmon (Oncorhynchus nerka) hydrolysates (mg/g protein)167 |
herring
(Clupea harengus) byproduct hydrolysates (mg/g protein)24 |
yellow
stripe trevally (Selaroides leptolepis) protein hydrolysates
(mg/g powder)168 |
brown
stripe red snapper (Lutjanus vitta) muscle protein
hydrolysates (mg/g powder)20 |
|||||||
|---|---|---|---|---|---|---|---|---|---|---|
| amino acid | blue whiting protein hydrolysates (mg/g powder)163 | A | F | HBH | HHH | blue whiting protein hydrolysates (mg amino acid/g powder)86 | A | F | A | F |
| aspartic acid | 85.6 | 88.3 | 87.7 | 93.8 | 89.2 | 64.2 | 95.5 | 94.0 | 106.5 | 107.3 |
| threonine | 37 | 41.9 | 42.1 | 39.3 | 40.4 | 25.9 | 51.0 | 49.1 | ||
| serine | 41.0 | 46.1 | 46.2 | 41.1 | 45.3 | 25.5 | 53.5 | 54.0 | 51.5 | 50.2 |
| glutamic acid | 125.0 | 135.1 | 134.9 | 163.4 | 145.1 | 94.1 | 137.7 | 138.9 | 162.3 | 169.2 |
| proline | 34.1 | 65.0 | 66.8 | 41.0 | 58.9 | 20.2 | 38.1 | 38.4 | 36.6 | 34.6 |
| glycine | 55.2 | 97.6 | 102.9 | 69.8 | 95.0 | 27.8 | 88.7 | 86.5 | 74.8 | 72.1 |
| alanine | 54.1 | 68.4 | 68.8 | 70.1 | 69.4 | 38.4 | 94.9 | 94.6 | 93.8 | 95.6 |
| valine | 38.9 | 50.1 | 45.2 | 44.7 | 45.7 | 27.8 | 36.1 | 33.8 | 51.5 | 51.5 |
| methionine | 19.4 | 28.8 | 29.4 | 33.3 | 33.1 | 18.2 | 25.8 | 18.7 | 29.3 | 29.2 |
| isoleucine | 33.5 | 37.1 | 36.6 | 33.2 | 32.6 | 27.4 | 41.4 | 44.9 | 41.4 | 40.7 |
| leucine | 57.8 | 66.9 | 66.5 | 78.8 | 71.2 | 48.0 | 83.8 | 85.8 | 85.4 | 86.2 |
| tyrosine | 32.3 | 32.5 | 30.9 | 26.3 | 27.4 | 18.7 | 57.0 | 61.1 | 23.3 | 21.4 |
| phenylalanine | 28.7 | 40.7 | 39.7 | 34.9 | 37.2 | 23.1 | 26.1 | 26.6 | 26.5 | 24.5 |
| histidine | 15.3 | 23.8 | 23.0 | 26.0 | 18.9 | 8.6 | 36.2 | 29.8 | 17.1 | 16.0 |
| hydroxyproline | 23.5 | 25.6 | 0.0 | |||||||
| lysine | 74.4 | 73.9 | 72.5 | 106.6 | 80.4 | 53.9 | 83.5 | 87.2 | 95.1 | 97.6 |
| arginine | 59.4 | 67.7 | 69.2 | 70.5 | 73.0 | 40.7 | 35.0 | 38.8 | 50.0 | 50.6 |
| tryptophan | 6.5 | 0.0 | 2.8 | 2.9 | ||||||
| cysteine | 6.1 | 11.2 | 11.1 | 6.5 | 14.7 | 15.3 | 1.2 | 1.4 | ||
a
HBH = herring body (only head and gonads were removed) hydrolysates (generated with Alcalase); HHH = herring head hydrolysates (generated with Alcalase)