Table 6.
Amino acid composition of shrinp waste protein hydrolysate prepared at sifferent stages of hydrolysis
| Amino acids | Amount dry basis (% pico mol × 6.25) expressed as percentage of total amino acid composition in samples prepared at different degree of hydrolysis* | |||
|---|---|---|---|---|
| 0 h | 0.5 h | 1 h | 1.5 h | |
| Aspartic acid | 6.4 ± 0.35 | 8.0 ± 0.35 | 8.6 ± 0.05 | 9.00 ± 0.32 |
| Threonine | 1.0 ± 0.04 | 1.2 ± 0.04 | 1.1 ± 0.22 | 1.0 ± 0.22 |
| Serine | 1.8 ± 0.45 | 1.8 ± 0.45 | 2.00 ± 0.45 | 2.0 ± 0.05 |
| Glutamic acid | 9.6 ± 0.02 | 10.5 ± 0.02 | 11.1 ± 0.06 | 11.4 ± 0.04 |
| Proline | 1.7 ± 0.11 | 0.56 ± 0.11 | 0.45 ± 0.01 | 0.40 ± 0.06 |
| Glycine | 11.8 ± 0.03 | 16.4 ± 0.03 | 14.8 ± 0.45 | 14.0 ± 0.08 |
| Alanine | 8.7 ± 0.05 | 4.3 ± 0.05 | 4.2 ± 0.22 | 3.8 ± 0.88 |
| Cystine | 4.6 ± 0.01 | 2.2 ± 0.01 | 2.4 ± 0.05 | 2.5 ± 0.56 |
| Valine | 7.9 ± 0.38 | 9.9 ± 0.38 | 10.0 ± 0.01 | 11.1 ± 0.02 |
| Methionine | 2.5 ± 0.23 | 3.9 ± 0.23 | 3.00 ± 0.08 | 2.1 ± 0.01 |
| Isoleucine + Leucine | 12.3 ± 0.01 | 14.4 ± 0.01 | 15.3 ± 0.05 | 16.2 ± 0.09 |
| Tyrosine | 2.3 ± 0.62 | 1.4 ± 0.62 | 1.4 ± 0.06 | 1.2 ± 0.15 |
| Phenylalanin | 3.0 ± 0.04 | 3.8 ± 0.04 | 3.0 ± 0.55 | 2.4 ± 0.02 |
| Lysine | 15.2 ± 0.01 | 16.8 ± 0.01 | 17.5 ± 0.34 | 18.1 ± 0.06 |
| Histidin | 1.2 ± 0.09 | 2.0 ± 0.09 | 2.4 ± 0.01 | 2.4 ± 0.54 |
| Arginine | 1.2 ± 0.07 | 1.9 ± 0.07 | 1.9 ± 0.48 | 1.1 ± 0.12 |
| Tryptophan | 2.3 ± 0.05 | 1.2 ± 0.05 | 1.3 ± 0.05 | 1.3 ± 0.03 |
| Essential amino acid (EAA) | – | 54.7 ± 0.01 | 55.2 ± 0.01 | 55.9 ± 0.01 |
| Flavour amino acids (FAA) | – | 39.3 ± 0.01 | 38.7 ± 0.01 | 38.3 ± 0.01 |
| Protein efficiency ratio(PER) | – | 2.8 ± 0.06 | 2.8 ± 0.01 | 3.0 ± 0.01 |
| Chemical score | – | 0.87 | 0.97 | 1.05 |
Mean of 3 determinations ± standard deviation.