Table 4. Amino acid composition of scales, skin, and muscles collagen of sardine.
| Amino acid | Scales (%) | Skin (%) | Muscles (%) |
|---|---|---|---|
| Hydroxyproline | 4.4 | 5.2 | 5.8 |
| Aspartic acid | 1.0 | 3.2 | 6.1 |
| Threonine | 5.4 | 3.1 | 6.6 |
| Serine | 4.2 | 4.6 | 5.2 |
| Glutamic acid | 9.7 | 10.1 | 10.1 |
| Proline | 6.1 | 6.1 | 6.1 |
| Glycine | 19.1 | 19.3 | 20.4 |
| Alanine | 1.4 | 1.8 | 2.0 |
| Valine | 3.7 | 3.7 | 5.2 |
| Methionine | 1.1 | 1.1 | 0.6 |
| Isoleucine | 1.4 | 1.6 | 1.7 |
| Leucine | 4.4 | 4.4 | 5.4 |
| Tyrosine | 3.4 | 4.4 | 4.6 |
| Phenylalanine | 0.3 | 0.5 | 1.0 |
| Lysine | 2.0 | 3.4 | 4.1 |
| Histidine | 3.0 | 3.3 | 3.5 |
| Arginine | 9.0 | 9.0 | 9.0 |
| Total | 100 | 100 | 100 |
| Amino acids | 12.4 | 12.6 | 12.8 |