Abstract:
The fish processing by-products produce large amounts of fish waste such as scales of fish which are rich in collagen. Chemical composition, acid-soluble collagen (ASC) extraction with the microwave-assisted process, and free radical scavenging activity of marine fish scales collagen were investigated. Fish scales of Lates calcarifer, Epinephelus malabaricus and Rachycentron canadum showed the total protein
ranging from 48.13 to 55.05 % and the lowest total lipids ranged between 0.05 and 0.07 %, respectively. Marine fish scales contained total saturated fatty acid (SFAs) ranging from 39.59 to 48.91 %TFA, palmitic acid 16:0 and heptadecanoic acid 17:0 were the dominant SFAs, following monounsaturated fatty acids (MUFAs; 3.10 - 8.99 %TFA), and polyunsaturated fatty acids (PUFAs; 1.09 - 4.62 %TFA). The chemical
structural property of ASC was characterized by Fourier-transform infrared (FTIR) spectroscopy appearing with five spectral intervals absorption of amide A (3281.10 cm-1), amide B (2935.61 cm-1), amide I (1628.22 cm-1), amide II (1547.99 cm-1), and amide III (1237.76 cm-1
), respectively. The amino acid profile of ASC had glycine as the major amino acid followed by proline and alanine, respectively. The SDS-PAGE
pattern showed the typical features of type I collagen. In addition, ASC with the microwave-assisted process showed good scavenging activities on 2,2-diphenyl-1-picrylhydrazyl (DPPH) radicalof L. calcarifer (IC50 12.75 and 14.31 mg/mL, respectively) and 2,2-azino-bis-(3-ethylbenzothiazoline)-6-sulfonic acid (ABTS) radical of R. canadum (IC50 0.38 and 3.11 mg/mL, respectively). Therefore, the ASC of L. calcarifer
and R. canadum can be used as an alternative source of collagen with antioxidantproperties