Abstract
Patin sarcoplasmic protein was hydrolysed with Alcalase and papain. The antioxidant activities of sarcoplasmic protein hydrolysates (SPHs) were assessed by evaluating 1,1-diphenyl-2-picrylhydrazyl (DPPH) and 2,2'-azino-bis (3-ethylbenzothiazoline-6-sulphonic acid) diammonium salt (ABTS) radical-scavenging activities, reducing power and metal chelating activity. The Alcalase hydrolysate was purified by ultrafiltration, ion exchange and gel filtration chromatography and RP-HPLC. The most potent fraction (SI 3) obtained from RP-HPLC showed DPPH radical-scavenging activity by 1.83 times higher than SPH. Three antioxidant peptide sequences, Asp-Pro-Gln-His-Pro-Val-Met-Pro-Arg, Leu-Val-Val-Asp-Ile-Pro-Ala-Ala-Leu-Gln-His-Ala and Gly-Val-Asp-Asn-Pro-Gly-His-Pro, were identified by HPLC connected to electrospray ionisation-time-of-flight mass spectrometer (ESI-TOF MS/MS). The presence of a hydrophobic amino acid (Val), hydrophilic amino acids (His and Pro) and an acidic amino acid (Asp) in the peptide sequences is believed to contribute to high antioxidant activity of SPH. Hence, antioxidative peptides from patin protein may be produced for development as natural antioxidant ingredients in functional foods.
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