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Bioactive Liza aurata protein hydrolysates (LAPHs) were prepared by treatment with Trypsine (PH-TR), Esperase (PH-ES), enzyme preparations from Pseudomonas aeruginosa A2 (PH-A2), Bacillus subtilis A26 (PH-A26) and Liza aurata (PH-LA). Their functional properties and antioxidant activities were evaluated. The hydrolysates had degree of hydrolysis (DH) values ranging from 8.15 % to 13.05 %. Reverse-phase HPLC analyses of the LAPHs showed considerable variation in peptide composition. All hydrolysates had high protein content (83.14 %-86.43 %). Glutamic acid, Glutamine (Glx) and Lysine (Lys) were the most abundant amino acids. All protein hydrolysates had a good solubility emulsifying and foam properties were found to be considerably improved by enzymatic hydrolysis. In addition, all hydrolysates showed varying degrees of antioxidant activities evaluated by various in vitro tests. Further, all LAPHs did not show hemolytic activity towards human erythrocytes. The results thus revealed that protein hydrolysates from golden grey mullet could be used as food additives possessing both antioxidant activity and functional properties.

journal of food science and technology/journal of food science and technology

In-vitro antioxidant and functional properties of protein hydrolysates from golden grey mullet prepared by commercial, microbial and visceral proteases