Antioxidant activity of bigeye tuna (Thunnus obesus) head protein hydrolysate prepared with Alcalase |
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Authors: | Ping Yang Hongqiao Ke Pengzhi Hong Shaokui Zeng Wenhong Cao |
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Affiliation: | College of Food Science and Technology, Guangdong Ocean University, Zhanjiang 524025, China |
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Abstract: | The antioxidant activities of tuna head protein hydrolysate (THPH) prepared with Alcalase were evaluated. THPH showed evident radical scavenging activity in a dose‐dependent manner with the IC50 values for 1,1‐diphenyl‐2‐pycrylhydrazyl (DPPH), superoxide and hydroxyl radicals being 1.34, 1.20 and 2.84 mg mL?1, respectively, and its reducing power was 0.948 at 12.5 mg mL?1. THPH showed good inhibitory activity in soybean oil peroxidation after accelerated oxidation at 60 °C, and the oils with 0.01%, 0.05% and 0.1% THPH had significantly (P < 0.05) lower peroxide values than the control, after storage at 60 °C. Moreover, the inhibited oxidation effect of 0.1% THPH was similar to that of 0.01% butylated hydroxytoluene (BHT). The molecular weight distribution of THPH revealed that 70.5% of the total amount was peptides with molecular weight lower than 5000 Da, composing mostly of low molecular weight peptides located at 1020–2585 Da (30.78%) and 241–1020 Da (37.15%). |
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Keywords: | Free radical scavenging activity hydrolysate lipid peroxidation molecular weight distribution tuna head |
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