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Scavenging activity (in percentage) of tuna skin collagen, gelatin, and hydrolysates. Upper figure, 2,2′-azino-bis (3-ethylbenzothiazoline-6-sulphonic acid (ABTS) method; lower figure, 2,2-diphenyl-1-picrylhydrazyl (DPPH) method. The different letters indicate significant differences (p < 0.05).
