Fig. 1.

DPPH radical scavenging activity (a), FRAP (b) and ferrous ion chelating activity (c) of gelatin hydrolysates from seabass skin prepared using different processes. Bars represent the mean ± standard deviation (n = 3). Different uppercase letters on the bars within the same hydrolysate concentration indicate significant differences (p < 0.05). Different lowercase letters on the bars within the same hydrolysate sample indicate significant differences (p < 0.05), ANOVA followed by Tukey’s. P1-1U and P1-2U represent gelatin hydrolysate produced during gelatin extraction with enzyme concentrations of 1 and 2 units/g dry swollen skin, respectively. P2-1U and P2-2U represent gelatin hydrolysate produced after gelatin extraction with enzyme concentrations of 1 and 2 units/g dry swollen skin, respectively