Fig. 2

FRAP (a) and ABTS radical scavenging activity (b) of chitooligosaccharides (COSs) from squid pen prepared using pepsin or amylase or lipase for diffeent hydrolysis times. Bars represent the standard deviation (n = 3). Enzymes at 8% (w/w) were used. Different lowercase letters on the bars indicate significant difference (p < 0.05)