Table 2. ABTS⁺ radical scavenging activity of tuna byproducts with different proteases

Hydrolysates	RC50 (μg/mL)1)	TEAC (μg TE/mg)2)
No enzyme	180.97±2.78e3)	31.13±0.43d
Alcalase	83.70±0.77b	66.05±0.34a
Bromelain	88.43±1.01c	62.85±1.11b
Flavourzyme	77.29±0.40a	65.77±0.14a
Neutrase	89.57±1.30c	63.26±0.25b
Papain	155.96±2.73d	33.91±0.02c
Trolox	6.36±0.12

Concentration required for 50% reduction of ABTS^+․ at 1 min after starting the reaction.
Trolox equivalent antioxidant capacity.
Each value is mean±SD (n≥3). Different superscripts (a-e) in the same column are significantly different at p<0.05 by Duncan’s multiple range test.