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IC50 values of (A) DPPH free-radical scavenging and (B) ferrous ion-chelating activity of CoTE and its soluble fractions. Mean ± SE (n = 3). Different letters (a–d) in the figure are significantly different at the level of p < 0.05 according to Scheffe's test. EASF = ethyl acetate soluble fraction, BSF = n-butanol soluble fraction, WSF = water soluble fraction. (A) IC50 value of quercetin was 4.0 μg/mL (B) IC50 value of EDTA-Na2 was 9.3 μg/mL.
