Fig. 2. Capacity of coffee brew extracts at concentration of (A) 0.5 mg/ml and (B) 1 mg/ml to prevent AAPH-induced oxidative stress determined by DCFH-DA probe in differentiated Caco-2 cells. Data were expressed as% of Inhibition on fluorescence signal. Different letters indicate significant differences (p < 0.05) among different roasted coffee brew extracts from each geographic region.