These biological activities are correlated with the antioxidative potential these secondary metabolites. In this study, we proved that the antioxidant activity of red and yellow strawberry guava varied in a does-dependent manner (Figure 1). At low concentrations (1µg/mL), its activity was comparable to that of Trolox and only red strawberry guava displayed a significant difference with Trolox. A strong antioxidant effect was verified at concentrations of 5 and 10 µg/mL. The values of TEAC obtained were 156 and 177 µM/g for red and yellow strawberry guava, respectively. Gonçalves (2008) reported the TEAC of several Brazilian native fruits, including straqberry guava fruit, ranging from 82 to 790 µM/g. Our findings are within this range and also are similar to the strawberry guava (159 µM/g).