Superoxide anion radical plays an important role in the formation of other reactive oxygen-species
such as hydroxyl radical, hydrogen peroxide, or singlet oxygen in living systems [19], so evaluating
the scavenging effects of D. cambodiana on superoxide radicals is one of the most important ways to
clarify the mechanism of any antioxidant activity. Table 2 shows the superoxide anion radicalscavenging
capacities of the fractions of D. cambodiana stems. All of the tested extracts exhibited
superoxide radical-scavenging effects. Among the fractions, the order of the superoxide anion radicalscavenging
capacities were found to be EAF > BUF > AF > PEF.