A volume of 1.5 ml of each solution was added to 1.5 ml of a methanol DPPH• solution (0.2 mmol/l). The absorbance (A) was
measured at 515 nm after 30 min at 25 ◦C. The blank control consists of 1.5 ml of methanol DPPH• solution mixed with 1.5 ml of methanol without the extract. The radical-scavenging activity of each solution is calculated as the inhibition percentage using