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Percentage of radical scavenging capacity for OESA. Aliquots of various concentrations of OESA extracts (0, 0.125, 0.25, 0.5, 1 mg/mL) and standard BHT were mixed with DPPH and incubated in the dark. The antioxidant activity of OESA was measured using a spectrophotometer at 517 nm. Results were expressed as mean inhibition percentage (%) ± standard deviations (n = 3). BHT was used as the reference standard.
