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2,2-diphenyl-1-picrylhydrazyl (DPPH) radical-scavenging capacity of P. angustifolium extracts. EC50 value is the amount/concentration of the sample extract or ascorbic acid necessary to scavenge/reduce the initial DPPH radical concentration by 50% (50% effective concentration). Different letters within individual extract indicate significant differences at α = 0.05.
