Abstract

In this study ferric reducing antioxidant power assay, 2,2-diphenyl-1-picrylhydrazyl and oxygen radical absorbance capacity assays were employed to measure the antioxidant activity of flower and leaf extracts of Ferulago angulata. Ferric reducing antioxidant power assay of the extracts showed that the antioxidant activities of leaf extracts were higher than that of flower extracts. 2,2-diphenyl-1-picrylhydrazyl values showed similar trend to ferric reducing antioxidant power assay. A slow kinetic behavior was found within methanol extracts of both plant parts (EC50 of 0.071 mg/ml and 0.12 mg/ml for leaf methanol extract and flower methanol extract, respectively), estimated by kinetic mode of 2,2-diphenyl-1-picrylhydrazyl assay. The oxygen radical absorbance capacity assay indicated higher values for methanol extracts of plant parts compared to that of ethanol extracts. Except for oxygen radical absorbance capacity assay, a significant positive correlation was found between ferric reducing antioxidant power, 2,2-diphenyl-1-picrylhydrazyl and Folin-Ciocalteu assays, suggesting that phenolic compounds have an important role in reducing power and antiradical properties of the extracts.