Assessment of Antioxidant Activities, Total Phenolics, and Flavonoids of Different Extracts of Strobilanthes Schomburgkii Leaves

Abstract

The main purpose of this work was to assess the antioxidant activities of the n-hexane, ethyl acetate and methanol extracts of Strobilanthes schomburgkii leaves collected in Laocai province, Vietnam. Total phenolic and flavonoid contents were determined. The DPPH, H₂O₂ radical scavenging activity, and total antioxidant activity via phosphomolybdenum method were investigated. The results showed that the methanol extract concluded a high concentration of phenolics and flavonoids which were 65.42 mg/g and 52.05 mg/g, respectively. There was a significant correlation between total phenolic and flavonoid concentrations and EC₅₀ values of different antioxidant assays. The antioxidant properties of the different extracts from Strobilanthes schomburgkii leaves were reported for the first time.