flavonoid contents and free radical scavenging activity of extracts from leaves, stems, rachis and roots of dryopteris erythrosora

the present study was designed to explore the flavonoid contents and the radical scavenging activities of 50% ethanol extracts of leaves, stems, rachis and roots of dryopteris erythrosora. the total flavonoid contents in various parts were determined as: stems > roots > rachis > leaves. all extracts from different parts of d. erythrosora showed strong bioactivities. the dpph free radical scavenging abilities of extracts were determined as: stems > root > rachis >> leaves. this trend is reciprocal proportion to the total flavonoid contents in leaves, stems, rachis and roots of d. erythrosora extracts. the superoxide anion scavenging abilities of ethanol extracts were determined as: stems > leaves > rachis > root. it illustrated that there are strong superoxide anion scavengers in d. erythrosora. it is worth to separate and identify these components in future.