Antioxidant activity and flavonoid glycoside from Allium schoenoprasum L. bulbs

Abstract

From Allium schoenoprasum L. (A. schoenoprasum) bulbs cultivated in Quang Tri Province, a flavonoid glycoside, quercetin 3-O-β-D-glucopyranoside (1), was isolated. The structure of this compound was characterized on the basis of IR and NMR spectroscopic techniques. Furthermore, in vitro assays such as DPPH (2,2-diphenyl-1-picrylhydrazyl) radical scavenging were employed for the determination of the antioxidant activities of the extracts. The results showed that the ethyl acetate and methanol extracts from A. schoenoprasum exhibited antioxidant activity with IC₅₀ values of 119.66 and 473.35 µg/mL, respectively.