抄録
The marine cordgrass Spartina anglica has even been considered as an invasive plant in recent years. But their huge biomass was also useful bio-resource for various bioactive substances. In this paper, the ethanol extracts of S. anglica were screened for their antioxidant activities, and bioactivity-guided isolation by macroreticular resin column chromatography, polyamide column chromatography lead to a potent antioxidant fraction. Finally, with the help of HPLC and NMR techniques, three flavonol glycosides were identified as: 5,4′-dihydroxy-3′-methoxy-flavonol-3-O-glucosyl-(1→6)-glucosyl-7-O-rhamnoside (1), 5-hydroxy-3′,4′-dimethoxy-flavonol-3-O-glucosyl-(1→6)-glucosyl-7-O-rhamnoside (2), 5-hydroxy-3′-methoxy-flavonol-3-O-glucosyl-(1→6)-glucosyl-7-O-rhamnoside (3). Among them, compounds 1 and 3 showed potent antioxidant activities, and 2 and 3 were novel compounds. These compounds may contribute for the antioxidant activities of the Spartina extracts.
