Abstract: Phenolic constituents were isolated from Eleocharis tuberosa via extraction with 70% aqueous acetone,purified by various column chromatographies,and identified on the basis of physical and spectral data.A new compound and eight known compounds were isolated,and identified as eleocharinol A (1),1,2′,4′,6′-tetraacetyl-3,6-diferuloylsucrose (2),1,2′,6′-triacetyl-3,6-diferuloylsucrose (3),(+)-syringaresinol (4), trans-ferulic acid (5),caffeic acid (6), p-coumaric acid (7),cinnamic acid (8) and 4-hydroxylbenzoic acid (9).The potential antioxidant activity of the isolated compounds was evaluated using DPPH radical scavenging assay and reducing power assay.Compounds 5 and 6 showed strong antioxidant activities.To our knowledge,all the compounds were isolated from the peels of E.tuberosa for the first time and compound 1 is a new compound.

Key words: Eleocharis tuberosa peels, phenolic constituents, antioxidant activity