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The ethanol and water extracts of turmeric (Curcuma longa L.) displayed free radical scavenging activity. Chemical investigation of the ethanolic extract led to the isolation of a new acylated luteolin glucoside, luteolin-7-O-(6"-p-hydroxybenzoyl-b-D-glucopyranoside) (compound 1), together with the known flavonoids: luteolin 7-O-b-D-glucopyranoside (compound 2), apigenin-7-O-b-D-glucopyranoside (compound 3), luteolin (compound 4) and apigenin (compound 5) which were isolated for the first time from C. longa L. rhizomes, in addition to three diphenylheptanoids: curcumin (compound 6), demethoxycurcumin (compound 7) and bisdemethoxycurcumin (compound 8). The diphenylheptanoids have been previously reported for C. longa.   Key words: Curcuma longa L., polyphenols constituents, luteolin-7-O-(6"-p-hydroxybenzoyl-b-glucopyranoside).

A new acylated luteolin glycoside from Curcuma Longa L. and free radical scavenging potential of its extracts