Antioxidative curcuminoids from rhizomes of Curcuma xanthorrhiza

Abstract A new curcumin analogue has been isolated from the rhizomes of Curcuma xanthorrhiza along with four known curcuminoids, and its structure has been determined as 1-(4-hydroxy-3,5-dimethoxyphenyl)-7-(4-hydroxy-3-methoxyphenyl)-(1 E ,6 E )-1,6-heptadiene-3,4-dione by spectral data. The new compound showed potent antioxidant activity against autoxidation of linoleic acid in a water-alcohol system.