ANTIOXIDANT ACTIVITY OF ANTHRAQUINONES ISOLATED FROM LEAVES OF MUEHLENBECKIA HASTULATA (J.E. SM.) JOHNST. (POLYGONACEAE)

Abstract

Three anthraquinones, the well known emodin (3) and physcion (6) and the new anthraquinone glycoside emodin-8--D-idopyranoside (7) were isolated from leaves of Muehlenbeckia hastulata. The antioxidant activity of these compounds was measured using the DPPH assay; all three showed weaker antioxidant activity than gallic acid.