The antioxidant activity of the hydroalcoholic extract of leaves of bardana (EEB), the ethyl acetate (ACE) and hexane (HEX) fractions were evaluated by in vitro assays. The EEB and fractions inhibited the lipid peroxidation in rat brain homogenate, with IC50 of 0.136 ± 0.015; 0.218 ± 0.049 and 0.628 ± 0.092 mg/mL for BEE, EAC and HEX respectively. The EEB, ACE and HEX presented DPPH radical scavenging-activity, with IC50 of 0.029 ± 0.006; 0.089 ± 0.003 and 0.837 ± 0.160 mg/mL respectively. The total antioxidant capacity of the EEB was significantly (p<0.001) higher than the fractions, being 267.20; 55.49 and 50.02 mM of ascorbic acid, respectively for EED, ACE and HEX. The ethanol extract presented 7.88 ± 0.25 % (w/w) of phenolic compounds that was significantly (p<0.001) different from the ACE and HEX fractions. The results indicate that the analyzed extracts present antioxidant activity, and the EEB was the most efficient. This is the first report on the antioxidant activity of bardana leaves.
Arctium lappa; Asteraceae; antioxidant; TBARS; DPPH