Investigation of the composition and antioxidant activity of acetone and methanol extracts of L. and L.

The compositions of methanol and acetone extracts obtained from L. and L. were investigated. The antioxidant activities of each extract were determined by various test methods. Phenolic composition profile analysis by HPLC-DAD showed that extracts contain more phenolic compounds than extracts. Among the components, syringic acid was found to be the most abundant one in extracts (42.8 and 38.4 mg per g dry extract of methanol and acetone, respectively). Total flavonoid, total phenolic and total carotenoid contents of methanolic extracts were found to be 244.5 mg rutin/g dry weight of extract, 1219.3 mg GAE/g dry weight of extract and 11.9 mg/g dry weight of extract, respectively. DPPH, ABTS and O assays were applied to plant extracts as radical scavenging activity tests. Methanolic extracts of . and . showed the highest radical scavenging activities according to DPPH and ABTS tests (61.6 and 147.2 in terms of IC, respectively). Antioxidant activity tests for measuring lipid oxidation inhibiting capacity were carried in low density lipoprotein (LDL) and bovine brain extract (BBE). Methanolic extracts of and demonstrated remarkable lipid oxidation inhibiting capacity in LDL and BBE tests.