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Abstract
The chloroform extract of steams of Dioclea lasiophylla furnished a new compound, namely, 3β-E-feruloyl oleanolic acid, in addition to 3β-E-caffeoyl oleanolic, betulinic and oleanolic acids, vanillin, methyl vanillate, pinoresinol and syringaresinol. The hexane extract contains sitosterol, stigmasterol, acetyl oleanolic acid, lupeol and lupenone. Antioxidant activities of isolates were measured using the 1,2-diphenyl-2-picryl-hydrazyl (DPPH) free radical scavenging assay and the auto-oxidation of β-carotene in a linolenic acid suspension method. The 3β-E-caffeoyl-oleanolic acid, syringaresinol and the new compound, 3β-feruloyl oleanolic acid, exhibited antioxidant activities in both tests.