Antioxidant Constituents from Leonurus japonicus

초록

phenolic acids, gallic acid (1) and syringic acid (2), and five flavonoids, apigenin (3), luteolin (4),kaempferol (5), quercetin (6), and myricetin (7), were isolated from the aerial parts of Leonurus japonicus. Theirstructures were elucidated by chemical and spectral analysis. The antioxidant activities of the crude extracts,partitioned fractions and isolated compounds were evaluated by DDPH fre radical-scavenging assay. Resultssuggested that the EtOAc partitioned fraction and compounds 1, 4, 5, 6, and 7 showed significantly highα-tocopherol and BHT, which were used as controls.KeywordsAerial parts, antioxidant, constituents, Leonurus japonicus

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