Phytochemical Constituents from the Rhizomes of Osmunda japonica Thunb and Their Anti-oxidant Activity

Eleven compounds (1–11) were isolated from the rhizomes of Osmunda japonica, and their structures were elucidated based on 1H, 13C-NMR and LC-IT-TOF MS data. Of these compounds, all compounds (1 – 11) have been previously reported, although five (6 – 9, 11) have not previously been isolated from this plant. The antioxidant activities of isolated compounds (1 – 11) were measured by DPPH and ABTS assays, and compound 10 showed the high antioxidant activity.

Chemical constituents of sterile fronds of Osmunda japonica / 中国药学杂志

OBJECTIVE: To study the chemical constituents of the sterile fronds of Osmunda japonica. METHODS: The 95% ethanol extract of the sterile fronds of Osmunda japonica was partitioned with. Eight compounds were isolated by column chromatography from ethyl acetate part, and their structures were identified by analysis of NMR and MS data. RESULTS: The compounds were identified as; (+)-dehydrovomifoliol (1), p-hydroxybenzylideneacetone (2), 3′, 4′-dihydroxybenzylideneacetone (3), protocatechuicaldehyde (4), protocatechuic acid (5), p-hydroxy-benzaldehyde(6), 15-nonacosanone (7), and β-sitosterol (8). CONCLUSION: Compounds 1, 2, 4, 6, and 7 were obtained from the genus Osmunda for the first time.