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Abstract
A new compound, 4-O-caffeoyl-d-glucopyranose (1), and a new natural product, 3-O-caffeoyl-d-glucopyranose (2), together with six known compounds (3–8) were isolated from the aerial parts of Lygodium japonicum. Their structures were elucidated on the basis of extensive spectroscopic data analyses. The oxygen radical absorbance capacity assay was applied to evaluate their antioxidative capacities in vitro, which revealed that 1–8 showed strong antioxidative properties.
Acknowledgements
This work was financially supported by the Fund of National Science and Technology Development (No. 2006BAIO6A20-09). The authors are grateful to Dr Hui-nan Zhao, Dr Ming-yang Liu, and Dr Zhen-qiang Mu, Institute of Traditional Chinese Medicine and Natural Products, Jinan University, for measuring the HR-ESI-MS, ESI-MS, and NMR spectral data.