Abstract
Two new naphthalene diglucosides named nepenthosides A (1) and B (2), together with eleven known compounds (3–13), were isolated from the carnivorous plant Nepenthes mirabilis. The structures of these compounds were elucidated based on extensive spectroscopic analysis, including 1D- and 2D-NMR, and MS. The antioxidant activities of compounds 1–13 were evaluated in terms of their peroxyl radical-scavenging (trolox equivalent, TE) and reducing capacities. All isolates showed peroxyl radical-scavenging and reducing activities at concentrations of 1.0 and 10.0 μM. Anti-osteoporotic activities were investigated using murine osteoclastic RAW 264.7 cells. Compounds 1–7 and 9–12 significantly suppressed tartrate-resistant acid phosphatase activity down to 91.13 ± 1.18 to 42.39 ± 1.11 %, relative to the control (100 %) in nuclear factor-κB ligand (RANκL)-induced osteoclastic RAW 264.7 macrophage cells.
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Acknowledgments
This work was financially supported by Vietnam National Foundation for Science & Technology Development (No. 104.01–2012.59) and the Priority Research Center Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science, and Technology (2009–0093815), Republic of Korea. The authors are grateful to the Institute of Chemistry, VAST for the provision of the spectroscopic instrument.
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Nguyen Van Thanh and Nguyen Phuong Thao have contributed equally to this work.
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Thanh, N.V., Thao, N.P., Dat, L.D. et al. Two new naphthalene glucosides and other bioactive compounds from the carnivorous plant Nepenthes mirabilis . Arch. Pharm. Res. 38, 1774–1782 (2015). https://doi.org/10.1007/s12272-015-0576-9
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DOI: https://doi.org/10.1007/s12272-015-0576-9