Phenolic Compounds from Monomeria barbata
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A new 9,10-dihydrophenanthrene derivative, monbarbatain E (1), together with 10 known bibenzyl or phenanthrene derivatives, were isolated from the acetone extract of the rhizomes of Monomeria barbata Lindl. The new compound was identified as 4-O-[4″-(5′-hydroxy-3′,3″-dimethoxybibenzyl)]-1,7-dihydroxy-2-methoxy-9,10-dihydrophenanthrene on the basis of extensive spectroscopic investigations (HR-ESI-MS, 1D and 2D NMR). Compounds 1 and 2 were evaluated for their cytotoxic effects, and compounds 2–5 were tested for their antioxidant activities. Compounds 1 and 2 exhibited medium cytotoxic activity against HL-60 and Skov-3 cell lines. Compounds 2–5 showed significant DPPH radical scavenging activities.
Keywords
Monomeria barbata Lindl dihydrophenanthrene phenolic compounds cytotoxic activity DPPH radical scavenging activityNotes
Acknowledgment
This work was supported by the programs from the National Nature Science Foundation of China (Nos. 20964005, 81160393, and 21002084) and a grant from the Nature Science Foundation of Yunnan Province (No. 2010CD017).
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