Journal
JOURNAL OF ASIAN NATURAL PRODUCTS RESEARCH
Volume 13, Issue 3, Pages 251-255Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/10286020.2010.546354
Keywords
Dendrobium draconis; phenanthrenequinone; NMR; free radical scavenging
Funding
- National Research University
- Ratchadaphiseksomphot Endowment Fund [FW1016A]
- Chulalongkorn University Graduate School
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A number of Dendrobium species (Orchidaceae) have been used as health foods. In Thailand, the tea prepared from the stems of Dendrobium draconis Rchb.f. (Orchidaceae) has been used as a blood tonic. Our phytochemical investigation of this plant led to the isolation of a new compound namely 5-methoxy-7-hydroxy-9,10-dihydro-1,4-phenanthrenequinone (1), along with four known stilbenoids including hircinol (2), gigantol (3), batatasin III (4), and 7-methoxy-9,10-dihydrophenanthrene-2,4,5-triol (5). The structures of these compounds were determined through extensive spectroscopic studies, including 1H and 13C NMR, DEPT, COSY, NOESY, HMQC, HMBC, ESI-MS, and HR-ESI-MS experiments. In the DPPH-free radical assay, these stilbene derivatives showed appreciable antioxidant activity.
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