A new phenanthrenequinone from Dendrobium draconis
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.
Keywords: Dendrobium draconis; NMR; free radical scavenging; phenanthrenequinone
Document Type: Research Article
Affiliations: Department of Pharmacognosy and Pharmaceutical Botany, Faculty of Pharmaceutical Sciences, Chulalongkorn University, Bangkok, Thailand
Publication date: 01 March 2011
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