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A New Bibenzyl from Dendrobium secundum

Boonchoo Sritularak, Natthacha Duangrak, and Kittisak Likhitwitayawuid*

Department of Pharmacognosy and Pharmaceutical Botany,

Faculty of Pharmaceutical Sciences, Chulalongkorn University, Bangkok 10330, Thailand.

E-mail: Kittisak.L@chula.ac.th

* Author for correspondence and reprint requests

Z. Naturforsch. 66 c, 205 – 208 (2011); received November 8, 2010/January 26, 2011

From the aerial parts of Dendrobium secundum, a new bibenzyl, namely 4,5,4c-trihydroxy- 3,3c-dimethoxybibenzyl, was isolated, along with four known compounds which included brittonin A, moscatilin, syringaresinol, and ferulic acid. All of these isolates showed appreci- able DPPH free radical scavenging potential, except for brittonin A, which was devoid of activity.

Key words: Dendrobium secundum, Bibenzyl, Free Radical Scavenging

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