Bibenzyl derivatives from the orchid Dendrobium amoenum

In Vitro Propagation by Asymbiotic Seed Germination and 1,1-Diphenyl-2-picrylhydrazyl (DPPH) Radical Scavenging Activity Studies of Tissue Culture Raised Plants of Three Medicinally Important Species of Dendrobium

“…45) Based on this principle, the antioxidant activity of a substance can be expressed as its ability to scavenge the DPPH free radical. The methanolic extracts of Dendrobium species are known to contain a wide variety of potentially useful chemical compounds that include alkaloids, 46) fluorenones and sesquiterpenoids, 47) stilbenoids, 15) alkyl ferulates. 48) Some of these chemical constituents, like stilbenoids, 49) alkyl ferulates, 48) aromatic phenolic compounds 50) are known to possess antioxidant activity.…”

Synthesis and Biological Activity of Isoamoenylin, a Metabolite ofDendrobium amoenum

“…The residue obtained was chromatographed in a silica gel column with petroleum ether: ethyl acetate (90:10) as the eluent to give 6 (500 mg, 93z), mp 88-909(lit. 5) …”

“…3,4) Isoamoenylin 6, a dihydrostilbene has been recently isolated from the orchid, Dendrobium amoenum 5) as a new natural product. As a part of our synthetic studies on phenolics, 6,7) we synthesised isoamoenylin for theˆrst time and the results are reported in this note.…”

Antibacterial activity of selected Dendrobium species against clinically isolated multiple drug resistant bacteria

“…Several Dendrobium species are used in traditional medicine as tonics to nourish the stomach, promote the production of body fluids and decrease fever (Ng et al, 2012;Xu et al, 2013). They produce a variety of secondary metabolites, such as phenolic compounds (Hu et al, 2010;Li et al, 2009a;Zhao et al, 2003), bibenzyl derivatives (Bi et al, 2004;Chen et al, 2010;Hu et al, 2008;Li et al, 2009bLi et al, , 2009cLi et al, , 2014Majumder et al, 1999;Majumder and Chatterjee, 1989), lignin glycosides and phenanthrenes (Hu et al, 2008), and alkaloids (Elander et al, 1973;Kierkegaard et al, 1970;Li et al, 2008;Venkateswarlu et al, 2002). Such metabolites are responsible for these species' wide variety of medicinal properties (Chand et al, 2016;Paudel et al, 2015Paudel et al, , 2017.…”