Investigation on the secondary metabolites of the leaves of Phlogacanthus pubinervius Nees. led to the
isolation of a new terpenoidal glycoside, 3-O-[ß-D-glucopyranosyl-(1’2’)--L-rhamnopyranosylphlogaca-nthoside],
5 along with five other compounds including -sitosterol (1), -sitosterol-D-glucoside (2), Stigmasta-5,22-dien-7-on-3ß-ol
(3), 19-hydroxy- phlogacantholide (4), and (2E,7Z)-2,6-dihydroxycycloocta-2,7-dienone (6). The structures of the
compounds (1-6) were established by physical and spectroscopic analysis. Free radical scavenging activities of the isolates
were evaluated by using 1,1-diphenyl-2-picrylhydrazyl (DPPH) method and the Isosbestic points of the isolates were also
Keywords: Phlogacanthus pubinervius, leaves, terpenoidal glycoside, free radical, scavenging, isosbestic point, phytoconstituent, metabolites, leaves, compound.
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