Antimicrobial Activity of a Novel Flavonol Glycoside Isolated from the Roots of Clitoria ternatea Linn.

Abstract

A novel biologically active flavonol glycoside 1, m.p. 260-261 °C, m.f.
C₃₃H₄₀O₂₀, [M⁺] 756 (ElMS) was isolated from the ethyl acetate soluble
fraction of the defatted seeds of Clitoria ternatea Linn. It was characterized
as a novel biologically active flavonol glycoside 3,5,4'-trihydroxy-7-
methoxyflavonol-3-O-α-L-xylopyranosyl-( 1→3 )-O-β-D-galactopyranosyl
(1→6)-O-β-D-glucopyranoside by several colour reactions, spectral analysis
and chemical degradations. The compound 1 showed antimicrobial
activity against various becteria and fungi.