ISOLATION AND CHARACTERIZATION OF NEW FLAVONOL GLYCOSIDE FROM THE SEEDS OF ALNUS NEPALENSIS D.DON.

摘要

The present paper deals with isolation and characterisation of a new flavonol glycoside 5.7,3',4' tetrahydroxy-6-methoxy-8-methylflavone-3-o-0C-gluco pyranoside.The defatted seed powder(500 gm.)of A Inns nepalensis was extracted with ethanol for 36 hr in soxlet.The extract on concentration yielded a light yellow syrupy mass.It was then extracted with acetone.The residue was dissolved in methanol and precipitation by addition of a large amount of ether.The process of dissolving and precipitation was repeated several times and finally the solution was decolourised by passing through beds of actuated charcoal.On removal of solvent brown mass of glycoside was obtained in yield of 9 7%.