Fractionation of hexane and dichloromethane extracts
Five grams of crude hexane extract was further
purified by column chromatography. Silica gel 60 (35 -
70 mesh) was used as the adsorbent and the column
was eluted with 1% dichloromethane in hexane. A total
70 fractions, 20 mL each, were collected. Fifteenth to
seventieth fractions were combined and these fractions
showed one spot on thin-layer chromatography (TLC) but
it disappeared quickly. The fractions were dried under
vacuum. The dried residue was dissolved in
dichloromethane and was crystallized with methanol.
Pale yellow amorphous solid was obtained.