2.3. Extraction and isolation
Dried, pulverized roots (2.5 kg) of Glycosmis mauritiana first defatted with petrol (3 l · 5 times) for the removal of apolar substances and then extracted with chloroform,
EtOAc and methanol (3 l · 5 times each). The EtOAc extract was then evaporated under vacuum on rotatory evaporator below 50 C temperature to yield a brownish mass (68 g). A well-stirred suspension of silica gel (100–150 g in petrol-ether 60–80) was poured into column (150 cm long and 50 mm in diameter). When the absorbent was well settled, the excess of petrol-ether was allowed to pass through column. Slurry was made to this mass with silica gel in petrolether and was digested to well stirred column. The column was successively eluted with the petrol, chloroform, EtOAc and methanol and their mixtures of increasing polarity. Elution with CHCl
3
:MeOH (2:8) afforded a yellow powder (1.43 g).