Defatted rice bran (10 g) was extracted with methanol
(150 ml) for 10 h using a soxhlet extractor. The extract
was filtered through a Whatman No. 1 filter paper and
the solvent was removed under vacuum/N2 flow to dryness.
The weighed residue was redissolved in methanol to obtain
an antioxidant solution of known concentration. The crude
methanolic extract (CME) thus obtained was partially
purified by re-extraction with acetone to give an acetone
extract (AE). The lipophilic and polar compounds of the
acetone extract (AE) thus obtained were then separated
by sequential solvent extraction. For this, dry AE was reextracted
with hexane (5 ml 3) to give a soluble fraction
enriched in lipophilic compounds (AE-LP) and a residue
insoluble in the nonpolar solvent. The above residue was
redissolved in acetone to give a fraction enriched in polar
compounds (AE-PP) (Renuka Devi, 2005a). Pure compounds
were isolated from CME by column chromatography
and were identified with the help of UV, IR, NMR and
Mass spectral (MS) data (Renuka Devi, 2005b).