Plant materials were ground and macerated for extraction.
Twenty grams of each prepared sample were weighed into 1 l Erlenmeyer
flasks, and then 200 ml of solvents with varying polarities
(methanol, ethanol, diethyl ether and hexane) were added to the
samples. Extraction was carried out by shaking at room temperature
for 72 h. After filtration through filter paper (Whatman No. 4),
the residue was re-extracted twice, and then the combined extracts
of every sample were evaporated at room temperature and dried in
desiccators under vacuum to a constant weight. The final residues
were used to study their antioxidant activities