2.2. Preparation of crude extracts
Each plant material was dried at room temperature protected
from direct sun light and ground to fine powder in a mechanic
grinder and 10.0 g was weighed accurately in a digital balance
(Mettler Toledo AG245). Then, each plant was successively extracted
with dichloromethane (CH2Cl2), ethyl acetate (EtOAc),
and then methanol (MeOH). After filtration of each solvent, the organic
phases were independently concentrated under vacuum by
evaporating to dryness. Yields (w/w) of the crude extracts were given
in Table