The yields obtained by using various extractants and
their composition of total flavanols and monomeric flavanols are shown in Tables 1 and 2. Of the various sol
vents and solvent mixtures used for the extraction of
total flavanols, the mixture of EtOAC and water (17:3
v/v) was found to be the most effective. Extraction with
MeOH gave maximum yield of the extract but with a
lower content of total flavanols. Yields of extracts in
EtOAc:water (17:3) are significantly less than in acetone, methanol, EtOAc and not significantly different
from EtOAc:water (9:1) or EtOAc:water (4:1).