The yields of hexane, ethyl acetate, chloroform, butanol
and methanol extracts of the leaves of Tetrastigma were
1.80%, 9.40%, 23.08%, 5.28% and 24.3%, respectively. The
total phenolic contents of the essential oil and all extracts
as determined by Folin-Ciocalteu method are reported as
gallic acid equivalents (Table 1). Among the five extracts,
methanol extract showed the highest [(386.22 依 13.00) mg/g)]
amount of phenolic compounds followed by ethyl acetate
extract [(190.89 依 11.97) mg/g], chloroform extract [(175.89
依 19.45) mg/g], hexane extract [(173.44 依 1.20) mg/g]