Table 2: Results of quantification of individual flavonoids, phenolic acids, and xanthines.

Bioactive compoundCalibration curveFraction of flavonoids1Fraction of phenolic acids2Aqueous solution

Chlorogenic acid ( )
Caffeic acid ( )1.5ndnd
Rutin ( )
Quercetin ( )2.2ndnd
Kaempferol ( )4.5ndnd
Caffeine ( )nana5.4
Theobromine ( )nana2.7

1Hydrolyzed fraction of flavonoids, 2nonhydrolyzed fraction of phenolic acids used for the spectrophotometric analysis according to the European pharmacopoeia, and nd: not detected, na: not applicable.