Determination of Flavonoids, Phenolic Acids, and Xanthines in Mate Tea (Ilex paraguariensis St.-Hil.)

Table 2

Results of quantification of individual flavonoids, phenolic acids, and xanthines.

Bioactive compound	Calibration curve	Fraction of flavonoids^1	Fraction of phenolic acids^2	Aqueous solution
		(mg/g)	(mg/g)	(mg/g)
Chlorogenic acid	𝐴=3168.1𝑚+204.2 (𝑟^2=0.9865)	2.1	21.6	3.0
Caffeic acid	𝐴=3313.2𝑚−475.6 (𝑟^2=0.9955)	1.5	nd	nd
Rutin	𝐴=6223.4𝑚−649.8 (𝑟^2=0.9833)	5.2	6.8	2.3
Quercetin	𝐴=6902.1𝑚+723.7 (𝑟^2=0.9788)	2.2	nd	nd
Kaempferol	𝐴=9349.3𝑚−732.7 (𝑟^2=0.9681)	4.5	nd	nd
Caffeine	𝐴=2328.8𝑚+6439.2 (𝑟^2=0.9807)	na	na	5.4
Theobromine	𝐴=3405.5𝑚+1535.9 (𝑟^2=0.9667)	na	na	2.7

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.