Calibration curves and the contents of the identified polyphenols in FTE by HPLC^a.

Peak no.	t R (min)	Identified/polyphenols	Regression equation Y = aX + b	R 2	Contentb (mg g−1)
1	6.43	Gallic acid	Y = 5.9167X + 0.4124	0.9998	21.44 ± 0.09
2	7.16	Gallocatechin	Y = 87.147X − 14.651	0.9992	26.56 ± 0.11
3	8.90	Epigallocatechin	Y = 94.968X − 1.4862	0.9941	67.70 ± 0.79
4	9.39	Catechin	Y = 21.611X + 3.4979	0.9995	10.48 ± 0.16
5	10.87	Caffeic acid	Y = 23.684X + 8.7968	0.9992	22.27 ± 0.16
6	11.47	Epigallocatechin gallate	Y = 8.7325X + 0.6203	0.9996	111.93 ± 0.06
7	12.06	Epicatechin	Y = 7.898X + 0.0708	0.9994	6.12 ± 0.03
8	13.10	Gallocatechin gallate	Y = 5.2995X + 3.1846	0.9999	3.79 ± 0.14
9	15.64	Epicatechin gallate	Y = 4.5062X − 0.6542	0.9984	1.11 ± 0.01
10	23.87	Theaflavins	Y = 23.073X + 3.0737	0.9937	4.84 ± 0.26

^a Y is the characteristic peak area in HPLC chromatograms, and X is the concentration of the samples.

^bContents of each component in FTE is expressed as mg g⁻¹ dried extract.