Table 2.

The calibration curves, linearity range, and LLOQs of 6 compounds (n = 6).

Compounds	Regression equation	R	Linearity range	LLOQ (ng ml−1)
Gallic acid	Y = 0.0157X − 0.0112	0.9920	2–500	2
Bergeninum	Y = 0.00125X + 0.000782	0.9983	2–500	2
Epicatechin	Y = 0.00223X + 0.00102	0.9984	4–1000	4
Epicatechin gallate	Y = 0.00579X − 0.00933	0.9940	2–500	2
Isoquercitrin	Y = 0.00582X + 0.00202	0.9964	1–250	1
Quercetin-3-rhamnoside	Y = 0.0156X − 0.000007	0.9971	0.4–100	0.4