1. Characteristic Regression Data of the SGE-HPLC-DAD Method for the Analysis of Standards CAFF and ChGA.

parameters	CAFF	ChGA
calibration range (μg/mL)	0.40–1000	0.60–1000
detection limit (μg/mL)	0.10	0.16
quantification limit (μg/mL)	0.35	0.53
regression equation (Y)
slope (b)	0.0001	0.0001
intercept (a)	–1.2487	4.6995
correlation coefficient (r 2)	0.9996	0.9991

^a Y = a + bx, where Y is the peak area and x is the concentration.