Table 3.

Linear relationship for 10 components.

Compounds	Regression equation	r	Linear range (μg)
Caftaric acid	Y = 780 224X-26 309	0.999 5	0.031–1.240
Esculin	Y = 663 562X-64.866	0.999 9	0.003–6.580
Chlorogenic acid	Y = 1 110 394.140 6X-1 870.192 3	0.999 9	0.003–2.640
Esculetin	Y = 1 426 107.226 9X＋658.466 0	0.999 9	0.003–2.550
Caffeic acid	Y = 2 415 197.655 5X-16 538.257 2	0.999 4	0.003–1.320
Cichoric acid	Y = 1 276 278.386 5X-75 466.526 9	0.999 9	0.059–5.860
Hyperoside	Y = 2 943 470.551 5X-18 007.578 3	0.999 7	0.003–0.504
Rutin	Y = 2 099 754.224 1X-2 287.037 6	0.999 0	0.004–1.408
Isochlorogenic acid C	Y = 1 643 296.574 3X-13 125.421 7	0.999 3	0.004–1.416
Luteolin	Y = 4 098 514.725 1X-21 956.072 3	0.999 3	0.002–0.984