Table 3.

Mixed calibration standard (linearity) preparation details

Phenolic compound	Calibration std ID	Lin 1	Lin 2	Lin 3	Lin 4
Caftaric acid	Stock solution IDa	Caf 1000	Caf 1000	Caf 1000	Caf 1000
	Volume, µL	150	100	50	25
Chlorogenic acid	Stock solution ID	Chloro 1000	Chloro 200	Chloro 200	Chloro 200
	Volume, µL	50	100	50	25
Cichoric acid	Stock solution ID	Cich 1000	Cich 1000	Cich 1000	Cich 1000
	Volume, µL	200	100	50	25
Cynarin	Stock solution ID	Cyn 1000	Cyn 100	Cyn 100	Cyn 100
	Volume, µL	50	200	100	50
Echinacoside	Stock solution ID	Ech 1000	Ech 1000	Ech 1000	Ech 1000
	Volume, µL	300	200	100	50
Extraction solvent volume, µL		250	300	650	825

^aID = Identification code.