Table 3.

Calibration curves and LLOQ of the components in plasma.

Compounds	Calibration curve	Linear range (ng/ml)	Correlation coefficient (r)	LLOQ (ng/ml)
Stachydrine	y = 0.0028x + 0.0007	5-2500	0.999	5.00
Danshensu	y = 0.0013x − 0.00001	1-500	0.999	1.00
Chlorogenic acid	y = 0.0100x − 0.0007	0.1-50	0.999	0.10
Protocatechuic acid	y = 0.0056x + 0.0006	0.1-50	0.999	0.10
Plantamajoside	y = 0.0020x − 0.0001	0.05-25	0.999	0.05
Aesculetin	y = 0.0269x + 0.0023	0.1-50	0.999	0.10
Isoquercitrin	y = 0.0131x − 0.0005	0.1-50	0.999	0.10
Ferulic acid	y = 0.0028x − 0.0056	1-500	0.999	1.00
Baicalin	y = 0.0116x − 0.0056	5-2500	0.999	5.00
Baicalein	y = 0.00097x − 0.0003	1-500	0.999	1.00