Pharmacokinetic Comparative Study of Gastrodin and Rhynchophylline after Oral Administration of Different Prescriptions of Yizhi Tablets in Rats by an HPLC-ESI/MS Method

Table 2

Regression equations, correlation coefficients (), linearity ranges, and lower limit of quantitation (LLOQ) for GAS, HBA, and RIN in plasma.

Marker compounds	Calibrations		Linear range (g/mL)	LLOQ (g/mL)
GAS		0.9907	1–250	0.50
HBA		0.9994	1–100	0.50
RIN		0.9916	0.25–50	0.38