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 3

Precision and accuracy of HPLC-MS method in rat plasma ().

Marker compounds	Concentration (g/mL)		RSD (%)		RE (%)
	Added	Found	Intraday	Interday
GAS	15	13.7 ± 0.3	4.49	8.23	4.5
	100	102.7 ± 2.3	4.57	3.78	4.6
	250	242.9 ± 2.0	1.64	6.21	1.6
HBA	2	1.9 ± 0.06	6.25	6.70	6.2
	10	9.3 ± 0.4	8.62	2.80	8.6
	50	46.2 ± 1.9	8.32	4.51	8.3
RIN	2	1.9 ± 0.04	4.02	4.08	4.0
	10	9.8 ± 0.4	8.64	7.43	8.6
	50	48.3 ± 1.6	6.46	8.47	6.5