Table 3.

Intra- and interday precision of the marker compounds

Compound	Spiked conc.a)	Intraday (n = 5)			Interday (n = 5)
		Detected conc. (μg/mL)	RSD (%)b)	Accuracy (%)	Detected conc. (μg/mL)	RSD (%)	Accuracy (%)
Gallic acid	7	6.90	2.02	98.55	6.96	1.41	99.46
	15	15.74	0.71	104.92	15.70	0.78	104.64
	30	29.65	0.10	98.85	29.66	0.14	98.87
Oxypaeoniflorin	2	1.96	2.58	97.86	1.97	2.53	98.27
	5	5.06	1.22	101.13	5.06	1.14	101.28
	10	9.98	0.24	99.80	9.97	0.20	99.75
(+)-Catechin	1	1.02	1.93	101.73	1.00	0.98	100.36
	2	2.03	3.43	101.62	2.03	3.49	101.65
	4	3.98	0.87	99.62	3.98	0.90	99.57
Albiflorin	3	2.94	1.46	98.08	2.92	1.68	97.39
	7	6.91	0.90	98.65	6.95	1.11	99.22
	15	15.06	0.17	100.37	15.04	0.20	100.27
Paeoniflorin	10	10.23	1.44	102.31	10.18	1.88	101.79
	20	21.49	0.70	107.47	21.47	0.75	107.37
	40	39.19	0.17	97.99	39.22	0.22	98.04
Liquiritin	5	4.90	1.07	98.04	4.91	1.34	98.24
	10	9.92	0.17	99.21	9.91	0.32	99.08
	20	20.06	0.08	100.32	20.07	0.05	100.34
Benzoic acid	5	4.78	0.68	95.64	4.77	0.46	95.38
	10	10.01	0.37	100.10	10.02	0.46	100.22
	20	20.05	0.12	100.25	20.05	0.10	100.23
Isoliquiritin	0.5	0.50	0.18	100.26	0.50	0.28	100.30
	1	0.97	0.16	96.72	0.97	0.18	96.79
	2	2.02	0.05	100.80	2.02	0.04	100.78
Ononin	0.5	0.50	1.67	100.42	0.50	1.44	99.71
	1	0.95	1.22	95.08	0.96	2.25	96.12
	2	2.02	0.21	101.20	2.02	0.48	100.99
Benzoylpaeoniflorin	1.5	1.56	0.83	103.89	1.56	0.73	104.32
	3	2.86	0.92	95.36	2.86	0.94	95.26
	6	6.05	0.20	100.92	6.05	0.20	100.91
Glycyrrhizin	10	10.10	0.97	101.00	10.12	0.87	101.21
	20	21.21	0.37	106.06	21.17	0.26	105.85
	40	39.37	0.09	98.42	39.38	0.08	98.46

^aConc., concentration.

^bRSD (%) = (SD/mean) × 100.