Table 2.

Intraday and interday precision and stability of the 11 compounds (n = 6).

Compounds	Concentration (μg/mL)	Intraday		Interday		Stability
		RSD (%)	Accuracy (%)	RSD (%)	Accuracy (%)	RSD (%)	Accuracy (%)
Gallic acid	1	4.31	96.6	1.35	97.6	4.77	106
	10	2.46	102	0.82	107	3.96	99.3
	100	2.57	97.2	0.75	99.3	3.49	97.3
Catechin	1	3.35	96.7	2.65	95	4.69	100
	10	1.98	100	1.94	101	4.98	95
	100	2.17	98.6	2.05	95.2	4.96	95.2
Epicatechin	1	1.85	95.2	1.44	94.7	2.26	96.7
	10	4.09	103	0.08	104	3.88	95.2
	100	3.79	94.7	0.15	94.2	4.23	103
Polydatin	1	0.90	98.2	2.17	95.3	4.70	98.2
	10	3.02	106	2.80	106	3.83	95
	100	3.12	93.8	2.75	98.2	3.96	106
2,3,5,4′-Tetrahydroxystilbene-2-O-β-D-glucoside	1	4.84	95	1.79	97.3	3.25	93.7
	10	3.50	102	0.45	100	4.87	96.4
	100	3.21	96.6	1.88	96.7	4.64	99.3
Resveratrol	1	4.32	102	2.15	102	3.94	97.1
	10	3.28	97.3	4.91	96.1	4.79	97.1
	100	3.29	99.3	0.81	93.7	2.91	99.5
Emodin-8-O-glucoside	1	2.81	101	1.80	103	4.16	96.1
	10	3.51	96.7	1.40	96.4	3.45	106
	100	3.76	95	0.98	96.4	3.24	93.7
Physcion-8-O-glucoside	1	5.00	99.8	2.12	97.1	2.76	96.4
	10	4.50	96.2	1.50	95.8	4.78	99.3
	100	4.68	95.2	1.45	95	4.97	97.1
Rhein	1	4.43	96.9	2.06	102	2.80	95
	10	4.20	95.8	2.80	93.7	3.86	102
	100	4.67	94.7	2.79	103	2.76	96.1
Emodin	1	4.69	104	2.76	96.4	4.91	96.3
	10	4.46	95	4.25	97.1	2.77	96.4
	100	4.28	94.2	3.57	95.8	3.04	97.3
Physcion	1	3.75	106	3.01	95	4.34	99.5
	10	4.95	96.4	2.23	102	3.77	97.2
	100	4.90	97.3	2.23	103	3.27	95.6