Table 4.

Analytical results of the precision tests.

Components	Reference concentration (μg/mL)	Mean ± SD (%)	RSD (%)
Chrysophanol-8-O-β-D-glucoside	16.40	0.1304 ± 0.0007	0.52
Emodin-8-O-β-D-glucoside	20.10	0.1095 ± 0.0005	0.44
Aloe-emodin-3-(hydroxymethyl)-O-β-D-glucoside	9.70	0.0422 ± 0.0002	0.39
Physcion-8-O-β-D-glucoside	14.20	0.0449 ± 0.0006	1.24
Aloe-emodin	20.00	0.0707 ± 0.0013	1.90
Rhein	27.00	0.1419 ± 0.0028	1.98
Emodin	78.00	0.1681 ± 0.0028	1.65
Chrysophanol	34.40	0.3208 ± 0.0054	1.67
Physcion	22.20	0.1143 ± 0.0017	1.44