Table 3. Intra- and inter-day precision of four standards by HPLC.

Compounds	Intra-day(n = 6)		Inter-day(n = 3)
	Concentration (μg/mL)	RSD (%)	Concentration (μg/mL)	RSD b (%)
Gastrodin	9.48 ± 0.38 a	4.00	9.30 ± 0.23	2.46
	15.85 ± 0.59	3.72	15.15 ± 0.30	2.01
	27.09 ± 0.34	1.25	27.09 ± 0.45	1.34
Parishin H	6.40 ± 0.21	3.35	6.29 ± 0.15	2.42
	8.99 ± 0.23	2.72	8.98 ± 0.15	1.48
	20.58 ± 0.66	3.18	20.02 ± 0.81	4.05
Parishin B	35.82 ± 0.59	1.67	35.76 ± 0.67	1.87
	57.56 ± 0.74	1.28	59.52 ± 0.78	1.30
	118.34 ± 0.60	0.51	118.39 ± 0.66	0.21
Parishin	50.88 ± 0.85	1.66	51.77 ± 0.41	0.80
	83.80 ± 0.61	0.72	84.08 ± 0.27	0.32
	167.23 ± 0.94	0.56	167.90 ± 0.81	0.48

^a Mean concentration ± SD.

^b RSD = (SD/mean) × 100