Table 4. Recovery of four standards in the extraction of GE (n = 3).

Compounds	Initial amount (mg)	Added amount (mg)	Total recovered amounta (mg)	Recoveryb (%)	RSDc (%)
Gastrodin	1.09	0.62	1.62 ± 0.01	88.02	1.26
	1.09	2.24	3.35 ± 0.03	100.91	1.54
	1.09	3.86	4.93 ± 0.01	99.65	0.30
Parishin E	1.22	0.42	1.62 ± 0.02	94.65	0.57
	1.22	2.04	3.33 ± 0.03	105.38	1.46
	1.22	4.11	5.01 ± 0.03	92.15	0.70
Parishin B	1.14	0.32	1.43 ± 0.00	89.88	0.52
	1.14	1.72	2.88 ± 0.01	101.96	0.58
	1.14	3.45	4.35 ± 0.00	92.85	0.13
Parishin	2.55	2.87	5.34 ± 0.01	97.66	0.34
	2.55	8.23	10.78 ± 0.02	100.43	0.00
	2.55	13.86	16.21 ± 0.01	98.49	0.07

^a Total recovered amount = mean content ± SD.

^b Recovery (%) = (detected amount—original amount)/spiked amount × 100.

^c RSD = (recovery SD/mean) × 100