Table 3.

The recovery of eleven bioactive compounds (n = 3).

Analyte	Original (μg)	Spiked (μg)	Found (μg)	Average recovery (%)	RSD (%)
Gallic acid	3.52	2.82	6.21	95.3	0.88
		3.52	6.91	96.2	1.44
		4.23	7.90	104	1.85
Catechin	2.39	1.91	4.31	100	4.49
		2.39	4.85	103	0.61
		2.87	5.23	98.7	2.70
Epicatechin	9.08	7.26	16.4	101	0.73
		9.08	18.1	99.3	0.09
		10.9	20.3	103	0.33
Polydatin	15.8	12.7	28.3	98.6	3.93
		15.8	32.5	105	0.34
		19.0	35.4	103	0.83
2,3,5,4′-Tetrahydroxystilbene-2-O-β-D-glucoside	519	415	949	104	1.64
		519	1030	98.4	0.37
		623	1168	104	0.64
Resveratrol	9.14	7.31	16.7	103	1.06
		9.14	18.3	100	0.95
		11.0	19.9	98.4	1.59
Emodin-8-O-glucoside	21.3	17.1	39.1	104	1.86
		21.3	41.9	96.4	0.81
		25.6	47.1	101	2.87
Physcion-8-O-glucoside	7.86	6.29	14.4	104	1.57
		7.86	16.1	105	0.67
		9.43	17.6	104	0.82
Rhein	3.53	2.82	6.42	103	1.65
		3.53	6.95	97.2	1.29
		4.23	7.70	98.5	1.45
Emodin	5.79	4.63	10.5	102	0.77
		5.79	11.7	102	0.98
		6.95	13.0	104	1.06
Physcion	3.39	2.71	6.21	104	1.47
		3.39	6.64	95.9	1.07
		4.07	7.46	99.9	0.39