Table 2.

Stability studies of standard stock solutions of salicin, hyperin and rutin standards in methanol (n = 5).

Indicators	Number	Compounds
		Salicin	Hyperin	Rutin
Standard solution	1	14.62	2.54	2.66
	2	7.31	1.27	1.33
	3	1.462	0.254	0.266
Recovered concentration after 4 h (mg/mL)	1	14.60	2.55	2.65
	2	7.32	1.26	1.32
	3	1.462	0.253	0.267
RSD% (n = 5)	1	1.11	0.97	0.96
	2	0.98	0.98	0.98
	3	0.98	0.93	1.01
Average recovery of intra-day (%)	1	99.86	100.39	99.62
	2	100.14	99.21	99.25
	3	100.00	99.61	100.38
Recovered concentration after 5d (mg/mL)	1	14.61	2.54	2.66
	2	7.31	1.26	1.33
	3	1.463	0.254	0.265
RSD% (n = 5)	1	1.05	0.99	0.97
	2	0.97	0.97	0.98
	3	1.00	0.97	0.99
Average recovery of inter-day (%)	1	99.93	100.00	100.00
	2	100.00	99.21	100.00
	3	100.07	100.00	99.62