Table 2.

The effect of S. ningpoensis compounds in the ferric reducing antioxidant power (FRAP) assessment.

Compounds	Concentrations	ferricytochrome c reduction
		OD550 value
Harpagide	10 μM	0.006 ± 0.001
Harpagoside		0.006 ± 0.001
Acteoside		0.502 ± 0.014	***
Isoacteoside		0.579 ± 0.016	***
Angoroside C		0.009 ± 0.002	*
Cistanoside D		0.015 ± 0.002	**
α-Tocopherol	30 μM	0.087 ± 0.009	***

Results are presented as the mean ± S.E.M. (n = 3–6). *p < 0.05, **p < 0.01, ***p < 0.001 compared with the control (DMSO).