Table 2.

Superoxide radical scavenging activity of P. fraternus aqueous and ethanolic extracts of aerial part and root.

Aerial part			Root
Concentration (µg/mL)	Aqueous extract	Ethanol extract	Concentration (µg/mL)	Aqueous extract	Ethanol extract
	Percentage inhibition (mean ± SE)	Percentage inhibition (mean ± SE)		Percentage inhibition (mean ± SE)	Percentage inhibition (mean ± SE)
20	1.81 ± 0.32	6.64 ± 1.53	50	14.08 ± 0.93**	7.6 ± 0.88**
40	48.04 ± 0.86**	30.06 ± 1.36**	100	17.73 ± 0.10**	29.20 ± 0.46**
60	64.51 ± 0.32**	77.32 ± 2.95**	200	24.27 ± 1.21**	62.14 ± 1.08**
80	80.32 ± 0.46**	88.81 ± 0.56**	400	49.78 ± 0.51**	88.09 ± 0.94**
100	99.98 ± 0.03**	—	600	78.02 ± 0.20**	95.55 ± 0.48**
			800	93.72 ± 0.49**	—
EC50	52	55	EC50	391	201

EC₅₀ of Copper sulphate is 4.18.

**Significant at P < 0.001.