Antioxidant activity of the stem bark of Shorea roxburghii and its silver reducing power

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Table 1 Radical scavenging activities of the stem bark extract of S. roxburghii

	DPPH radical scavenging activity (%)
Concentrations	SAE	IC₅₀	SME	IC₅₀	Vitamin C	IC₅₀
μg/mL		(μg/mL)		(μg/mL)		(μg/mL)
20	26.96 ± 0.09		19.75 ± 0.15		12.67 ± 0.06
40	29.56 ± 0.12		26.26 ± 0.07		44.16 ± 0.21
60	34.37 ± 0.15	na*	31.72 ± 0.09	na*	74.42 ± 0.12	45.74
80	39.33 ± 0.15		38.54 ± 0.12		89.51 ± 0.09
100	43.94 ± 0.12		42.78 ± 0.15		97.13 ± 0.06
	Hydroxyl radical scavenging activity (%)
20	29.89 ± 0.59		28.80 ± 0.40		30.46 ± 0.78
40	44.97 ± 0.13		47.80 ± 0.30		44.44 ± 0.39
60	52.59 ± 0.27	52.56	58.08 ± 0.08	50.93	63.66 ± 0.26	45.91
80	67.41 ± 0.46		65.45 ± 0.20		73.73 ± 0.52
100	75.16 ± 0.35		74.25 ± 0.92		86.27 ± 0.13
	ABTS radical scavenging activity (%)
20	20.77 ± 0.92		19.60 ± 1.40		28.28 ± 1.20
40	45.07 ± 0.61		19.60 ± 1.40		46.40 ± 0.40
60	56.13 ± 1.01	55.24	58.13 ± 0.61	55.96	69.73 ± 0.92	43.05
80	65.20 ± 0.80		64.40 ± 0.40		83.47 ± 0.46
100	79.20 ± 1.06		86.27 ± 1.22		97.96 ± 0.04
	Hydrogen peroxide scavenging activity (%)
20	24.24 ± 0.38		15.65 ± 0.60		41.88 ± 0.68
40	32.34 ± 0.30		35.22 ± 0.62		58.17 ± 0.56
60	46.45 ± 0.23	87.18	50.27 ± 0.31	63.67	72.33 ± 0.52	28.53
80	25.77 ± 0.34		63.39 ± 0.52		81.27 ± 0.31
100	67.06 ± 0.45		73.47 ± 0.39		90.71 ± 0.38
	Ferric reducing power (OD)*
20	0.078 ± 0.008		0.139 ± 0.006		0.216 ± 0.002
40	0.165 ± 0.004		0.235 ± 0.005		0.387 ± 0.005
60	0.205 ± 0.007	na*	0.347 ± 0.007	na*	0.568 ± 0.007	52.19
80	0.258 ± 0.008		0.431 ± 0.001		0.767 ± 0.013
100	0.376 ± 0.006		0.479 ± 0.009		0.918 ± 0.007