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Table 4 Free-radical scavenging activities of extracts in ABTS assay

From: In vitro antioxidant and free-radical scavenging activities of polar leaf extracts of Vernonia amygdalina

Conc. μg/ml

H2O extract

MeOH extract

EtOH extract

AA

A

%

IC50

A

%

IC50

A

%

IC50

A

%

IC50

50

0.465

12.48

334.93

0.388

26.97

179.8

0.423

20.38

256.9

0.297

44.1

127.7

100

0.443

16.62

0.323

39.21

0.401

24.52

0.242

54.45

150

0.387

27.16

0.274

48.43

0.344

35.25

0.183

65.56

200

0.374

29.61

0.233

56.15

0.331

37.7

0.142

73.27

250

0.347

34.69

0.216

59.35

0.304

42.78

0.085

84

300

0.339

36.19

0.202

61.98

0.299

43.72

0.051

90.4