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Table 3 Free radical scavenging activity and MIC of the investigated plants.

From: Studies of the in vitro anticancer, antimicrobial and antioxidant potentials of selected Yemeni medicinal plants from the island Soqotra

Plant species

Extracts

Radical scavenging activity in %

MIC in μg/ml

  

10

(μg/ml)

50

(μg/ml)

100

(μg/ml)

500

(μg/ml)

1000

(μg/ml)

S. aureus

B. subtilis

M. flavus

Acacia pennivenia

Methanolic

Hot aqueous

25.4

4.8

78.5

29.2

88.9

31.1

95.0

42.8

94.0

67.0

250

500

500

1000

250

500

Acanthospermum hispidum

Methanolic

Hot aqueous

2.8

5.2

13.8

11.6

25.9

14.4

55.5

26.3

94.7

27.4

500

> 1000

1000

> 1000

500

> 1000

Acridocarpus socotranus

Methanolic

Hot aqueous

5.1

0.6

40.8

6.7

80.9

37.6

92.6

46.5

94.6

45.3

250

250

1000

> 1000

250

250

Aloe perryi

Methanolic

Hot aqueous

6.7

2.1

19.8

6.4

28.7

20.8

92.4

36.4

94.1

45.9

> 1000

> 1000

> 1000

> 1000

> 1000

> 1000

Ballochia atro-virgata

Methanolic

Hot aqueous

2.1

2.0

5.3

2.7

45.7

34.5

56.8

43.7

94.2

36.7

> 1000

> 1000

> 1000

> 1000

> 1000

> 1000

Blepharis spiculifolia

Methanolic

Hot aqueous

14.8

1.6

13.3

4.4

25.1

34.3

64.6

38.3

91.5

46.8

> 1000

> 1000

> 1000

> 1000

> 1000

> 1000

Boswellia dioscorides

Methanolic

Hot aqueous

25.8

7,8

89.8

39.0

96.1

65.9

96.3

68.2

96.8

74.6

125

500

500

1000

125

500

Boswellia socotrana

Methanolic

Hot aqueous

26.1

2.9

88.2

30.9

94.6

58.5

94.9

62.1

95.1

75.8

125

250

250

500

125

250

Capparis cartilaginea

Methanolic

Hot aqueous

0.2

3.1

3.8

1.1

2.1

22.8

51.2

27.5

87.6

28.2

> 1000

> 1000

> 1000

> 1000

> 1000

> 1000

Commiphora ornifolia

Methanolic

Hot aqueous

20.8

10.6

85.9

25.2

95.0

49.1

95.4

66.2

95.2

72.9

250

500

500

1000

250

500

Corchorus erodioides

Methanolic

Hot aqueous

10.4

4.2

14.3

5.1

27.6

37.6

95.1

57.9

94.1

59.7

> 1000

> 1000

> 1000

> 1000

> 1000

> 1000

Croton socotranus

Methanolic

Hot aqueous

5.3

2.0

12.6

2.9

22.2

10.1

78.9

23.5

93.1

26.4

500

> 1000

1000

> 1000

500

> 1000

Euclea divinorum

Methanolic

Hot aqueous

3.1

14.3

10.6

27.1

36.2

41.5

93.1

52.6

88.6

56.1

250

> 1000

1000

> 1000

500

> 1000

Euphorbia socotrana

Methanolic

Hot aqueous

16.7

1.9

67.4

8.8

95.5

28.7

96.3

36.2

95.2

40.1

500

> 1000

1000

> 1000

500

> 1000

Eureiandra balfourii

Methanolic

Hot aqueous

15.0

7.3

17.8

23.0

8.3

35.4

19.1

42.7

57.7

41.0

> 1000

> 1000

> 1000

> 1000

> 1000

> 1000

Ficus cordata

Methanolic

Hot aqueous

2.5

1.6

12.5

9.3

31.0

16.4

89.2

18.9

91.6

20.4

> 1000

> 1000

> 1000

> 1000

> 1000

> 1000

Glossonema revoili

Methanolic

Hot aqueous

1.7

0.3

14.9

2.7

26.8

2.5

38.6

7.8

76.4

8.1

> 1000

> 1000

> 1000

> 1000

> 1000

> 1000

Hibiscus noli-tangere

Methanolic

Hot aqueous

0.6

1.4

7.3

0.8

18.4

2.8

85.9

5.6

89.0

6.6

> 1000

> 1000

> 1000

> 1000

> 1000

> 1000

Hypoestes pubescens

Methanolic

Hot aqueous

1.5

2.6

4.0

4.2

16.6

3.1

38.7

16.1

72.6

18.3

> 1000

1000

> 1000

> 1000

> 1000

500

Lannea transulta

Methanolic

Hot aqueous

21.9

36.7

64.2

33.2

95.4

37.2

92.1

32.3

98.6

29.9

1000

1000

> 1000

> 1000

1000

1000

Leucas samhaensis

Methanolic

Hot aqueous

2.3

3.8

9.6

5.6

8.0

37.3

61.7

49.3

88.8

47.1

> 1000

500

> 1000

1000

500

500

Leucas virgata

Methanolic

Hot aqueous

1.5

26.2

1.1

34.8

2.8

39.5

27.6

44.0

81.9

51.9

500

500

> 1000

> 1000

1000

500

Lycium sokotranum

Methanolic

Hot aqueous

5.6

26.5

27.8

30.3

29.8

31.2

91.4

37.4

94.2

39.5

500

1000

1000

> 1000

500

> 1000

Maerua angolensis

Methanolic

Hot aqueous

13.8

29.1

19.3

65.1

32.0

69.1

52.5

68.3

82.3

73.9

> 1000

> 1000

> 1000

> 1000

> 1000

> 1000

Rhus thyrsiflora

Methanolic

Hot aqueous

3.8

1.1

29.4

9.3

55.9

12.8

95.6

22.4

95.4

30.5

500

500

> 1000

1000

500

500

Teucrium sokotranum

Methanolic

Hot aqueous

3.4

24.2

2.8

28.7

16.4

38.2

41.0

47.6

92.1

61.4

500

250

1000

1000

500

500

Ascorbic acid

 

42.8

94.2

96.8

96.6

96.9

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