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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