| Compound |
Concentration ( µg mL-1) |
| 25 |
50 |
75 |
100 |
IC50 |
| 4a |
56.21± 0.76 |
57.15± 0.62 |
59.75± 0.65 |
60.20± 0.94 |
22.23± 0.30 |
| 4b |
54.32± 0.27 |
55.35± 0.93 |
57.25± 0.07 |
61.16± 0.97 |
23.01± 1.41 |
| 4c |
59.35± 0.25 |
60.34± 0.18 |
62.46± 0.16 |
64.16± 0.72 |
21.06± 1.23 |
| 4d |
− |
− |
− |
− |
− |
| 4e |
58.29± 0.64 |
62.24± 0.96 |
64.54±1.08 |
68.72± 0.98 |
21.44± 0.33 |
| 4f |
64.29± 0.27 |
65.26± 0.17 |
66.72± 0.23 |
67.14± 0.10 |
19.44± 0.14 |
| 4g |
62.35± 0.10 |
62.66± 0.36 |
63.49± 0.89 |
69.14± 1.06 |
20.04± 1.18 |
| 4h |
− |
− |
− |
− |
− |
| 4i |
64.32± 0.09 |
66.13± 0.20 |
67.14± 0.61 |
72.14± 0.02 |
19.43± 0.08 |
| 4j |
65.45± 0.22 |
68.29± 0.92 |
70.39± 0.12 |
73.28± 0.90 |
19.09± 0.09 |
| Ascorbic acid |
68.04± 0.18 |
71.24± 0.15 |
72.43± 0.22 |
75.29± 0.03 |
18.37± 0.04 |
| Blank |
− |
− |
− |
− |
− |
|
| (−) showed no scavenging activity. Values were the means of three replicates± SD |
| Table 2: The in vitro antioxidant activity of (4a–j) in DPPH method |