Table 4.
ABTS radical scavenging of compounds 5a–d and 10.
| Concentration (μM) | Compounds | ||||
|---|---|---|---|---|---|
| 5a | 5b | 5c | 5d | 10 | |
| 5 | nt | nt | nt | nt | 2.39 ± 0.57 |
| 10 | - | - | - | - | 27.81 ± 2.12 *** |
| 50 | 11.74 ± 0.47 *** | 9.69 ± 0.57 ** | 4.18 ± 1.23 | 0.30 ± 0.33 | 87.59 ± 4.81 *** |
| 100 | 22.84 ± 1.02 *** | 22.32 ± 1.65 *** | 11.60 ± 1.50 *** | 3.10 ± 0.48 *** | 94.03 ± 1.05 *** |
| 500 | 77.61 ± 0.81 *** | 73.92 ± 4.96 ** | 59.51 ± 4.16 *** | 17.05 ± 0.47 *** | x |
| IC50 | 297.00 ± 1.00 | 315.30 ± 30.02 | 419.30 ± 35.80 | - | 25.00 ± 2.00 |
Notes: Data are represented as mean ± SD (n = 3). The values are expressed in percentage of inhibition in relation to control. IC50 = concentration compound required for 50% scavenging, in μM. The asterisks represent significant difference (**) p < 0.01; (***) p < 0.001 when compared with control sample by Student–Newman–Keuls test for post-hoc comparison. nt = not tested. x = sample blurred color.