Table 2.
The IC50 values in μM of antioxidant activities of 1–17 (n = 3).
| Compounds | DPPH IC50 (μM) a | ABTS IC50 (μM) a |
|---|---|---|
| 1 | >500 b | >500 |
| 2 | 114.3 ± 4.4 | 87.0 ± 7.9 |
| 3 | 73.8 ± 2.9 | 129.8 ± 12.3 |
| 4 | 91.6 ± 1.4 | 125.4 ± 9.8 |
| 5 | 94.3 ± 2.3 | 123.9 ± 10.4 |
| 6 | 83.0 ± 3.5 | 123.7 ± 12.8 |
| 7 | 104.7 ± 1.8 | 63.7 ± 8.5 |
| 8 | 96.5 ± 2.3 | 53.1 ± 4.8 |
| 9 | 260.5 ± 36.4 | 320.2 ± 22.6 |
| 10 | 64.1 ± 3.3 | 110.8 ± 10.7 |
| 11 | >500 | >500 |
| 12 | >500 | >500 |
| 13 | >500 | >500 |
| 14 | 227.1 ± 33.9 | 160.2 ± 8.8 |
| 15 | >500 | >500 |
| 16 | 52.8 ± 3.3 | 50.0 ± 4.9 |
| 17 | 79.5 ± 1.7 | 65.0 ± 3.9 |
| Ascorbic acid | 88.6 ± 1.9 | 89.8 ± 6.8 |
a Data were represented as mean ± SD; b The IC50 value of sample is higher than 500 μM.