Table 1.
Antioxidant activity of coumarin compounds and ascorbic acid using DPPH antioxidant assay (IC50, μg/mL).
| Compd | IC50 | Compd | IC50 | Compd | IC50 |
|---|---|---|---|---|---|
| 2a | — | 5f | — | 8d | 4.30 ± 0.531 |
| 2b | — | 7a | 93.12 ± 0.727 | 8e | 32.85 ± 1.322 |
| 3a | — | 7b | 61.78 ± 2.719 | 8f | 35.36 ± 3.265 |
| 3b | 48.38 ± 4.616 | 7c | 120.12 ± 4.629 | 9a | — |
| 4a | — | 7d | 112.19 ± 4.391 | 9b | — |
| 4b | — | 7e | 71.67 ± 3.231 | 9c | — |
| 5a | — | 7f | 83.52 ± 1.849 | 9d | — |
| 5c | — | 8a | 14.51 ± 1.827 | 9e | — |
| 5d | 82.92 ± 3.300 | 8b | 19.25 ± 4.171 | 9f | — |
| 5e | — | 8c | 3.87 ± 0.409 | Ascorbic acid * | 2.83 ± 0.166 |
Values represent mean ± SD (n = 3). (—): inactive (IC50 > 200 μg/mL). * Positive control. DPPH, 2,2-diphenyl-1-picrylhydrazyl; IC50, half maximal inhibitory concentration; Compd, compound.