Table 2.
Radical scavenging activity of β-carbolines (10 μM) in the DPPH, ABTS and ORAC antioxidant assays. Ascorbic acid, resveratrol and trolox that are well-known antioxidants were used as reference.
| Compound | % radical scavenging
|
||
|---|---|---|---|
| DPPH | ABTS | ORAC | |
| 1 | −7 | 12 | 10 |
| 2 | 2 | 10 | 10 |
| 3 | −6 | 16 | 35 |
| 4 | −12 | 13 | 28 |
| 5 | −13 | 15 | 41 |
| 6 | −3 | 22 | 54 |
| 7 | - | - | - |
| 8 | 0 | 15 | 58 |
| 9 | −3 | 6 | 6 |
| 10 | −1 | 7 | −10 |
| 11 | 2 | 3 | 5 |
| 12 | −4 | 5 | 5 |
| 13 | - | - | - |
| 14 | −6 | 14 | 0 |
| Ascorbic acid | 15 | 28 | 15 |
| Resveratrol | 28 | 88 | 91 |
| Trolox | 23 | 26 | 90 |
– Data not measured due to solubility problems.