Table 1.
Antioxidant activity of the extracted compounds at 100 μM. (-), no testing; (na), not active.
| Compounds | DPPH (%) | Chelating (%) | Reducing power (OD 700) |
|---|---|---|---|
| Vitamin C a | 88.5 ± 1.8 | - | - |
| EDTA b | - | 41.6 ± 4.5 | - |
| BHA c | - | - | 1.9 ± 0 |
| (−)-Anonaine (1) | na | 2.9 ± 0.0 | 0.1 ± 0 |
| (−)-Norstephalagine (2) | na | na | 0.1 ± 0 |
| (−)-Liridinine (3) | 0.5 ± 0 | na | 0.1 ± 0 |
| (+)-Nornuciferine (4) | - | - | - |
| (+)-Caaverine (5) | na | na | 0.2 ± 0 |
| (+)-Lirinidine (6) | 6.50 ± 0 | na | 0.7 ± 0 |
| Lysicamine (7) | na | na | 0.1 ± 0 |
| Scopoletin (8) | na | na | 0.4 ± 0 |
| Epitulipinolide diepoxide (9) | na | 1.8 ± 0 | 0.3 ± 0 |
| Methyl β-orcinol carboxylate (10) | na | 4.6 ± 0 | 0.2 ± 0 |
| Syringaldehyde (11) | na | 3.4 ± 0 | 0.3 ± 0 |
| Syringic acid (12) | - | - | - |
| Vanillic acid (13) | na | 3.39 ± 0 | 0.3 ± 0 |
| (−)-Liriodendritol (14) | na | na | 0.1 ± 0 |
| β-Sitosterol (15) | - | - | - |
| Stigmasterol (16) | - | - | - |
Data were expressed as a mean value of at least three independent experiments; a Vitamin C was used as a positive control on DPPH assay at 100 μM; b EDTA was used as a positive control on metal chelating ability at 100 μM; c BHA was used as a positive control on reducing power at 100 μM.