Table 3.
The antioxidant activities of G. celebica root bark extracts and isolated compounds 1–3.
| Extracts/Compounds | Antioxidant Capacity | ||||
|---|---|---|---|---|---|
| DPPH | ABTS | FRAP (μM Fe2+/g) | |||
| IC50 (μg/mL) | IC50 (μM) | IC50 (μg/mL) | IC50 (μM) | ||
| n-Hexane | 7.86 ± 0.07 | - | 5.96 ± 0.00 | - | 35.64 ± 1.56 |
| CH2Cl2 | 7.45 ± 0.04 | - | 6.43 ± 0.02 | - | 34.58 ± 1.67 |
| EtOAc | 7.55 ± 0.06 | - | 6.01 ± 0.01 | - | 66.36 ± 5.05 |
| MeOH | 11.40 ± 0.00 | - | 7.63 ± 0.01 | - | 38.75 ± 2.41 |
| 1 | 3.36 ± 0.03 | 5.58 ± 0.05 | 0.78 ± 0.02 | 1.30 ± 0.04 | 22.61 ± 0.06 |
| 2 | 2.98 ± 0.05 | 4.95 ± 0.08 | 0.70 ± 0.02 | 1.16 ± 0.04 | 24.58 ± 0.29 |
| 3 | 2.33 ± 0.06 | 3.87 ± 0.10 | 0.53 ± 0.01 | 0.88 ± 0.02 | 44.28 ± 0.79 |
| Gallic acid | 0.55 ± 0.00 | 3.22 ± 0.02 | 0.12 ± 0.00 | 0.68 ± 0.00 | Nt |
| Quercetin | 1.34 ± 0.02 | 4.43 ± 0.06 | 0.06 ± 0.00 | 0.19 ± 0.00 | Nt |
| Ascorbic acid | Nt | Nt | 30.62 ± 0.27 | ||
Nt: not tested.