Tab. 2.
Effects of the tested samples on the in vitro free radical generation
| Bioassay | DPPH % inhibition | Xanthine oxidasea IC50 (μM) |
|---|---|---|
| Ethanolic extract (CA) | 67.2 ± 2.10 | 76.8 ± 2.90 |
| Ethanolic extract (CO) | 58.5 ± 1.50 | 92.1 ± 3.55 |
| Aqueous extract (CA) | 55.6 ± 2.10 | 70.2 ± 2.18 |
| Aqueous extract (CO) | 48.5 ± 1.35 | 95.5 ± 3.70 |
| n-butanol fraction (CA) | 70.3 ± 2.20 | 27.2 ± 2.10 |
| n-butanol fraction (CO) | 65.9 ± 1.96 | 38.5 ± 1.78 |
| 2″-O-β-galactopyranosylvitexin | 84.8 ± 2.44 | 24.2 ± 1.95 |
| dl-α-tocopherol | 66.5 ± 2.75 | 78.5 + 2.88 |
| BHT | 55.3 ± 1.50 | 130.7 + 4.35 |
| Allopurinol | – | 18.0 ± 0.25 |
a
Uric acid production for controls was (61.0 ± 1.9 nmol/min).
All tested samples and positive controls were tested at 100 μg/mL.
Values are presented as mean ± SE of 3-test sample observation. P < 0.05 for all values.
CA = Celtis australis L.; CO = Celtis occidentalis L.