Table 3. DPPH free radical-scavenging activity (%) of ExEP at different concentrations (μg/mL).
| Sample | Concentration (μg/mL) | |||||||
|---|---|---|---|---|---|---|---|---|
| 1 | 10 | 50 | 100 | 200 | 300 | 500 | IC50 | |
| Asc. acid | 12.8 ± 2.7 | 93.7 ± 0.5 | 96.8 ± 0.4 | 96.5 ± 0.6 | 96.7 ± 0.4 | 97.0 ± 0.4 | 97.0 ± 0.3 | 3.36 ± 0.8 |
| BHT | 4.1 ± 1.7 | 20.4 ± 3.4 | 54.5 ± 5.9 | 71.9 ± 4.1 | 86.5 ± 1.7 | 90.1 ± 0.5 | 93.8 ± 0.4 | 52.8 ± 19.3 |
| ExEP-P | 23.4 ± 2.9 | 21.2 ± 0.9 | 29.9 ± 1.8 | 44.3 ± 3.1 | 57.8 ± 1.0 | 74.3 ± 2.2 | 94.6 ± 0.9 | 182.4 ± 58.9 |
| ExEP-A | 4.5 ± 1.6 | 16.0 ± 1.5 | 47.8 ± 2.2 | 80.0 ± 1.3 | 90.4 ± 0.4 | 94.6 ± 0.3 | 92.7 ± 0.6 | 49.8 ± 5.0 |
Asc. acid = Ascorbic acid