Table 2.
EC50 values of the isolated compounds and standards.
| Tested compounds | Radical scavenging assay (EC50) (μg/mL)a | Reducing power assay (EC50) (μg/mL)b |
|---|---|---|
| Bergenin (1) | 99.807 ± 3.120 | 24.915 ± 1.326 |
| 11-O-Galloylbergenin (2) | 7.276 ± 0.058 | 5.208 ± 0.095 |
| Ascorbic acid | 6.571 ± 0.303 | 3.551 ± 0.073 |
| Gallic acid | 4.732 ± 0.187 | 1.542 ± 0.062 |
| Quercetin | 4.355 ± 0.099 | 2.073 ± 0.065 |
| α-Tocopherol | 33.675 ± 2.019 | 22.152 ± 1.153 |
Each reading is mean (n = 3) ± SD (standard deviation). aEC50: effective concentration at which 50% of DPPH radicals are scavenged and bEC50: effective concentration at which the absorbance is 0.4.