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The IC50 (concentrations at which half the tyrosinase activity is inhibited) values of active plant extracts and positive control.
| Plant extracts/ Positive control | IC50 (Tyrosine) μg/mL | IC50 (L-DOPA) μg/mL |
|---|---|---|
| Harpephyllum caffrum (Leaves) | 51 ± 0.002 | 125 ± 0.08 |
| Harpephyllum caffrum (Bark) | 40 ± 0.035 | 250 ± 0.12 |
| Kojic acid | 2.145 ± 0.082 | 26.66 ± 0.104 |
