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The antioxidant activity of the five compounds.
| Samples | IC50 (μg/mL) | Reducing Power | |
|---|---|---|---|
| DPPH | ABTS | ||
| luteolin | 4.168 | 5.587 | 0.0028 |
| 4-hydroxy benzoic acid | 6.838 | 58.78 | 0.0012 |
| 3,4-dihydroxy benzoic acid | 0.703 | 5.186 | 0.013 |
| catalposide | 20.16 | 43.83 | 0.0004 |
| verproside | 6.502 | 16.9 | 0.0018 |
| Vc | 0.57 | 4.645 | |
| BHT | 0.0016 | ||
