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Diphenyl picryl hydrazyl (DPPH) and β-carotene-linoleic acid of Catalpa speciosa, Taxus cuspidata, Magnolia acuminnata outer bark extracts.
| Plant/Standard | DPPH Free Radical Scavenging Activity (IC50, µg mL−1) |
β-Carotene-Linoleic Acid Assay (IC50, µg mL−1) |
|---|---|---|
| Catalpa speciosa | 4.4 ± 0.1a | 5.1 ± 0.1a |
| Taxus cuspidata | 4.2 ± 0.1b | 4.8 ± 0.1b |
| Magnolia acuminnata | 3.1 ± 0.1c | 3.6 ± 0.1c |
| BHT | 2.9 ± 0.1c | 3.2 ± 0.1c |
