Table 4.
Antioxidant activities of tropical plant extracts
| Plant tested | Free radical scavenging activity1) | |
|---|---|---|
|
| ||
| Solvent fraction | EC50 value (mg/mL) | |
| Poncirus trifoliata fruit (Makrut) | Methanol | 1.47±0.4222) |
| Zingiber officinale Rosc (Khing) | n-Hexane | 2.23±1.48 |
| Chloroform | 1.23±0.39 | |
| Ethylacetate | ND | |
| Buthanol | 1.10±0.40 | |
| Areca catechu L. (Mak) | Methanol | 1.06±0.11 |
| Water | 2.11±0.49 | |
| Buthanol | ND | |
| Solanum melongena L. (Makkhuayao) | Buthanol | 1.85±0.27 |
| Solanum melongena L. (Makhuapro) | Buthanol | 1.66±0.14 |
ND, not detected; DPPH, 2-diphenyl-2-picryl hydrazyl; BHT, tert-butyl hydroxytoluene.
1)
Free radical scavenging activity was determined by DPPH photometric assay and described in EC50 value which means the concentration at 50% of antioxidant activity. BHT was used as a positive control showy EC50 of 0.3±0.04 mg/mL.
2)
Mean±standard error (n = 3).