Table 4.
Test sample's concentration reducing 50% of free radical DPPH (RSa50)
| Test samples | RSa50 (μg/ml) |
|---|---|
| Plant extract and fractions | |
| Methanol extract | 7.12 ± 0.21* |
| n-hexane fraction | 35.87 ± 0.07* |
| Ethyl acetate fraction | 3.07 ± 0.04* |
| n-butanol fraction | 3.10 ± 0.10* |
| Aqueous residue fraction | 7.15 ± 0.08* |
| Isolated compoundsa | |
| 1 | 298 ± 0.57* |
| 2 | 1.45 ± 0.00* |
| 3 | 1.45 ± 0.00* |
| 4 | 1.60 ± 0.01* |
| Reference substance | |
| L-ascorbic acid | 0.68 ± 0.00 |
a1:(5S,6R,8aR)-5-(carboxymethyl)-3,4,4a,5,6,7,8,8a-octahydro-5,6,8a-Trimethylnaphthalenecarboxylic acid; 2: methyl 3,4,5-trihydroxybenzoate; 3: benzene-1,2,3-triol and 4: 2,3-dihydroxypropyltriacontanoate.
*Scavenging activity significantly lower than the reference, Duncan (p < 0.05).