Table 3.
Antioxidant activities of extracts and fractions from S. spinosa
| Samples | IC 50 (μg/ml) | |
|---|---|---|
| DPPH | ABTS | |
| Extracts a | ||
| AcetE | 95.42 ± 0.04a | 112.20 ± 0.01a |
| MetE | 36.56 ± 0.02b | 62.74 ± 0.01b |
| DcmMetE | 59.13 ± 0.02c | 150.41 ± 0.02c |
| AlkE | -c) | - |
| Fractions b | ||
| HexF | 203.78 ± 0.03d | 314.30 ± 0.04d |
| ChlF | 230.15 ± 0.04e | 249.82 ± 0.02e |
| EtAcF | 117.77 ± 0.04f | 249.33 ± 0.03e |
| nBuF | 42.07 ± 0.03g | 74.23 ± 0.03f |
| WatF | 33.66 ± 0.04h | 65.02 ± 0.03g |
| Controls | ||
| L-Ascorbic acid | 4.65 ± 0.02i | 2.26 ± 0.04h |
| Trolox | 9.71 ± 0.04j | 16.46 ± 0.02i |
a)AcetE: Acetone extract, MetE: Methanol extract, DcmMetE: Dichloromethane/methanol extract, AlkE: Alkaloids extract, b)HexF: n-hexane fraction, ChlF: Chloroform fraction, EtAcF: Ethyl acetate fraction, nBuF: n-Butanol fraction, WatF: Water fraction, c)no concen- trations decreasing 50% DPPH or ABTS. Values with different letters are significantly different at p < 0.05.