Table 2.
IC50 values (μg/ml) of different antioxidant activities of S. mukorossi
| Plant sample | DPPH radical scavenging activity (μg/ml) | Hydroxyl radical scavenging activity (μg/ml) | Nitric oxide scavenging activity (μg/ml) | β-Carotene bleaching inhibition activity (μg/ml) | Iron chelating activity (μg/ml) |
|---|---|---|---|---|---|
| SMM | 162.5 ± 1.29d | 61.97 ± 7.56e | 161.9 ± 5.33e | 24.97 ± 4.9d | 162.5 ± 8.3d |
| SMH | 304.9 ± 4.5c | 101.3 ± 3.88d | 281.4 ± 6.12c | 44.67 ± 4.2c | 304.9 ± 9.9c |
| SMC | 530.7 ± 5.7b | 239.6 ± 8.44c | 207.6 ± 5.8d | 30.5 ± 2.5d | 530.7 ± 6.5b |
| SME | 173.2 ± 1.01d | 44.7 ± 3.09f | 152.9 ± 6.7e | 16.24 ± 5.1e | 173.2 ± 5.6d |
| SMB | 718.8 ± 9.47a | 578.7 ± 3.7b | 531.2 ± 4.7b | 182.3 ± 5.8b | 718.8 ± 9.7a |
| SMA | 523.7 ± 8.45b | 939.6 ± 4.44a | 653.7 ± 4.2a | 355.5 ± 7.8a | 523.7 ± 5.9b |
| Rutin | – | 21.35 ± 3.71g | – | – | – |
| AA | 89.2 ± 4.05e | 25.93 ± 3.08g | 65.92 ± 1.99f | – | – |
| EDTA | – | – | – | – | 89.2 ± 5.99e |
| Catechin | – | – | – | 11.8 ± 3.6e | – |
Values are presented as mean ± SD (n = 3). Means with different superscript (a-e) letters in the rows are significantly (P < 0.01) different from one another. AA, Ascorbic acid; SMM, S. mukorossi methanol extract of stem bark; SMH, n-hexane fraction of SMM; SMC, chloroform fraction of SMM; SME, ethyl acetate fraction of SMM; SMA, soluble residual aqueous fraction of SMM; −, not determined