Table 2.
The antioxidant activities demonstrated by Streptomyces MUM273b extract in different antioxidant assays
| Concentration of Streptomyces sp. MUM273b extract (μg/ml) | Antioxidant activities | |||
|---|---|---|---|---|
| DPPH radical scavenging activity (%) | ABTS radical scavenging activity (%) | Superoxide dismutase‐like activity (%) | Metal‐chelating activity (%) | |
| 250 | ND | 7.08 ± 1.79* | ND | 11.08 ± 1.40* |
| 500 | ND | 10.03 ± 2.16* | 1.76 ± 2.66 | 11.56 ± 1.74* |
| 1,000 | 1.76 ± 0.31 | 12.31 ± 1.09* | 7.07 ± 1.75* | 14.18 ± 2.8* |
| 2000 | 5.00 ± 1.03* | 16.15 ± 2.73* | 13.89 ± 1.91* | 17.90 ± 2.68* |
| 4,000 | 8.83 ± 0.87* | 32.26 ± 0.61* | 22.47 ± 2.73* | 23.44 ± 1.63* |
| Gallic acid | ||||
| 6.25 | 34.48 ± 3.42* | 56.24 ± 4.89* | — | — |
| Catechin | ||||
| 7.5 | — | — | 66.65 ± 0.88* | — |
| EDTA | ||||
| 15.6 | — | — | — | 19.77 ± 3.31* |
Abbreviation: ND, not detected.
*
—Statistically significance (p < 0.05) when compared to control (without extract).