Table 2.
Comparison of the antioxidant and free radical scavenging capacities of 70% methanol extract of E. tuba and standard reference compounds
| Name of assay | ETME | Standard | Values of standard compounds |
|---|---|---|---|
| TEAC Values | 0.202 ± 0.001 | - | - |
| *IC50 values of the extracts for free radical scavenging capacity for | |||
| DPPH | 146.07 ± 1.80 | Ascorbic acid | 5.29 ± 0.28*** |
| Hydroxyl radical (OH•) scavenging | 41.89 ± 0.41 | Mannitol | 571.45 ± 20.12*** |
| Lipid peroxidation | 202.49 ± 33.32 | Trolox | 6.76 ± 0.17*** |
| Superoxide anion (O2 •-) scavenging | 5.83 ± 0.07 | Quercetin | 42.06 ± 1.35*** |
| Hydrogen peroxide (H2O2) scavenging | 47.34 ± 5.05 | Sodium pyruvate | 3.24 ± 0.30*** |
| Nitric oxide radical (NO) scavenging | 278.46 ± 15.02 | Curcumin | 90.82 ± 4.75*** |
| Peroxynitrite (ONOO-) scavenging | 2.821 ± 1.69 | Gallic acid | 0.876 ± 0.57*** |
| Singlet oxygen (1O2) scavenging | 0.879 ± 0.29 | Lipoic acid | 0.046 ± 0.01*** |
| Hypochlorous acid (HOCl) scavenging | 223.25 ± 4.19 | Ascorbic acid | 235.96 ± 5.75** |
*IC50 Values are in μg/ml (except for Hydrogen peroxide, Peroxynitrite and Singlet oxygen scavenging assay where values are expressed in mg/ml). Each value represents mean ± S.D. (n = 6). ***p < 0.001, **p < 0.01 vs ETME.