Table 3.
Antioxidant activity (%) of crude and fractionated extracts at various concentrations assayed by β-carotene bleaching assay
|
Concentrations (mg/ml) |
Antioxidant activity of crude methanol extract and its fractions |
|
|||
|---|---|---|---|---|---|
| Methanol extract | Hexane fraction | Ethyl acetate fraction | Water fraction | BHA | |
|
4 |
66.06 ±0.63dw |
23.92 ±4.46aw |
59.64 ± 1.44cw |
50.03 ± 2.67bw |
81.51 ± 0.67ew |
|
8 |
74.73 ±1.84cx |
42.17 ± 3.41ax |
72.35 ± 2.30cx |
57.54 ± 1.83bx |
84.50 ± 0.21dx |
|
16 |
77.84 ±0.41cy |
52.62 ± 2.21ay |
72.87 ± 1.73bx |
71.74 ± 1.80by |
89.54 ± 0.27dy |
| 20 | 81.21 ±0.91cz | 56.80 ± 2.70ay | 74.51 ± 0.53bx | 74.79 ± 1.56by | 92.92 ± 0.23dz |
Values expressed are mean ± standard deviation of triplicate measurements. For the same extract or standard with different concentrations, means in the same column with different letters (w-z) were significantly different (p < 0.05, ANOVA). For different extracts with the same concentration, means in the same row with different letters (a-e) were significantly different (p < 0.05, ANOVA). BHA was used as the standard.