Table 2.
IC50 and correlation coefficient (r) of the hydro-ethanolic leaf and bark extracts in DPPH, ABTS assay, and the ferric reducing power activity in the FRAP assay.
| Test | Parameters | Inhibitors | ||
|---|---|---|---|---|
| Standard | Bark | Leaf | ||
| DPPH | IC50 (μg/ml) | 71.98 ± 1.21 | 115.40 ± 5.97∗∗∗ | 59.09 ± 6.37∗∗∗† |
| R2 | 0.9910 | 0.9995 | 0.9898 | |
|
| ||||
| ABTS | IC50 (μg/ml) | 33.48 ± 2.02 | 354.2 ± 1.97∗∗∗ | 262.4 ± 4.46∗∗∗† |
| R2 | 0.9984 | 0.9986 | 0.9937 | |
|
| ||||
| FRAP | mg CE/g of extract | 150.30 ± 0.32 | 341.73 ± 21.70† | |
Data are expressed as mean ± SD, n = 3; significantly different at ∗∗∗p < 0.001 when compared to standards (ascorbic acid in the DPPH test and catechin in the ABTS test); mg CE/g of extract: milligrams of catechin equivalent per gram of extract. †p < 0.001 compared to bark extract.