Table 2.
Antioxidant activities of Zataria multiflora and Otostegia persica extracts and their fractions.
| Samples | DPPH radical scavenging (IC50 μg/ml) |
Reducing power (concentrations with absorbance 0.5) |
|---|---|---|
| Ethanol extractof Zm | 90.73 ± 2.92c | 4.15 ± 0.013c |
| Petroleum ether fraction of Zm | 883.26 ± 2.18f | 5.83 ± 0.20d |
| Chloroform fraction of Zm | 440.75 ± 3.09e | 11.36 ± 0.07f |
| Ethyl acetate fraction of Zm | 32.17 ± 1.82b | 3.05 ± 0.51b |
| Butanol fraction of Zm | 393.78 ± 1.55d | 7.57 ± 0.24e |
|
| ||
| Ethanol extract of Op | 166.09 ± 2.11b | 64.33 ± 1.15c |
| Petroleum ether fraction of Op | 1578.89 ± 4.23f | 248.57 ± 2.85f |
| Chloroform fraction of Op | 1139.5 ± 3.11e | 130.74 ± 2.31e |
| Ethyl acetate fraction of Op | 635.65 ± 3.67c | 38.66 ± 2.08b |
| Butanol fraction of Op | 691.32 ± 4.71d | 103.66 ± 1.52d |
| Quercetin | 26.28 ± 2.68a | ND |
| Gallic acid | ND | 2.75 ± 0.261a |
ND: nondetermined, Zm: Zataria multiflora, Op: Otostegia persica; statistical differences shown as alphabetic letters. The same alphabetic letters implied there are no statistical differences, p > 0.05, and different letters represented statistical differences, p < 0.05.