Table 2.
IC50 in DPPH radical scavenging activity.
| Extracts | IC50 (μg/mL) |
|---|---|
| Water | 679.67 ± 1.4i |
| Methanol | |
| 100% (M) | 95.68 ± 0.8e |
| 75% aqueous methanol (M3) | 80.98 ± 2.5c |
| 50% aqueous methanol (M1) | 137.85 ± 0.4h |
| Ethanol | |
| 100% (E) | 70.06 ± 1.0a |
| 75% aqueous ethanol (E3) | 106.18 ± 1.2f |
| 50% aqueous ethanol (E1) | 109.97 ± 1.0fg |
| Acetone | |
| 100% (A) | 88.06 ± 1.3d |
| 75% aqueous acetone (A3) | 79.98 ± 1.6b |
| 50% aqueous acetone (A1) | 110.36 ± 0.24g |
| Gallic acid1† | 2.6 |
| Ascorbic acid† | 8.4 |
Different superscripted letters (a–i) indicate significant difference from one another (p > 0.05).
DPPH = 2,2-diphenyl-1-picrylhydrazyl; IC50 = half-maximal inhibitory concentration.
†
The IC50 values of gallic acid and ascorbic acid as controls were taken from “Antioxidant activity and total phenolic content of some Brazilian species”, by Brighente IMC, Dias M, Verdi LG, et al. 2007, Pharm Biol 45, p. 156–61. Copyright 2007, Informa Healthcare. Reprinted with permission.