Table 2.
IC50 values of antioxidant activities of black rice leaf crude extract and fractions.
| Fractions | DPPH• (µg/L) |
ABTS•+ (µg/L) |
Reducing Power (µg/L) |
|---|---|---|---|
| Crude ethanolic extract | 9.77 ± 0.06 e | 175.30 ± 0.69 d | 324.74 ± 1.51 e |
| Hexane | 57.13 ± 0.24 a | 627.74 ± 1.68 a | 1253.67 ± 3.76 a |
| Ethyl acetate | 32.79 ± 0.09 b | 273.65 ± 1.05 b | 682.06 ± 2.02 b |
| Normal butanol | 15.64 ± 0.09 d | 212.75 ± 0.78 c | 332.00 ± 1.28 d |
| Aqueous | 32.28 ± 0.23 c | 213.16 ± 0.37 c | 405.27 ± 0.76 c |
| BHA | 4.46 ± 0.06 f | nd | nd |
| Trolox | nd | 52.04 ± 0.10 e | nd |
| Ascorbic acid | nd | nd | 49.63 ± 0.66 f |
BHA: butylated hydroxyanisole; trolox: 6-hydroxy-2,5,7,8-tetramethylchroman-2-carboxylic acid. Values are displayed as mean ± SD (n = 3). Means within the same column with various superscripts illustrate significant differences (p < 0.05). nd: not detected.