Table 3.
IC50 values in antioxidant properties of water and hydroalcoholic extracts (80% ethanol extracts) of fermented glutinous rice with Fu brick tea (FGR-FBT) and traditional fermented glutinous rice (FGR).
| FGR-FBT | FGR | |||
|---|---|---|---|---|
| Water Extracts | Hydroalcoholic Extracts | Water Extracts | Hydroalcoholic Extracts | |
| ABTS·+ | 30.67 ± 0.29 c | 10.75 ± 0.24 d | 257.71 ± 4.82 a | 224.55 ± 3.63 b |
| DPPH | 17.26 ± 0.30 c | 15.97 ± 0.21 d | 132.75 ± 3.09 a | 114.83 ± 4.43 b |
| FRAP | 26.61 ± 2.43 c | 13.23 ± 1.87 d | 351.67 ± 26.62 a | 319.04 ± 32.92 b |
| Reducing power | 265.61 ± 10.69 b | 126.42 ± 3.83 c | 1654.89 ± 24.26 a | 1648.89 ± 8.19 a |
| Fe2+ chelating * | 498.43 ± 13.75 d | 705.47 ± 55.92 c | 1679.88 ± 67.05 b | 1893.39 ± 64.13 a |
| ·OH * | 969.79 ± 17.49 a | 292.19 ± 4.03 b | nd | nd |
IC50 value: the effective concentration at which the radical is scavenged by 50% or where absorbance is 0.5 for reducing power. IC50 values were obtained by interpolation from linear regression analysis. * indicates that the IC50 values of Fe2+-chelating capability and hydroxyl radical-scavenging activities were calculated by extrapolation from linear regression analysis. “nd” indicates that no IC50 values could be calculated. Different lowercase letters (a, b, c and d) within a row indicate significant differences (p < 0.05).