Table 3.
Parameters of flavonoid–oxidant interactions: DPPH reduction, flavonoid autoxidation, inhibition of HOCl-induced hemolysis, and water solubility of flavonoids
| Parameters | Quercetin | Catechin | Naringenin |
|---|---|---|---|
| Apparent reaction rate of DPPH reduction, s−1 (20 °C) | 0.34 ± 0.06 | 0.09 ± 0.02 | – |
| Activation energy of reduction, kJ/mol (10 µM flavonoid) | 23.0 ± 2.5 | 32.5 ± 2.5 | – |
| Reduction stoichiometry | 1.05 ± 0.05 | 0.99 ± 0.05 | – |
| Activation energy of autoxidation, kJ/mol (50 µM flavonoid) | 50.8 ± 6.1 | 58.1 ± 7.2 | – |
| IC50 for hemolysis inhibition, μM | 1.0 ± 0.2 | 1.1 ± 0.2 | 1.2 ± 0.2 |
| Water solubility, mg/l | 0.512 [26] | 2260 [27] | 4.38 [28] |