Table 1.
Estimated conditional binding constants with Fe2+ in 20 mM KPB, pH 7.2 at 25 °C
Fe2+/flavonoid | Kapp by approach 1 | Kapp by approach 2 |
---|---|---|
Quercetin (1 : 1 complex) | 2 × 106/M | 7 × 106/M |
Quercetin (1 : 2 complex) | 5 × 1010/M2 | Not determined |
3-Hydroxyflavone (1 : 2 complex) | 2 × 1011/M2 | 2 × 1011/M2 |
Chrysin (1 : 2 complex) | 8 × 1010/M2 | Not determined |
3′,4′-Dihydroxyflavone (1 : 2 complex) | 3 × 1010/M2 | 2 × 1011/M2 |
Rutin (1 : 2 complex) | 4 × 1011/M2 | 1 × 1012/M2 |