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. Author manuscript; available in PMC: 2009 Feb 20.
Published in final edited form as: Dalton Trans. 2007 Oct 2;(43):4951–4961. doi: 10.1039/b705136k

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
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