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Ryan, P,Hynes, MJ
2008
January
Journal Of Inorganic Biochemistry
The kinetics and mechanisms of the reactions of iron(III) with quercetin and morin
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kinetics mechanisms quercetin morin flavonoids electron transfer iron dimer MULTIWAVELENGTH SPECTROSCOPIC DATA COMPUTERIZED DATA ACQUISITION CORONARY-HEART-DISEASE AQUEOUS ACID SOLUTION METHANOL-WATER 70-30 COMPLEX-FORMATION SPECTROPHOTOMETRIC ANALYSIS EQUILIBRIUM-CONSTANTS AUTOMATIC TITRATION STEPWISE ADDITION
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The kinetics and mechanisms of the reactions of a pseudo-first order excess of iron(III) with the flavonoids quercetin and morin have been investigated in aqueous solution at 25 degrees C and an ionic strength of 0.5 M. Mechanisms have been proposed which account satisfactorily for the kinetic data. The data are consistent with a mechanism in which the metal:ligand complex formed initially on reaction of iron(III) with the ligand subsequently decomposes through an electron transfer step. Morin forms a 1: 1 metal:ligand complex while quercetin forms a 2:1 metal:ligand complex. Both ligands showed evidence for the involvement of the iron hydroxo dimer Fe-2(OH)(2)(4+) in the complex formation reaction at the hydroxy-carbonyl moiety. The iron(III) assisted decomposition of the initial iron(III) complex formed was also investigated and the rate constants evaluated. Both the complex formation and subsequent electron transfer reactions of iron(111) with these ligands were monitored using UV-visible spectrophotometry. All of the suggested mechanisms and calculated rate constants are supported by calculations carried out using global analysis of time dependant spectra. (c) 2007 Elsevier Inc. All rights reserved.
DOI 10.1016/j.jinorgbio.2007.07.041
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