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    Electrochemical oxidation mechanisms of the antioxidants daidzein and 7-Hydroxy-4-chromone

    , Article Electroanalysis ; Volume 24, Issue 3 , 2012 , Pages 618-626 ; 10400397 (ISSN) Fernandes, I. P. G ; Oliveira, S. C. B ; Ghalkhani, M ; Shahrokhian, S ; Oliveira Brett, A. M ; Sharif University of Technology
    The electrochemical behavior of antioxidants daidzein (DZ) and 7-hydroxy-4-chromone (7-OH-4-CHM) was investigated. The oxidation of DZ is irreversible, pH-dependent, and occurs in two steps, the first of 4′-OH on the B-ring and the second on the 7-OH on the A-ring. The oxidation of 7-OH-4-CHM occurs on the 7-OH on the A-ring, is irreversible, pH-dependent and proceeds in a single step. The DZ diffusion coefficient was calculated in pH7.0 phosphate buffer to be D DZ=8.1×10 -5cm 2s -1. The detection limits of DZ and 7-OH-4-CHM was calculated as LOD DZ=0.08μM and LOD 7-OH-4-CHM=0.13μM