Electrochemical Oxidation Mechanisms of the Antioxidants Daidzein and 7-Hydroxy-4-chromone

Autor:	Saeed Shahrokhian, Ana Maria Oliveira-Brett, Isabel P.G. Fernandes, Masoumeh Ghalkhani, Severino Carlos B. Oliveira
Rok vydání:	2012
Předmět:	Detection limit Diffusion Phosphate buffered saline Daidzein Inorganic chemistry Glassy carbon electrode Single step Electrochemistry Analytical Chemistry chemistry.chemical_compound chemistry Organic chemistry 4-chromone
Zdroj:	Electroanalysis. 24:618-626
ISSN:	1040-0397
DOI:	10.1002/elan.201100629
Popis:	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 pH 7.0 phosphate buffer to be DDZ = 8.1 � 10 � 5 cm 2 s � 1 . The detection limits of DZ and 7-OH-4-CHM was calculated as LODDZ = 0.08 mM and LOD7-OH-4-CHM = 0.13 mM.
Databáze:	OpenAIRE
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