10.1021/jp4097259.s001
Yu-Jiao Chen
Yu-Jiao
Chen
Ning Deng
Ning
Deng
Bin Hu
Bin
Hu
Yan Wang
Yan
Wang
Jian-Bo He
Jian-Bo
He
Thin Layer-Based
Spectral and Electrophoretic Study
of Electro-Oxidation of Solid Ellagic Acid
American Chemical Society
2014
UV
electrochemical
ellagic acid
pH
media
potential
oxidation products
Solid Ellagic AcidAcquisition
electrophoretic electrochemistry
2014-02-27 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Thin_Layer_Based_Spectral_and_Electrophoretic_Study_of_Electro_Oxidation_of_Solid_Ellagic_Acid/2319331
Acquisition
of data from both in situ spectroscopy detection and
online chromatography-like separation is important for studying complex
electrochemical reactions. The present work provides an example of
combination of thin-layer spectral and electrophoretic electrochemistry,
both based on thin-layer electrolysis. Two thin-layer electrochemical
cells were used to investigate the electro-oxidation of solid ellagic
acid at different potentials, in acidic, physiological, and alkaline
buffer media. UV–vis spectra and cyclic voltabsorptograms of
the oxidation products were recorded in situ without interference
from the solid reactant. Four oxidation products, depending upon the
buffer pH and the applied potential, were separated and detected by
electrophoretic electrochemistry. The major products possess redox
stability, possibly with a diquinonemethide structure. The minor product
is considered as an <i>o</i>-quinone derivative with a lactone-ring-opening,
which can be reduced or further oxidized at appropriate potentials.
A consecutive-parallel reaction mechanism is proposed for the formation
of four products of ellagic acid in different pH media, which enriches
the knowledge about the oxidation pathway and antioxidant property
of this biologically active polyphenol compound.