Abstract
AbstractThe electrochemical redox mechanism of polyphenolic compounds (gallic acid [GA], caffeic acid [CA], ferulic acid [FA], and vanillic acid [VA]) were investigated by electrochemical methods at the inlaid multi-walled carbon nanotubes-modified graphite electrode (MWCNTs/GCE). The obtained micro-information such as the number of electrons and protons were used to deduce the electrochemical oxidation mechanism of four polyphenolic compounds. The antioxidation activities of these compounds were also studied by two methods. The radical scavenging activity followed the order: GA > CA > FA > VA, which was in agreement with the result from the spectrophotometry method. The result indicated that compounds with lower oxidation peak potential (Epa) showed stronger antioxidation activity. At the same time, compounds with highEpashowed lower antioxidant activity. The greater the number of hydroxyls linked to the aromatic ring, the greater the antioxidation activities of four compounds. Structural analysis of these phenolic-based compounds suggested that multiple OH substitutions and conjugations determine their free radical scavenging activity and electrochemical behavior.
Highlights
The electrochemical redox mechanism of polyphenolic compounds were investigated by electrochemical methods at the inlaid multi-walled carbon nanotubes-modified graphite electrode (MWCNTs/ GCE)
The mirror side was carefully polished for about 15 min using functionalized MWCNTs on parchment paper to embed MWCNTs uniformly on the electrode surface and the inlaid MWCNTs/ GE were obtained
The antioxidation activity of four polyphenolic compounds was investigated by the electrochemical analysis method and spectrophotometry [32]
Summary
Abstract: The electrochemical redox mechanism of polyphenolic compounds (gallic acid [GA], caffeic acid [CA], ferulic acid [FA], and vanillic acid [VA]) were investigated by electrochemical methods at the inlaid multi-walled carbon nanotubes-modified graphite electrode (MWCNTs/ GCE). Electrochemical techniques are versatile and powerful analytical tools, which have the benefit of high sensitivity, low detection limits, low cost, and enable rapid analysis of sample [15,16] In addition to their fundamental science applications to study oxidation and reduction reactions and their mechanism, they are used for kinetic and thermodynamic studies as well as to understand electron and ion transfer [17,18]. The graphite electrode modified with an MWCNTs coating and CV were used to study the electrochemical redox mechanism of four polyphenolic compounds Their antioxidation properties were assessed based on their redox potentials. Spectrum pure graphite rod (0.6 cm in diameter) was from Qingdao Tengrui Carbon Co., Ltd
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