Mechanism of Chicoric Acid Electrochemical Oxidation and Identification of Oxidation Products by Liquid Chromatography and Mass Spectrometry
Electrochemical oxidation of chicoric acid (ChA) was investigated using cyclic voltammetry and chronoamperometry at a glassy carbon electrode. Chicoric acid generates single quasi‐reversible redox wave in cyclic voltammetry over a wide pH range, and an ECEC‐dimerization mechanism is proposed. Effect...
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| Published in | Electroanalysis (New York, N.Y.) Vol. 29; no. 3; pp. 850 - 860 |
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| Format | Journal Article |
| Language | English |
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01.03.2017
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| Abstract | Electrochemical oxidation of chicoric acid (ChA) was investigated using cyclic voltammetry and chronoamperometry at a glassy carbon electrode. Chicoric acid generates single quasi‐reversible redox wave in cyclic voltammetry over a wide pH range, and an ECEC‐dimerization mechanism is proposed. Effect of glutathione (GSH) on the electrochemical oxidation of chicoric acid (ChA) was investigated in Britton−Robinson buffer solution. Ultra‐high performance liquid chromatography (UPLC) coupled with mass spectrometry (MS) was used to show that the naturally occurring chicoric acid (ChA) underwent an electrochemical oxidation in the presence of glutathione (GSH) to form mono‐, bi‐, tri‐, and four‐glutathione conjugates of chicoric acid and a mono‐glutathione conjugate of a chicoric acid dimer. The obtained results are useful for understanding and predicting the oxidative degradation pathway of chicoric acid. |
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| AbstractList | Electrochemical oxidation of chicoric acid (ChA) was investigated using cyclic voltammetry and chronoamperometry at a glassy carbon electrode. Chicoric acid generates single quasi-reversible redox wave in cyclic voltammetry over a wide pH range, and an ECEC-dimerization mechanism is proposed. Effect of glutathione (GSH) on the electrochemical oxidation of chicoric acid (ChA) was investigated in Britton-Robinson buffer solution. Ultra-high performance liquid chromatography (UPLC) coupled with mass spectrometry (MS) was used to show that the naturally occurring chicoric acid (ChA) underwent an electrochemical oxidation in the presence of glutathione (GSH) to form mono-, bi-, tri-, and four-glutathione conjugates of chicoric acid and a mono-glutathione conjugate of a chicoric acid dimer. The obtained results are useful for understanding and predicting the oxidative degradation pathway of chicoric acid. Electrochemical oxidation of chicoric acid (ChA) was investigated using cyclic voltammetry and chronoamperometry at a glassy carbon electrode. Chicoric acid generates single quasi‐reversible redox wave in cyclic voltammetry over a wide pH range, and an ECEC‐dimerization mechanism is proposed. Effect of glutathione (GSH) on the electrochemical oxidation of chicoric acid (ChA) was investigated in Britton−Robinson buffer solution. Ultra‐high performance liquid chromatography (UPLC) coupled with mass spectrometry (MS) was used to show that the naturally occurring chicoric acid (ChA) underwent an electrochemical oxidation in the presence of glutathione (GSH) to form mono‐, bi‐, tri‐, and four‐glutathione conjugates of chicoric acid and a mono‐glutathione conjugate of a chicoric acid dimer. The obtained results are useful for understanding and predicting the oxidative degradation pathway of chicoric acid. Abstract Electrochemical oxidation of chicoric acid (ChA) was investigated using cyclic voltammetry and chronoamperometry at a glassy carbon electrode. Chicoric acid generates single quasi‐reversible redox wave in cyclic voltammetry over a wide pH range, and an ECEC‐dimerization mechanism is proposed. Effect of glutathione (GSH) on the electrochemical oxidation of chicoric acid (ChA) was investigated in Britton−Robinson buffer solution. Ultra‐high performance liquid chromatography (UPLC) coupled with mass spectrometry (MS) was used to show that the naturally occurring chicoric acid (ChA) underwent an electrochemical oxidation in the presence of glutathione (GSH) to form mono‐, bi‐, tri‐, and four‐glutathione conjugates of chicoric acid and a mono‐glutathione conjugate of a chicoric acid dimer. The obtained results are useful for understanding and predicting the oxidative degradation pathway of chicoric acid. |
| Author | Abdel‐Hamid, Refat Kilmartin, Paul A. Newair, Emad F. |
| Author_xml | – sequence: 1 givenname: Emad F. surname: Newair fullname: Newair, Emad F. email: emad.newair@science.sohag.edu.eg, newair.emad@gmail.com organization: University of Sohag – sequence: 2 givenname: Refat surname: Abdel‐Hamid fullname: Abdel‐Hamid, Refat organization: University of Sohag – sequence: 3 givenname: Paul A. surname: Kilmartin fullname: Kilmartin, Paul A. organization: University of Auckland |
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| Snippet | Electrochemical oxidation of chicoric acid (ChA) was investigated using cyclic voltammetry and chronoamperometry at a glassy carbon electrode. Chicoric acid... Abstract Electrochemical oxidation of chicoric acid (ChA) was investigated using cyclic voltammetry and chronoamperometry at a glassy carbon electrode.... |
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| SubjectTerms | Buffer solutions Chicoric acid Conjugates Cyclic voltammetry Electrochemical oxidation Electrodes Electrolysis Glutathione Glutathione conjugates Liquid chromatography Mass spectrometry Oxidation Mechanism Voltammetry |
| Title | Mechanism of Chicoric Acid Electrochemical Oxidation and Identification of Oxidation Products by Liquid Chromatography and Mass Spectrometry |
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