Electroanalytical Oxidation ofp‐Coumaric Acid
- 1 December 2007
- journal article
- research article
- Published by Taylor & Francis in Analytical Letters
- Vol. 40 (17), 3309-3321
- https://doi.org/10.1080/00032710701672822
Abstract
The mechanism of the electrochemical oxidation of p‐coumaric acid on a glassy carbon electrode was investigated using cyclic, differential pulse, and square wave voltammetry at different pHs. The oxidation of p‐coumaric acid is irreversible over the whole pH range. After successive scans, the p‐coumaric acid oxidation product deposits on the electrode surface, forming a polymeric film that undergoes reversible oxidation at a lower potential than p‐coumaric acid. This polymeric film increases in thickness with the number of scans, covering the electrode surface, and impeding the diffusion of the p‐coumaric acid and its oxidation on the electrode. The oxidation of p‐coumaric acid is pH dependent up until values close to the pKa. For pHs higher than pKa, the p‐coumaric acid oxidation process is pH independent. An electroanalytical determination procedure of p‐coumaric in pH 8.7 0.2 M ammonium buffer was developed, and a detection limit, LOD=83 nM, and the limit of quantification, LOQ=250 nM, were obtained.Keywords
This publication has 23 references indexed in Scilit:
- On the Electrochemical Oxidation of ResveratrolElectroanalysis, 2006
- Solid State Electrochemical Oxidation Mechanisms Of Morin in Aqueous MediaElectroanalysis, 2005
- Electrochemical Oxidation of RutinElectroanalysis, 2005
- Catechin electrochemical oxidation mechanismsAnalytica Chimica Acta, 2004
- Electrochemical Oxidation of QuercetinElectroanalysis, 2003
- Electrochemistry of Caffeic Acid Aqueous Solutions with pH 2.0 to 8.5Journal of the Brazilian Chemical Society, 2002
- Unusually large numbers of electrons for the oxidation of polyphenolic antioxidantsBiochimica et Biophysica Acta (BBA) - General Subjects, 2001
- The use of cyclic voltammetry for the evaluation of antioxidant capacityFree Radical Biology & Medicine, 2000
- Oxidation of caffeic acid and related hydroxycinnamic acidsJournal of Electroanalytical Chemistry, 1996
- Occurrence and content of hydroxycinnamic and hydroxybenzoic acid compounds in foodsCritical Reviews in Food Science and Nutrition, 1989