Voltammetric, chromatographic and mass spectral elucidation of the redox reactions of 1-hydroxypyrene occurring at a screen-printed carbon electrode |
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| Authors: | Kevin C Honeychurch Nicole Kirsch |
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| Affiliation: | Faculty of Applied Sciences, Centre for Research in Analytical, Materials and Sensors Science, University of the West of England, Bristol, Frenchay Campus, Coldharbour Lane, Bristol BS16 1QY, UK |
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| Abstract: | The electrochemical oxidation of 1-hydroxypyrene (1-OHP) has been studied at a screen-printed carbon electrode (SPCE), by cyclic voltammetry and bulk electrolysis. Cyclic voltammograms exhibited two quasi-reversible pairs of peaks (designated 1a′/1c and 3a/3c) generated from the oxidation of the parent molecule. The nature of the redox reactions were further investigated by observing the effect of scan rate and pH on the voltammetric behaviour; the results suggested that the oxidation reactions giving rise to peaks 1a and 2a involved electrochemical-chemical-electrochemical (ECE) and EECE processes, respectively. Additional studies were carried out by HPLC and GC/MS and the results strongly indicated that the oxidation products were a mixture of several pyrene-quinones. In addition, liquid chromatography/mass spectroscopy (LC/MS) investigations showed that 1-OHP had undergone oxidation reactions to produce several dimers. |
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| Keywords: | 1-Hydroxypyrene Screen-printed carbon electrode LC/MS GC/MS Dimer Quinones |
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