Sheela, B. and Vijayavalli, R.
(1990)
Electrochemical reduction of alloxan monohydrate on HMDE.
Bulletin of Electrochemistry, 06 (06).
pp. 643-645.
ISSN 0256-1654
Abstract
Alloxan monohydrate (AM) is a fully oxygenated pyrimidine and has been the subject of intensive study owing to its importance in biological systems. The hydrated carbonyl group in the 5th position is known to be active functional group. The electrochemical reduction of AM has been investigated by cyclic voltammetric technique using HMDE at pH 1.0 to 5.0 using acetate buffer. The range of potential scan employed was from +200 mV to -1.5V vs SCE and the scan rate was varied from 10 mV.s^-1 to 640 mV.s^-1 and the experiments were carried out in nitrogen atmosphere. Two reduction peaks PCI and PCII were observed around 40 mV-200 mV and around -850 mV to -900 mV vs SCE depending upon the pH. On the anodic side also two peaks were observed. All the peaks were dependent on pH and scan rate. At low pH, PCI was a plateau while PaI was absent. The reduction reaction was found to occur in two stages, namely, dehydration of AM followed by its reduction to dialuric acid at low pH, whereas at high pH this two stage reduction and reduction of dehydrated alloxan compete with each other. The product formed was confirmed by U.V. & I.R.
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