Journal
RSC ADVANCES
Volume 6, Issue 3, Pages 1722-1728Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra22682a
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- Japan Society for the Promotion of Science (JSPS)
- Ministry of Human Resource Development, New Delhi
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The electrochemical oxidation of 8-hydroxydeoxyguanosine (8-OHdG) has been studied at the edge plane surface of a pyrolytic graphite electrode (EPPGE) by cyclic sweep, square wave voltammetry, spectral studies, controlled potential electrolysis and related techniques. The oxidation of 8-OHdG occurred in a single well-defined peak over the entire pH range. The effect of pH revealed that the oxidation of 8-OHdG involved an equal number of electrons and protons. The 8-OHdG exhibited a linear calibration curve over a concentration range of 0.5-100 mu M and the detection limit and sensitivity are found to be 28 x 10(-9) M and 1.068 mu A mu M-1 respectively. The kinetics of the decay of the UV-absorbing intermediate generated during oxidation has been studied and the decay has been found to follow first order kinetics having a rate constant (k) in the range similar to 2.5 x 10 (3) s (1). The products of electrochemical oxidation have been characterized by using GC-MS studies. A tentative mechanism for the oxidation of 8-OHdG has also been suggested.
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