Abstract
The electrochemical oxidation of deoxyribonucleic acid (DNA) at carbon electrodes was studied with the aid of differential pulse and linear sweep voltammetry. It was found that oxidation currents of NDA are increased if the molecular weight of DNA is substantially lowered. Moreover, the effect of the presence of low-molecular weight components of DNA (oxidizable at carbon electrodes) in DNA samples on the oxidation currents of DNA was also studied. It was demonstrated that these components, of DNA was also studied. It was demonstrated that these components, even at a relatively very low concentration (micromolar), can significantly influence the results of the study of DNA electrooxidation. It was suggested that the obtaining of different results from the study of electrooxidation of DNA at carbon electrodes by us [ e.g., J. Electroanal. Chem. Interfacial Electrochem. 89, (1978) 161] and by Yao et al., [ Bull. Chem. Soc. Japan 51, (1978) 1235] was probably connected with the different degree of degradation of DNA samples studied.
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