Redox Couple of DNA on Multiwalled Carbon Nanotube Modified Electrode

It has been envisioned that carbon nanotubes could promote electron‐transfer reactions when used as electrode materials in electrochemical cells. In the present study, calf thymus DNA was electrochemically oxidized at an electrode modified with multiwalled carbon nanotubes. The potentials for DNA oxidation at pH 7.0 were found to be 0.71 and 0.81 V versus SCE, corresponding to the oxidation of guanine and adenine residues, respectively. An initial oxidation of adenine was observed in the first scan, which was followed by a quasi‐reversible redox process of the oxidation product in the subsequent scans.