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Electrocatalytic oxidation of guanine in DNA was detected at tin-doped indium oxide electrodes modified with nylon and nitrocellulose polymers. The catalytic oxidation occurs via oxidation at the electrode of the complex Ru(bpy) 32+ to the 3+ state, which is then reduced back to the 2+ state by guanine in DNA (bpy = 2,2′-bipyridine). Catalysis is observed as a current enhancement in the cyclic voltammogram...
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