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Modified electrodes with molecular films of a tetraruthenated cobalt-porphyrin complex have been employed in the amperometric detection of NADH and dopamine. The electrochemical oxidation of these bioanalytes can be monitored at the onset of the Ru(III/II) redox wave (E°=0.70 V vs Ag/AgCl), exhibiting a very sharp peak consistent with a rapid and efficient electron transfer process. Because of the...