Abstract
The electrochemical behaviour of cysteine and cystine on graphite electrodes modified by adsorbed transition metal phthalocyanines has been studied by cyclic voltammetry and the rotating disc technique. For the electro-oxidation of cysteine the catalytic activity of metal tetrasulfonated phthalocyanines decreases as follows: Co > Fe > Mn > Ni > Cu. Volcano graphs are obtained when the catalytic activity is plotted versus the number of d-electrons in the metal. For the electroreduction of cystine the catalytic activity decreases as follows: Mn > Fe > Co > Cu > Ni. The activity varies almost linearly with the number of d-electrons in the metal.
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