Электрокаталитический отклик цистеина на графитовых электродах, модифицированных наночастицами золота

The electrochemical behavior of cysteine at a graphite electrodes modified with gold nanoparticles was studied by cyclic voltammetry. Specific feature of the electrooxidation of cystein at a graphite electrodes modified with gold nanoparticles and at a graphite electrodes modified from solution HAuCl4. The condition for the detection of an electrocatalytic signal in the oxidation of cystein at the graphite electrode modified with gold particles were determined. It was found that graphite electrodes modified with gold nanoparticles are more electrocatalytic activity toward the oxidation of cysteine than single crystals of gold due to the increase in the number of atoms on the surface of the graphite electrode in comparison with single crystals of gold, which catalyze the oxidation process of cystein. Perfomance characteristics of the electrocatalytic determination of cysteine at a graphite electrodes modified with gold nanoparticles were determined. The use of graphite electrode modified with gold nanoparticles reduces the detection limit for cystein under to 1•10-12 М. A graphite electrode electrochemically modified with gold film from solution of HAuCl4, allows to define up to a 1•10-8M.