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A novel disulphide derivatised deuteroporphyrin 2,7,12,18-tetramethyl-13,17-(propionylaminoethyldithioethyl amino-formylethyl)-29,34-bis-(methoxyformyl)porphyrin (PDTEP.3) and its cobalt(Ⅱ) complex (Co(Ⅱ)PDTEP.4) were conveniently synthesized.The disulphide functional group of 4 allowed its stable immobilization on gold electrodes.The modified electrode was characterized by IR and confirmed electrochemically and showed good stability and catalytic activity toward the electro-catalyzed reduction of hydrogen peroxide.