ELECTROCATALYSIS OF OXYGEN AT HEMOGLOBIN-AU COLLOID-1,4-BENZENEDIMETHANETHIOL MODIFIED ELECTRODE

摘要

A novel renewable O_2 sensor based on the direct electron transfer of hemoglobin (Hb) is proposed.Hb was immobilized on a gold nanoparticles (GNP) associated with a 1,4-benzenedimethanethiol (BDT) monolayer which were modified the electrode.The direct electrochemistry of Hb was investigated by electrochemical methods and cyclic voltammetric showing a pair of redox peaks of Hb.The high efficiency of the Hb/GNP/BDT modified gold electrode towards the catalytic electro-reduction of oxygen has been observed and the potential application of Hb/GNP/BDT modified gold electrode as biosensors to monitor O_2 is proposed.The electrocatalytic response showed a linear dependence on the O_2 concentration ranging from 2.0 to 40.0 mu mol/L.