DNA Immobilization on Nano-Gold Modified Glassy Carbon Electrode

CT-DNA were electrochemically immobilized on the surfaces of both nano-goldmodified glassy carbon electrode and bare glassy carbon electrode. The cyclic voltammetricbehavior of Co (phen)33 adsorbed on the immobilized DNA was studied. Increase in the peakcurrent of Co (phen)33 redox reaction was obtained on nano-gold modified glassy carbon electrode.The result suggests that more DNA molecules were immobilized on this electrode and nano-goldmodification can enhance the heterogeneous electron transfer rate constant of the Co (phen)33 .