A carbon glassy electrode modified by gold nanoparticles was prepared.The elect-rochemical behavior of hemoglobin on the modified electrode was investigated and it was found that the modified electrode has an obvious electrocatalytic effects on the hemoglobin.The electrode shows a linear range of ipa(μA)=0.0981+2.7169c for hemoglobin in a HAcNaAc buffer medium of pH 4.6.The relative standard deviation for eight determinations of 1×10-5mol/L hemoglobin is 0.85 %.The modified electrode shows excellent stability and reproducibility.
Mechanisms of electron transfer of carbazole （CZ） and 9-ethylcarbazole （ECZ） were studied by electrochemistry and in-situ spectroelectrochemistry. The result indicated that the electrochemical reaction mechanism of ECZ was the same as that of CZ. Both of them undergo ECE process： the initial step is removal of one electron to generate very reactive cation radical, this species then proceeded by deprotonation-coupling reaction to form the corresponding dimer, which was oxidized continuously.
Zi Pin ZHANG Bao Kang JIN Yu Peng TIAN Shi Jun WANG
