Detection of Direct Electron Transfer between a Redox Enzyme and an Extended Gold-Gate Using Chemical CCD

抄録

PQQ-dependent fructose dehydrogenase (PQQ-FDH), which is able to transfer electrons to metal electrodes, was immobilized onto an extended gold-gate of a chemical charge-coupled device (chemical CCD) to measure the catalytic electron transfer in the presence of the substrate. Rapid decrease of the output voltage of the FDH-immobilized gold-gate chemical CCD was observed by the addition of fructose and the extent of the decrease depended on the concentration of fructose. Furthermore, the output profile showed substrate-specificity of FDH. These results strongly suggest that enzymatic oxidation of the substrate and the subsequent direct electron transfer from the enzyme to the gold-gate was detected sensitively with the gold-gate chemical CCD. This finding will open a new field of bioelectronic sensors and devices.