Abstract
Biodevices in which biomolecules such as enzymes and antibodies are immobilized on the surface of electrode materials are capable of converting chemical energy into electrical energy, and are expected to contribute to solving energy problems and developing medical measurements especially as biobatteries and biosensors. Device performance depends on the interface formed between the biomolecule layer and electrode material, and the interface is required to simultaneously achieve a highly efficient enzymatic reaction and electron transfer. However, when enzymes were immobilized on a material surface, the enzymes undergoes a structural change due to the interaction between the enzyme and the electrode surface, making it difficult to maximize the function of the enzyme molecule on the material surface. In this study, we postulate that the structural change of the enzyme would be reduced and the electrochemical performance improved by making the contact area between the enzyme and the electrode extremely small and adsorbing it as a point. Therefore, we aimed to develop a high-power biodevice that retains enzyme structure and activity by interposing gold nanoparticles (AuNPs) between the enzyme and the electrode. The enzymatic and electrochemical properties of pyrroloquinoline quinone-dependent glucose dehydrogenase adsorbed on AuNPs of 5–40 nm diameter were investigated. We found that the characteristics differed among the particles, and the enzyme adsorbed on 20 nm AuNPs showed the best electrochemical characteristics.
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Mori, S., Kitta, Y., Sakamoto, H. et al. Electrochemical characteristics of a gold nanoparticle-modified controlled enzyme–electrode contact junction electrode. Biotechnol Lett 43, 1037–1042 (2021). https://doi.org/10.1007/s10529-021-03092-3
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DOI: https://doi.org/10.1007/s10529-021-03092-3