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Microelectrodes modified with electropolymerized plumbagin (PLG) were used for the generation of superoxide radical (O2.−) and hydrogen peroxide (H2O2) during oxygen reduction reaction (ORR) in an aqueous medium, specifically in serum‐free cell culture media. This is enabled by the specific design of a polymer film on the microelectrode. The generation and diffusion of O2.− during electrocatalytic...
Scanning electrochemical microscopy (SECM) was applied to study quinoprotein-based biosensor or biochip. A typical quinoprotein, pyrroloquinoline quinone (PQQ)-dependent glucose dehydrogenase (GDH), was taken as example. Feedback mode and generation collection (GC) mode in SECM have been explored in imaging the catalytic activity of GDH on microscopic magnetic bead domains. Biotinylated GDH was immobilized...
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