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Nanocomposites based on two conducting polymers, polyaniline (PANI) and polypyrrole (Ppy), with embedded glucose oxidase (GOx) and 6 nm size gold nanoparticles (AuNPs (6nm) ) or gold-nanoclusters formed from chloroaurate ions (AuCl 4  - ), were synthesized by enzyme-assisted polymerization. Charge (electron) transfer in systems based on PANI/AuNPs (6nm) -GOx, PANI/AuNPs (AuCl4  -  ) -GOx, Ppy/AuNPs (6nm) -GOx and Ppy/AuNPs (AuCl4  -  ) -GOx nanocomposites was investigated. Cyclic voltammetry (CV)-based investigations showed that the reported polymer nanocomposites are able to facilitate electron transfer from enzyme to the graphite rod (GR) electrode. Significantly higher anodic current and well-defined red-ox peaks were observed at a scan rate of 0.10 V s -1 . Logarithmic function of anodic current (log I  pa ), which was determined by CV-based experiments performed with glucose, was proportional to the logarithmic function of a scan rate (log v ) in the range of 0.699-2.48 mV s -1 , and it indicates that diffusion-controlled electrochemical processes were limiting the kinetics of the analytical signal. The most efficient nanocomposite structure for the design of the reported glucose biosensor was based on two-day formed Ppy/AuNPs (AuCl4  -  ) -GOx nanocomposites. GR/Ppy/AuNPs (AuCl4  -  ) -GOx was characterized by the linear dependence of the analytical signal on glucose concentration in the range from 0.1 to 0.70 mmol L -1 , the sensitivity of 4.31 mA mM cm -2 , the limit of detection of 0.10 mmol L -1 and the half-life period of 19 days.

Formation and Electrochemical Evaluation of Polyaniline and Polypyrrole Nanocomposites Based on Glucose Oxidase and Gold Nanostructures