Abstract
Tetramethylferrocene-modified linear(polyethylenimine) (FcMe4-C3-LPEI) was cross-linked with ethylene glycol diglycidyl ether (EGDGE) in the presence of glucose oxidase (GOx) to form enzymatic glucose bioanodes capable of generating 1.034±0.039mA/cm2 with 3mm glassy carbon electrodes and 15.1±0.8 mA/cm2 with 0.5×0.5cm carbon felt electrodes at 25°C. FcMe4-C3-LPEI/GOx films were characterized by varying the amount of EGDGE, pH, and electrode material. The electrochemical potential was shown to vary with the amount of EGDGE used to cross-link the film, from 0.068±0.016V to 0.122±0.003V vs SCE using 4 mol% to 32 mol% EGDGE respectively. A similar trend occurred upon varying pH from 0.073±0.004V vs SCE at pH 4.0 to 0.118±0.003 at pH 8.0. The optimized materials described herein have direct practical use as enzymatic bioanodes and as glucose biosensors.
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