Journal
POLYMERS
Volume 11, Issue 3, Pages -Publisher
MDPI
DOI: 10.3390/polym11030551
Keywords
ferrocene; biosensor; redox polymer; polyelectrolytes
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Funding
- National Nature Science Foundation of China [51473145, 51573163, 51773174]
- Zhejiang Provincial Natural Science Foundation of China [LR16E030002]
- Fundamental Research Funds for the Central Universities
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A polyelectrolyte film-coated electrode for the quantitative detection of glucose was reported. Carbon nanotubes, graphene oxide and polyelectrolyte with a ferrocenyl group were used to modify an enzyme electrode to facilitate the electron transfer between glucose oxidase and the electrode. Cyclic voltammetry and amperometric methods were adopted to investigate the effects of different polyelectrolytes and carbon nanomaterials on the electrochemical properties of enzyme electrodes. The results indicate that the ferrocenyl groups on a polyelectrolyte skeleton act as a mediator between the redox center of glucose oxidase and the electrode, which efficiently enhances the electron transfer between a glassy carbon electrode and glucose oxidase. The calibration curve of the sensor shows a linear range from 0.2 to 5 mM for glucose response. The sensor can achieve 95% of the steady-state current within 10 s. The electrodes also present high operational stability and long-term storage stability.
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