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Glucose-sensitive enzyme field effect transistor using potassium ferricyanide as an oxidizing substrate
A A Shul'ga1, M Koudelka-Hep, N F de Rooij
1Institut de Microtechnique, Université de Neuchàtel, Switzerland.
Analytical Chemistry
|January 15, 1994
Summary
This study developed a novel glucose biosensor using enzyme field-effect transistors. Enhanced ferricyanide use significantly boosted sensor response and dynamic range for accurate glucose detection.
Area of Science:
- Biomedical Engineering
- Biosensor Technology
- Enzyme-based Sensors
Background:
- Field-effect transistors (FETs) are sensitive to surface potential changes.
- Glucose oxidase (GOx) catalyzes glucose oxidation, producing protons.
- Existing biosensors face limitations in sensitivity and dynamic range.
Purpose of the Study:
- To develop a highly sensitive and stable glucose biosensor.
- To enhance the performance of enzyme field-effect transistors (EnFETs).
- To explore the use of alternative oxidizing substrates for improved biosensing.
Main Methods:
- Fabrication of a glucose-sensitive FET by immobilizing glucose oxidase on a pH-sensitive FET gate.
- Utilizing potassium ferricyanide as an oxidizing substrate instead of oxygen.
- Measuring calibration curves in phosphate and TRIS buffers at varying ferricyanide concentrations.
Main Results:
- A 10-100 fold increase in biosensor response was observed with ferricyanide.
- The dynamic range of the biosensor was substantially extended.
- Sigmoidal calibration curves were achieved, with pH changes up to two units.
- Ferricyanide increased proton generation per glucose molecule from one to three.
Conclusions:
- Potassium ferricyanide significantly enhances glucose biosensor performance.
- The developed EnFET approach offers a promising platform for sensitive analyte detection.
- This method can be adapted for detecting various analytes using different enzymes.