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The glucose enzyme electrode: is simple peroxide detection at a needle sensor acceptable?
P Vadgama1, W Mullen, S Churchouse
1University of Newcastle, England.
Hormone and Metabolic Research. Supplement Series
|January 1, 1988
Summary
New needle-type sensors improve glucose measurement by minimizing dependence on stirring and oxygen levels. Enhanced membranes extend the linear range and allow for selective blood glucose analysis, focusing future work on biocompatibility.
Area of Science:
- Biomedical Engineering
- Analytical Chemistry
- Biosensors
Background:
- Needle-type devices using platinum (Pt) anodes for hydrogen peroxide (H2O2) detection are used for glucose measurement.
- Initial designs showed limitations including high dependence on stirring, background oxygen (pO2) levels, and a restricted glucose assay range.
Purpose of the Study:
- To enhance the performance of needle-type glucose sensors.
- To extend the linear range and reduce environmental dependencies for more reliable glucose monitoring.
Main Methods:
- Fabrication of Pt anode needle-type sensors.
- Coating devices with glucose oxidase.
- Utilizing wet dip-coating of microporous polyurethane or preformed porous membranes.
- Incorporating polyethersulfone membranes for blood analysis.
Main Results:
- Extended linear glucose assay range up to 70 mM.
- Achieved minimal pO2 dependence and insensitivity to stirring.
- Demonstrated high selectivity in blood glucose measurement (y = 0.954x + 0.202, r = 0.991).
Conclusions:
- Simple peroxide detection via needle sensors is viable for glucose monitoring.
- Membrane modifications significantly improve sensor performance and reliability.
- Future research should prioritize enhancing the biocompatibility of these improved sensors.