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Enzyme electrode for determining glucose in whole blood
1Miles Inc., Diagnostic Division, Elkhart, IN 46515.
Clinical Chemistry
|September 1, 1988
Summary
This study presents a novel glucose sensor for whole blood, utilizing glucose oxidase immobilized on a platinum electrode. The sensor demonstrates a linear response to glucose, fast detection times, and stability for several days, offering a reliable diagnostic tool.
Area of Science:
- Biomedical Engineering
- Electrochemistry
- Biosensors
Background:
- Accurate glucose monitoring is crucial for diabetes management.
- Existing glucose sensors face challenges with stability, response time, and interference.
Purpose of the Study:
- To develop and characterize a novel electrochemical sensor for glucose in whole blood.
- To improve sensor performance through direct enzyme immobilization and optimized membrane design.
Main Methods:
- Direct coupling of glucose oxidase (EC 1.1.3.4) to a platinum electrode using silane coupling agent and glutaraldehyde.
- Coating the catalytic layer with a thin, oxygen-permeable rubber membrane.
- Testing sensor response and stability in whole blood samples.
Main Results:
- Linear response to glucose in whole blood up to 6000 mg/L with a small positive intercept.
- Rapid response time within a few minutes.
- Low coefficient of variation (approx. 3%) and insensitivity to hematocrit.
- Sensor lifetime of several days after initial use.
Conclusions:
- The unitized construction with chemibonded enzyme and membrane is key to sensor performance.
- High oxygen permeability and whole blood compatibility of the membrane enhance accuracy.
- This sensor offers a promising solution for reliable and stable glucose monitoring in whole blood.