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Needle enzyme electrodes for biological studies.

S J Churchouse, C M Battersby, W H Mullen

    Biosensors
    |January 1, 1986
    PubMed
    Summary
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    New needle enzyme electrodes accurately measure glucose and lactate in blood. These sensors utilize advanced membranes for enhanced selectivity and reduced stirring dependence, correlating well with established methods.

    Area of Science:

    • Biomedical Engineering
    • Analytical Chemistry
    • Electrochemistry

    Background:

    • Development of accurate and selective biosensors for clinical diagnostics is crucial.
    • Existing electrochemical sensors often face challenges with selectivity and interference in complex biological samples like blood.
    • Needle-type enzyme electrodes offer potential for minimally invasive in-vivo or point-of-care measurements.

    Purpose of the Study:

    • To develop and characterize novel needle enzyme electrodes for simultaneous or individual measurement of glucose and lactate.
    • To enhance the selectivity and clinical applicability of these sensors in whole blood samples.
    • To improve the performance characteristics, such as linearity and reduced stirring dependence, of needle-type electrochemical sensors.

    Main Methods:

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    • Fabrication of needle enzyme electrodes using glutaraldehyde-crosslinked oxidases immobilized on H2O2 sensors (less than 1.1 mm OD).
    • Incorporation of a polyethersulphone membrane for exclusion of electrochemical interferents from the platinum working electrode.
    • Application of outer low-permeability polyurethane membranes to extend linearity and minimize stirring effects.

    Main Results:

    • The developed glucose needle electrode demonstrated linearity across the clinical range.
    • The sensor exhibited reduced stirring dependence when utilizing the outer polyurethane membrane.
    • In unstirred whole blood, the glucose electrode showed excellent correlation (r = 0.991) with a standard spectrophotometric method.

    Conclusions:

    • Needle enzyme electrodes incorporating specific membrane strategies offer a viable approach for accurate glucose and lactate determination in blood.
    • The fabricated sensors provide enhanced selectivity and stability, suitable for clinical applications.
    • These biosensors represent a promising advancement for point-of-care testing and continuous monitoring.