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Second generation biosensors.

F W Scheller1, F Schubert, B Neumann

  • 1Academy of Sciences, Central Institute of Molecular Biology, Berlin-Buch, FRG.

Biosensors & Bioelectronics
|January 1, 1991
PubMed
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This study presents advanced glucose sensors using enzyme-membrane electrodes. Innovations include improved analytical quality, interference suppression, and reagentless measurement for enhanced glucose determination.

Area of Science:

  • Biomedical Engineering
  • Electrochemistry
  • Biosensors

Background:

  • Enzyme-membrane electrodes with glucose oxidase are standard for diluted sample analysis.
  • Fast-responding glucose sensors utilize porous enzyme layers on thin metal electrodes.
  • Second-generation sensors co-immobilize auxiliary enzymes/co-reactants to enhance analytical quality.

Purpose of the Study:

  • To develop highly sensitive and reliable glucose sensors.
  • To improve analytical quality and simplify sensor performance.
  • To enable reagentless glucose measurement and suppress interferences.

Main Methods:

  • Fabrication of fast-responding glucose sensors using porous enzyme layers on thin metal electrodes.
  • Co-immobilization of glucose oxidase/peroxidase complex to suppress oxidizable interferences.

Related Experiment Videos

  • Utilizing a glucose oxidase/peroxidase layer-covered fluoride FET for potentiometric determination.
  • Incorporating NAD bound to PEG in glucose dehydrogenase layer for reagentless sensing.
  • Main Results:

    • Achieved extremely fast response times in glucose sensors.
    • Suppressed oxidizable interferences using a glucose oxidase/peroxidase complex at low potentials.
    • Demonstrated insensitivity to pH and buffer capacity fluctuations with fluoride FET sensors.
    • Increased sensitivity by several orders of magnitude through enzymatic analyte recycling/intermediate accumulation.

    Conclusions:

    • Developed advanced enzyme-membrane electrodes for superior glucose sensing.
    • Innovations enable enhanced analytical quality, interference reduction, and reagentless operation.
    • These glucose sensors offer significant improvements for laboratory analysis and diagnostics.