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Related Experiment Video

Updated: Mar 25, 2026

Attaching Biological Probes to Silica Optical Biosensors Using Silane Coupling Agents
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Rational surface silane modification for immobilizing glucose oxidase.

Feibao Tian1, Yi Guo1, Feifei Lin1

  • 1State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, PR China.

International Journal of Biological Macromolecules
|February 28, 2016
PubMed
Summary
This summary is machine-generated.

Surface modification of glucose oxidase (GOx) with (3-aminopropyl) trimethoxysilane) (APTES) enhances enzyme activity and stability. Low APTES content is key for optimal performance in extreme conditions, improving biosensor applications.

Keywords:
Glucose oxidaseImmobilizationSilane surface modificationSilica nanoparticles

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Area of Science:

  • Biochemistry
  • Materials Science
  • Enzyme Engineering

Background:

  • Glucose oxidase (GOx) is crucial for biosensors and biocatalysis.
  • Surface modification is explored to enhance enzyme properties.
  • Understanding silane binding efficiency is key for optimizing GOx immobilization.

Purpose of the Study:

  • To quantitatively analyze the binding efficiency of (3-aminopropyl) trimethoxysilane (APTES) on glucose oxidase (GOx).
  • To investigate the impact of APTES grafting on GOx activity, structure, and stability.
  • To determine optimal surface modification strategies for improved immobilized GOx performance.

Main Methods:

  • Quantitative analysis of APTES binding to GOx.
  • Measurement of relative enzyme activity and tertiary structure.
  • Assessment of immobilized GOx stability under extreme pH and temperature.

Main Results:

  • APTES content did not significantly affect GOx relative activity or tertiary structure.
  • Immobilization increased GOx activity and loading compared to the native enzyme.
  • Low APTES content yielded superior stability at extreme pH (e.g., pH 2.0) and high temperatures, with over 600% activity increase.

Conclusions:

  • Rational surface modification with APTES can enhance GOx activity, stability, and loading.
  • Optimizing silane content is critical for achieving high performance in immobilized GOx systems.
  • This approach benefits the development of advanced biosensors and biocatalytic systems.