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Robust Single-Molecule Enzyme Nanocapsules for Biosensing with Significantly Improved Biosensor Stability.

Dhanjai1, Xianbo Lu1, Lingxia Wu1

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Highly stable single-molecule enzyme nanocapsules (SMENs) were developed to overcome the poor stability of traditional enzyme biosensors. These nanocapsules offer enhanced thermal and operational stability for improved diagnostic applications.

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Area of Science:

  • Biotechnology
  • Nanotechnology
  • Biosensor Technology

Background:

  • Enzyme-based biosensors are crucial for diagnostics but suffer from poor stability (thermal, operational, solvent).
  • This instability limits their practical application in point-of-care settings and other demanding environments.

Purpose of the Study:

  • To develop highly stable single-molecule enzyme nanocapsules (SMENs) as a superior alternative to native enzymes in biosensors.
  • To enhance the thermal stability, organic solvent tolerance, and long-term operational stability of enzyme biosensors.

Main Methods:

  • Synthesized single-molecule enzyme nanocapsules (SMENs) of glucose oxidase (GOx) using an in situ polymerization strategy.
  • Characterized the nanocapsules using particle-size distribution, TEM, and UV-vis spectroscopy.
  • Implemented the nGOx SMENs in nano(bio)sensors for diagnostic applications.

Main Results:

  • The polymer shell effectively stabilized the GOx enzyme core while allowing substrate transport.
  • nGOx SMENs demonstrated significantly improved thermal stability (up to 65 °C) and organic solvent tolerance.
  • The nano(bio)sensor using nGOx SMENs retained ~56% activity after 4h at 65 °C, compared to native GOx losing activity.

Conclusions:

  • Developed a new class of biocatalytic nanocapsules (SMENs) with enhanced enzyme stability and activity.
  • SMENs offer a robust solution to improve biosensor performance in variable environments.
  • This technology has potential for point-of-care diagnostics, biomedical detection, wearable devices, and biofuel cells.