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Monodispersed glucose-responsive microgels operating at physiological salinity.

Véronique Lapeyre1, Isabelle Gosse, Sylviane Chevreux

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Researchers developed glucose-responsive microgels using phenylboronic acid (PBA) derivatives. These smart polymer particles show swelling changes with glucose concentration, useful for developing novel colorimetric sensors.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Submicrometric microgels offer tunable properties for advanced applications.
  • Phenylboronic acid (PBA) derivatives are known for their ability to bind with saccharides, including glucose.

Purpose of the Study:

  • To synthesize monodispersed poly(N-isopropylacrylamide) microgels functionalized with a PBA derivative.
  • To investigate the glucose responsiveness of these modified microgels.
  • To explore their potential as building blocks for glucose sensors.

Main Methods:

  • Precipitation polymerization was employed to synthesize PBA-modified poly(N-isopropylacrylamide) microgels.
  • Particle size, composition, and swelling behavior were characterized.
  • Glucose responsiveness was evaluated at varying glucose concentrations and conditions.

Main Results:

  • Monodispersed submicrometric microgels with controlled size and composition were successfully synthesized.
  • The microgels exhibited glucose responsiveness, with swelling degree proportional to glucose concentration near the PBA derivative's pKa.
  • Glucose response was dependent on the microgel's initial state (temperature, functionalization degree).
  • PBA-rich microgels showed significant swelling in glucose at physiological electrolyte concentrations.

Conclusions:

  • Synthesized PBA-modified microgels are effectively glucose-responsive.
  • The observed glucose-induced swelling behavior is tunable by particle composition and preparation conditions.
  • These microgels show promise as components for developing light-diffracting colloidal crystal-based colorimetric glucose sensors.