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Light-activated spatiotemporal control over nanoreactor permeability.

Wouter P van den Akker1,2, Levena Gascoigne2, Alexander B Cook1

  • 1Department of Chemistry & Chemical Engineering, Institute for Complex Molecular Systems, Bio-Organic Chemistry, Eindhoven University of Technology, Helix, P.O. Box 513, 5600MB Eindhoven, The Netherlands. j.c.m.v.hest@tue.nl.

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Summary
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Light-responsive nanoreactors offer precise control over chemical reactions. Using a spiropyran photoacid, researchers demonstrated light-induced permeability for controlled enzyme activity and localized product synthesis.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Biotechnology

Background:

  • Light-responsive materials offer precise spatiotemporal control over chemical processes.
  • Photoacids can alter local pH environments upon light irradiation, triggering material responses.
  • Nanoreactors provide a confined environment for chemical reactions, enhancing efficiency and control.

Purpose of the Study:

  • To develop a light-activatable pH-responsive nanoreactor system.
  • To demonstrate light-induced enzymatic conversion within nanoreactors.
  • To achieve spatial control over nanoreactor permeability and localized synthesis.

Main Methods:

  • Utilized spiropyran photoacid to decrease local pH upon light illumination.
  • Encapsulated enzymes within pH-responsive nanoreactors.
  • Immobilized nanoreactors in a hydrogel matrix for spatial control.
  • Employed photomask and confocal microscopy for high-resolution spatial activation.

Main Results:

  • Light illumination triggered spiropyran photoisomerization, reducing pH and increasing nanoreactor permeability.
  • Enzymatic conversion of substrate was achieved with light, with product yield correlating to irradiation time.
  • Spatial control was demonstrated, with conversion occurring only in illuminated regions of the hydrogel.
  • High-resolution spatial control was achieved using confocal microscopy and targeted laser irradiation.

Conclusions:

  • Developed a novel light-controlled nanoreactor system for tunable permeability.
  • Demonstrated the potential for localized synthesis and controlled release applications.
  • Highlighted the advantages of light actuation, including spatiotemporal precision and waste-free operation.