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Hydrogel Microvalves as Control Elements for Parallelized Enzymatic Cascade Reactions in Microfluidics.

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  • 1Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, 01069 Dresden, Germany.

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Summary

This study integrates thermoresponsive poly(N-isopropylacrylamide) (PNiPAAm) microvalves into microfluidic devices to control parallel enzyme-catalyzed cascade reactions. These microvalves enable precise fluid pathway control for multistep biocatalysis and screening.

Keywords:
enzymehydrogelmicrofluidicsparallelizationpoly(N-isopropylacrylamide) (PNiPAAm)polydimethylsiloxane (PDMS)-on-glassthermoresponsivevalves

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Area of Science:

  • Biocatalysis
  • Microfluidics
  • Polymer Science

Background:

  • Compartmentalized microfluidic devices with immobilized catalysts are crucial for managing incompatible reactions and high-throughput screening.
  • Stimuli-responsive hydrogel microvalves offer potential for flow control in microfluidics, but their application in multistep reactions remained unexplored.

Purpose of the Study:

  • To demonstrate the integration of thermoresponsive poly(N-isopropylacrylamide) (PNiPAAm) microvalves into microfluidic devices for controlling parallel enzyme-catalyzed cascade reactions.
  • To establish a method for precise fluid pathway control in microfluidic systems for multistep biocatalysis.

Main Methods:

  • Thermoresponsive PNiPAAm microvalves (500 and 600 µm diameter) were integrated into PDMS-on-glass microfluidic devices.
  • Biocatalysts glucose oxidase (GOx), horseradish peroxidase (HRP), and myoglobin (Myo) were immobilized in hydrogel dot arrays (350 µm diameter).
  • Microvalve switching (4-6 s) controlled substrate solution pathways for sequential enzyme cascade reactions, quantified by UV-Vis spectroscopy.

Main Results:

  • The PNiPAAm microvalves successfully controlled fluid pathways for parallelized enzyme cascade reactions (GOx-HRP and GOx-Myo).
  • Microvalve functionality was demonstrated over four hourly switching cycles, with path-dependent substrate conversion visualized.
  • The system allowed for continuous quantification of enzyme cascade reactions.

Conclusions:

  • The integration of PNiPAAm microvalves provides effective control over multistep enzyme cascade reactions in microfluidic devices.
  • This approach enables precise management of fluid pathways, facilitating parallelized biocatalysis and high-throughput screening.
  • The developed system represents a significant advancement in microfluidic control for complex biochemical processes.