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Programming Gels Over a Wide pH Range Using Multicomponent Systems.

Santanu Panja1, Bart Dietrich1, Olga Shebanova2

  • 1School of Chemistry, University of Glasgow, Glasgow, G12 8QQ, UK.

Angewandte Chemie (International Ed. in English)
|February 19, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces a novel multicomponent hydrogel system that maintains its gel state across a wide pH range. Enzymatic reactions enable autonomous switching between gel states, enhancing mechanical properties.

Keywords:
ambidextrous phase behaviorautonomous programmingcooperative hydrogen bondingmulticomponent hydrogelspH responsiveness

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Biomaterials

Background:

  • Multicomponent hydrogels offer unique material properties unattainable with single-component systems.
  • pH-responsive hydrogels are crucial for various applications but often have limited pH operating ranges.
  • Traditional acid-triggered gels may not maintain structural integrity across broad pH variations.

Purpose of the Study:

  • To develop an unusual multicomponent low-molecular weight gelling system with broad pH-responsive behavior.
  • To investigate the molecular packing and structural stability (β-sheet) at different pH levels.
  • To explore the potential of enzymatic reactions for autonomous state switching and property enhancement.

Main Methods:

  • Design and synthesis of a multicomponent low-molecular weight gelling system.
  • Characterization of pH-responsive behavior through rheological measurements.
  • Analysis of molecular packing and β-sheet structure using spectroscopic techniques.
  • Enzymatic treatment to induce autonomous transitions between gel states.

Main Results:

  • The developed hydrogel system maintains a gel phase across a wide pH range due to cooperative hydrogen bonding.
  • Unlike conventional gels, this system preserves the β-sheet structure at both acidic and basic pH.
  • Autonomous switching between two distinct gel states was achieved via an enzymatic reaction.
  • The enzymatically triggered gel states exhibited improved mechanical properties.

Conclusions:

  • A novel pH-responsive multicomponent hydrogel system with broad applicability has been developed.
  • The system demonstrates unique pH stability and structural integrity through cooperative hydrogen bonding.
  • Enzymatic control offers a pathway for creating advanced hydrogels with tunable and enhanced mechanical performance.