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Multivalency Enables Dynamic Supramolecular Host-Guest Hydrogel Formation.

Huey Wen Ooi1, Jordy M M Kocken1, Francis L C Morgan1

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Multivalent host-guest interactions in dynamic biomaterials significantly enhance binding affinity and enable robust hydrogel formation. This supramolecular design is crucial for advanced drug delivery platforms.

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Area of Science:

  • Biomaterials Science
  • Supramolecular Chemistry
  • Polymer Chemistry

Background:

  • Dynamic biomaterials mimic the extracellular matrix (ECM) for tissue engineering and drug delivery.
  • Host-guest chemistry, particularly using cyclodextrin (CD) and adamantane, is a key supramolecular interaction.
  • Previous studies focused on singular or non-discrete multivalent interactions, leaving synergistic effects underexplored.

Purpose of the Study:

  • To investigate the impact of multivalent adamantane (guest) cross-linkers on supramolecular network formation with alginate-CD (Alg-CD).
  • To quantify the binding constants of multivalent host-guest interactions.
  • To explore the potential of these dynamic hydrogels for biomedical applications.

Main Methods:

  • Synthesis of multivalent adamantane cross-linkers with varying valencies and spacer groups.
  • NMR titrations to determine binding constants between Alg-CD and adamantane cross-linkers.
  • Hydrogel formation studies and preliminary cytocompatibility assays.

Main Results:

  • Binding constants increased with multivalent constructs, demonstrating a synergistic effect.
  • Higher valency cross-linkers, particularly an 8-arm adamantane guest, facilitated robust hydrogel formation.
  • Inclusion of a phenyl spacer enhanced binding affinity and gelation properties.

Conclusions:

  • Multivalent host-guest interactions are critical for designing robust, dynamic supramolecular hydrogels.
  • The developed hydrogels exhibit tunable network properties and cytocompatibility.
  • These materials show significant promise for cell- and small molecule-delivery systems.