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Redox-Responsive Hydrogels with Decoupled Initial Stiffness and Degradation.

Charng-Yu Lin1, Carly M Battistoni1, Julie C Liu1,2

  • 1Davidson School of Chemical Engineering, Purdue University, West Lafayette, Indiana 47907, United States.

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Researchers developed novel redox-responsive hydrogels using a one-pot method. This approach decouples mechanical properties from degradation rates, offering tunable drug delivery and tissue engineering solutions.

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Biomedical Engineering

Background:

  • Disulfide-cross-linked hydrogels are valuable for biological applications due to their redox-stimuli-responsive degradation.
  • Hydrogel degradability and mechanical properties (e.g., stiffness) are often interdependent and influenced by polymer concentration.

Purpose of the Study:

  • To develop a novel one-pot cross-linking method for creating thiol-cross-linked hydrogels with decoupled mechanical properties and degradation rates.
  • To investigate the potential of these hydrogels for controlled drug delivery and tissue engineering applications.

Main Methods:

  • A one-pot cross-linking strategy was employed using divinyl sulfone (DVS) for non-reducible thioether bonds and ferric ethylenediaminetetraacetic acid (Fe-EDTA) for reducible disulfide bonds.
  • The ratio of thioether to disulfide bonds was controlled by varying DVS concentration, allowing modulation of hydrogel properties.
  • Encapsulation and release of dextran were studied, along with fibroblast cytocompatibility.

Main Results:

  • The developed method successfully decoupled initial hydrogel stiffness (shear/elastic modulus) from its degradation rate.
  • Tunable release rates of encapsulated dextran were achieved upon exposure to glutathione (10 μM).
  • The cross-linking reactions demonstrated good cytocompatibility with encapsulated fibroblasts.

Conclusions:

  • Combining DVS and Fe-EDTA offers a versatile approach to engineer thiol-cross-linked hydrogels with independent control over mechanical properties and degradation.
  • These redox-responsive hydrogels show significant potential as advanced drug delivery vehicles and scaffolds for tissue engineering with tailored degradation profiles.