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Nucleoside-Based Cross-Linkers for Hydrogels with Tunable Properties.

Rafael Itzhakov1,2, Dmitry Tworowski3, Noy Sadot2,4

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Summary

Bioderived dialdehydes from nucleosides and ribose create tunable chitosan hydrogels. These biocompatible materials show potential for 3D printing, soft lithography, and plant cell growth platforms.

Keywords:
biocompatibilitybiopolymerschitosancross-linkershydrogelsnucleosides

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Biotechnology

Background:

  • Developing novel cross-linkers for biopolymer hydrogels is crucial for advanced material applications.
  • Existing cross-linking methods may have limitations in biocompatibility or tunability.

Purpose of the Study:

  • To synthesize and characterize bioderived dialdehyde cross-linkers from nucleosides and ribose.
  • To create tunable chitosan-based hydrogels using these novel cross-linkers.
  • To investigate the properties and potential applications of the resulting hydrogels.

Main Methods:

  • Partial oxidation of nucleosides (inosine, uridine) and ribose to yield dialdehydes (IdA, UdA, RdA).
  • Hydrogel formation via cross-linking of dialdehydes with chitosan.
  • Rheological, mechanical, and liquid holding property assessments.
  • Computational modeling and molecular dynamics simulations for cross-linking mechanism analysis.
  • Application testing in plant cell culture, 3D printing, and soft lithography.

Main Results:

  • Successfully synthesized inosine dialdehyde (IdA), uridine dialdehyde (UdA), and ribose dialdehyde (RdA).
  • Chitosan hydrogels exhibited tunable properties (rheological, mechanical, liquid holding) based on cross-linker type and concentration.
  • Hydrogels demonstrated injectability, softness, and moldability.
  • Both covalent and noncovalent interactions (π-π stacking, cation-π, H-bonding) were identified as key to hydrogel formation.
  • Hydrogels supported plant cell growth, served as injectable inks for 3D printing, and were used for soft lithography.

Conclusions:

  • Bioderived dialdehydes offer a versatile platform for creating tunable chitosan hydrogels.
  • The hydrogels possess properties suitable for diverse biotechnological applications.
  • Noncovalent interactions play a significant role in the cross-linking mechanism, enhancing material properties.