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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Polymer Chemistry

Background:

  • Cellulose nanocrystals (CNCs) are natural, stiff nanomaterials with potential for biomedical applications.
  • Heparin is a widely used anticoagulant, but its solution-based form can have long-term side effects.
  • Developing biocompatible materials that inhibit blood clotting is crucial for various medical applications.

Purpose of the Study:

  • To develop a biocompatible material using modified cellulose nanocrystals (CNCs) that inhibits blood clotting.
  • To investigate the effect of surface functionalization of CNCs on their anticoagulant properties.
  • To create a material with favorable mechanical properties and reduced clotting potential.

Main Methods:

  • Surface chemistry modification of CNCs through TEMPO oxidation and sulfonation.
  • Characterization of functionalized CNCs with varying carboxylate (COO-) and sulfate (SO3-) group densities.
  • Evaluation of CNCs' biocompatibility and anticoagulant activity using platelet adherence and blood assays.

Main Results:

  • Surface functionalization of CNCs significantly reduced blood coagulation.
  • TEMPO-oxidized CNCs (500 mmol COO-/kg) and sulfonated CNCs (330 mmol SO3-/kg) demonstrated reduced clotting compared to plain CNCs (70 mmol SO3-/kg).
  • Modified CNCs exhibited favorable mechanical properties alongside reduced clotting.

Conclusions:

  • Surface functionalization of cellulose nanocrystals provides a viable strategy for creating heparin-mimicking, blood-compatible materials.
  • Modified CNCs offer a promising foundation for developing novel anticoagulants with reduced side effects.
  • This approach allows for the creation of materials with tailored mechanical and biological properties for biomedical use.