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Biochemical surface modifications to titanium implants using the tresyl chlorideactivated method.

Tohru Hayakawa1

  • 1Department of Dental Engineering, Tsurumi University School of Dental Medicine.

Dental Materials Journal
|December 4, 2015
PubMed
Summary

A simple tresyl chloride (2,2,2-trifluoroethanesulfonyl chloride) method effectively immobilizes biological molecules onto titanium. This enhances cell attachment and bone formation, showing promise for biomedical applications.

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Area of Science:

  • Biomaterials Science
  • Surface Chemistry
  • Tissue Engineering

Background:

  • Titanium is widely used in biomedical implants due to its biocompatibility.
  • Immobilizing biological molecules onto titanium surfaces can improve implant integration and function.
  • Existing methods for biomolecule immobilization can be complex or inefficient.

Purpose of the Study:

  • To develop and evaluate a simple, solvent-free method for immobilizing biological molecules onto titanium surfaces using tresyl chloride activation.
  • To investigate the mechanism of biomolecule immobilization and its impact on cell behavior and bone formation.
  • To explore the potential of this method for enhancing the performance of titanium-based implants.

Main Methods:

  • Direct application of tresyl chloride (2,2,2-trifluoroethanesulfonyl chloride) to titanium disks without solvents.
  • Immersion of tresylated titanium in protein or peptide solutions for immobilization.
  • Frontier molecular orbital calculations to understand reactivity.
  • Quartz-crystal microbalance-dissipation measurements to analyze interactions.
  • In vitro cell attachment assays.
  • In vivo studies of bone formation in rat femur defects.

Main Results:

  • The tresyl chloride-activated method provides an easy and efficient way to immobilize proteins and peptides onto titanium.
  • Computational analysis indicated improved reactivity between tresylated surfaces and protein amine groups.
  • Ionic interactions were identified as crucial for fibronectin immobilization.
  • Immobilization of fibronectin or collagen enhanced initial cell attachment.
  • Fibronectin and its peptides promoted bone formation-related gene expression.
  • Cytokine immobilization on titanium improved bone formation in vivo.

Conclusions:

  • The tresyl chloride-activated method is a versatile and effective technique for immobilizing diverse biological molecules onto titanium.
  • This approach significantly enhances cellular responses and promotes bone regeneration, offering a valuable tool for developing advanced orthopedic and dental implants.
  • The method's simplicity and efficiency make it suitable for various biomedical applications requiring functionalized titanium surfaces.