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Heparinized Polyurethane Surface Via a One-Step Photografting Method.

Zhangshuan Liu1,2, Liming Fang3,4, Guillaume Delaittre5,6

  • 1National Engineering Research Center for Tissue Restoration and Reconstruction, Guangzhou 510006, China. X_recon@163.com.

Molecules (Basel, Switzerland)
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Summary

A new photografting method improves heparin grafting onto polyurethane surfaces. Lowering anchoring points enhances heparin

Keywords:
bioactivitycatheterheparinizationphotograftingpolyurethane

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Area of Science:

  • Biomaterials Science
  • Surface Chemistry
  • Polymer Science

Background:

  • Traditional heparin grafting methods onto polyurethane (PU) suffer from low efficiency.
  • Coupling chemistry methods present limitations for effective surface modification.

Purpose of the Study:

  • To develop a rapid, one-step photografting technique for immobilizing heparin derivatives onto PU surfaces.
  • To investigate the impact of varying anchor point densities on heparinized PU properties.

Main Methods:

  • Synthesis of three heparin derivatives with different aryl azide group percentages.
  • Immobilization of heparin derivatives onto PU surfaces via photografting.
  • Characterization of surface properties, including charge, antithrombin III binding, and blood coagulation times.

Main Results:

  • Heparinized PU with the lowest anchor point density exhibited the highest negative surface charge and antithrombin III binding.
  • Reduced anchor point density significantly inhibited platelet adhesion and prolonged various blood coagulation times.
  • Immobilized heparin bioactivity increased from 22.9% to 36.9% with decreased anchor density.

Conclusions:

  • The one-step photografting method offers an efficient alternative for heparin immobilization.
  • Lowering anchor point density enhances heparin's anticoagulant properties and bioactivity through increased molecular mobility and surface charge.
  • This approach holds promise for developing improved blood-contacting medical devices.