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Anticoagulant Drugs: Low-Molecular-Weight Heparins01:30

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Hemostasis is a crucial process that prevents excessive blood loss from damaged blood vessels. It involves various mechanisms such as vasoconstriction, platelet adhesion and activation, and fibrin formation. The importance of each mechanism depends on the type of vessel injury. In contrast, thrombosis is the abnormal formation of a blood clot within the blood vessels, leading to potential complications if the clot obstructs blood flow. Thrombosis can be caused by increased coagulability of the...
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Novel thrombo-resistant coating based on iron-polysaccharide complex multilayers.

Meng Liu1, Xiuli Yue, Zhifei Dai

  • 1Nanomedicine and Biosensor Laboratory, Bio-X Center, and State Key Laboratory of Urban Water Resources and Environment (SKLUWRE), Harbin Institute of Technology, Harbin, China.

ACS Applied Materials & Interfaces
|April 2, 2010
PubMed
Summary
This summary is machine-generated.

Researchers developed a stable, thrombo-resistant coating using iron-polysaccharide layers. This advanced coating enhances anticoagulant properties for medical devices, improving long-term performance and biocompatibility.

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Area of Science:

  • Biomaterials Science
  • Surface Chemistry
  • Medical Device Coatings

Background:

  • Iron-polysaccharide complexes exhibit good biocompatibility.
  • Thrombo-resistant coatings are crucial for blood-contacting medical devices.
  • Layer-by-layer self-assembly is a versatile technique for fabricating functional surfaces.

Purpose of the Study:

  • To fabricate a stable thrombo-resistant coating using iron (Fe(III)) and polysaccharides (heparin and dextran sulfate).
  • To investigate the structural, hydrophilic, and stability properties of the fabricated coatings.
  • To evaluate the anticoagulant activity and biocompatibility of the coated surfaces for medical applications.

Main Methods:

  • Layer-by-layer self-assembly of Fe(III), heparin (Hep), and dextran sulfate (DS) onto various surfaces.
  • Spectrophotometric analysis (absorbance at 350 nm) to confirm multilayer formation.
  • Activated partial thromboplastin time (APTT) assays and platelet adhesion tests to assess anticoagulant properties.
  • Chromogenic assays to evaluate heparin's catalytic activity and thrombin inactivation.

Main Results:

  • A uniform multilayer coating was successfully fabricated, confirmed by linear increase in absorbance with layer number.
  • The coating incorporating dextran sulfate ((Fe3+/DS/Fe3+/Hep)5) exhibited enhanced hydrophilicity and stability compared to (Fe3+/Hep)10.
  • Both (Fe3+/Hep)10 and (Fe3+/DS/Fe3+/Hep)5 coated surfaces demonstrated significant anticoagulant activity.
  • Surface-bound heparin retained its catalytic capacity for antithrombin(III)-mediated thrombin inactivation.
  • Coatings with heparin or dextran sulfate as the outermost layer exhibited superior anticoagulant activity.

Conclusions:

  • The developed iron-polysaccharide coatings are stable and exhibit significant thrombo-resistance.
  • Incorporating dextran sulfate improves coating stability and hydrophilicity.
  • The outermost layer composition critically influences anticoagulant efficacy.
  • These advanced coatings hold promise for enhancing the performance of long-term blood-contacting medical devices.