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Functionalizing electrospun fibers with biologically relevant macromolecules.

Cheryl L Casper1, Nori Yamaguchi, Kristi L Kiick

  • 1Department of Materials Science and Engineering, University of Delaware, Newark, Delaware 19716, USA.

Biomacromolecules
|July 12, 2005
PubMed
Summary

Researchers developed functionalized electrospun fibers using poly(ethylene glycol)-low molecular weight heparin (PEG-LMWH) for enhanced biomaterial applications. These PEG-LMWH fibers demonstrate sustained growth factor delivery and improved binding, paving the way for advanced tissue engineering and wound healing solutions.

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Tissue Engineering

Background:

  • Functionalized polymers are crucial for biomedical applications, particularly in creating fibrous matrices mimicking the natural extracellular matrix (ECM).
  • Such materials are vital for advancements in wound healing and tissue engineering.
  • Developing methods for fabricating biologically functionalized polymers is a key research area.

Purpose of the Study:

  • To create a biologically active electrospun matrix for immobilizing and delivering growth factors long-term.
  • To fabricate poly(ethylene glycol) functionalized with low molecular weight heparin (PEG-LMWH) into fibers for drug delivery, tissue engineering, and wound repair.
  • To investigate the incorporation and retention of heparin within electrospun fibers.

Main Methods:

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  • Electrospinning was employed to create PEG-LMWH fibers using poly(ethylene oxide) (PEO) or poly(lactide-co-glycolide) (PLGA) as carrier polymers.
  • Characterization techniques included Field Emission Scanning Electron Microscopy (FESEM), Energy-Dispersive X-ray analysis (EDX), UV-vis spectroscopy, and multiphoton microscopy.
  • Toluidine blue assays were used to quantify heparin concentration, and multiphoton microscopy assessed long-term retention.

Main Results:

  • Electrospun fibers with diameters ranging from 100 to 400 nm were produced without affecting surface morphology.
  • Heparin incorporation into electrospun PEO and PLGA fibers was confirmed at concentrations of 3.5 to 85 µg/mg.
  • PEG-LMWH functionalized fibers showed sustained heparin retention for at least 14 days and improved binding of basic fibroblast growth factor.

Conclusions:

  • Electrospinning is an effective method for fabricating functionalized heparin-containing fibers for biomaterial applications.
  • PEG-LMWH functionalized electrospun matrices offer potential for controlled drug delivery and enhanced tissue regeneration.
  • These findings highlight the utility of electrospun fibers for advanced biomaterials with tailored biological activity.