Document Detail

Coaxial electrospinning of (fluorescein isothiocyanate-conjugated bovine serum albumin)-encapsulated poly(epsilon-caprolactone) nanofibers for sustained release.
MedLine Citation:
PMID:  16602720     Owner:  NLM     Status:  MEDLINE    
As an aim toward developing biologically mimetic and functional nanofiber-based tissue engineering scaffolds, we demonstrated the encapsulation of a model protein, fluorescein isothiocyanate-conjugated bovine serum albumin (fitcBSA), along with a water-soluble polymer, poly(ethylene glycol) (PEG), within the biodegradable poly(epsilon-caprolactone) (PCL) nanofibers using a coaxial electrospinning technique. By variation of the inner flow rates from 0.2 to 0.6 mL/h with a constant outer flow rate of 1.8 mL/h, fitcBSA loadings of 0.85-2.17 mg/g of nanofibrous membranes were prepared. Variation of flow rates also resulted in increases of fiber sizes from ca. 270 nm to 380 nm. The encapsulation of fitcBSA/PEG within PCL was subsequently characterized by laser confocal scanning microscopy, transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) analysis. In vitro release studies were conducted to evaluate sustained release potential of the core-sheath-structured composite nanofiber PCL-r-fitcBSA/PEG. As a negative control, composite nanofiber PCL/fitcBSA/PEG blend was prepared from a normal electrospinning method. It was found that core-sheath nanofibers PCL-r-fitcBSA/PEG pronouncedly alleviated the initial burst release for higher protein loading and gave better sustainability compared to that of PCL/fitcBSA/PEG nanofibers. The present study would provide a basis for further design and optimization of processing conditions to control the nanostructure of core-sheath composite nanofibers and ultimately achieve desired release kinetics of bioactive proteins (e.g., growth factors) for practical tissue engineering applications.
Y Z Zhang; X Wang; Y Feng; J Li; C T Lim; S Ramakrishna
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Biomacromolecules     Volume:  7     ISSN:  1525-7797     ISO Abbreviation:  Biomacromolecules     Publication Date:  2006 Apr 
Date Detail:
Created Date:  2006-04-10     Completed Date:  2006-07-03     Revised Date:  2008-08-14    
Medline Journal Info:
Nlm Unique ID:  100892849     Medline TA:  Biomacromolecules     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1049-57     Citation Subset:  IM    
Division of Bioengineering, Department of Mechanical Engineering, and Nanoscience and Nanotechnology Initiative, National University of Singapore, 9 Engineering Drive 1, Singapore 117576.
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MeSH Terms
Fluorescein-5-isothiocyanate / chemistry*
Nanostructures / chemistry*,  ultrastructure
Nanotechnology / instrumentation,  methods*
Particle Size
Polyesters / chemistry*
Serum Albumin, Bovine / chemistry*
Surface Properties
Time Factors
Reg. No./Substance:
0/Polyesters; 0/Serum Albumin, Bovine; 24980-41-4/polycaprolactone; 3326-32-7/Fluorescein-5-isothiocyanate

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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