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International Journal of Polymer Science
Volume 2011 (2011), Article ID 473045, 9 pages
http://dx.doi.org/10.1155/2011/473045
Research Article

Application of Polyethylene Glycol to Promote Cellular Biocompatibility of Polyhydroxybutyrate Films

1Bio/Polymer Research Group, Centre for Advanced Macromolecular Design, School of Biotechnology and Biomolecular Science, University of New South Wales, Sydney, NSW 2052, Australia
2Australian Nuclear Science & Technology Organisation, Lucas Heights, Sydney, NSW 2234, Australia

Received 1 July 2011; Accepted 22 August 2011

Academic Editor: Shanfeng Wang

Copyright © 2011 Rodman T. H. Chan et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Polyhydroxybutyrate (PHB) is a biomaterial with potential for applications in biomedical and tissue engineering; however, its brittle nature and high crystallinity limit its potential. Blending PHB with a variety of PEGs produced natural-synthetic composite films composed of FDA-approved polymers with significant reductions in crystallinity, from 70.1% for PHB films to 41.5% for its composite with a 30% (w/w) loading of PEG2000. Blending also enabled manipulation of the material properties, increasing film flexibility with an extension to break of 2 . 4 9 ± 1 . 0 1 % for PHB films and 8 . 3 2 ± 1 . 0 6 % for films containing 30% (w/w) PEG106. Significant changes in the film surface properties, as measured by porosity, contact angles, and water uptake, were also determined as a consequence of the blending process, and these supported greater adhesion and proliferation of neural-associated olfactory ensheathing cells (OECs). A growth rate of 7 . 2 × 1 0 5 cells per day for PHB films with 30% (w/w) PEG2000 loading compared to 2 . 5 × 1 0 5 for PHB films was observed. Furthermore, while cytotoxicity of the films as measured by lactate dehydrogenase release was unaffected, biocompatibility, as measured by mitochondrial activity, was found to increase. It is anticipated that fine control of PEG composition in PHB-based composite biomaterials can be utilised to support their applications in medicinal and tissue engineering applications.