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An Initial Evaluation of Gellan Gum as a Material for Tissue Engineering Applications
1 Biomaterials Unit, School of Dentistry, University of Birmingham St
Chad's Queensway, Birmingham, B4 6NN, UK, Medicines Research Unit, School of
Life and Health Sciences Aston University, Aston Triangle, Birmingham B4 7ET, UK
* To whom correspondence should be addressed.
Alpha-modified minimum essential medium (alphaMEM) has been found to cross-link a 1% gellan gum solution, resulting in the formation of a self-supporting hydrogel in 1:1 and 5:1 ratios of polysaccharide: alphaMEM. Rheological data from temperature sweeps confirm that in addition to orders of magnitude differences in G' between 1% gellan and 1% gellan with alphaMEM, there is also a 20°C increase in the temperature at which the onset of gelation takes place when alphaMEM is present. Frequency sweeps confirm the formation of a true gel; mechanical spectra for mixtures of gellan and alphaMEM clearly demonstrate G' to be independent of frequency. It is possible to immobilize cells within a three-dimensional (3D) gellan matrix that remain viable for up to 21 days in culture by adding a suspension of rat bone marrow cells (rBMC) in alphaMEM to 1% gellan solution. This extremely simple approach to cell immobilization within 3D constructs, made possible by the fact that gellan solutions cross-link in the presence of millimolar concentrations of cations, poses a very low risk to a cell population immobilized within a gellan matrix and thus indicates the potential of gellan for use as a tissue engineering scaffold. Key Words: gellan, hydrogel, bone, cell viability, three-dimensional
First published on May 10, 2007, doi:10.1177/0885328207076522 |
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