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Physical properties of crosslinked hyaluronic acid hydrogels

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Abstract

In order to improve the mechanical properties and control the degradation rate of hyaluronic acid (HA) an investigation of the structural and mechanical properties of the hydrogels crosslinked using divinyl sulfone (DVS), glutaraldehyde (GTA) and freeze-thawing, or autocrosslinking has been carried out. The thermal and mechanical properties of the gels were characterised by differential scanning calorimetry (DSC), dynamic mechanical thermal analysis (DMTA) and compression tests. The solution degradation products of each system have been analysed using size exclusion chromatography (SEC) and the Zimm–Stockmayer theory applied. Autocrosslinked gels swell the most quickly, whereas the GTA crosslinked gels swell most slowly. The stability of the autocrosslinked gels improves with a reduction in solution pH, but is still poor. GTA and DVS crosslinked gels are robust and elastic when water swollen, with glass transition values around 20°C. SEC results show that the water soluble degradation products of the gels show a reduction in the radius of gyration at any particular molecular weight and this is interpreted as indicating increased hydrophobicity arising from chemical modification.

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  1. Department of Materials Science and Technology, University of Limerick, Limerick, Ireland

    Maurice N. Collins & Colin Birkinshaw

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  1. Maurice N. Collins
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  2. Colin Birkinshaw
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Correspondence to Maurice N. Collins.

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Collins, M.N., Birkinshaw, C. Physical properties of crosslinked hyaluronic acid hydrogels. J Mater Sci: Mater Med 19, 3335–3343 (2008). https://doi.org/10.1007/s10856-008-3476-4

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  • DOI: https://doi.org/10.1007/s10856-008-3476-4

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