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Enhanced corrosion resistance and cytocompatibility of biomimetic hyaluronic acid functionalised silane coating on AZ31 Mg alloy for orthopaedic applications

  • Biomaterials Synthesis and Characterization
  • Original Research
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Abstract

This paper reports the corrosion resistant and cytocompatible properties of the hyaluronic acid-silane coating on AZ31 Mg alloy. In this study, the osteoinductive properties of high molecular weight hyaluronic acid (HA, 1–4 MDa) and the corrosion protection of silane coatings were incorporated as a composite coating on biodegradable AZ31 Mg alloy for orthopaedic applications. The multi-step fabrication of coatings first involved dip coating of a passivated AZ31 Mg alloy with a methyltriethoxysilane-tetraethoxysilane sol-gel to deposit a dense, cross-linked and corrosion resistant silane coating (AZ31-MT). The second step was to create an amine-functionalised surface by treating coated alloy with 3-aminopropyl-triethoxy silane (AZ31-MT-A) which facilitated the immobilisation of HA via EDC-NHS coupling reactions at two different concentrations i.e 1 mg.ml−1 (AZ31-MT-A-HA1) and 2 mg.ml−1 (AZ31-MT-A-HA2). These coatings were characterised by Fourier transform infrared spectroscopy, atomic force microscopy and static contact angle measurements which confirmed the successful assembly of the full coatings onto AZ31 Mg alloy. The influence of HA-silane coating on the corrosion of Mg alloy was investigated by electrical impedance spectroscopy and long-term immersion studies measurements in HEPES buffered DMEM. The results showed an enhanced corrosion resistance of HA functionalised silane coated AZ31 substrate over the uncoated equivalent alloy. Furthermore, the cytocompatibility of MC3T3-E1 osteoblasts was evaluated on HA-coated AZ31-MT-A substrates by live-dead staining, quantification of total cellular DNA content, scanning electron microscope and alkaline phosphatase activity. The results showed HA concentration-dependent improvement of osteoblast cellular response in terms of enhanced cell adhesion, proliferation and differentiation. These findings hold great promise in employing such biomimetic multifunctional coatings to improve the corrosion resistance and cytocompatibility of biodegradable Mg-based alloy for orthopaedic applications.

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Acknowledgements

The authors acknowledge Dublin Institute of Technology for the financial support through Fiosraigh Scholarship Programme 2014.

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Authors and Affiliations

  1. Centre for Research in Engineering and Surface Technology, Dublin Institute of Technology, Kevin Street, Dublin 8, Ireland

    Sankalp Agarwal, Brendan Duffy & Swarna Jaiswal

  2. School of Food Science and Environmental Health, Cathal Brugha Street, Dublin Institute of Technology, Dublin 1, Ireland

    Sankalp Agarwal & James Curtin

  3. Trinity Centre for Bioengineering, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin 2, Ireland

    Marie-Noelle Labour & David Hoey

  4. Department of Mechanical and Manufacturing Engineering, School of Engineering, Trinity College Dublin, Dublin 2, Ireland

    Marie-Noelle Labour & David Hoey

  5. Advanced Materials and Bioengineering Research Centre, Royal College of Surgeons in Ireland and Trinity College Dublin, Dublin 2, Ireland

    David Hoey

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  1. Sankalp Agarwal
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  2. Marie-Noelle Labour
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Correspondence to Swarna Jaiswal.

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Agarwal, S., Labour, MN., Hoey, D. et al. Enhanced corrosion resistance and cytocompatibility of biomimetic hyaluronic acid functionalised silane coating on AZ31 Mg alloy for orthopaedic applications. J Mater Sci: Mater Med 29, 144 (2018). https://doi.org/10.1007/s10856-018-6150-5

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