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High water content silk protein-based hydrogels with tunable elasticity fabricated via a Ru(II) mediated photochemical cross-linking method

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Abstract

Silk is very promising in the field of biomaterials as a natural biomacromolecule. Silk protein can be made into various forms of materials, including hydrogels. However, silk protein-based hydrogels have not attracted much attention due to its weak mechanical properties. Here, we report high water content silk protein-based hydrogels with tunable elasticity which were fabricated through Ru(II) mediated photochemically cross-linking tyrosine residues in regenerated silk protein. The regenerated silk protein was characterized by Fourier transform infrared spectroscopy (FTIR). The gelation kinetics of the silk protein was studied by rheology measurements. The compressive mechanical properties of the silk protein-based hydrogels was investigated using compressive tests and dynamic mechanical analysis (DMA). Compressive modulus of the hydrogels reached 349±64 MPa at 15 % strain. The fabricated silk protein-based hydrogels were also characterized by Scanning electron microscopy (SEM), revealing an interconnected porous network structure, typical of hydrogels, with an average pore size of approximately 130 μm. Finally, biocompatibility of the silk protein-based hydrogels was demonstrated through cell culture studies using a human fibroblast cell line, HFL1. The reported silk protein-based hydrogels represent a promising candidate for biomaterial applications.

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Authors and Affiliations

  1. State Key Laboratory of Organic-inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, China

    Di Zhang, Han Peng, Baochang Sun & Shanshan Lyu

  2. Department of Chemistry, University of British Columbia, Vancouver, BC, V6T1Z1, Canada

    Shanshan Lyu

Authors
  1. Di Zhang
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  2. Han Peng
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  3. Baochang Sun
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  4. Shanshan Lyu
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Correspondence to Baochang Sun or Shanshan Lyu.

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Zhang, D., Peng, H., Sun, B. et al. High water content silk protein-based hydrogels with tunable elasticity fabricated via a Ru(II) mediated photochemical cross-linking method. Fibers Polym 18, 1831–1840 (2017). https://doi.org/10.1007/s12221-017-7463-6

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  • DOI: https://doi.org/10.1007/s12221-017-7463-6

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