Self-Healing, Self-Assembled β-Sheet Peptide-Poly(γ-glutamic acid) Hybrid Hydrogels

Journal of the American Chemical Society
David E ClarkeMolly M Stevens

Abstract

Self-assembled biomaterials are an important class of materials that can be injected and formed in situ. However, they often are not able to meet the mechanical properties necessary for many biological applications, losing mechanical properties at low strains. We synthesized hybrid hydrogels consisting of a poly(γ-glutamic acid) polymer network physically cross-linked via grafted self-assembling β-sheet peptides to provide non-covalent cross-linking through β-sheet assembly, reinforced with a polymer backbone to improve strain stability. By altering the β-sheet peptide graft density and concentration, we can tailor the mechanical properties of the hydrogels over an order of magnitude range of 10-200 kPa, which is in the region of many soft tissues. Also, due to the ability of the non-covalent β-sheet cross-links to reassemble, the hydrogels can self-heal after being strained to failure, in most cases recovering all of their original storage moduli. Using a combination of spectroscopic techniques, we were able to probe the secondary structure of the materials and verify the presence of β-sheets within the hybrid hydrogels. Since the polymer backbone requires less than a 15% functionalization of its repeating units with β-sheet p...Continue Reading

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Citations

Apr 1, 2018·Angewandte Chemie·David E ClarkeOren A Scherman
Oct 27, 2017·Chemical Communications : Chem Comm·Shuang ZhangQigang Wang
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Methods Mentioned

BETA
circular dichroism
Infrared Spectroscopy
rheology
scanning electron microscopy

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