In
this study, thermoresponsive and mussel-inspired polypeptides
were synthesized using ring-opening polymerization of α-amino
acid derivatives of N-carboxyanhydride (NCA). The
tissue adhesive properties of these polypeptides were evaluated using
in vitro adhesive strength tests on porcine skin and bone. The results
indicated that the species of the functional polypeptide side groups
and the adhesive temperature have a significant influence on the adhesion
strength. The maximum of the lap-shear adhesion strength on porcine
skin was 101.2 kPa, and the maximum of tensile adhesion strength on
bone was 603 kPa. The in vivo antibleeding activity and tissue adhesive
ability were also evaluated using a rat model. These polypeptides
exhibited superior hemostatic properties and healing effects in the
skin incision and osteotomy gap, and the skin incision healing and
osteotomy gap remodeling were completed in all rats after 2–9
weeks. These polypeptides are expected to be good candidates for surgical
tissue adhesives, tissue engineering materials, and antibleeding materials,
etc.
A series of reversible triblock poly(amino acid)s hydrogels with tunable pH‐responsivity (pH 3.5–10.0) were synthesized by adjusting the ratio of the blocks. Attributing to the good biodegradability and low cytotoxicity of these triblock poly(amino acid)s, it is obvious that these poly(amino acid)s are potential novel materials in drug delivery and injectable hydrogels.
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