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. 2020 Sep 19;6(3):627–637. doi: 10.1016/j.bioactmat.2020.08.026

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© 2020 The Authors. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co., Ltd.

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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Fig. 1 — Chemical construction, rheological and mechanical characterization of the hydrogel. (A) FTIR spectra of GelMA and GelMA-imid at different concentrations. (B) Time-sweep sequence of hydrogel. (C) Frequency-sweep sequence of hydrogel. (D) Stress-strain curve of hydrogel. (E) In vitro degradation behavior of hydrogel in PBS. (F) In vitro release curve of SDF-1α. (G) Shear-thinning properties characterized by viscosity change (shear rate 0.1 and 100 Hz). (H) Hydrogel appearance (Left: GelMA-imid hydrogel; Right: GelMA-imid/SDF-1α/hAMSCs hydrogel). (I) “Brain” written by hydrogel through a 26G needle.