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. Author manuscript; available in PMC: 2017 Jun 28.
Published in final edited form as: Adv Funct Mater. 2016 Apr 15;26(23):4113–4123. doi: 10.1002/adfm.201600236

Figure 2.

Figure 2

SELP dynamic hydrogel schematics and structural characterization. (a) Mechanism of HRP-mediated SELP gelation: the formation of inter- and intramolecular covalent crosslinks (black lines) between elastin blocks allows for chain extension for stimuli responsive hydrogels. (b) Real-time FTIR spectra of S2E8R during gelation suggest the formation of the SELP hydrogel is not based on β-sheet crosslinks. Fluorescence excitation-emission spectra of (c) S2E8Y solution and (d) S2E8Y hydrogel confirmed the formation of dityrosines between the elastin blocks. (e) The resultant S2E8Y hydrogels are optically clear and exhibit blue fluorescence when irradiated with UV, a feature not present in the precursor protein solution.