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. Author manuscript; available in PMC: 2016 Mar 9.
Published in final edited form as: Biomacromolecules. 2015 Feb 10;16(3):798–806. doi: 10.1021/bm501710e

Figure 1.

Figure 1

Photoresponsive hydrogels are formed using Michael addition reactions between multi-arm PEG vinylsulfones (PEG-VS) and thiol-containing peptides in 0.1 M HEPES buffer at pH 7.8. The schematic above represents an off-stoichiometry formulation. The crossover of the storage (G’) and the loss (G”) modulus occurs within minutes, and the gel evolution plateaus within 15 minutes.