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. Author manuscript; available in PMC: 2020 Sep 5.
Published in final edited form as: Adv Funct Mater. 2019 Jul 8;29(36):1903753. doi: 10.1002/adfm.201903753

Figure 6.

Figure 6.

Chemical structure of the two NIR fluorescence dyes a) IRDye 800CW Maleimide and b) IRDye 680LT maleimide used for labeling Gel-SH and HA-SH, respectively. c) In vitro two-color NIR imaging of the composite labeled hydrogel. d) No detectable photobleaching of dyes could be observed over a period of 7 days. e) Two-color NIR images of individual hydrogel component degradation over time, showing collagenase specificity for gelatin. For quantification, data were normalized to day 0 (before collagenase addition).