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. Author manuscript; available in PMC: 2018 Nov 12.
Published in final edited form as: Biomacromolecules. 2017 Feb 1;18(2):562–567. doi: 10.1021/acs.biomac.6b01715

Figure 3. pH-responsive fluorescence reversibility of tin or free base porphyrin hydrogels.

Figure 3.

Fluorescence emission (normalized to initial emission after formation) of tin porphyrin-PEG hydrogels (top row) or freebase porphyrin-PEG hydrogels (bottom row) placed in 100 mM sodium phosphate solutions of indicated pH (A; E) and after one week of storage (B; F). Emission in the presence of 10% fetal bovine serum (FBS) (C; G). and after one week of storage in FBS (D and H). Data show mean +/− std. dev. for n=3 separate polymerization reactions.