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. Author manuscript; available in PMC: 2019 Sep 1.
Published in final edited form as: Biomaterials. 2018 May 4;178:383–400. doi: 10.1016/j.biomaterials.2018.05.003

Fig. 4. Photoluminescent citrate-based materials.

Fig. 4

(A) Schematic representation of BPLP synthesis and photoluminescent polymeric framework after thermal cross-linking. (B) Two distinct types of fluorescent moiety: a thiozolopryidine (TPA) family such as CA-Cys and a dioxopyridine (DPR) family such as CA-Ser. (C) Chloride quenches the fluorescence of CA-Cys strictly under acidic conditions. (D) Comparison of quenching efficiency of common ions to the fluorescence of CA-Cys at pH 1.3 (Panel C and D adapted from figure 2 of Reference 40 with permission from the Royal Society of Chemistry).