An indicator displacement assay, namely polymeric PNPY-n/UD consisting of a cationic polynorbornene backbone with pyridinium functional groups (PNPY-1,2,3) and an anionic uranine dye (UD) as an indicator, has been developed for highly sensitive "turn-on" fluorescence sensing of ATP. While PNPY-1/UD itself is non-emissive, a bright green fluorescence signal was observed in the presence of ATP [ = 2.17 × 10 M, LOD = 5.7 nM]. The potential of a highly photostable system PNPY-1/UD was also validated in detecting ATP levels in live-cell imaging applications.
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