Abstract
Hydrogen polysulfides (H2Sn, n≥2) is recently regarded as a potential signaling molecule which shows a higher efficiency than hydrogen sulfides (H2S) in regulating enzymes and ion channels. However, the development of specific fluorescent probes for H2Sn with long-wavelength emission (>600nm) are still rare. In this work, a semi-naphthorhodafluor-based red-emitting fluorescent probe SNARF-H2Sn containing a phenyl 2-(benzoylthio) benzoate responsive unit was constructed. SNARF-H2Sn was capable of selectively detecting H2Sn over other reactive sulfur species. Treatment with H2Sn would result in a>1000-fold fluorescence enhancement within 10min. SNARF-H2Sn showed a low limit of detection down to 6.7nM, and further enabled to visualize exogenous/endogenous H2Sn in living A549 cells and zebrafish.
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