Visualizing cellular sodium hydrosulfite (Na2S2O4) using azo-based fluorescent probes with a high signal-to-noise ratio.

Developing a reliable method to detect Na₂S₂O₄ in real time is of great importance for the in-depth study of its toxicity to humans and to allow it to be safely handled. Currently, research on the fluorescence imaging of Na₂S₂O₄ is very scarce. Herein, we present azo-based turn-on fluorescent probes with a high signal-to-noise ratio (emission enhancement ＞100-fold) for the visualization of Na₂S₂O₄ in living cells. [ABSTRACT FROM AUTHOR]