Oxidative stress plays significant roles in the development of various diseases. H2O2 acts as a signaling molecule physiologically or harmful substance pathologically and the mitochondria are one of the most… Click to show full abstract
Oxidative stress plays significant roles in the development of various diseases. H2O2 acts as a signaling molecule physiologically or harmful substance pathologically and the mitochondria are one of the most active places for the generation of H2O2. Thus, a new mitochondria-targeted probe 1 for H2O2 detection was synthesized herein, based on D-π-A structure with a large Stokes shift (150 nm) due to its ICT process. To improve its water solubility and sensitivity, probe 2 with PEG chain and probe 3 with two responsive boronated groups were then designed based on the structure of probe 1. As a result, the fluorescence intensity of probe 2 was far higher than that of probe 1 and probe 3 not only in vitro experiment but in cell imaging study with a larger linear range and signal-to-noise ratio, rendering it the best probe for further exogenous and endogenous H2O2 detection in Hela cells.
               
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