Abstract
Aberrant production of H2O2 is involved in cancer. The levels of H2O2 are significantly higher in tumor cells than in normal cells. It is important to develop fluorescent probes to image basal H2O2 selectively in tumor cells. So far, a cancer cell-targeting probe to image basal H2O2 has not been reported. Thus, we developed a fluorescent probe, BBHP, which contains benzil as a H2O2-recognition site and biotin as a target binding motif for the selective and sufficient detection of H2O2 in tumor cells. BBHP enables a selective fluorescence turn-on response to H2O2. The binding of the probe with biotin receptors can greatly accelerate the fluorescence response to H2O2. As a result, BBHP can sufficiently image basal H2O2 in biotin receptor-positive cancer cells and tumor tissues. Finally, BBHP was successfully applied to discriminate between cancerous and normal tissues.
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