Journal
CHINESE CHEMICAL LETTERS
Volume 31, Issue 11, Pages 2980-2984Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cclet.2020.08.016
Keywords
Fluorescent probes; High sensitivity; Hypochlorous acid (HOCl); Large Stokes shift; Fluorescence imaging
Categories
Funding
- National Natural Science Foundation of China [21877029, 21735001]
- National Key R&D Program of China [2019YFA0210103]
- National Postdoctoral Program for Innovative Talents [BX20190110]
- China Postdoctoral Science Foundation [2019M662758]
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Fluorescent probes have been widely employed in biological imaging and sensing. However, it is always a challenge to design probes with high sensitivity. In this work, based on rhodamine skeleton, we developed a general strategy to construct sensitivity-enhanced fluorescent probe with the help of theoretical calculation for the first time. As a proof of concept, we synthesized a series of HOCl probes. Experiment results showed that with the C-9 of pyronin moiety of rhodamine stabilized by an electron donor group, probe DQF-S exhibited an importantly enhanced sensitivity (LOD: 0.2 nmol/L) towards HOCl together with fast response time (10 s). Moreover, due to the breaking symmetrical electron distribution by another electron donor group, the novel rhodamine probe DQF-S displayed a far red to near-infrared emission (650 nm) and large Stokes shift. Bioimaging studies indicated that DQF-S can not only effectively detect basal HOCl in various types of cells, but also be successfully applied to image tumor tissue in vivo. These results demonstrate the potential of our design as a useful strategy to develop excellent fluorescent probes for bioimaging. (C) 2020 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.
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