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Turn-on Fluorescent Probe for Exogenous and Endogenous Imaging of Hypochlorous Acid in Living Cells and Quantitative Application in Flow Cytometry.
Analytical Chemistry 2017 September 6
Hypochlorous acid (HClO) acts as a dominant microbicidal mediator in the natural immune system, and the excess production of hypochlorites is related to a series of diseases. Thus, it is vitally important and necessary to develop a highly sensitive and selective method for HClO detection in living systems, and most of fluorescent probes are mainly focused on cells imaging. Besides, accurate HClO quantitative information about individual cells in a large cell population is extremely important for understanding inflammation and cellular apoptosis as well. In our work, a turn-on fluorescent probe has been synthesized, which can selectively and sensitively detect HClO with fast response time. The probe is almost nonfluorescent possibly due to both the spirolactam form of fluorescein and unbridged C═N bonds which can undergo a nonradiative decay process in the excited state. Upon the addition of ClO(-), the probe was oxidized to ring-opened fluorescent form and the fluorescence intensity was greatly enhanced. In live cell experiments, the probe was successfully applied to image exogenous ClO(-) in HeLa cells and endogenous HClO in RAW 264.7 macrophage cells. In particular, the quantitative information on exogenous and endogenous HClO can also be acquired in flow cytometry. Therefore, the probe not only can image exogenous and endogenous HClO but also provides a new and promising platform to quantitatively detect HClO in flow cytometry.
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