Fujioka Hiroyoshi, Sakamoto Ryo, Hiramatsu Kotaro, Murakami Yusuke, Masaki Minori, Kawatani Minoru, Matsumoto Satoshi, Kojima Ryosuke, Urano Yasuteru, Kano Hideaki, Kamiya Mako
Laboratory for Chemistry and Life Science, Institute of Integrated Research, Institute of Science Tokyo, Kanagawa 226-8501, Japan.
Department of Life Science and Technology, Institute of Science Tokyo, Kanagawa 226-8501, Japan.
Anal Chem. 2025 Aug 19;97(32):17589-17597. doi: 10.1021/acs.analchem.5c02714. Epub 2025 Aug 11.
Coumarin-hemicyanine (CHC) hybrid fluorophores bearing an intramolecular nucleophile have been reported as ratiometric fluorescent probes based on the equilibrium between the π-conjugated open and cyclic closed forms. Here, we report red-shifted CHC derivatives that can serve as scaffold dyes of activated fluorescent probes and activated Raman probes. We prepared a series of cyano-substituted CHC derivatives and found that substitution at C-4 of the coumarin moiety is effective in extending the absorption wavelength. The near-infrared (NIR) emission of these 4CN-CHC derivatives exhibits high tissue penetration. Dual-color imaging with 4CN-CHC enabled ratiometric monitoring of the lysosomal pH changes. Furthermore, the coherent anti-Stokes Raman scattering (CARS) signals of 4CN-CHC derivatives could be regulated by modifying the open/closed equilibrium, and the different patterns of CARS spectra enabled us to perform multicomponent imaging. Thus, these 4CN-CHC derivatives expand the repertoire of functional probes for NIR and multiplexed vibrational imaging.
据报道,带有分子内亲核试剂的香豆素 - 半菁(CHC)杂化荧光团是基于π共轭开放和环状封闭形式之间的平衡的比率荧光探针。在此,我们报道了红移的CHC衍生物,其可作为活化荧光探针和活化拉曼探针的支架染料。我们制备了一系列氰基取代的CHC衍生物,发现香豆素部分C-4位的取代对于延长吸收波长是有效的。这些4CN-CHC衍生物的近红外(NIR)发射表现出高组织穿透性。用4CN-CHC进行双色成像能够对溶酶体pH变化进行比率监测。此外,4CN-CHC衍生物的相干反斯托克斯拉曼散射(CARS)信号可通过改变开放/封闭平衡来调节,并且不同的CARS光谱模式使我们能够进行多组分成像。因此,这些4CN-CHC衍生物扩展了用于近红外和多重振动成像的功能探针库。
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