A new hydroxynaphthalimide-based merocyanine dye for imaging a mitochondrial viscosity in living cellsстатьяИсследовательская статья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 1 октября 2025 г.
Аннотация:A new derivative of 3-styryl-4-hydroxynaphthalimide NI-Qu has been synthesized. It absorbs in the red region and exhibits long wavelength fluorescence, sensitive to the viscosity and polarity of the medium. The protonated and deprotonated forms of the dye were characterized by optical spectroscopy and NMR. It is shown that the deprotonated form of NI-Qu exhibits pronounced negative solvatochromism in organic solvents. NI-Qu demonstrates a 107-fold increase in fluorescence intensity at 695 nm during changing viscosity of glycerol-water mixtures from 0.89 cP to 906 cP with a linear dependence of the fluorescence quantum yield on viscosity over the entire viscosity range studied. Experiments in vitro showed low cytotoxicity of NI-Qu and its applicability as a selective fluorescent probe for viscosity in mitochondria in living cells.