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Tuning the Baird aromatic triplet-state energy of cyclooctatetraene to maximize the self-healing mechanism in organic fluorophores.


ABSTRACT: Bright, photostable, and nontoxic fluorescent contrast agents are critical for biological imaging. "Self-healing" dyes, in which triplet states are intramolecularly quenched, enable fluorescence imaging by increasing fluorophore brightness and longevity, while simultaneously reducing the generation of reactive oxygen species that promote phototoxicity. Here, we systematically examine the self-healing mechanism in cyanine-class organic fluorophores spanning the visible spectrum. We show that the Baird aromatic triplet-state energy of cyclooctatetraene can be physically altered to achieve order of magnitude enhancements in fluorophore brightness and signal-to-noise ratio in both the presence and absence of oxygen. We leverage these advances to achieve direct measurements of large-scale conformational dynamics within single molecules at submillisecond resolution using wide-field illumination and camera-based detection methods. These findings demonstrate the capacity to image functionally relevant conformational processes in biological systems in the kilohertz regime at physiological oxygen concentrations and shed important light on the multivariate parameters critical to self-healing organic fluorophore design.

SUBMITTER: Pati AK 

PROVIDER: S-EPMC7533661 | biostudies-literature | 2020 Sep

REPOSITORIES: biostudies-literature

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Tuning the Baird aromatic triplet-state energy of cyclooctatetraene to maximize the self-healing mechanism in organic fluorophores.

Pati Avik K AK   El Bakouri Ouissam O   Jockusch Steffen S   Zhou Zhou Z   Altman Roger B RB   Fitzgerald Gabriel A GA   Asher Wesley B WB   Terry Daniel S DS   Borgia Alessandro A   Holsey Michael D MD   Batchelder Jake E JE   Abeywickrama Chathura C   Huddle Brandt B   Rufa Dominic D   Javitch Jonathan A JA   Ottosson Henrik H   Blanchard Scott C SC  

Proceedings of the National Academy of Sciences of the United States of America 20200910 39


Bright, photostable, and nontoxic fluorescent contrast agents are critical for biological imaging. "Self-healing" dyes, in which triplet states are intramolecularly quenched, enable fluorescence imaging by increasing fluorophore brightness and longevity, while simultaneously reducing the generation of reactive oxygen species that promote phototoxicity. Here, we systematically examine the self-healing mechanism in cyanine-class organic fluorophores spanning the visible spectrum. We show that the  ...[more]

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