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Fluorescence background discrimination by prebleaching

T Hirschfeld

    The Journal of Histochemistry and Cytochemistry : Official Journal of the Histochemistry Society
    |January 1, 1979
    PubMed
    Summary
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    New electrooptical techniques reduce background fluorescence in biologic staining. These methods use fluorescence decay lifetime differences or photochemical bleaching for improved contrast and discrimination of fluorescent molecules.

    Area of Science:

    • Biophotonics
    • Fluorescence Microscopy
    • Analytical Chemistry

    Background:

    • Biologic staining often suffers from background fluorescence.
    • Unbound or excess stain can interfere with accurate imaging.
    • Distinguishing between bound and free fluorophores is challenging.

    Purpose of the Study:

    • To describe electrooptical techniques for reducing background fluorescence in biologic staining.
    • To enhance contrast and improve the discrimination of fluorescent molecules.
    • To offer more selective, sensitive, and convenient methods for fluorescence analysis.

    Main Methods:

    • Utilizing differences in fluorescence decay lifetime between bound and unbound stain.
    • Employing gated photometry schemes to measure fluorescence decay lifetimes.

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  • Applying photochemical bleaching of fluorescent dyes under intense light exposure.

    • Main Results:

    • Demonstrated substantial enhancement of sample-background contrast.
    • Achieved improved selectivity and sensitivity in discriminating fluorescent molecules.
    • Developed more convenient methods for analyzing diverse fluorescent samples.

    Conclusions:

    • Electrooptical techniques effectively suppress background fluorescence in biologic samples.
    • Fluorescence decay lifetime measurements offer a powerful tool for enhancing image quality.
    • Photochemical bleaching provides an alternative, highly selective method for fluorophore analysis.