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DAPI staining improved for quantitative cytofluorometry.

S Hamada, S Fujita

    Histochemistry
    |January 1, 1983
    PubMed
    Summary
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    This study enhances 4

    Area of Science:

    • Cell Biology
    • Molecular Biology
    • Biochemistry

    Background:

    • 4',6-diamidino-2-phenylindole (DAPI) is a fluorescent stain used for DNA visualization.
    • DAPI staining is simple and does not require hydrolysis.
    • Previous limitations of DAPI for quantitative analysis included nonspecific fluorescence, light scattering, and photobleaching.

    Purpose of the Study:

    • To overcome the limitations of DAPI staining for accurate DNA quantification.
    • To optimize DAPI staining protocols for quantitative cytofluorometry.

    Main Methods:

    • Reducing DAPI concentration to 50 ng/ml to eliminate cytoplasmic fluorescence.
    • Incorporating electron donors and SH radical molecules into mounting media to decrease fluorescence decay.
    • Minimizing excitation light intensity to reduce light scattering.

    Related Experiment Videos

    Main Results:

    • Nonspecific cytoplasmic fluorescence was successfully eliminated.
    • Fluorescence decay was significantly reduced, improving stability.
    • Light scattering was minimized, enhancing signal clarity.

    Conclusions:

    • Optimized DAPI staining protocols enable precise DNA quantification.
    • Epifluorescent cytophotometry with modified DAPI staining is suitable for accurate DNA measurement.