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Related Experiment Videos

Attogram detection limit for aqueous dye samples by laser-induced fluorescence.

N J Dovichi, J C Martin, J H Jett

    Science (New York, N.Y.)
    |February 18, 1983
    PubMed
    Summary

    Scientists achieved ultra-sensitive detection of rhodamine 6G using a modified flow cytometer and laser-induced fluorescence, reaching attogram levels.

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    Area of Science:

    • Analytical Chemistry
    • Biophysics

    Background:

    • Flow cytometry is a powerful technique for analyzing single cells and particles.
    • Laser-induced fluorescence (LIF) enhances detection sensitivity for fluorescent molecules.

    Purpose of the Study:

    • To develop a highly sensitive method for detecting attogram quantities of rhodamine 6G.
    • To improve upon existing detection limits using a modified flow cytometer.

    Main Methods:

    • Utilized a modified flow cytometer for analysis.
    • Employed laser-induced fluorescence (LIF) for detection.
    • Quantified aqueous rhodamine 6G at the attogram level.

    Main Results:

    • Achieved a detection limit of 28 attograms (35,000 molecules) of rhodamine 6G.
    • Established a concentration detection limit of 1.4 x 10(-13) mole per liter.
    • Sampled 0.42 microliters in a 1-second measurement period with high precision.

    Conclusions:

    • The modified flow cytometer significantly enhances detection sensitivity for fluorescent analytes.
    • This method offers a substantial improvement over previous rhodamine 6G detection techniques.
    • The technique holds potential for sensitive quantification in various scientific applications.

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