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Multicomponent fluorometric analysis using a fiber-optic probe.

F V Bright, K S Litwiler

    Analytical Chemistry
    |July 15, 1989
    PubMed
    Summary
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    This study introduces phase-resolved fluorometry for accurately quantifying mixtures of similar fluorescent molecules. The technique successfully identifies components in complex samples, even with background noise.

    Area of Science:

    • Analytical Chemistry
    • Spectroscopy
    • Biophysics

    Background:

    • Quantifying spectrally similar fluorophores in mixtures is challenging.
    • Traditional methods often struggle with complex samples and background interference.

    Purpose of the Study:

    • To develop and validate a method for precise quantification of mixed fluorophores using phase-resolved fluorometry.
    • To assess the technique's performance with binary, ternary, and quaternary mixtures.
    • To demonstrate ambient light rejection capabilities.

    Main Methods:

    • Utilizing single-frequency phase-resolved fluorometry.
    • Employing single and bifurcated fiber-optic probes.
    • Analyzing correlation plots for mixture component analysis.

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    Main Results:

    • Achieved correlation coefficients > 0.98 and standard errors < 0.13 microM for 80 binary mixtures.
    • Successfully quantified fluorophores at up to 10:1 molar ratios with lifetime separations < 200 ps.
    • Demonstrated simultaneous quantification in ternary and quaternary mixtures.
    • Showcased effective ambient light rejection for Rhodamine 6G detection.

    Conclusions:

    • Phase-resolved fluorometry provides a robust method for analyzing complex fluorophore mixtures.
    • The technique offers high accuracy and sensitivity, even in the presence of interfering signals.
    • Fiber-optic probes enhance the applicability and versatility of this analytical approach.