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Related Experiment Videos

Dead-time distortion in fluorescence correlation measurements.

Goro Nishimura1, Masataka Kinjo

  • 1Research Institute for Electronic Science, Hokkaido University, N12W6, Sapporo 060-0812, Japan. gnishi@imd.es.hokudai.ac.jp

Applied Optics
|July 13, 2005
PubMed
Summary

Detector dead time distorts fluorescence correlation functions, reducing correlation amplitude. This effect, unlike photokinetic saturation, impacts molecule number more than diffusion time, necessitating careful error estimation in fluorescence studies.

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Area of Science:

  • Analytical Chemistry
  • Physical Chemistry
  • Biophysics

Background:

  • Fluorescence correlation spectroscopy (FCS) is a powerful technique for studying molecular dynamics in solution.
  • Detector dead time, an artifact in signal processing, can significantly impact FCS measurements.
  • Understanding and correcting for dead time effects are crucial for accurate data interpretation.

Purpose of the Study:

  • To investigate the impact of detector dead time on fluorescence correlation functions.
  • To differentiate dead time distortions from photokinetic saturation effects.
  • To develop methods for estimating systematic errors caused by dead time.

Main Methods:

  • Analysis of fluorescence correlation functions obtained from fluorescent particles in solution.

Related Experiment Videos

  • Comparison of dead time effects with high-power excitation (saturation) effects.
  • Empirical modeling of deviations in molecular number and diffusion time based on fluorescence intensity linearity.

    • Main Results:

    • Detector dead time significantly reduces the correlation amplitude.
    • Dead time causes deviations in the number of molecules and diffusion time, empirically linked to fluorescence intensity linearity.
    • The proportionality between molecule number and fluorophore concentration is lost with significant dead time, unlike diffusion time proportionality.

    Conclusions:

    • Detector dead time introduces systematic errors in FCS measurements, particularly affecting the accurate determination of molecular numbers.
    • The dead time effect is distinct from photokinetic saturation, impacting different parameters of the correlation function.
    • Reducing excitation power to maintain fluorescence intensity linearity is a practical approach to minimize dead time distortions.