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Related Experiment Videos

Phosphorescence decay time measurements using intensity correlation spectroscopy.

Goro Nishimura1, Chan-Gi Pack, Mamoru Tamura

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

Experimental and Molecular Pathology
|March 10, 2007
PubMed
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This study introduces a novel correlation method for measuring oxygen dynamics in cells using phosphorescence. The technique effectively analyzes oxygen levels and phosphorescent probe behavior within biological samples.

Area of Science:

  • Biophysics
  • Cell Biology
  • Photochemistry

Background:

  • Phosphorescence measurements offer a sensitive method for probing cellular environments.
  • Fluorescence correlation spectroscopy (FCS) is a powerful tool for analyzing molecular dynamics.
  • Understanding cellular oxygen dynamics is crucial for various biological processes.

Purpose of the Study:

  • To develop and validate a correlation method for phosphorescence measurements to analyze oxygen dynamics in cells.
  • To investigate the behavior of phosphorescent probes within cellular environments.
  • To assess changes in intracellular oxygen concentration under different physiological conditions.

Main Methods:

  • Utilized a correlation method, an expansion of fluorescence correlation spectroscopy (FCS).

Related Experiment Videos

  • Measured intensity correlation functions of emission excited by a pulsed light source.
  • Analyzed fluorescence correlation functions and phosphorescence decay times by adjusting pulse timing.
  • Applied the method to HeLa cells stained with Pd(II)-porphine.

    • Main Results:

    • The phosphorescence decay function exhibited two exponential components, suggesting distinct populations of the phosphorescent probe (free and protein-bound Pd(II)-porphine).
    • Successfully measured relative changes in intracellular oxygen concentration under normal and uncoupled respiration.
    • Demonstrated the method's applicability for analyzing oxygen dynamics in biological systems.

    Conclusions:

    • The developed correlation method provides a simple yet effective approach for studying cellular oxygen dynamics.
    • The technique allows for the differentiation of probe states within cells based on decay kinetics.
    • The method holds potential for high-temporal-resolution measurements, down to the nanosecond range.