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Principles of fluorescence polarization measurements
Analytical and Quantitative Cytology
|December 1, 1981
Summary
High-speed flow cytometry uses fluorescence polarization for cellular biology. This study addresses systematic depolarization effects and anisotropic fluorescence emission for improved accuracy in flow systems.
Area of Science:
- Cellular Biology
- Biophysics
- Optical Physics
Background:
- Fluorescence polarization (FP) is increasingly utilized in high-speed single-cell flow cytometry for cellular biology research.
- Standard flow cytometry setups often exhibit systematic depolarization effects due to optical configurations.
- Anisotropic fluorescence emission from structured particles complicates polarization measurements.
Purpose of the Study:
- To investigate and address systematic depolarization effects in fluorescence polarization measurements within flow cytometry.
- To analyze the impact of detection axis orientation on polarized fluorescence emission anisotropy.
Main Methods:
- Utilized high-speed single-cell flow cytometry.
- Employed fluorescence polarization measurements.
- Analyzed optical configurations and their influence on depolarization.
Main Results:
- Identified complexities in numerical correction of systematic depolarization effects.
- Observed remarkable anisotropies in polarized fluorescence emission dependent on detection axis direction.
- Highlighted challenges in standard flow systems due to optical asymmetry.
Conclusions:
- Accurate correction of depolarization effects is crucial for reliable FP measurements in flow cytometry.
- Understanding fluorescence emission anisotropy is essential for interpreting FP data from structured particles.
- Further optimization of optical systems is needed to mitigate systematic errors in FP-based flow cytometry.