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Multiple wavelength illumination in flow cytometry using a single arc lamp and a dispersing element
B G de Grooth1, M van Dam, N C Swart
1Department of Applied Physics, Twente University of Technology, Enschede, The Netherlands.
Cytometry
|September 1, 1987
Summary
This study introduces a novel multi-wavelength illumination method for flow cytometry, combining lasers and arc lamps for enhanced cellular analysis. The system enables precise measurements of light scattering and fluorescence for applications like pH and DNA/protein quantification.
Area of Science:
- Biophysics
- Cell Biology
- Analytical Chemistry
Background:
- Traditional flow cytometry often relies on single illumination sources, limiting spectral analysis.
- Multiple wavelength illumination can provide richer data for complex cellular measurements.
Purpose of the Study:
- To describe a new multiple wavelength illumination method for flow cytometers.
- To demonstrate its utility in measuring light scattering, intracellular pH, and simultaneous DNA/protein content.
Main Methods:
- Utilized a combination of a helium-neon laser and a dispersed arc lamp for illumination.
- Implemented two experimental setups: orthogonal detection and epi-illumination.
- Employed prism dispersion to image different colors at various points on the sample stream.
Main Results:
- Demonstrated wavelength-dependent orthogonal scattering from erythrocytes.
- Successfully measured intracellular pH using fluorescein's pH-dependent excitation spectrum.
- Achieved simultaneous DNA and protein measurement in cells using dual-color fluorescence with overlapping emission spectra.
Conclusions:
- The developed multiple wavelength illumination method enhances flow cytometry capabilities.
- The system is versatile for various cellular analyses, including scattering, pH, and multi-parameter fluorescence.
- This technique offers improved spectral resolution and multiplexing potential for biological samples.