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High-throughput single-cell fluorescence spectroscopy.

Dragan Isailovic1, Hung-Wing Li, Gregory J Phillips

  • 1Ames Laboratory-USDOE and Department of Chemistry, Iowa State University, Ames, Iowa 50011, USA.

Applied Spectroscopy
|February 22, 2005
PubMed
Summary
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This study introduces a novel high-throughput method for single-cell fluorescence spectroscopy. The technique accurately measures spectra from bacterial cells, offering improved sensitivity and resolution over flow cytometry.

Area of Science:

  • Microbiology
  • Spectroscopy
  • Biotechnology

Background:

  • Accurate single-cell fluorescence measurements are crucial for understanding cellular processes.
  • Existing methods like flow cytometry have limitations in throughput, sensitivity, and spectral resolution.

Purpose of the Study:

  • To develop and validate a high-throughput method for measuring single-cell fluorescence spectra.
  • To demonstrate the method's capability in analyzing bacterial cells expressing fluorescent proteins.

Main Methods:

  • Utilizing a 488 nm laser for excitation and a 20x microscope objective for imaging bacterial cells in a capillary tube.
  • Employing a transmission diffraction grating and an intensified charge-coupled device (ICCD) camera to record fluorescence orders.
  • Reconstructing single-cell spectra from the spatial and intensity information of the recorded fluorescence orders.

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Main Results:

  • Successfully reconstructed emission spectra of E. coli cells expressing green fluorescent protein (GFP).
  • Recorded fluorescence spectra of E. coli cells incubated with R-phycoerythrin (R-PE) and phycoerythrobilin (PEB) chromophore.
  • Demonstrated good agreement between the new method's results and conventional spectroscopy/microscopy.

Conclusions:

  • The developed method offers higher throughput, enhanced sensitivity, and superior spectral resolution compared to flow cytometry for single-cell fluorescence spectral acquisition.
  • This technique provides a valuable tool for detailed analysis of cellular fluorescence at the single-cell level.