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Related Experiment Videos

Electron multiplying charge-coupled device camera based fluorescence correlation spectroscopy.

Balakrishnan Kannan1, Jia Yi Har, Ping Liu

  • 1Department of Chemistry 3, Science Drive 3, National University of Singapore, Singapore 117543.

Analytical Chemistry
|May 13, 2006
PubMed
Summary
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A new fluorescence correlation spectroscopy (FCS) instrument using an electron multiplying charge-coupled device camera enables multiplexed measurements and microchannel flow analysis. Despite lower time resolution, its versatility offers new possibilities for biophysical studies.

Area of Science:

  • Biophysics
  • Analytical Chemistry
  • Cell Biology

Background:

  • Fluorescence Correlation Spectroscopy (FCS) is a powerful technique for studying molecular dynamics.
  • Conventional FCS instruments often use avalanche photodiodes, limiting multiplexing capabilities.
  • There is a need for versatile FCS setups capable of advanced measurements in complex biological systems.

Purpose of the Study:

  • To build and characterize a novel fluorescence correlation spectroscopy (FCS) setup utilizing an electron multiplying charge-coupled device (EMCCD) camera.
  • To evaluate the capabilities of the EMCCD-based FCS system for multiplexed measurements, microchannel analysis, and spectral FCS.
  • To demonstrate the system's applicability in various media and biological samples, including cellular environments.

Main Methods:

Related Experiment Videos

  • Construction of an FCS setup centered around an EMCCD camera.
  • Characterization of the instrument's performance, including time resolution (4 ms).
  • Acquisition of FCS data from fluorescent dyes, polystyrene beads in viscous media, and epidermal growth factor receptors in cells.

Main Results:

  • The EMCCD-based FCS system successfully performed measurements on various samples.
  • The setup allows for multiplexing of FCS measurements, software-adjustable pinhole, and microchannel flow analysis (speed and direction).
  • Simulations demonstrated the potential for multiplexing focal spots and detection elements.

Conclusions:

  • The developed EMCCD-based FCS instrument offers unique advantages, including multiplexing and microchannel analysis, despite a lower time resolution compared to APD-based systems.
  • The system's flexibility makes it suitable for a range of applications in biophysics and cell biology.
  • Further development could enhance its capabilities for advanced spectral FCS and complex biological investigations.