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Forbidden light detection from single molecules

Ruckstuhl1, Enderlein, Jung

  • 1Physikalisch-Chemisches Institut, Universitat Zurich, Switzerland. thomasr@pci.unizh.ch

Analytical Chemistry
|May 18, 2000
PubMed
Summary
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A novel optical module enables ultrasensitive detection of surface fluorescence by collecting over 65% of emitted light. This breakthrough allows for precise monitoring of surface-binding processes and detection of single fluorescent molecules.

Area of Science:

  • Optics
  • Biophysics
  • Analytical Chemistry

Background:

  • Accurate detection of surface-generated fluorescence is crucial for monitoring surface-binding processes.
  • Conventional methods using high-aperture microscope objectives have limitations in fluorescence collection efficiency.

Purpose of the Study:

  • To introduce a new optical module for ultrasensitive detection of surface-generated fluorescence.
  • To enhance fluorescence collection efficiency and minimize detection volume for improved surface-specific measurements.

Main Methods:

  • Development of a novel optical module for fluorescence detection.
  • Characterization of fluorescence collection efficiency.
  • Restriction of detection volume to approximately 10(-17) L.
  • Demonstration of the system's performance by detecting single fluorescent molecules.

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Main Results:

  • Achieved fluorescence collection efficiency exceeding 65%, significantly higher than conventional objectives (44%).
  • Enabled precise discrimination between surface-generated and bulk-generated fluorescence.
  • Demonstrated detection of single fluorescent molecules.
  • Quantified antigen concentrations down to 5 femtomole (fmol).

Conclusions:

  • The new optical module provides a powerful tool for ultrasensitive and surface-specific fluorescence detection.
  • This technology offers significant advantages for studying surface-binding events and low-concentration analytes.
  • The system's performance in detecting single molecules and low antigen concentrations highlights its potential in various analytical applications.