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Related Experiment Videos

Highly sensitive biosensing using a supercritical angle fluorescence (SAF) instrument.

Thomas Ruckstuhl1, Michael Rankl, Stefan Seeger

  • 1Physikalisch-Chemisches Institut, Universität Zürich, Winterthurerstr. 190, CH-8057, Zürich, Switzerland. t.ruckstuhl@pci.unizh.ch

Biosensors & Bioelectronics
|June 6, 2003
PubMed
Summary

This study introduces a novel optical biosensor for detecting molecular binding at interfaces. The biosensor achieves high sensitivity and selectivity, enabling real-time analysis of reactions down to 10(-13) mol/l.

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Area of Science:

  • Biomedical Engineering
  • Analytical Chemistry
  • Optical Physics

Background:

  • Surface-based molecular binding assays are crucial in biological and biochemical research.
  • Existing methods often struggle with sensitivity and distinguishing surface-bound signals from bulk solution signals.

Purpose of the Study:

  • To develop and demonstrate a new optical biosensor for probing molecular binding kinetics at a water/glass interface.
  • To achieve sensitive and selective detection of surface-bound molecules at low analyte concentrations.

Main Methods:

  • Utilized supercritical angle fluorescence (SAF) collection to confine detection to the interface.
  • Employed an inverted optical design with a parabolic lens for efficient signal capture.
  • Performed real-time measurements of antibody-antigen reactions.

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Main Results:

  • Successfully rejected bulk fluorescence, significantly reducing the detection volume.
  • Achieved high spatial collection efficiency and detection sensitivity.
  • Demonstrated real-time kinetic analysis and detected antigen concentrations as low as 10(-13) mol/l.

Conclusions:

  • The developed optical biosensor offers a sensitive and selective platform for studying interfacial molecular interactions.
  • The system's design facilitates ease of use for biological and biochemical applications.
  • The biosensor's performance in detecting antibody-antigen reactions highlights its potential for various bioanalytical assays.