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Related Experiment Videos

Femtomolar sensitivity using a channel-etched thin film waveguide fluoroimmunosensor

T E Plowman1, W M Reichert, C R Peters

  • 1Department of Biomedical Engineering, Duke University, Durham, NC 27708-0281, USA.

Biosensors & Bioelectronics
|January 1, 1996
PubMed
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This study introduces a novel evanescent fluoroimmunoassay achieving femtomolar sensitivity for analyte detection. The integrated optical waveguide sensor demonstrates unprecedented detection limits for biomolecules.

Area of Science:

  • Biomedical Engineering
  • Analytical Chemistry
  • Optoelectronics

Background:

  • Accurate detection of low-concentration analytes is crucial in diagnostics and research.
  • Existing immunosensing technologies often struggle to reach femtomolar detection levels.
  • Integrated optical waveguides offer potential for sensitive biosensing applications.

Purpose of the Study:

  • To develop and validate a novel evanescent fluoroimmunoassay for ultra-sensitive analyte detection.
  • To demonstrate femtomolar (sub-part-per-trillion) detection capabilities using an integrated optical waveguide.
  • To evaluate sensor performance using both direct and indirect immunoassay formats.

Main Methods:

  • Utilized a dual-channel, evanescent fluoroimmunoassay on a silicon oxynitride thin film optical waveguide.

Related Experiment Videos

  • Employed a red-emitting cyanine dye (Cy-5) to minimize optical interference.
  • Tested direct and indirect sandwich assay formats for protein ligand detection.

    • Main Results:

    • Achieved femtomolar (less than 1 part per trillion [w/w]) analyte detection limits.
    • Demonstrated dose-response behavior in both direct and indirect assay configurations.
    • Reported the first instance of femtomolar sensitivity in an immunosensing instrument.

    Conclusions:

    • The developed evanescent fluoroimmunoassay platform enables unprecedented sensitivity for analyte detection.
    • Integrated optical waveguides are highly effective for achieving ultra-low detection limits in biosensing.
    • This technology represents a significant advancement in immunosensing instrumentation.