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Related Experiment Videos

Mass-sensing, multianalyte microarray immunoassay with imaging detection

J W Silzel1, B Cercek, C Dodson

  • 1Beckman Coulter, Inc., Brea, CA 92822-8000, USA. jsilzel@beckman.com

Clinical Chemistry
|September 11, 1998
PubMed
Summary
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Miniaturized ligand binding assays can detect low molecule counts by harvesting analytes, offering high sensitivity and specificity while significantly reducing reagent use compared to traditional methods.

Area of Science:

  • Biochemistry
  • Analytical Chemistry
  • Assay Development

Background:

  • Miniaturization of ligand binding assays can reduce costs through decreased reagent consumption.
  • The potential for miniaturized assays to enhance sensitivity by exploiting total analyte mass (analyte harvesting) is less understood.
  • Macroscopic techniques often require larger sample volumes and higher reagent quantities.

Purpose of the Study:

  • To demonstrate that miniaturized ligand binding assays can achieve high sensitivity through analyte harvesting.
  • To develop a method for sensing total analyte mass rather than concentration.
  • To compare the performance of miniaturized assays with traditional methods like ELISA.

Main Methods:

  • Immobilizing capture reagents (avidin or antibodies) in 200-microm diameter zones.

Related Experiment Videos

  • Incubating zones with liquid samples for 1-3 hours to deplete analyte.
  • Utilizing fluorescence imaging in situ with a near-infrared dye label for detection.
  • Developing single and multianalyte mass-sensing sandwich array assays for IgG subclasses.

    • Main Results:

    • Capture reagents in miniaturized zones substantially depleted analyte from samples.
    • Assays successfully sensed total analyte mass, not just concentration.
    • Detection of as few as 10^5 molecules of analyte per zone was achieved.
    • Mass-sensing sandwich array assays demonstrated ELISA-like sensitivity and specificity.
    • These assays used less than 1/100 of the capture antibody required by 96-well plate formats.

    Conclusions:

    • Miniaturized ligand binding assays can achieve superior sensitivity by harvesting total analyte mass.
    • The developed method enables precise mass-sensing, offering an advantage over concentration-based measurements.
    • This approach significantly reduces reagent consumption while maintaining high assay performance.
    • The technology holds promise for cost-effective and highly sensitive bioanalytical applications.