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Related Experiment Videos

A silicon sensor-based filtration immunoassay using biotin-mediated capture.

J D Olson1, P R Panfili, R Armenta

  • 1Molecular Devices Corporation, Menlo Park, CA 94025.

Journal of Immunological Methods
|November 6, 1990
PubMed
Summary

A novel sandwich immunoassay efficiently detects human chorionic gonadotropin (hCG) using biotin filtration and silicon sensor technology. This sensitive method offers rapid, accurate results for hCG detection.

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Area of Science:

  • Biomedical Engineering
  • Analytical Chemistry
  • Immunotechnology

Background:

  • Accurate detection of human chorionic gonadotropin (hCG) is crucial for pregnancy testing and monitoring.
  • Existing immunoassay methods may face limitations in sensitivity, speed, or sample volume requirements.

Purpose of the Study:

  • To develop a highly sensitive sandwich immunoassay for human chorionic gonadotropin (hCG).
  • To utilize biotin-mediated filtration capture and silicon sensor detection for enhanced assay performance.

Main Methods:

  • A sandwich immunoassay was designed incorporating biotin-mediated filtration for efficient capture of analyte-streptavidin complexes.
  • A light-addressable potentiometric sensor (LAPS) was employed for detecting urease-antibody conjugates, leveraging its pH-sensing capabilities.

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  • A specialized LAPS reader was developed to analyze small sample volumes (approx. 1 microliter).

    • Main Results:

    • The assay demonstrated efficient capture of complexes, unaffected by variations in filtration flow rates or biotin concentrations.
    • Detection of hCG was achieved within 20 minutes, with a sensitivity of 10 pg.
    • The developed assay showed a four standard deviation separation from background noise, indicating high specificity.

    Conclusions:

    • The developed biotin-mediated filtration capture and LAPS detection assay provides a sensitive and rapid method for human chorionic gonadotropin (hCG) quantification.
    • This approach offers advantages in terms of detection volume and assay time compared to traditional methods like radioimmunoassay (RIA).
    • The technology holds potential for improved diagnostic tools in reproductive health and other applications requiring sensitive biomarker detection.