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Related Experiment Videos

Dual-column immunoassays using protein G affinity chromatography.

L J Janis, F E Regnier

    Analytical Chemistry
    |September 1, 1989
    PubMed
    Summary

    This study introduces an automated on-line immunoassay system using tandem protein G affinity and reversed-phase chromatography (RPC) for antibody and antigen quantification. The novel method offers precise and reliable results for determining antibody titers and antigen levels in biological samples.

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    Area of Science:

    • Analytical Chemistry
    • Biochemistry
    • Immunology

    Background:

    • Immunoassays are crucial for detecting and quantifying antigens and antibodies.
    • Traditional immunoassay methods can be time-consuming and labor-intensive.
    • There is a need for automated, high-precision analytical techniques in immunological studies.

    Purpose of the Study:

    • To develop and validate an automated on-line immunoassay system.
    • To integrate protein G affinity chromatography with reversed-phase chromatography (RPC) for enhanced analysis.
    • To assess the precision and accuracy of the developed system for antibody and antigen quantification.

    Main Methods:

    • Utilized tandem protein G affinity and RPC columns with a switching valve for on-line immunoassays.

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  • Immobilized antibodies on a protein G column for reversible antigen capture.
  • Desorbed, dissociated, and transferred antigen-antibody complexes to the RPC column for separation and quantification.

    • Main Results:

    • Determined rabbit anti-human transferrin antibody titer with +/- 2% precision.
    • Quantified human transferrin in serum with +/- 6% precision, showing good agreement with rate nephelometry.
    • Established a linear dynamic range of 5 x 10(1) to 1 x 10(5) ng for transferrin antigen immunoassay with +/- 3.5% precision.

    Conclusions:

    • The developed on-line immunoassay system provides a precise and efficient method for antibody and antigen analysis.
    • The integration of affinity and RPC offers a robust platform for quantitative immunoassays.
    • This automated system demonstrates significant potential for clinical diagnostics and biochemical research.