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Immunochemistry at interfaces.

H Nygren1, M Stenberg

  • 1Department of Histology, University of Göteborg.

Immunology
|March 1, 1989
PubMed
Summary
This summary is machine-generated.

Antibody binding to immobilized antigens is slower than in solution, often limited by diffusion. This study explores factors affecting antigen-antibody reactions at solid-liquid interfaces, revealing slow dissociation and irreversible complexes.

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Area of Science:

  • Immunochemistry
  • Biophysical Chemistry
  • Surface Science

Background:

  • Antibody-antigen interactions are crucial in diagnostics and therapeutics.
  • Understanding solid-phase reactions is key to optimizing immunoassays.
  • Previous models often overlook interface-specific kinetic limitations.

Purpose of the Study:

  • To review immunochemistry of antibody binding to immobilized antigens.
  • To compare experimental data with theoretical models of solid-liquid interface reactions.
  • To elucidate factors influencing reaction rates and complex stability.

Main Methods:

  • Review of experimental data on antibody-antigen binding kinetics.
  • Comparison with theoretical models of interfacial reaction mechanisms.

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  • Analysis of factors affecting reaction rates (diffusion, surface concentration).

    • Main Results:

    • Solid-phase reactions can be diffusion-limited due to reactant depletion.
    • Forward reaction rates decrease with increasing bound antibody concentration.
    • Surface-bound antibody reactions are significantly slower ( >1000-fold) than in solution.
    • Dissociation of bound antibodies is slow, forming nearly irreversible complexes.
    • Lateral interactions between bound antibodies may enhance complex stability.

    Conclusions:

    • Interfacial kinetics differ significantly from solution-phase kinetics.
    • Diffusion and surface antibody concentration are critical factors in solid-phase immunoassays.
    • Antigen-antibody complexes formed on solid phases exhibit high stability, potentially due to inter-antibody interactions.