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[B/F separation systems in enzyme immunoassay]

¹Department of Laboratory Medicine, Hokkaido University School of Medicine.

Nihon Rinsho. Japanese Journal of Clinical Medicine

|September 1, 1995

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This review explores enzyme immunoassay separation techniques, highlighting solid-phase methods and novel approaches like magnetic particles and avidin-biotin systems for improved efficiency and sensitivity in diagnostics.

Area of Science:

Immunochemistry
Biotechnology
Analytical Chemistry

Context:

Enzyme immunoassays (EIAs) are crucial diagnostic tools.
Effective separation of bound/free (B/F) analytes is essential for EIA accuracy.
Traditional methods face limitations in speed, convenience, and sensitivity.

Purpose:

To review and compare various bound/free (B/F) separation methods in enzyme immunoassays.
To discuss the advantages and disadvantages of different solid-phase and liquid-phase techniques.
To highlight emerging technologies enhancing EIA performance.

Summary:

Liquid-phase EIAs often use double antibody methods, suitable for smaller labs.
Solid-phase EIAs, utilizing physical adsorption or covalent binding to supports, are more popular due to convenience and ease of B/F separation via washing.

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Advanced methods include avidin-biotin systems, immune complex transfer, magnetic particles for accelerated complex formation, and rapid sandwich EIAs on porous filters for dry chemistry applications.

Impact:

Solid-phase and advanced EIA separation techniques improve assay sensitivity, speed, and convenience.
Magnetic particles and avidin-biotin systems offer enhanced performance for clinical diagnostics.
Innovations in EIA separation contribute to more efficient and accessible diagnostic testing.