Enzyme-linked immunosorbent assays in a chromatographic format

Area of Science:

• Biochemistry
• Analytical Chemistry
• Immunotechnology

Background:

• Enzyme-linked immunosorbent assays (ELISA) are widely used for detecting and quantifying substances.
• Traditional ELISA protocols can be time-consuming and labor-intensive.
• Automation is crucial for improving the throughput and reproducibility of immunoassays.

Purpose of the Study:

• To describe the development and execution of an automated ELISA system.
• To integrate high-pressure liquid chromatography (HPLC) pumps for precise fluid handling in ELISA.
• To enhance the efficiency and quantitation capabilities of ELISA.

Main Methods:

• Antibodies were immobilized on porous particles within immunosorbent columns.
• Valves and syringe pumps precisely metered samples and reagents.
• HPLC pumps transported samples, reagents, substrate, and wash buffers.
• Enzyme reaction product was detected using an absorbance detector.

Main Results:

• A modified ELISA protocol involved pre-complexing antigen with enzyme-conjugated antibody in an autosampler.
• The automated system efficiently captured the complex onto the immunosorbent.
• Subsequent substrate addition and product detection by absorbance allowed for quantitation.

Conclusions:

• The described automated ELISA system offers a robust platform for high-throughput immunoassay analysis.
• Integration of HPLC pumps and precise metering enhances assay performance and reproducibility.
• This approach facilitates efficient and accurate quantitation of analytes through automated ELISA execution.