Enhancing commercially available immunoassays through a customized electrokinetic biomolecular preconcentration...

Area of Science:

• Biomedical Engineering
• Analytical Chemistry
• Nanotechnology

Background:

• Immunoassays are vital for diagnostics but often lack sensitivity.
• Current limitations hinder their use in resource-limited settings.
• Enhancing immunoassay sensitivity is crucial for early disease detection.

Purpose of the Study:

• To develop an electrokinetic preconcentration device for biomolecules.
• To improve the sensitivity of commercially available immunoassays.
• To enable point-of-care (POC) diagnostics without assay modification.

Main Methods:

• Utilized ion concentration-polarization in micro/nanofluidics for biomolecule capture.
• Integrated a preconcentration step with standard immunoassays (ELISA, LFA).
• Developed a pump-free, cost-effective device for ease of use.

Main Results:

• Achieved an order of magnitude improvement in the limit of detection for immunoassays.
• Demonstrated signal enhancement correlated with sample volume and operational time.
• Validated the device's effectiveness for ELISA and LFA.

Conclusions:

• The electrokinetic device effectively preconcentrates biomolecules, enhancing immunoassay sensitivity.
• This technology offers a pathway to improved biomedical POC diagnostics.
• The system is compatible with existing immunoassays, requiring no modifications.