A plasmonic nanosensor for immunoassay via enzyme-triggered click chemistry

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Analytical Chemistry

Background:

• Conventional plasmonic immunoassays often require enzyme conjugation, limiting compatibility with existing platforms.
• There is a need for sensitive, stable, and broadly applicable immunoassay technologies.

Purpose of the Study:

• To develop a plasmonic nanosensor compatible with conventional immunoassay platforms.
• To enhance the sensitivity and stability of immunoassays using nanoparticle-based detection.
• To utilize enzyme-triggered click chemistry for a simplified readout mechanism.

Main Methods:

• Development of a plasmonic nanosensor using gold nanoparticles functionalized with azide and alkyne groups.
• Utilizing alkaline phosphatase (ALP) to trigger click chemistry between functionalized gold nanoparticles.
• Employing the plasmonic signal generated from nanoparticle aggregation as the assay readout.

Main Results:

• The developed plasmonic nanosensor is compatible with conventional immunoassay platforms.
• The sensor demonstrates significantly improved sensitivity and stability compared to existing methods.
• The alkaline phosphatase-triggered click chemistry provides a straightforward and effective readout.

Conclusions:

• This plasmonic nanosensor offers a simplified and highly sensitive detection method for immunoassays.
• The technology broadens the applicability of nanoparticle-based immunoassays.
• The approach holds significant potential for diagnostic applications in resource-constrained environments.