Isobutyl cyanoacrylate nanoparticles as a solid phase for an efficient immunoradiometric assay

Area of Science:

• Biomaterials Science
• Immunotechnology
• Nanotechnology

Background:

• Development of nanoparticle-based assays requires understanding protein interactions.
• Cyanoacrylic nanoparticles offer potential for bioconjugation.

Purpose of the Study:

• To investigate the binding characteristics of monoclonal antibodies and serum proteins to cyanoacrylic nanoparticles.
• To evaluate the stability and immunoreactivity of antibody-coated nanoparticles.
• To develop a novel assay for alpha-fetoprotein (AFP) detection.

Main Methods:

• Coating of cyanoacrylic nanoparticles with monoclonal antibodies and serum proteins.
• Characterization of adsorption kinetics and binding capacity.
• Assessment of linkage stability and retained immunoreactivity.
• Development and validation of a competitive immunoradiometric assay.

Main Results:

• High binding capacity and rapid adsorption kinetics observed for proteins and antibodies.
• Stable linkage formed between nanoparticles and biomolecules.
• Immunoreactivity of antibodies was preserved after nanoparticle conjugation.
• The developed assay detected alpha-fetoprotein down to 0.1 ng per assay.

Conclusions:

• Cyanoacrylic nanoparticles are suitable for antibody and protein immobilization.
• Nanoparticle-based assays can maintain biological activity.
• A sensitive immunoradiometric assay for AFP has been developed using these nanoparticles.