Colorimetric multiplexed immunoassay using specific aggregation of antigenic peptide-modified luminous nanoparticles

Area of Science:

• Biotechnology
• Nanotechnology
• Immunology

Background:

• Multiplexed immunoassays are crucial for simultaneous detection of multiple analytes.
• Current methods can be complex and time-consuming.
• Development of rapid, single-step multiplexed assays is needed.

Purpose of the Study:

• To develop a rapid, one-step multiplexed immunoassay for simultaneous antibody detection.
• To utilize luminous nanospheres for distinct signal generation.
• To enable differentiation of multiple antibodies in a single reaction vessel.

Main Methods:

• Immobilization of antigenic peptides (FAK, c-Myc, alpha-catenin) onto 40 nm luminous nanospheres.
• Functionalization of nanospheres with cationic or anionic pentamer tails.
• Mixing of antibody samples with differentially color-coded nanospheres.
• Observation of aggregate formation and emission color for antibody identification.

Main Results:

• Successful immobilization of peptides onto nanospheres.
• Distinct red and green emissions for FAK/c-Myc and c-Myc/alpha-catenin peptide-conjugated spheres, respectively.
• Formation of antibody-specific aggregates with distinct colors (red, green, yellow) upon mixing.
• Demonstration of multiplexed detection of anti-FAK, anti-c-Myc, and anti-alpha-catenin antibodies in one step.

Conclusions:

• The developed nanosphere-based immunoassay allows for rapid, one-step multiplexed detection of antibodies.
• Aggregate color differentiation provides a simple mechanism for identifying multiple targets simultaneously.
• This system offers a promising platform for advanced diagnostic applications.