Development of a Gold Nanoparticle-Based ELISA for Detection of PCV2

Area of Science:

• Veterinary diagnostics
• Nanotechnology applications in biosensing
• Virology

Background:

• Porcine Circovirus type 2 (PCV2) is a significant swine pathogen.
• Conventional ELISA requires specialized plate reading equipment, limiting field applications.
• Need for rapid, cost-effective, and accessible diagnostic methods for PCV2.

Purpose of the Study:

• To develop a novel, equipment-free diagnostic method for PCV2 detection.
• To adapt the Enzyme-Linked Immunosorbent Assay (ELISA) using gold nanoparticles (AuNPs) for visual detection.
• To evaluate the efficiency and usability of the plasmonic ELISA (pELISA) for PCV2 diagnosis.

Main Methods:

• Utilized plasmonic ELISA (pELISA) by integrating gold nanoparticles (AuNPs) into a conventional ELISA format.
• Developed a colorimetric readout system for naked-eye identification of PCV2 presence.
• Tested pELISA with serum samples to detect PCV2, observing color changes (dark purple-gray for positive, red for negative).

Main Results:

• The pELISA method successfully detected PCV2 in serum samples without requiring plate reading equipment.
• A distinct color change was observed, enabling visual identification of positive (dark purple-gray) and negative (red) samples.
• The technique demonstrated high efficiency, detecting viral loads ≥ 5 log₁₀ copies/mL.

Conclusions:

• Plasmonic ELISA (pELISA) provides a user-friendly, cost-effective, and reliable method for PCV2 detection.
• This naked-eye assay eliminates the need for specialized equipment, enhancing accessibility for diagnostics.
• The pELISA methodology shows potential for adaptation to detect other pathogens.