Magnetic Nanozyme-Linked Immunosorbent Assay for Ultrasensitive Influenza A Virus Detection

Area of Science:

• Biotechnology
• Nanotechnology
• Analytical Chemistry

Background:

• Rapid and sensitive influenza virus detection is crucial for infection control and timely clinical treatment.
• Existing diagnostic methods may lack the sensitivity or speed required for effective public health interventions.
• Development of novel diagnostic platforms is essential to combat the spread of influenza.

Purpose of the Study:

• To develop an ultrasensitive colorimetric assay for detecting influenza A virus.
• To combine magnetic nanobeads and gold nanozymes for enhanced detection capabilities.
• To establish a robust sensing platform with improved sample separation and signal amplification.

Main Methods:

• Development of a magnetic nano(e)zyme-linked immunosorbent assay (MagLISA) using silica-shelled magnetic nanobeads (MagNBs) and gold nanoparticles (AuNZs).
• Utilizing MagNBs for facile target separation and AuNZs for signal amplification through their enzyme-like activity.
• Experimental and computational evaluation of AuNZ enzymelike activity and performance in detecting influenza A virus (H1N1).

Main Results:

• The MagLISA demonstrated a broad linear detection range for influenza A virus from 5.0 × 10^-15 to 5.0 × 10^-6 g·mL^-1.
• Achieved a detection limit as low as 5.0 × 10^-12 g·mL^-1 visually and 44.2 × 10^-15 g·mL^-1 with a microplate reader.
• Successfully detected clinically isolated influenza A virus in human serum samples at a detection limit of 2.6 PFU·mL^-1.

Conclusions:

• The novel MagLISA platform provides ultrasensitive, rapid, and reliable detection of influenza A virus.
• The assay combines efficient sample separation, enrichment, and signal amplification for superior performance.
• This technology has the potential to significantly reduce influenza spread and improve clinical treatment outcomes.