Gold-based nanoplatform for a rapid lateral flow immunochromatographic test assay for gluten detection

Area of Science:

• Food Science and Technology
• Analytical Chemistry
• Immunology

Background:

• Gluten, found in wheat, rye, and barley, is a common food allergen causing celiac disease by damaging the small intestine.
• Accurate detection of gluten in raw materials is crucial for food safety and allergen management.
• Existing methods may not be sufficiently rapid or accessible for real-time screening.

Purpose of the Study:

• To design and validate a rapid immunochromatographic lateral flow test assay (LFTS) for detecting gluten content in raw food materials.
• To screen for gliadin, the toxic component of gluten, using a specific antibody-based detection system.
• To establish the sensitivity, specificity, and usability of the developed LFTS for food analysis.

Main Methods:

• Synthesis and conjugation of gold nanoparticles (AuNPs) with gliadin monoclonal antibodies.
• Immobilization of one gliadin monoclonal antibody on a membrane as a capture reagent in the test zone.
• Utilizing the AuNP-labeled gliadin monoclonal antibody as a detector reagent for gliadin detection.

Main Results:

• Successfully synthesized and conjugated 20 nm gold nanoparticles with gliadin monoclonal antibodies.
• The developed LFTS demonstrated a detection limit of 20 ppm for gliadin.
• Positive results were visualized within 15 minutes using only 40 μL of extracted sample, showing high sensitivity and specificity across various flour samples.

Conclusions:

• The developed lateral flow test strip (LFTS) provides an easy-to-use and rapid method for screening gluten levels in raw materials.
• The LFTS exhibits promising performance for reliable gluten detection.
• This assay can be a valuable tool for ensuring the safety of food products by monitoring gluten content.