Real-time PCR Detection Methods for Food Allergens (Wheat, Buckwheat, and Peanuts) Using Reference Plasmids

Area of Science:

• Food Science
• Analytical Chemistry
• Molecular Biology

Background:

• Accurate detection of food allergens is crucial for consumer safety.
• Existing methods may lack sensitivity or specificity, leading to false results.
• Highly processed foods pose challenges for allergen detection.

Purpose of the Study:

• To develop specific and sensitive real-time qualitative polymerase chain reaction (PCR) methods for detecting wheat, buckwheat, and peanut allergens.
• To minimize instrument variability and avoid false-positive and false-negative results.
• To validate the method's performance in highly processed foods.

Main Methods:

• Real-time qualitative PCR assays were designed for target allergen DNA.
• Reference plasmids with known target sequences were used to set detection cutoffs in each run.
• The method was tested on various food materials and incurred samples, including highly processed foods.

Main Results:

• The developed real-time PCR methods demonstrated high specificity and sensitivity, detecting allergens at 10 ppm (w/w) protein levels.
• Reference plasmid analysis effectively minimized run-to-run and instrument variability, preventing false positives.
• The method successfully detected allergens in incurred samples where the official Japanese method failed, indicating improved sensitivity and avoidance of false negatives.

Conclusions:

• The developed real-time PCR method provides a reliable tool for detecting specific food allergens in processed foods.
• This approach enhances food safety by offering accurate detection and avoiding common sources of error.
• The method is suitable for confirming positive results from ELISA screening tests and ensuring compliance with allergen regulations.