Simultaneous analysis of 12 food allergens in baked and raw food products using the LC-MS/MS QTRAP® 4500 system

Importance of the Topic

Food allergies represent a growing public health concern, affecting over 150 million individuals worldwide. Even trace amounts of allergenic proteins in food products can trigger severe reactions, including anaphylaxis. Robust analytical methods are essential to ensure accurate labeling, protect consumers, and comply with international food safety standards.

Objectives and Study Overview

This study aimed to develop and validate a multiplexed LC-MS/MS workflow capable of simultaneously detecting 12 priority food allergens in both raw and baked matrices. The target proteins were selected according to Codex Alimentarius guidelines, covering eggs, milk, peanuts, soy, and tree nuts.

Methodology and Instrumentation

Sample preparation involved defatting and enzymatic digestion of homogenized food samples, followed by tryptic peptide generation.

• Chromatographic separation: Shimadzu Prominence UFLCXR with a Phenomenex Kinetex C18 column (100 × 3 mm, 2.6 µm).
• Mass spectrometry platforms: SCIEX TripleTOF 6600 for signature peptide discovery; QTRAP 4500 with Turbo V source for Scheduled MRM™ detection.
• Data acquisition: Scheduled MRM™ algorithm enabled monitoring of 88 transitions corresponding to 44 unique allergenic peptides in a single 12-minute run.

Main Results and Discussion

The method achieved linear response (R² > 0.95) over 0–500 ppm for all allergens and reached detection limits of 10 ppm in bread and cookie matrices. Comparative analysis with commercial ELISA kits for hazelnut and peanut showed strong correlation (r ≥ 0.99) but revealed that ELISA often underestimates allergen content at higher concentrations. Analysis of commercial bakery products confirmed the method’s ability to identify declared and undeclared allergens accurately.

Benefits and Practical Applications

This LC-MS/MS approach offers several advantages over traditional ELISA assays:

• Simultaneous detection of multiple allergens in a single injection.
• High specificity by monitoring multiple unique peptides per protein.
• Reduced false positives and negatives through multiplexed MRM transitions.

It is well suited for food safety laboratories, quality control, and regulatory compliance testing.

Future Trends and Potential Applications

Advancements may include expanding the panel to additional allergens, incorporating isotopically labeled internal standards for quantitation, and coupling to high-throughput sample preparation. Integration with automated data analysis pipelines and cloud-based reporting can further enhance throughput and traceability in routine testing.

Conclusion

A comprehensive LC-MS/MS method has been established for the simultaneous screening of 12 major food allergens in complex matrices. The multiplexed Scheduled MRM™ workflow delivers high sensitivity, specificity, and throughput, making it a powerful tool for safeguarding allergic consumers and supporting global food labeling regulations.

References

• R. Valenta et al. Food allergies: the basics. Gastroenterology 148 (2015) 1120–1131.
• A. Sage. Food Allergen Analysis Using LC-MS-MS. LCGC The Column 10 (2015) 13–29.
• Codex Alimentarius Commission. Report of the Twenty-Second Session of the Codex Committee on Food Labelling (1993).
• S. Lock et al. The Detection of Allergens in Bread and Pasta by Liquid Chromatography Tandem Mass Spectrometry. SCIEX Application Note (2010) #1830610-0.