Food allergen management is an increasingly important economic and public health concern; therefore, accurate and reliable allergen measurements are a crucial component of the management pathway. Traditional methods for food allergen detection are based on immunoassay techniques and are linked to a specific commodity (e.g., total milk protein, total egg protein). However, the emergence of mass spectrometry-based platforms has revealed the need for reference materials that support protein-specific measurements. To support the harmonization of food allergen measurements, the new food allergen research effort at NIST is focused on providing reference materials and methods to improve the connection between the measured protein food allergen and the reported total commodity value.
Current food allergen reference materials include a value for total commodity as determined by non-specific approaches, such as total nitrogen measurement, and contain no direct link between the measured food allergen protein(s) and the reported total commodity value. Approximately 18 NIST food reference materials are available that include a reference value for total protein as determined by conversion from a total nitrogen measurement, which potentially could be used to support food allergen measurements. Consequently, claims of traceability for measurement of a specific protein allergen, such as measurements determined by mass spectrometry, to the results of a total nitrogen measurement are invalid. Therefore, adding values for the mass concentrations of specific protein food allergens or their surrogates in existing NIST food reference materials will improve the degree of measurement traceability and provide tools for the user community to validate food protein allergen measurements.
Current and Upcoming Activities
I. SCIENTIFIC WORKSHOPS
i. October 28-31, 2019; Gaithersburg, MD
ii. Food Allergen Technical Session: Tuesday, October 29, 2019
b. AOAC 2019 Annual Meeting Scientific Session
i. Community Perspectives of Food Allergen Measurement (Wednesday, September 11, 2019)
II. INTERLABORATORY ASSESSMENT OF MILK ALLERGEN PROTEIN
Purpose: In an effort to identify measurement needs and guide the development of reference materials, NIST is organizing interlaboratory studies to assess measurement equivalence of milk proteins across multiple platforms for simple and complex food samples. The interlaboratory study will consist of two phases: Phase I involves the assessment of non-challenging protein samples and Phase II will incorporate more complex samples and candidate reference materials.
a. Phase I Study (fall of 2019)
i. Goal: Assess measurement equivalence (measured values and reporting units) of milk proteins across multiple platforms (ELISA and mass spectrometry) for non-challenging samples.
ii. To participate in the Phase I Study, please email: email@example.com
- Phinney, K., Beasley-Green, A., Bunk, D., Phillips, M., O’Connor, G., Martinez-Esteso, M., Scholl, P., Ogura, T. “Challenges of Mass Spectrometry-based Methods for Protein Food Allergens”. 15th International Symposium on Biological and Environmental Reference Materials (BERM-15) Annual Conference, Berlin; September 2018 (Poster Presentation).
- Beasley-Green, A., Bunk, D., Phillips, M., O’Connor, G., Martinez-Esteso, M., Scholl, P., Ogura, T. “Challenges of Mass Spectrometry-based Methods for Protein Food Allergens”. AOAC International Annual Conference, Toronto, CA; August 2018 (Poster Presentation).
- Bunk, D., Beasley-Green, A., Phillips, M., Ogura, T., “Developing Reference Materials for Protein Allergens in Food”. AOAC International Annual Conference, Toronto, CA; August 2018 (Poster Presentation).
- Tran, W., Adom, M.A., Beasley-Green, A., Phillips, M., Bunk, D. “An Interlaboratory Study to Evaluate the Equivalence of Milk Protein Allergen Measurement”. AOAC International Annual Conference, Denver, CO; September 2019 (Poster Presentation ).
- Phillips, M.M., Bunk, D.M., Beasley-Green, A. (2018). “Mid-Year Meeting Special Event: NIST Workshop on Measurement Challenges of the MS-Based Determination of Food Allergens.” Inside Laboratory Management, AOAC International. Jan/Feb 2018 Issue 4.