Abstract
Food allergies affect some 15 million Americans. The only treatment for food allergies is a strict avoidance diet. To help ensure the reliability of food labels, analytical methods are employed; the most common being enzyme-linked immunosorbent assays (ELISAs). However, the commonly employed ELISAs are single analyte-specific and cannot distinguish between false positives due to cross-reactive homologous proteins; making the method of questionable utility for regulatory purposes when analyzing for unknown or multiple food allergens. Also, should the need arise to detect additional analytes, extensive research must be undertaken to develop new ELISAs. To address these and other limitations, a multiplex immunoassay, the xMAP® food allergen detection assay (xMAP FADA), was developed using 30 different antibodies against 14 different food allergens plus gluten. Besides incorporating two antibodies for the detection of most analytes, the xMAP FADA also relies on two different extraction protocols; providing multiple confirmatory end-points. Using the xMAP FADA, the cross-reactivities of 45 botanicals used in dietary supplements and spices commercially sold in the USA were assessed. Only a few displayed cross-reactivities with the antibodies in the xMAP FADA at levels exceeding 0.0001%. The utility of the xMAP FADA was exemplified by its ability to detect and distinguish between betel nut, saw palmetto, and acai which are in the same family as coconut. Other botanicals examined included allspice, amchur, anise seed, black pepper, caraway seed, cardamom, cayenne red pepper, sesame seed, poppy seed, white pepper, and wheat grass. The combination of direct antibody detection, multi-antibody profiling, high sensitivity, and a modular design made it possible for the xMAP FADA to distinguish between homologous antigens, provide multiple levels of built-in confirmatory analysis, and optimize the bead set cocktail to address specific needs.
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Acknowledgements
R.O. Pedersen, Ph.D. was supported in part by an FDA Commissioner’s Fellowship. Our gratitude is expressed to Masahiro Shoji, Ph.D. (Morinaga Institute of Biological Sciences, Inc.); Mansour Samadpour, Ph.D. (IEH Laboratories and Consulting Group); Thomas Grace and John Leslie (BiaDiagnostics, LLC; Elution Technologies—3M Food Safety) for their openness and willingness to make resources available for the xMAP FADA. Gratitude is also expressed to Shaun MacMahon, Ph.D.; George C. Ziobro, Ph.D.; Rakhi Panda, Ph.D.; Prasad Rallabhandi, Ph.D.; and Lynn L.B. Rust Ph.D. (NIH) for valuable discussions.
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Pedersen, R.O., Nowatzke, W.L., Cho, C.Y. et al. Cross-reactivity by botanicals used in dietary supplements and spices using the multiplex xMAP food allergen detection assay (xMAP FADA). Anal Bioanal Chem 410, 5791–5806 (2018). https://doi.org/10.1007/s00216-018-1187-3
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DOI: https://doi.org/10.1007/s00216-018-1187-3