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Distinction of Signals Generated by Allergens from Cross-Reactivity in Botanicals Used in Dietary Supplements and Spices Using the xMAP Food Allergen Detection Assay.

The xMAP Food Allergen Detection Assay (xMAP FADA) is a powerful analytical method by virtue of its ability to simultaneously detect multiple antigenic elements with a repertoire of antibodies targeting 15 food allergens plus gluten. Further, by incorporating multiple levels of redundancy, it can also be used to distinguish between homologous cross-reactive analytes. The power of its analytical capabilities is especially critical when working with botanicals. In this research, 95 botanicals used in dietary supplements and spices were analyzed for cross-reactivity with common food allergens and gluten using the xMAP FADA. Complementary antibody ratios were calculated, and, with most samples, ratios generated by homologous cross-reactive epitopes were easily distinguished from true reactivity. In very few cases, sample ratios were comparable to the ratios generated by the calibration standards, indicating the probable detection of relatively minor quantities of target food allergen. With the xMAP FADA, distinguishing signal indicating target allergen detection from cross-reactivity in botanicals is possible using redundant antibodies and multiple confirmatory end points.