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J Agric Food Chem. 2019 Jan 9;67(1):425-432. doi: 10.1021/acs.jafc.8b05290. Epub 2018 Dec 20.

Identification of Almond ( Prunus dulcis) Vicilin As a Food Allergen.

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Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering , China Agricultural University , No. 17 Qinghua Donglu, Haidian District , Beijing 100038 , P. R. China.
Agricultural Research Service, Pacific West Area, Western Regional Research Center , U. S. Department of Agriculture , 800 Buchanan Street , Albany , California 94710 , United States.
Division of Pediatric Immunology, Allergy, and Rheumatology, Department of Pediatrics , Stanford University School of Medicine , 269 Campus Drive , Stanford , California 94305 , United States.


Almond is one of the tree nuts listed by U.S. FDA as a food allergen source. A food allergen identified with patient sera has been debated to be the 2S albumin or the 7S vicilin. However, neither of these proteins has been defined as a food allergen. The purpose of this study was to clone, express, and purify almond vicilin and test whether it is a food allergen. Western blot experiment was performed with 18 individual sera from patients with double-blind, placebo-controlled clinical almond allergy. The results showed that 44% of the sera contained IgE antibodies that recognized the recombinant almond vicilin, indicating that it is an almond allergen. Identifying this and additional almond allergens will facilitate the understanding of the allergenicity of seed proteins in tree nuts and their cross-reactivity.


Pru du vicilin; food allergen; protein expression; storage protein

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