There are 2 allergens involved in allergy to brazil nuts.
Ber e 1 is a 2S seed storage albumin protein and Ber e 2 is a 11S globulin seed storage protein. Seed storage proteins are found in all nuts, causing people to be allergic to whole groups of tree nuts.
Brazil Nut allergy is not currently associated with any allergic syndromes.
Other food containing 2S albumin seed storage proteins are cashews, peanuts, almonds, mustard seed, rapeseed, turnip, chickpeas, hazelnuts, pistachio, buckwheat, soya beans, sunflower seeds, walnuts, kiwi, castor beans and sesame seeds.
There is a lot of cross reactivity between 2S and 11S seed storage proteins, the only other food containing 11S proteins not mentioned above is pumpkin.
What Are the Symptoms of a Nut Allergy?
Allergy UK - Quick Guide to Tree Nut Allergy
Anaphylaxis Campaign - Peanut and Tree nut allergies
Can You Be Allergic to Just One Type of Tree Nut?
Anaphylaxis Campaign - Brazil Nuts
Allergy information for: Brazil nut (Bertholletia excelsa )
Current perspectives on tree nut allergy: a review, 2018
2S Albumin Storage Proteins: What Makes them Food Allergens?, 2008
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