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Characterization of Allergens in Mango Fruit and Ripening Dependence of the Allergenic Potency

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The topic of the present paper is the detection of IgE-related allergens in mango fruit. Furthermore the occurrence of allergens during ripening of mango fruit is investigated. In order to identify the molecular weights of IgE-binding allergens SDS-PAGE/immunoblotting was performed. Fifty-two sera from patients with IgE-mediated sensitization to mango fruit were used. Forty-six of the 52 patient sera detected two allergens with molecular weights of approximately 40 and 30 kDa. These can be described as the so-called major allergens. Other IgE-binding patterns were detected for fewer than 50% of the assigned sera. By 2D-electrophoresis it could be proved that the major allergen with a molecular weight of approximately 40 kDa exists as an isoallergen with isoelectric points of 4.6 and 4.8. The allergen with a molecular weight of approximately 30 kDa had an isoelectric point of 4.9. According to international rules, the 40 kDa allergen was named Mangifera indica 1 (Man i 1) and the 30 kDa allergen , Mangifera indica 2 (Man i 2). By means of SDS-PAGE/ immunoblotting, immunoblot inhibition and EAST-inhibition it could be shown that there is no significant difference in the allergenic potency during fruit ripening.
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Keywords: ALLERGY; CHARACTERIZATION; D-ELECTROPHORESIS; EAST-INHIBITION; IMMUNOBLOT; MANGO; RIPENING; SDS-PAGE

Document Type: Research Article

Affiliations: 1: University of Hamburg, Institute of Biochemistry and Food Chemistry, Hamburg, Germany 2: University Hospital Hamburg-Eppendorf, Department of Dermatology and Allergy, Hamburg, Germany 3: Special Clinic Borkum, Borkum, Germany

Publication date: March 1, 2001

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