title: Effects of extrusion, boiling, autoclaving, and microwave heating on lupine allergenicity.
abstract: Lupine flour has been reported as a causative agent of allergic reactions. However, the allergenicity of lupine after thermal processing is not well-known. For this purpose, the allergenic characteristics of lupine seeds after boiling (up to 60 min), autoclaving (121 degrees C, 1.18 atm, up to 20 min and 138 degrees C, 2.56 atm, up to 30 min), microwave heating (30 min), and extrusion cooking were studied. The IgE-binding capacity was analyzed by IgE-immunoblotting and CAP inhibition using a serum pool from 23 patients with lupine-specific IgE. Skin testing was carried out in four patients. An important reduction in allergenicity after autoclaving at 138 degrees C for 20 min was observed. IgE antibodies from two individual sera recognized bands at 23 and 29 kDa in autoclaved samples at 138 degrees C for 20 min. Autoclaving for 30 min abolished the IgE binding to these two components. A previously undetected band at 70 kDa was recognized by an individual serum. Therefore, prolonged autoclaving might have an important effect on the allergenicity of lupine with the majority of patients lacking IgE reactivity to these processed samples.
authors.affiliation: Servicio de Alergia, Hospital Universitario 12 de Octubre, Avenida de Córdoba s/n, 28041 Madrid, Spain, and SGIT-INIA, Ap. 8111, 2880 Madrid, Spain.
authors.forename: Javier
authors.initials: J
authors.lastname: Alvarez-Alvarez
authors.forename: Eva
authors.initials: E
authors.lastname: Guillamón
authors.forename: Jesús F
authors.initials: JF
authors.lastname: Crespo
authors.forename: Carmen
authors.initials: C
authors.lastname: Cuadrado
authors.forename: Carmen
authors.initials: C
authors.lastname: Burbano
authors.forename: Julia
authors.initials: J
authors.lastname: Rodríguez
authors.forename: Consuelo
authors.initials: C
authors.lastname: Fernández
authors.forename: Mercedes
authors.initials: M
authors.lastname: Muzquiz
mesh_terms: D000485:Allergens / Q000737:chemistry* / Q000276:immunology*; D005512:Food Hypersensitivity / Q000276:immunology; D006358:Hot Temperature; D006801:Humans; D007106:Immune Sera / Q000276:immunology; D015151:Immunoblotting; D007073:Immunoglobulin E / Q000097:blood / Q000276:immunology; D031297:Lupinus / Q000276:immunology*; D008872:Microwaves; D011312:Pressure; D012639:Seeds / Q000276:immunology; D012882:Skin Tests
chemical_list: D000485:Allergens; D007106:Immune Sera; D007073:Immunoglobulin E