title: Validation and comparison of a sandwich ELISA, two competitive ELISAs and a real-time PCR method for the detection of lupine in food.
abstract: Methods applied in food allergen analysis should be specific, sensitive and applicable to both raw and highly processed foods. The performance of the most commonly used methods, ELISA and real-time PCR, may, however, be influenced by food processing steps, e.g., heat treatment. The present study compares the applicability of four in-house developed methods, one sandwich ELISA, two competitive ELISAs and a real-time PCR method, for the detection of lupine in four different food matrices, comprising bread, biscuits, rice patties and noodles. In order to investigate the influence of food processing on the detectability, not only the heat treated model foods but also the corresponding doughs were analysed. The sandwich ELISA proved to be the most sensitive method. The LOD was found to be 10 ppm lupine, independent from the food matrix and independent if the dough or the heat treated food was analysed. In addition, the methods were applied to the analysis of commercial foodstuffs differing in their labelling.
authors.affiliation: Department of Analytical Chemistry, University of Vienna, Währinger Straße 38, 1090 Vienna, Austria.
authors.forename: Christina
authors.initials: C
authors.lastname: Ecker
authors.forename: Anna
authors.initials: A
authors.lastname: Ertl
authors.forename: Walter
authors.initials: W
authors.lastname: Pulverer
authors.forename: Albert
authors.initials: A
authors.lastname: Nemes
authors.forename: Pal
authors.initials: P
authors.lastname: Szekely
authors.forename: Angelika
authors.initials: A
authors.lastname: Petrasch
authors.forename: Gertrud
authors.initials: G
authors.lastname: Linsberger-Martin
authors.forename: Margit
authors.initials: M
authors.lastname: Cichna-Markl
mesh_terms: D052179:Antigens, Plant / Q000032:analysis* / Q000235:genetics; D001939:Bread / Q000032:analysis; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods*; D005504:Food Analysis / Q000379:methods*; D031297:Lupinus / Q000737:chemistry* / Q000235:genetics; D010940:Plant Proteins / Q000032:analysis* / Q000235:genetics; D060888:Real-Time Polymerase Chain Reaction / Q000379:methods*
chemical_list: D052179:Antigens, Plant; D010940:Plant Proteins