title: Development and application of an enzyme-linked immunosorbent assay for the analysis of hydrolyzed fumonisins.
abstract: Polyclonal antibodies against hydrolyzed fumonisin B1 (HFB1) were prepared by immunization of rabbits with a keyhole limpet hemocyanin conjugate coupled by glutaraldehyde. Sensitivity and specificity of these antibodies were tested in a direct competitive enzyme-linked immunosorbent assay (ELISA), in which a HFB1-horseradish peroxidase conjugate prepared by reductive alkylation served as the labeled antigen. A direct competitive ELISA for the quantitative determination of HFB1 in corn-based food samples was developed with this antibody. The 50% inhibition level was used for the determination of cross-reactivity. The cross-reactivities of the antibodies for HFB2 and HFB3 were 4.3% and 14.4%, respectively, whereas the parent compound fumonisin B1 (FB1) showed no cross reactivity. The detection limit of the EIA calculated from the HFB1-concentration given a 30% binding inhibition was 0.25 ng/ml for the standard solutions and 10 ng/g for the analyzed food samples e.g. tortilla chips, nachos and cornflakes. Mean recoveries of HFB1 for artificially contaminated food samples were in the range of 96 to 98%. This test offers a rapid and economic opportunity for the HFB1-screening of food samples.
authors.affiliation: Veterinary Faculty, University of Munich, Veterinärstrasse 13, D-80539, Munich, Germany.
authors.forename: I
authors.initials: I
authors.lastname: Zimmer
authors.forename: R
authors.initials: R
authors.lastname: Dietrich
authors.forename: E
authors.initials: E
authors.lastname: Usleber
authors.forename: E
authors.initials: E
authors.lastname: Märtlbauer
authors.forename: E
authors.initials: E
authors.lastname: Schneider