Application of a monoclonal-based immunoassay for the determination of imazalil in fruit juices |
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Authors: | María-José Moreno Emma Plana Angel Montoya Pasquale Caputo Juan J Manclús |
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Affiliation: | Instituto de Investigación e Innovación en Bioingeniería, Universidad Politécnica de Valencia, Camino de Veras/n, Edificio 7F, 5a planta, 46022 Valencia, Spain. |
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Abstract: | A monoclonal antibody-based enzyme-linked immunosorbent assay (ELISA) was developed for the quantification of imazalil (RS)-1-(β-allyloxy-2,4-dichlorophenylethyl)imidazole] in apple, tomato and orange juice samples. From an imazalil hapten, which mimics the analyte structure, several monoclonal antibodies were obtained. An ELISA in the conjugate-coated format was developed and optimized using the antibody showing the highest sensitivity. For standards, the detection limit of the ELISA was 0.2?nM (0.06?ng?ml-1), with an I50 value of 1.6?nM (0.5?ng?ml-1). The study of the influence of matrices on assay reliability indicated that the ELISA could determine imazalil in fruit juices at the low ng?ml-1 level simply by diluting the sample, without any clean-up or concentration step. Recovery and precision of the method were evaluated by spiking juice samples with imazalil in the 10-500?ng?ml-1 range. The mean recovery from fruit juices was 97% and the mean coefficient of variation was ~20%. In addition to being precise and accurate, the method has proved to be simple and sensitive, with a quantification limit well below the maximum residue limits for imazalil in these matrices. |
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Keywords: | Imazalil azole fungicide monoclonal antibodies immunoassay ELISA fruit juices |
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