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Development of a highly sensitive biotin–streptavidin enzyme-linked immunosorbent assay for detecting diethyl phthalate based on a specific polyclonal antibody

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An indirect competitive biotin–streptavidin enzyme-linked immunosorbent assay (BA-ELISA) has been established for the determination of diethyl phthalate (DEP) in wine samples. A highly sensitive and specific polyclonal antibody (pAb-DEP) targeting DEP was prepared. Under optimized conditions, good linearity was achieved within a range of 0.021–9.512 μg·L−1. The limit of detection (IC10) was 0.0079 μg·L−1 and the median inhibitory concentration (IC50) was 0.443 μg·L−1. Besides, the BA-ELISA was highly selective, with low cross-reactivity values with DEP analogs (below 5%). Finally, the concentrations of DEP in wine samples ranged from 5.93 μg·L−1 to 59.15 μg·L−1 by BA-ELISA. Satisfactory recoveries (89.19–112.33%) and variation coefficient values (5.81–9.43%) were successfully obtained. The consistency between the results of BA-ELISA and gas chromatography–mass spectrometry (GC–MS) was 97.48%, which further confirmed that the proposed BA-ELISA immunoassay is reliable, rapid, sensitive, and accurate for monitoring DEP in wine samples.
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Keywords: biotin–streptavidin enzyme-linked immunosorbent assay (BA-ELISA); diethyl phthalate (DEP); polyclonal antibody (pAb-DEP); wine

Document Type: Research Article

Affiliations: School of Environment Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, P.R. China

Publication date: September 3, 2015

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