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Issue 23, 2012
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Antibody generation and immunoassay development in diverse formats for pyrimethanil specific and sensitive analysis

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Abstract

Immunochemical techniques are complementary tools to modern analytical requirements. These methods rely on the production of immunoreagents with adequate binding properties. In the present study, a rationally designed and functionalized derivative of pyrimethanil – a modern anilinopyrimidine fungicide – was synthesized in order to generate for the first time high-affinity and selective antibodies to this xenobiotic. A single coupling procedure – based on hapten activation using N,N′-disuccinimidyl carbonate and purification of the active ester – was followed to prepare both immunizing and assay conjugates. Polyclonal antibodies were produced and characterized by enzyme-linked immunosorbent assay (ELISA) in four alternative formats: one indirect and three direct competitive procedures. The selected immunoassay displayed a limit of detection of 0.024 μg L−1, far lower than the official maximum residue limits and close to the sensitivity of regular instrumental assays. This ELISA was shown to be robust to buffer changes and tolerant to the presence of little amounts of methanol, ethanol and acetonitrile. Finally, the developed assay was applied to the analysis of pyrimethanil in carrot juice samples, and a limit of quantification of 0.040 mg L−1 was determined.

Graphical abstract: Antibody generation and immunoassay development in diverse formats for pyrimethanil specific and sensitive analysis

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Article information


Submitted
14 Jun 2012
Accepted
04 Oct 2012
First published
05 Oct 2012

Analyst, 2012,137, 5672-5679
Article type
Paper

Antibody generation and immunoassay development in diverse formats for pyrimethanil specific and sensitive analysis

J. V. Mercader, F. A. Esteve-Turrillas, C. Agulló, A. Abad-Somovilla and A. Abad-Fuentes, Analyst, 2012, 137, 5672
DOI: 10.1039/C2AN35801H

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