Preparation of antibodies and development of a sensitive immunoassay with fluorescence detection for triazine herbicides

Sonia Herranz, Javier Ramón-Azcón, Elena Benito-Peña, María Dolores Marazuela, María Pilar Marco, María Cruz Moreno-Bondi

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    31 Citations (Scopus)

    Abstract

    Specific polyclonal antibodies against s-triazine herbicides were obtained by preparing immunogens coupling home-synthesized haptens derivatives of simazine (6-chloro-N-ethyl-N'-ethyl-1,3,5-triazine-2,4-diamine) to lysine groups of hemocyanin from keyhole limpets and bovine serum albumin carrier proteins. Three highly sensitive rabbit antisera were obtained and evaluated with a battery of six enzyme tracers derived from triazine structures in an optimized ELISA format. The antiserum As8 and the HRP-2f tracer, which yield the best assay sensitivity for simazine (detection limit 0.11∈±∈0.02 μg L-1, IC50 0.88∈±∈0.04 μg L -1), were applied to the development of a sensitive flow-through immunoassay for the analysis of this herbicide. The automated assay was based on a direct competitive immunosorbent assay and fluorescence detection. The optimized method presents an IC50 value of 0.35∈±∈0. 04 μg L-1 with a detection limit of 1.3∈±∈0.9 ng L-1 and a dynamic range from 0.010 to 7.5 μg L-1 simazine. The generic nature of the antiserum was shown by good relative cross-reactivities with other triazines such as atrazine (420%) or propazine (130%) and a lower response to terbutylazine (6.4%) and desethyl-atrazine (2.2%). No cross-reactivity was obtained for nonrelated pesticides such as 2,4-dichlorophenoxyacetic acid or linuron and the assay could be applied as a screening method for triazine herbicides. The total analysis time was 30 min per determination and the immunosensor could be reused for more than 150 cycles without significant loss of activity. The immunosensor has been successfully applied to the direct analysis of simazine in surface water samples at the nanogram per liter level. The results obtained by comparative analysis of the immunosensor with a chromatographic procedure for triazines showed a close correspondence.

    Original languageEnglish
    Pages (from-to)1801-1812
    Number of pages12
    JournalAnalytical and Bioanalytical Chemistry
    Volume391
    Issue number5
    DOIs
    Publication statusPublished - 2008 Jul 1

    Keywords

    • Anti-simazine polyclonal antibodies
    • Environmental analysis
    • Flow-through immunoassay
    • Surface waters
    • Triazines

    ASJC Scopus subject areas

    • Analytical Chemistry
    • Biochemistry

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  • Cite this

    Herranz, S., Ramón-Azcón, J., Benito-Peña, E., Marazuela, M. D., Marco, M. P., & Moreno-Bondi, M. C. (2008). Preparation of antibodies and development of a sensitive immunoassay with fluorescence detection for triazine herbicides. Analytical and Bioanalytical Chemistry, 391(5), 1801-1812. https://doi.org/10.1007/s00216-008-1895-1