Competitive immunochromatographic assay for the detection of the organophosphorus pesticide EPN

Eun Hye Lee, Young Ah Kim, Yong Tae Lee, Bruce D. Hammock, Hye Sung Lee

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


An immunochromatographic assay (ICA) based on competitive antigen-coated format and colloidal gold label was developed for the detection of the organophosphorus insecticide O-ethyl O-4-nitrophenyl phenylphosphonothioate (EPN). The ICA test strip consisted of a membrane with a detection zone, a sample pad and an absorbent pad. The membrane was separately coated with EPN hapten-OVA conjugate (test line) and anti-mouse IgG (control line). As the competition is between the migrating analyte and the immobilised analyte hapten for the binding sites of the migrating antibody-colloidal gold (Ab-CG) conjugate, this study suggests that the relative migration speed between the two migrating substances is a critically important factor for the sensitive detection by competitive ICA. Based on this criterion, a nitrocellulose (NC) membrane was chosen as the most suitable for EPN ICA. The detection limit of the ICA for EPN standard and EPN spiked into agricultural samples were 10-2 and 5×10-2 μg mL-1, respectively.

Original languageEnglish (US)
Pages (from-to)129-138
Number of pages10
JournalFood and Agricultural Immunology
Issue number2
StatePublished - Jun 2013


  • EPN
  • immunoassay
  • immunochromatographic assay
  • organophosphorus pesticide

ASJC Scopus subject areas

  • Food Science
  • Immunology
  • Agronomy and Crop Science


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