Development and validation of a rapid multiplex ELISA for pyrrolizidine alkaloids and their N-oxides in honey and feed

M. Oplatowska, C.T. Elliott, A.C. Huet, M. McCarthy, P.P.J. Mulder, C. von Holst, P. Delahaut, H.P. van Egmond, K. Campbell

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Abstract

Pyrrolizidine alkaloids (PAs) are a group of plant secondary metabolites with carcinogenic and hepatotoxic properties. When PA-producing plants contaminate crops, toxins can be transferred through the food chain and cause illness in humans and animals, most notably hepatic veno-occlusive disease. Honey has been identified as a direct risk of human exposure. The European Food Safety Authority has recently identified four groups of PAs that are of particular importance for food and feed: senecionine-type, lycopsamine-type, heliotrine-type and monocrotaline-type. Liquid or gas chromatography methods are currently used to detect PAs but there are no rapid screening assays available commercially. Therefore, the aim of this study was to develop a rapid multiplex ELISA test for the representatives of three groups of alkaloids (senecionine, lycopsamine and heliotrine types) that would be used as a risk-management tool for the screening of these toxic compounds in food and feed. The method was validated for honey and feed matrices and was demonstrated to have a detection capability less than 25 µg/kg for jacobine, lycopsamine, heliotrine and senecionine. The zinc reduction step introduced to the extraction procedure allows for the additional detection of the presence of N-oxides of PAs. This first multiplex immunoassay for PA detection with N-oxide reduction can be used for the simultaneous screening of 21 samples for >12 PA analytes. Honey samples (n¿=¿146) from various origins were analysed for PA determination. Six samples were determined to contain measurable PAs >25 µg/kg by ELISA which correlated to >10 µg/kg by LC-MS/MS.
Original languageEnglish
Pages (from-to)757-770
JournalAnalytical and Bioanalytical Chemistry
Volume406
Issue number3
DOIs
Publication statusPublished - 2014

Keywords

  • linked-immunosorbent-assay
  • dietary-supplements
  • enzyme-immunoassay
  • mass-spectrometry
  • plants
  • food
  • toxicity
  • invitro
  • pollen
  • system

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    Oplatowska, M., Elliott, C. T., Huet, A. C., McCarthy, M., Mulder, P. P. J., von Holst, C., Delahaut, P., van Egmond, H. P., & Campbell, K. (2014). Development and validation of a rapid multiplex ELISA for pyrrolizidine alkaloids and their N-oxides in honey and feed. Analytical and Bioanalytical Chemistry, 406(3), 757-770. https://doi.org/10.1007/s00216-013-7488-7