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LC-MS/MS method for the determination of organophosphorus pesticides and their metabolites in salmon and zebrafish fed with plant-based feed ingredients

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Abstract

The composition of Atlantic salmon feed has changed considerably over the last two decades from being marine-based (fishmeal and fish oil) to mainly containing plant ingredients. Consequently, concern related to traditional persistent contaminants typically associated with fish-based feed has been replaced by other potential contaminants not previously associated with salmon farming. This is the case for many pesticides, which are used worldwide to increase food production, and may be present in plant ingredients. Earlier studies have identified two organophosphorus pesticides, chlorpyrifos-methyl and pirimiphos-methyl, in plant ingredients used for aquafeed production. In the present study, we developed a reliable and sensitive analytical method, based on liquid chromatography coupled to tandem mass spectrometry, for the determination of these pesticides and their main metabolites in warm water (zebrafish) and cold water (Atlantic salmon) species, where possible differences in metabolites could be expected. The method was tested in whole zebrafish and in different salmon tissues, such as muscle, bile, kidney, fat, and liver. The final objective of this work was to assess kinetics of chlorpyrifos-methyl and pirimiphos-methyl and their main metabolites in fish tissue, in order to fill the knowledge gaps on these metabolites in fish tissues when fed over prolonged time.

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Acknowledgments

The authors wish to thank the staff at the Skretting ARC, Lerang Research Station for their excellent help with sampling and conducting the feeding trial. Tania Portolés acknowledges Ramon y Cajal Program from the Ministry of Economy and Competitiveness (RYC-2017-22525) for funding her research.

Funding

The present work was financed by the Norwegian Research Council (NFR) project “AQUASAFE” (254807).

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Correspondence to Marc H. G. Berntssen or Félix Hernández.

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The authors declare that there is no conflict of interest.

Research involving animals

The experiment complied with the guidelines of the Norwegian Regulation on Animal Experimentation and EC Directive 86/609/EEC. The National Animal Research Authority approved the protocol (ID 12091).

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Garlito, B., Ibáñez, M., Portolés, T. et al. LC-MS/MS method for the determination of organophosphorus pesticides and their metabolites in salmon and zebrafish fed with plant-based feed ingredients. Anal Bioanal Chem 411, 7281–7291 (2019). https://doi.org/10.1007/s00216-019-02104-6

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  • DOI: https://doi.org/10.1007/s00216-019-02104-6

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