Standard substances free quantification makes LC/ESI/MS non-targeted screening of pesticides in cereals comparable between labs

Tingting Wang, Jaanus Liigand, Henrik Lauritz Frandsen, Jørn Smedsgaard, Anneli Kruve*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

LC/ESI/MS is the technique of choice for qualitative and quantitative food monitoring; however, analysis of a large number of compounds is challenged by the availability of standard substances. The impediment of detection of food contaminants has been overcome by the suspect and non-targeted screening. Still, the results from one laboratory cannot be compared with the results of another laboratory as quantitative results are required for this purpose. Here we show that the results of the suspect and non-targeted screening for pesticides can be made quantitative with the aid of in silico predicted electrospray ionization efficiencies and this allows direct comparison of the results obtained in two different laboratories. For this purpose, six cereal matrices were spiked with 134 pesticides and analysed in two independent labs; a high correlation for the results with the R2 of 0.85.
Original languageEnglish
Article number126460
JournalFood Chemistry
Volume318
Number of pages7
ISSN0308-8146
DOIs
Publication statusPublished - 2020

Keywords

  • Quantification without standards
  • Pesticides
  • LC/ESI/MS
  • Food monitoring
  • Cereal

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