Extention and interlaboratory comparison of an LC-MS/MS multi-class method for the determination of 15 different classes of veterinary drug residues in milk and poultry feed

Lidija Kenjeric, Michael Sulyok, Alexandra Malachova, Brett Greer, Oluwatobi Kolawole, Brian Quinn, Christopher T Elliott, Rudolf Krska

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Abstract

An HPLC-MS/MS multi-class method for quantitation of 15 different classes of veterinary drug residues (>140 analytes) in milk and poultry feed was developed and validated. Accuracy criteria for routine laboratories were met for the majority of analytes, > 83 % in milk and between 50 and 60 % in chicken feed, with an apparent recovery of 60-140 %. Extraction efficiency criteria were met for >95 % of the analytes for milk and > 80 % for chicken feed. Intermediate precision meets the SANTE criterion of RSD < 20 % for 80-90 % of the analytes in both matrices. For all analytes with an existing MRL in milk, the LOQ was below the related MRL. Twenty-nine samples of commercial milk and chicken feed were analyzed within the interlaboratory comparison. No residues of veterinary drugs were found in the milk samples. However, the feed samples exhibited high levels of nicarbazin, salinomycin, and decoquinate.
Original languageEnglish
Article number138834
Number of pages10
JournalFood Chemistry
Volume449
Early online date09 Apr 2024
DOIs
Publication statusEarly online date - 09 Apr 2024

Keywords

  • Milk
  • Chicken feed
  • Extraction techniques
  • Interlaboratory comparison
  • Validation
  • LC-MS/MS

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