RT Journal Article T1 Method development and validation for the simultaneous determination of 21 antiviral drugs by ultra-high performance liquid chromatography-tandem mass spectrometry in chicken muscle and liver A1 Castiñeira Landeira, Ana A1 Sasse, Samantha A1 Broeren, Melissa A1 S. Sterk, Saskia A1 Arrizabalaga Larrañaga, Ane K1 Hilic chromatography K1 Residues K1 Control monitoring K1 Target analysis K1 Food safety K1 LC-MS/MS AB The recent unauthorization of antiviral drugs in food-producing animals according to Commission Delegated Regulation (EU) 2022/1644 have increased the need for food control laboratories to develop analytical methods and perform official controls. In this work, a simple and fast analytical methodology was developed for the simultaneous determination of 21 antiviral drugs in chicken muscle and liver by liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS). Chromatographic separation was achieved by an HILIC BEH amide column; followed by detection with a electrospray ionization source in positive and negative modes. Based on extraction efficiencies, critical parameters affecting sample treatment were optimized including the evaporation and clean up steps to extract the largest number of antiviral drugs and reduce interferences. The method was validated according to Commission Implementing Regulation (EU) 2021/808 in chicken muscle and liver. Most compounds showed a linearity of R2>0.9800, while decision limits were between 0.18 and 7.05 μg kg−1 and 0.19 and 36 μg kg−1 for chicken muscle and liver, respectively. Trueness and within-lab reproducibility were determined at three levels (n = 7) and the results showed values ranging from 81 to 133 % and 4.2–57 % for chicken muscle, and 71–136 % and 4.6–106 % for chicken liver, respectively. The applicability of the developed method was demonstrated by the analysis real samples. 20 samples from the National Residue Control Plan in the Netherlands were analyzed and although none of targeted compounds were detected it is important to continue the analysis of larger set of samples to address any possible food safety risks. PB Elsevier SN 0021-9673 YR 2025 FD 2025-02-22 LK https://hdl.handle.net/10347/46647 UL https://hdl.handle.net/10347/46647 LA eng NO Castiñeira-Landeira, A., Sasse, S., Broeren, M., Sterk, S. S., & Arrizabalaga-Larrañaga, A. (2025). Method development and validation for the simultaneous determination of 21 antiviral drugs by ultra-high performance liquid chromatography-tandem mass spectrometry in chicken muscle and liver. Journal of Chromatography A, 1743, 465711. 10.1016/j.chroma.2025.465711 NO This project was financially supported by the European Commission DG Health and Food Safety (EURL), and the Dutch Ministry of Agriculture, Nature and Food Quality under their statutory tasks program; WOT-02–003–007. Ana Castiñeira-Landeira would like to acknowledge to the Xunta de Galicia for the predoctoral contract ED481A/IN606A. DS Minerva RD 24 abr 2026