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For the simultaneous identification and quantification of five nitrofurans metabolites in farmed shrimp and fish, 3-amino-2-oxazolidinone (AOZ), 3-amino-5-morpholinomethyl-2-oxazolidinone (AMOZ), 1-aminohydantoine (AHD), semicarbazide (SEM), and 3,5-dinitrosalicylic acid hydrazide (DNSH), an accurate, precise, and specific method was developed. The mixture of water and methanol (60/40;  v/v ) was found to be the final optimised solvent for injection. The analytical run duration was 7 min, and the mobile phase included 2 mM methanol and ammonium formate. The new reference point for action (RPA) of 0.50 µg kg −1  as per EC/1871/2019 was taken into consideration and evaluated for the performance characteristics as per the CIR (EC)/2021/808 criteria. Specificity, relative retention time (≤0.25%) relative ion ratio (≤40%), linearity (0.25 to 2.0 µg kg −1 ), trueness (between 82.8 and 118.1%), repeatability (RSD r  ≤14%), within lab reproducibility (RSD wr  ≤16.9%), CCα (0.32–0.36 μg kg −1 ), ruggedness and relative matrix effect (≤14.26%) achieved acceptable values.

food additives and contaminants: part a

Simultaneous determination of five metabolites of nitrofurans including the metabolite nifursol in shrimp and fish by UPLC- MS/MS: in-house method validation according to commission implementing regulation (EU) 2021/808