A method was described for monitoring four nitrofuran metabolites including 5-methylmorpholino-3-
amino-2-oxazolidinone (AMOZ), 3-amino-2-oxazolidone (AOZ), 1-amino-hydantoin (AHD) and
semicarbazide (SEM) in aquatic products. The analytes were quantified by ultra-performance liquid chromatography–tandem
mass spectrometry operating in positive ion multiple monitoring mode (MRM)
after 2-nitrobenzaldehyde derivatization