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See Chinese contents: GB/T 21311-2007 GB/T 21311-2007: Determination of residues of nitrofuran metabolites in foodstuffs of animal origin -- HPLC-MS/MS method
This Standard specifies the HPLC-MS/MS method for determination of residues for nitrofuran metabolites: 3-amino-2-oxazolidinone (AOZ), 5-morpholinomethyl-3-amino-2-oxazolidinone (AMOZ), 1-amino-hydantoin (AHD) and semi-carbazide (SEM), in foodstuffs of animal origin. This Standard is applicable to the qualitative confirmation and quantitative determination of residues for nitrofuran metabolites: 3-amino-2-oxazolidinone, 5-morpholinomethyl-3-amino-2-oxazolidinone, 1-amino-hydantoin and semi-carbazide, in muscle, offal, fish, shrimp, eggs, milk, honey and casings.
