Objective To establish a high performance liquid chromatography-electrospray ionization triplequadruple tandem mass spectrometric(HPLC-MS/MS) method for the determination of metronidazole(MNZ),dimetridazole(DMZ),ronidazole(RNZ),hydroxyl metronidazole(MNZOH) and 2-hydroxymethyl-1methyl5-nitroimidazole(HMMNI) in animal-borne food.Methods Animal tissue samples were extracted by ethyl acetate,and the fat was removed by methanol-hexane distribution.The extract was cleaned-up by HLB SPE cartridge.Identification o...