title: Determination of residues of cyromazine and its metabolite, melamine, in animal-derived food by gas chromatography-mass spectrometry with derivatization.
abstract: A gas chromatography-mass spectrometric (GC-MS) method was established for the determination of cyromazine and its metabolite, melamine, in animal-derived food. Chicken and tilapia muscle samples were spiked with (15)N(3)-melamine, extracted with an acidic acetonitrile/water solution, and defatted with dichloromethane. Egg and milk samples were directly extracted with 3% trichloroacetic acid. The extracts were purified using mixed cation-exchange cartridges, derived with N,O-bis(trimethylsilyl)trifluoroacetamide, and detected by GC-MS. Cyromazine and melamine were quantified by external standard methods except for the determination of melamine in animal muscle, which used an internal standard method. Recoveries ranged from 75.0 to 110.0%, and relative standard deviations were <15.0%. In animal muscle the limits of quantification (LOQs) were 20 microg/kg and the limits of detection (LODs) were 10 microg/kg for cyromazine and melamine. In milk and eggs the LOQs were 10 microg/kg and the LODs were 5 microg/kg for both analytes.
authors.affiliation: China Institute of Veterinary Drug Control, Beijing, People's Republic of China. zhuxinle@ivdc.gov.cn
authors.forename: Xinle
authors.initials: X
authors.lastname: Zhu
authors.forename: Shuhuai
authors.initials: S
authors.lastname: Wang
authors.forename: Qi
authors.initials: Q
authors.lastname: Liu
authors.forename: Qian
authors.initials: Q
authors.lastname: Xu
authors.forename: Shixin
authors.initials: S
authors.lastname: Xu
authors.forename: Huilan
authors.initials: H
authors.lastname: Chen
mesh_terms: D000818:Animals; D002417:Cattle; D002645:Chickens; D004531:Eggs / Q000032:analysis; D005506:Food Contamination / Q000032:analysis*; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D057230:Limit of Detection; D008460:Meat / Q000032:analysis; D008892:Milk / Q000737:chemistry; D010573:Pesticide Residues / Q000032:analysis* / Q000378:metabolism; D017210:Tilapia; D014227:Triazines / Q000032:analysis* / Q000378:metabolism
chemical_list: D010573:Pesticide Residues; D014227:Triazines; C028704:cyromazine; C011907:melamine