title: [Analysis of hexabromocyclododecane diastereoisomers in foods of animal origin using ultra performance liquid chromatography-mass spectgrometry and isotope dilution].
abstract: A method for the detection of the alpha, beta and gamma-diastereoisomers of hexabromocyclododecane (HBCDs) in foods of animal origin, such as fish, chick, milk, butter etc., was developed using ultra performance liquid chromatography-electrospray ionization mass spectrometry (UPLC-ESI-MS) and isotope dilution. The HBCDs with the spiked isotopic 13C-HBCDs, the internal standards, were extracted using Soxhiet extraction, and further purified using acidic silica treatment and solid phase extraction. The separation of HBCDs was performed on Waters ACQUITY UPLC system with the column of BEH C8 and the gradient elution solvent of methanol-acetonitrile and water at a flow rate of 0.2 mL/min. The HBCDs were identified on the basis of the retention times and precursor ions, and quantitatively determined under the selected ion recording mode, m/z 640.7 for the [M-H]-ion. The limits of detection (LODs) of HBCDs ranged from 0.1 to 0.4 ng/g; and the limits of quantification (LOQs) ranged from 0.4 to 1.2 ng/g. The average recoveries ranged from 92.9% to 99.3% for the spiked levels of 0.6, 2.0 and 6.0 ng/g. with the relative standard deviations (RSDs) between 3.1% and 8.0%.
authors.affiliation: National Institute for Nutrition and Food Safety, Chinese Center for Disease Control and Prevention, Beijing, China. szx0127@ccmu.edu.cn
authors.forename: Zhixiong
authors.initials: Z
authors.lastname: Shi
authors.forename: Jinfang
authors.initials: J
authors.lastname: Feng
authors.forename: Jingguang
authors.initials: J
authors.lastname: Li
authors.forename: Yunfeng
authors.initials: Y
authors.lastname: Zhao
authors.forename: Yongning
authors.initials: Y
authors.lastname: Wu
mesh_terms: D000818:Animals; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D005504:Food Analysis / Q000379:methods*; D006842:Hydrocarbons, Brominated / Q000032:analysis* / Q000737:chemistry*; D007554:Isotopes; D057230:Limit of Detection; D016014:Linear Models; D013058:Mass Spectrometry / Q000379:methods*; D013237:Stereoisomerism; D013997:Time Factors
chemical_list: D006842:Hydrocarbons, Brominated; D007554:Isotopes; C089796:hexabromocyclododecane