title: An optimised method for the accurate determination of zeranol and diethylstilbestrol in animal tissues using isotope dilution-liquid chromatography/mass spectrometry.
abstract: Isotope dilution-liquid chromatography/mass spectrometry (ID-LC/MS) has been established as a candidate reference method for the accurate determination of growth promoters (zeranol, taleranol, and diethylstilbesterol) in raw meat samples. Sample preparation processes including an enzymatic hydrolysis, extraction, and SPE clean-up were optimised. The sensitivity difference of trans- and cis-diethylstilbestrol (isomerizing in sample preparation processes) by the LC/MS was measured by running a trans/cis mixture (ratio measured by a quantitative NMR) with and without sample matrices, and applied for the determination of total diethylstilbestrol. Validity, repeatability, and reproducibility of the analytical method were tested by measuring gravimetrically fortified samples (chicken breast, bovine muscles, and porcine muscle) in a number of different time periods. Measurement results agreed with the fortified values within their uncertainties. The method provided accurate results of the target analytes in the range of 0.05-15 μg/kg with the relative expanded uncertainty of 2-15%.
authors.affiliation: Division of Metrology for Quality of Life, Korea Research Institute of Standards and Science, Yuseong, Daejon 305-600, Republic of Korea.
authors.forename: Hyesun
authors.initials: H
authors.lastname: Han
authors.forename: Byungjoo
authors.initials: B
authors.lastname: Kim
authors.forename: Sueg Geun
authors.initials: SG
authors.lastname: Lee
authors.forename: Jeongkwon
authors.initials: J
authors.lastname: Kim
mesh_terms: D000818:Animals; D002417:Cattle; D002645:Chickens; D002853:Chromatography, Liquid / Q000295:instrumentation / Q000379:methods*; D004054:Diethylstilbestrol / Q000737:chemistry*; D005506:Food Contamination / Q000032:analysis; D006133:Growth Substances / Q000737:chemistry*; D007536:Isomerism; D013058:Mass Spectrometry / Q000295:instrumentation / Q000379:methods*; D008460:Meat / Q000032:analysis*; D018482:Muscle, Skeletal / Q000737:chemistry*; D013552:Swine; D015029:Zeranol / Q000737:chemistry*
chemical_list: D006133:Growth Substances; D004054:Diethylstilbestrol; D015029:Zeranol