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Determination of melamine and its analogues in egg by gas chromatography-tandem mass spectrometry using an isotope dilution technique.

Authors
  • Miao, H
  • Fan, S
  • Zhou, P P
  • Zhang, L
  • Zhao, Y F
  • Wu, Y N
Type
Published Article
Journal
Food additives & contaminants. Part A, Chemistry, analysis, control, exposure & risk assessment
Publication Date
Nov 01, 2010
Volume
27
Issue
11
Pages
1497–1506
Identifiers
DOI: 10.1080/19440049.2010.496795
PMID: 20700844
Source
Medline
License
Unknown

Abstract

A method was developed for the simultaneous determination of melamine, ammeline, ammelide, and cyanuric acid in egg using gas chromatography-tandem mass spectrometry (GC-MS/MS). The samples were first extracted by the solution of diethylamine-water-acetonitrile (10:40:50, v/v/v). Clean-up employed an 'On Guard II' RP cartridge, and the dried elute was derivatised using bis-(trimethylsilyl)trifluoroacetamide (BSTFA) with 1% trimethylchlorosilane (TMCS). Derivatised samples were analysed by GC-MS/MS using multiple-reaction monitoring (MRM) with (13)C(3)-(15)N(3)-labelled melamine and cyanuric acid as internal standards. Blank samples of egg were spiked with the four analytes at concentration level of 0.1, 0.5, 1.0 mg kg(-1), and the intra-day and inter-day recoveries were in the range 75.7-122.5% with the relative standard deviation (RSD) from 2.6% to 22.8%. Decision limits (CCα, α = 0.01) for melamine, ammeline, ammelide, and cyanuric acid in egg samples and milk powder were 3.5-5.9 and 2.5 to 3.8 µg kg(-1), and the detection capabilities (CCβ, β = 0.05) were 4.9-8.4 and 3.6-9.5 µg kg(-1), respectively. The method was successfully applied to egg samples and milk products as well. Satisfactory results were obtained as part of the 2009 European Union melamine proficiency test.

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