title: Confirmatory analysis of malachite green, leucomalachite green, crystal violet and leucocrystal violet in salmon by liquid chromatography-tandem mass spectrometry.
abstract: A method has been developed to analyse for malachite green (MG), leucomalachite green (LMG), crystal violet (CV) and leucocrystal violet (LCV) residues in salmon. Salmon samples were extracted with acetonitrile:McIIIvain pH 3 buffer (90:10 v/v), sample extracts were purified on a Bakerbond strong cation exchange solid phase extraction cartridge. Aliquots of the extracts were analysed by LC-MS/MS. The method was validated in salmon, according to the criteria defined in Commission Decision 2002/657/EC. The decision limit (CCalpha) was 0.17, 0.15, 0.35 and 0.17 microg kg(-1), respectively, for MG, LMG, CV and LCV and for the detection capability (CCbeta) values of 0.30, 0.35, 0.80 and 0.32 microg kg(-1), respectively, were obtained. Fortifying salmon samples (n=6) in three separate assays, show the accuracy to be between 77 and 113% for MG, LMG, LCV and CV. The precision of the method, expressed as RSD values for the within-laboratory reproducibility, for MG, LMG and LCV at the three levels of fortification (1, 1.5 and 2.0 microg kg(-1)), was less than 13%. For CV a more variable precision was obtained, with RSD values ranging between 20 and 25%.
authors: The State Laboratory, Young's Cross, Celbridge, Co. Kildare, Ireland. Geraldine.Dowling@statelab.ie
authors: Geraldine
authors: G
authors: Dowling
authors: Patrick P J
authors: PP
authors: Mulder
authors: Conor
authors: C
authors: Duffy
authors: Liam
authors: L
authors: Regan
authors: Malcolm R
authors: MR
authors: Smyth
mesh_terms: D000097:Acetonitriles / Q000494:pharmacology; D000814:Aniline Compounds / Q000032:analysis*; D000818:Animals; D002021:Buffers; D002138:Calibration; D002412:Cations; D002852:Chromatography, Ion Exchange; D002853:Chromatography, Liquid / Q000379:methods*; D005840:Gentian Violet / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D013058:Mass Spectrometry / Q000379:methods*; D015203:Reproducibility of Results; D012394:Rosaniline Dyes / Q000032:analysis*; D012474:Salmon
chemical_list: D000097:Acetonitriles; D000814:Aniline Compounds; D002021:Buffers; D002412:Cations; D012394:Rosaniline Dyes; C005095:malachite green; C475159:leucocrystal violet; C015320:leucomalachite green; D005840:Gentian Violet; C032159:acetonitrile