Liquid chromatography-multiple tandem mass spectrometry for the determination of ten azaspiracids, including hydroxyl analogues in shellfish

被引:30
|
作者
Lehane, M [1 ]
Sáez, MJF [1 ]
Magdalena, AB [1 ]
Cañás, IR [1 ]
Sierra, MD [1 ]
Hamilton, B [1 ]
Furey, A [1 ]
James, KJ [1 ]
机构
[1] Cork Inst Technol, Dept Chem, Mass Spectrometry Ctr Proteom & Biotoxin Res, PROTEOBIO, Cork, Ireland
关键词
shellfish poisoning; toxins; azaspiracids;
D O I
10.1016/j.chroma.2003.10.045
中图分类号
Q5 [生物化学];
学科分类号
071010 ; 081704 ;
摘要
Azaspiracids (AZAs) are a group of polyether toxins that cause food poisoning in humans. These toxins, produced by marine dinoflagel-lates, accumulate in filter-feeding shellfish, especially mussels. Sensitive liquid chromatography-electrospray ionisation mass spectrometry (LC-ESI-MSn) methods have been developed for the determination of the major AZAs and their hydroxyl analogues. These methods, utilising both chromatographic and mass resolution, were applied for the determination of 10 AZAs in mussels (Mytilus edulis). An optimised isocratic reversed phase method (3 mum Luna-2 C-18 column) separated 10 azaspiracids using acetonitrile/water (46:54, v/v) containing 0.05% trifluoroacetic acid (TFA) and 0.004% ammonium acetate in 55 min. Analyte determination using MS3 involved trapping and fragmentation of the [M + H](+) and [M + H - H2O](+) ions with detection of the [M + H - 2H(2)O](+) ion for each AZA. Linear calibrations were obtained for AZA1, using spiked shellfish extracts, in the range 0.05-1.00 mug/ml (r(2) = 0.997) with a detection limit of 5 pg (signal : noise = 3). The major fragmentation pathways in hydroxylated azaspiracids were elucidated using hydrogen/deuterium (H/D) exchange experiments. An LC-MS3 method was developed using unique parent ions and product ions, [M + H - H2O - C9H10O2R1 R-3](+), that involved fragmentation of the A-ring. This facilitated the discrimination between 10 azapiracids, AZA1-10. Thus, this rapid LC-MS3 method did not require complete chromatographic resolution and the run-time of 7 min had detection limits better than 20 pg for each toxin. (C) 2003 Elsevier B.V. All rights reserved.
引用
收藏
页码:63 / 70
页数:8
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