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Structural study of spirolide marine toxins by mass spectrometry Part II. Mass spectrometric characterization of unknown spirolides and related compounds in a cultured phytoplankton extractdissociation mass spectrometry

Par Conseil national de recherches du Canada

DOITrouver le DOI : https://doi.org/10.1007/s00216-003-2296-0
AuteurRechercher : 1; Rechercher : ; Rechercher : 1
Affiliation
  1. Conseil national de recherches du Canada. Institut des biosciences marines du CNRC
FormatTexte, Article
Sujetion-trap mass spectrometry; Alexandrium ostenfeldii; spirolide marine toxins; triple-quadrupole mass spectrometry; fourier-transform ion cyclotron resonance mass spectrometry; full-scan mass spectrometry; selected-ion monitoring; collision-induced dissociation; infrared multiphoton dissociation; automated mass-based fractionation; phytoplankton
Résumé
The spirolides are a family of marine biotoxins derived from the dinoflagellate Alexandrium ostenfeldii, recently isolated from contaminated shellfish and characterized. A crude phytoplankton extract has been extensively studied for mass spectrometric determination and characterization of several known spirolides and previously unreported compounds. The complex sample was initially analyzed by full-scan mass spectrometry in an ion-trap instrument, enabling identification of several components. Subsequent analysis by selected-ion monitoring in a triple-quadrupole instrument resulted in the confirmation of the identities of the compounds detected in the ion trap. Purification of the crude extract was performed using an automated mass-based fractionation system, yielding several fractions with different relative contributions of the spirolide components. Collision-induced dissociation (CID) in the triple-quadrupole instrument produced significant fragment ions for all identified species. Selective enrichment of some minor compounds in certain fractions enabled excellent CID spectra to be generated; this had previously been impossible, because of interferences from the major toxins present. Fourier-transform ion cyclotron resonance (FTICR) mass spectrometry was then performed for accurate determination of the masses of MH+ ions of all the species present in the sample. Additionally, infrared multiphoton dissociation in the FTICR instrument generated elemental formulae for product ions, including those formed in the previous collisional activation experiments. Collection of these results and the fragmentation scheme proposed for the main component of the extract, 13-desmethyl spirolide C, from part I of this study, enabled elucidation of the structures of some uncharacterized spirolides and some biogenetically related compounds present at previously unreported masses.
Date de publication
Conditions d’utilisation
  • © Springer-Verlag 2003
Dans
  • Analytical and Bioanalytical Chemistry 378, nº 4 (février 2004) : 977–986.
Langueanglais
Publications évaluées par des pairsOui
Numéro du CNRCNRCC 42396
1326
Numéro NPARC3538341
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Identificateur de l’enregistrementc2737959-abf4-4db1-a4ca-3970f903cc02
Enregistrement créé2009-03-01
Enregistrement modifié2020-04-17
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