Paralytic toxin profile of the marine dinoflagellate Gymnodinium catenatum Graham from the Mexican Pacific as revealed by LC-MS/MS

The paralytic shellfish toxin (PST) profiles of Gymnodinium catenatum Graham have been reported for several strains from the Pacific coast of Mexico cultured under different laboratory conditions, as well as from natural populations. Up to 15 saxitoxin analogues occurred and the quantity of each tox...

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Published in:Food additives & contaminants. Part A, Chemistry, analysis, control, exposure & risk assessment Chemistry, analysis, control, exposure & risk assessment, 2015-03, Vol.32 (3), p.381-394
Main Authors: Bustillos-Guzmán, José J., Band-Schmidt, Christine J., Durán-Riveroll, Lorena M., Hernández-Sandoval, Francisco E., López-Cortés, David J., Núñez-Vázquez, Erick J., Cembella, Allan, Krock, Bernd
Format: Article
Language:English
Subjects:
benzoyl analogues
Chromatography
Chromatography, High Pressure Liquid
Dinoflagellida - chemistry
Fluorescence
Gymnodinium catenatum
Mass spectrometry
Mexico
Oxidation
paralytic shellfish toxins
Saxitoxin - analogs & derivatives
Saxitoxin - analysis
Shellfish
Tandem Mass Spectrometry
toxin profile
Toxins
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Summary:The paralytic shellfish toxin (PST) profiles of Gymnodinium catenatum Graham have been reported for several strains from the Pacific coast of Mexico cultured under different laboratory conditions, as well as from natural populations. Up to 15 saxitoxin analogues occurred and the quantity of each toxin depended on the growth phase and culture conditions. Previous analysis of toxin profiles of G. catenatum isolated from Mexico have been based on post-column oxidation liquid chromatography with fluorescence detection (LC-FLD), a method prone to artefacts and non-specificity, leading to misinterpretation of toxin composition. We describe, for the first time, the complete toxin profile for several G. catenatum strains from diverse locations of the Pacific coast of Mexico. The new results confirmed previous reports on the dominance of the less potent sulfocarbamoyl toxins (C1/2); significant differences, however, in the composition (e.g., absence of saxitoxin, gonyautoxin 2/3 and neosaxitoxin) were revealed in our confirmatory analysis. The LC-MS/MS analyses also indicated at least seven putative benzoyl toxin analogues and provided support for their existence. This new toxin profile shows a high similarity (> 80%) to the profiles reported from several regions around the world, suggesting low genetic variability among global populations.
ISSN:1944-0049
1944-0057
DOI:10.1080/19440049.2014.1000978