Autor/a:
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Giménez Papiol, Gemma; Caillaud, A.; Cañete, E.; De la Iglesia González, Pablo; Eixarch Puigcerver, Helena; Fernández-Tejedor, Margarita; Franco, J.; Riobó, P.; Diogène Fadini, Jorge
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Resum:
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The development, validation, comparison and evaluation of analytical methods for marine
toxins rely on the availability of toxic material. Within the project JACUMAR PSP, our
interest is mainly focused on autochthonous bivalve species with the toxic profile of
Alexandrium minutum, since this is the principal species involved regionally in PSP
outbreaks. Mussels and oysters were exposed during few days in the harbor of Vilanova i la
Geltrú, to blooms reaching a maximum A. minutum concentration of 200,000 cells L-1 in
2008, and 40,000 and 800,000 cells L-1, in 2009. Mussels, oysters and clams were exposed to
one bloom of 22,000 cells L-1 in the harbor of Cambrils in 2009. In all situations higher toxic
levels analyzed by HPLC-FD with postcolumn oxidation were observed in mussels (i.e.
1,200-2,500 μg eq. STX kg-1) than in oysters (i.e. 60-800 μg eq. STX kg-1) exposed to the
same bloom. Blooms with higher concentrations of A. minutum did not correspond to higher
levels of PSP toxins in bivalves. These differences may be explained by differences in A.
minutum population dynamics, toxin production or in the physiological state or behaviour of
shellfish. These results confirm that mussels concentrate more PSP toxins from A. minutum
than oysters and clams. |