Determination of paralytic shellfish toxins in Portuguese shellfish by automated pre-column oxidation

Toxicon : Official Journal of the International Society on Toxinology
P Vale, M A de M Sampayo


Automated pre-column oxidation (the method of Lawrence) was implemented on a routine basis since the end of 1996 to study paralytic shellfish poisoning (PSP) toxins in Portuguese shellfish. Liquid chromatography confirmed the presence of PSP toxins when the known toxic algae were present: Gymnodinium catenatum and/or Alexandrium cf. lusitanicum. On the other side, it has eliminated PSP toxins as a possible recurrent contaminant in oysters from Sado estuary. These oysters were already known to contain high levels of some metals (mainly zinc, copper and cadmium) due to their location in a contaminated area and their particular physiology prone to accumulate metals. The presence of PSP toxins in Scrobicularia plana from Mondego estuary and Tellina crassa from the northern coast, during the absence of the above toxic microalgae in the water column, was confirmed. Unlike other shellfish, these two genera have the feeding habit of aspirating more sediment than organisms in suspension, and probably ingest from the sediment resting cysts of PSP producing microalgae. This is another route of contamination that may help to explain why after a bloom certain shellfish species maintain toxicity for long periods. The method revealed to have ...Continue Reading


Nov 16, 2001·Phytochemical Analysis : PCA
Jan 27, 2010·Analytical and Bioanalytical Chemistry·A R HumpageS M Froscio
Jan 4, 2001·Toxicon : Official Journal of the International Society on Toxinology·P Vale, M A Sampayo
Oct 16, 2001·Toxicon : Official Journal of the International Society on Toxinology·H TalebM Blaghen
Feb 1, 2002·Toxicon : Official Journal of the International Society on Toxinology·Paulo Vale, Maria Antónia de M Sampayo
Feb 5, 2003·Toxicon : Official Journal of the International Society on Toxinology·Hamid TalebMohammed Blaghen
Feb 19, 2010·Biomedical and Environmental Sciences : BES·Wei-Dong YangHong-Ye Li
Dec 2, 2008·Toxicon : Official Journal of the International Society on Toxinology·Paulo ValeAndrea Vilar
Sep 20, 2005·Toxicon : Official Journal of the International Society on Toxinology·Reqia SagouMohamed Loutfi
Aug 19, 2020·Environmental Science and Pollution Research International·Paulo Vale

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