Abstract
Comparison of pectenotoxin (PTX) profiles of toxic dinoflagellate Dinophysis acuta, Greenshell mussels ( Perna canaliculus) and Blue mussels ( Mytilus galloprovincialis) collected from Wedge Point, Queen Charlotte Sound, New Zealand was carried out by liquid chromatography–mass spectrometry with turbo-ionspray ionization. Although the major PTX homologue in D. acuta was pectenotoxin-2 (PTX2), both Greenshell and Blue mussels contained pectenotoxin-2 seco acid (PTX2SA) as the predominant toxin. More than 90% of PTX2 isolated from D. acuta was rapidly converted to PTX2SA and its epimer 7- epi-pectenotoxin-2 seco acid (7- epi-PTX2SA) in the Greenshell mussel extracts. The conversion from PTX2 to PTX2SA and 7- epi-PTX2SA was not observed in phosphate buffers at various pH ranging from 4.1 to 9.1. These findings indicate that PTX2SA and 7- epi-PTX2SA are not artifact toxins resulting from hydrolysis of PTX2, but arise from the conversion of PTX2 by mussel tissues.
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