The investigation for the presence of diarrhetic shellfish poisoning (DSP) toxins, okadaic acid (OA), and dinophysistoxin-1 (DTX-1), in mussels (Mytilus galloprovincialis) harvested in Thermaikos Gulf (northern Aegean Sea) is reported. The digestive glands of mussels were homogenized with methanol -water (80 : 20 v/v), and OA was extracted from the homogenate with hexane-chloroform (50 : 50 v/v). OA was reacted 2153 with 9-anthryldiazomethane (ADAM) in methanol for 1 hr at 358C. The product was purified by passing through a silica solid phase extraction cartridge before being determined by reversed-phase liquid chromatography with fluorimetric detection (HPLC/FLD). Linear calibration curves (r ¼ 0.9993), in the typical analytical range of 1 -10 ng OAinjected and detection limit of 0.14 ng OA-injected (S/N 3 : 1) were obtained. Recovery of the toxin from mussels ranged from 100.4% to 110.4%. Analysis of samples during a DSP episode in 2002 indicated the presence of OA at levels above the regulatory limit, while DTX-1 was detected in only one sample.
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