title: The repeatability of two HPLC methods and the PP2A assay in the quantification of diarrhetic toxins in blue mussels (Mytilus edulis).
abstract: Repeatability in the quantification of diarrhetic shellfish toxins was investigated for two fluorometric HPLC methods and a colorimetric PP2A assay, using agreement analysis. Blue mussels (Mytilus edulis) from the Sognefjord on the southwest coast of Norway were sampled during the periods of July to October, 1996, March to November, 1997, and October to December, 1998. The results from the first and the duplicate measurement were found to be very similar for both HPLC methods using two fluorogenic reagents, 4-bromomethyl,7-methoxycoumarin and 9-anthryl diazomethane, and the colorimetric PP2A inhibition assay in detection of diarrhetic shellfish toxins. The levels of agreement between the measurements were satisfactory for all three methods. Significant correlations were found between the level of observation and the absolute difference between the two measurements and were mainly due to concentrations of OA/DTX-1 higher than 100 microg/100 g mussel meat. However, the precision of quantifying DSP toxins in the upper level was not found to be less than in the lower level. Both the HPLC methods and the PP2A assay were found to give repeatable results and thereby found to be reliable.
authors.affiliation: Department of Pharmacology, Microbiology and Food Hygiene, Norwegian School of Veterinary Science, Oslo, Norway. hanne.m.ramstad@veths.no
authors.forename: H
authors.initials: H
authors.lastname: Ramstad
authors.forename: S
authors.initials: S
authors.lastname: Larsen
authors.forename: T
authors.initials: T
authors.lastname: Aune
mesh_terms: D000818:Animals; D049872:Bivalvia / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid; D003967:Diarrhea / Q000209:etiology*; D008978:Mollusk Venoms / Q000032:analysis*; D010749:Phosphoprotein Phosphatases / Q000032:analysis*; D012044:Regression Analysis; D057096:Shellfish Poisoning
chemical_list: D008978:Mollusk Venoms; D010749:Phosphoprotein Phosphatases