title: Liquid chromatography-electrospray ionisation-mass spectrometry based method for the simultaneous determination of algal and cyanobacterial toxins in phytoplankton from marine waters and lakes followed by tentative structural elucidation of microcystins.
abstract: A liquid chromatography (LC)-based method with mass spectrometric (MS) detection was developed for simultaneous determination of various algal and cyanobacterial toxins extracted from phytoplankton occurring world-wide in marine waters and lakes. The method enables quantification of saxitoxin, anatoxin-A, domoic acid, nodularin, microcystins, okadaic acid and dinophysistoxin-1 with a single chromatographic run. In addition, the applied chromatographic conditions allow isolation and identification of substances suspected to be "new" microcystins (cyclic peptides) by fraction collection, hydrolysis, derivatisation of resulting free amino acids with the modified chiral Marfey's reagent N-alpha-(2,4-dinitro-5-fluorophenyl)-L-valinamide (L-FDVA) and enantioselective analysis of the amino acid derivatives by LC-ESI-MS.
authors.affiliation: Department of Food Chemistry, Faculty of Biology and Pharmacy, University of Jena, Dornburger Str. 25, 07743 Jena, Germany. dahlmann@mampf.ieu.uni-jena.de
authors.forename: Jens
authors.initials: J
authors.lastname: Dahlmann
authors.forename: Wes R
authors.initials: WR
authors.lastname: Budakowski
authors.forename: Bernd
authors.initials: B
authors.lastname: Luckas
mesh_terms: D002853:Chromatography, Liquid / Q000379:methods*; D000458:Cyanobacteria / Q000737:chemistry*; D056890:Eukaryota / Q000737:chemistry*; D005618:Fresh Water; D052998:Microcystins; D010456:Peptides, Cyclic / Q000737:chemistry*; D010839:Phytoplankton / Q000737:chemistry*; D015203:Reproducibility of Results; D012623:Seawater; D012680:Sensitivity and Specificity; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*
chemical_list: D052998:Microcystins; D010456:Peptides, Cyclic; C078588:microcystin