title: Determination of microcystin variants and related peptides present in a water bloom of Planktothrix (Oscillatoria) rubescens in a Spanish drinking water reservoir by LC/ESI-MS.
abstract: A water bloom of Planktothrix (Oscillatoria) rubescens was observed in a drinking water reservoir in central Spain in 2003. Microcystins where analysed by LC/ESI-MS in 21 samples collected from this reservoir in five different days between March and May. A demethylated variant of microcystin-RR was identified as the major microcystin in most samples. Trace levels of microcystin-LR, -RR and -YR were detected in some samples. Four less common microcystins, with [M+H]+ ions at m/z 960, 981, 1045 and 1053, were also found. Total extracellular microcystin concentration varied from 0.010 to 19.126 microg l(-1). Furthermore, anabaenopeptins B and F as well as Oscillamide Y were also identified in these samples.
authors.affiliation: Mass Spectrometry Laboratory, Department of Ecotechnologies, IIQAB-CSIC, C/Jordi Girona 18-26, 08034 Barcelona, Spain.
authors.forename: Mónica
authors.initials: M
authors.lastname: Barco
authors.forename: Cintia
authors.initials: C
authors.lastname: Flores
authors.forename: Josep
authors.initials: J
authors.lastname: Rivera
authors.forename: Josep
authors.initials: J
authors.lastname: Caixach
mesh_terms: D001427:Bacterial Toxins / Q000032:analysis / Q000737:chemistry*; D002853:Chromatography, Liquid / Q000379:methods*; D000458:Cyanobacteria / Q000737:chemistry* / Q000254:growth & development; D008387:Marine Toxins; D052998:Microcystins; D015394:Molecular Structure; D010456:Peptides, Cyclic / Q000032:analysis / Q000737:chemistry*; D013030:Spain; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D014867:Water / Q000737:chemistry*; D014871:Water Microbiology
chemical_list: D001427:Bacterial Toxins; D008387:Marine Toxins; D052998:Microcystins; D010456:Peptides, Cyclic; C496665:anabaenopeptin B; C436355:anabaenopeptin F; C436354:oscillamide Y; D014867:Water; C065685:microcystin YR; C078588:microcystin; C063855:microcystin RR; C057862:cyanoginosin LR