Seven new microcystin variants discovered from a native <i>Microcystis aeruginosa</i> strain – unambiguous assignment of product ions by tandem mass spectrometry

Abstract

This work shows the interference of isobarics and isomers in the study of unknown MCs, and, therefore, high mass accuracy is important to avoid false assignments. Moreover, the peak list provided here (30-50 fragments unambiguously assigned for ten MCs) can be used as a reference for the discovery of MCs from environmental samples.