Effect of pH and temperature on the stability of cylindrospermopsin. Characterization of decomposition products
2016
Adamski, Michal | Żmudzki, Paweł | Chrapusta, Ewelina | Bober, Beata | Kaminski, Ariel | Zabaglo, Kornelia | Latkowska, Ewa | Bialczyk, J.
Research on the stability of cylindrospermopsin (CYN) with respect to abiotic factors in the context of decomposition pathway and forming products has been limited. In this study, the impacts of time, pH and temperature on the stability of CYN were examined. CYN is stable in acidic and neutral conditions, while alkalization accelerated its decomposition (maximum to 17% of initial concentration during 6weeks). The toxin is stable at room temperature (21±1°C) and at 40°C within 4h at various pH values. Boiling does not result in destruction of CYN molecule incubated in acidic and neutral conditions, whereas boiling under alkaline conditions led to faster decomposition (maximum to 18% of initial concentration within 4h). Decomposition products were detected among the results of these reactions. Proposed structures and fragmentation pathways for the products of CYN decomposition are presented. The high stability of CYN over a wide range of pH and temperature might have significant consequences for aquatic environment.
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