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The effect of pH on thermal decomposition of microcystin-LR was examined. Decomposition of microcystin-LR occurred at pH 9 and temperatures of 21–30°C, which mimic the natural conditions in summer. Microcystin-LR also decomposed at pH 1 and a temperature of 40°C. The half-life of microcystin-LR was 3 and 10 weeks at pH 1 and 9, respectively. The decomposition products were analyzed by Frit-fast atom bombardment liquid chromatography/mass spectrometry, or Frit-FAB LC/MS, and were formed mainly by hydrolysis of the Mdha moiety to produce several linearized peptides. In the presence of methanol in the reaction, esterification was predominant over hydrolysis under acidic conditions. The contribution of thermal decomposition is smaller than that of other factors.
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Harada et al. (1996) studied this question.
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