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. 2020 Apr 7;12(4):232. doi: 10.3390/toxins12040232

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Structures and exact negative ionisation m/z of microcystins (MCs) identified in cultures AB2017/14 and AB2017/15 in this study, showing characteristic product ions at m/z 135.0804 (positive) and 128.0353 (negative) LC–MS/MS spectra (see Table 4 and Table S1). The origins of additional positive mode product ions containing Mdha⁷ (R³ = Me) at m/z 375.1914 and 446.2286 are also shown. Note that the corresponding product ions containing Dha⁷ (R³ = H) have m/z 361.1758 and 432.2129, and m/z 393.2020 and 464.2391 for Mser⁷ (R⁴ = OH). A full version of this table including positive ionisation data is shown in the Supporting Information (Table S1). Abbreviations: Abu, aminobutyric acid; Dha, dehydroalanine; (H2)Tyr, dihydrotyrosine; (H4)Tyr, 4,5,6,7-tetrahydrotyrosine; Kyn, kynurenine; Mdha, N-methyldehydroalanine; Mlan, N-methyllanthionine; Mser, N-methylserine; Oia, oxindolyalanine; Tyr(OMe), methoxytyrosine.