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  • Title: Mass spectral characteristics of okadaic acid and simple derivatives.
    Author: Bencsath FA, Dickey RW.
    Journal: Rapid Commun Mass Spectrom; 1991 Jun; 5(6):283-90. PubMed ID: 1804418.
    Abstract:
    Electron ionization (EI), chemical ionization (CI) and fast-atom bombardment (FAB) mass spectra of the marine toxin okadaic acid and its synthetic methyl, pentafluorobenzyl, and trimethylsilyl ester and ether derivatives were generated. Several ionization conditions and ion-processing methods were used to obtain positive- and negative-ion conventional spectra and tandem (MS/MS) spectra. The EI and the positive-ion CI spectra provided fragment ions characteristic of the structure, and the negative-ion CI and FAB spectra provided molecular ions. The addition of alkali salts to the FAB matrix resulted in reduced fragmentation and the formation of intense alkali-metal-cationized molecules. Pentafluorobenzyl ester derivatives provided intense carboxylate ions under electron-capture ionization. Analytically useful MS/MS spectra were obtained by low-energy collision-induced decomposition of the carboxylate anion produced from the tetrasilylated pentafluorobenzylokadaate.
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