ISSN:
0951-4198
Keywords:
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Physics
Notes:
Electron ionization (EI), chemical ionization (CI) and fast-atom bombardment (FAB) mass spectra of the marine toxin okadaic acid and its syntheticf methyi, pentafurobenzyl, and trimethylislyl ester and ether derivatives were generated. Several ionization conditions and-processing methods were used to obtain positive- and negative-ion conventional spectra and tandem (MS/MS) spectra. The EF 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. Pentafluorbenzyle ester derivatives provided intense carboxylate ions under electron-captute ionization. Analytically useful MS/MS spectra obtained by low-energy collision-induced decomposition of the carboxylate anion produced from the tetrasilylated pentafluorobenzylokadaate.
Additional Material:
12 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/rcm.1290050608
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