Abstract

Conjugated metabolites of abscisic acid (ABA) have been characterized by their chemical ionization (CI) mass spectra using isobutane and ammonia as reagent gases. The CI mass spectra usually consist of quasimolecular ions ([QM]+), and constituent aglycone- and.sugar-derived ions. Hence, the spectra are simply interpreted and afford useful information for structutal characterization. CI examinations of ABA and its unconjugated metabolites and collisionally activated dissociation (CAD) measurements of selected ions were helpful in characterizing the constituent aglycones. The distinction between the two glycosidal forms, glycoside and glycosyl ester, has been also discussed in the corresponding conjugates. Confirmation of the fragmentation pathways via recognition of the diagnostic ions can be made by the extensive use of ammonia- d3 as an additional reagent gas.

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