Journal of the Mass Spectrometry Society of Japan
Online ISSN : 1880-4225
Print ISSN : 1340-8097
ISSN-L : 1340-8097
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Structure Elucidation of Glykenin, Glycosidic Antibiotics from Basidiomycetes sp. VII. Structure Elucidation of the GK Components Using Tandem Mass Spectrometry
Fumiko NISHIDAKen-Ichi HARADAMakoto SUZUKITsuyoshi FUJITAHideo NAOKIVithaya MEEVOOTISOMTimothy W. FLEGELYodohathai THEBTARANONTHSuthum INTARARUANGSORN
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1995 Volume 43 Issue 1 Pages 37-44

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Abstract
The exact positions of the acetyl groups in the sugar moieties of the glycosidic antibiotics, the glykenin (GK) components, were elucidated using MS/MS technique under high energy collision conditions, because the frit-FAB LC/MS technique that was described in a preceding paper and other techniques were insufficient for the purpose. In the negative product ion spectra of (M-H)-, a charge-remote fragmentation based on a terminal carboxylic acid of the aglycone was observed, whereas many cleavage ions were observed in the positive product ion spectra of (M+Li)+. The diagnostic ions were selected from the cleavage ions of two bonds within the glycosidic ring in the product ion spectra of the (M+Li)+ and (M-H)-. The positions of the acetyl groups for each component could be determined by the presence or absence of these diagnostic ions, which enabled us to determine the structure of each of the GK components.
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© 1995 by The Mass Spectrometry Society of Japan
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