1992
DOI: 10.1002/oms.1210270108
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Study of selected ions in the ammonia desorption chemical ionization mass spectra of peracetylated gentiobiose and two isotopically labelled peracetylated gentiobioses

Abstract: The ammonia desorption chemical ionization (NH,-DCI) mass spectra of peracetylated gentiobiose (1) and two isotopically labelled gentiobioses (2 and 3) were examined. Compound 2 is labelled with trideuteroacetyl groups in the non-reducing moiety and 3 with trideuteroacetyl groups in the reducing moiety. It is shown that the [ M + NH, -421 + ion is not formed direct from [ M + NH,] + by loss of ketene but appears to be formed by way of a nucleophilic acyl substitution reaction resulting in a neutral species whi… Show more

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“…Most of these are based on mass spectrometry (MS) and MS/MS approaches [4 -9]. Gas-phase stable complexes obtained by chemical ionization (CI) [10] with different reagents have been used for the structural characterization and differentiation of oligosaccharides and glycosides [11][12][13][14][15][16][17][18][19].…”
mentioning
confidence: 99%
“…Most of these are based on mass spectrometry (MS) and MS/MS approaches [4 -9]. Gas-phase stable complexes obtained by chemical ionization (CI) [10] with different reagents have been used for the structural characterization and differentiation of oligosaccharides and glycosides [11][12][13][14][15][16][17][18][19].…”
mentioning
confidence: 99%