期刊
CARBOHYDRATE RESEARCH
卷 343, 期 16, 页码 2813-2818出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carres.2008.05.024
关键词
Atmospheric pressure photoionization mass spectrometry (APPI) oligosaccharides of D-xylan type; Fragmentation; Xylooligosaccharides
资金
- APVV [51-017905, 0650-07]
- Institut de Chimie des Substances Naturelles (CNRS)
Three D-Xylan type per-O-methylated trisaccharides with various types of linkages between the D-xylo-pyranose units were examined by atmospheric pressure photoionization (APPI) mass spectrometry in the positive ion mode. The most interesting feature of a thermospray mass spectrum using the APPI source with UV lamp switched off, is the exclusive production of [M+Na](+) adduct ions. [M+Na](+) cationized ions are the most abundant species in the case of APPI mass spectrometry. The second ionization process has no analogy in the case of substances studied using APPI to date. This aspect involves the addition of a water molecule to the molecular ion of a per-O-methylated saccharide, giving rise to [M+H2O](center dot+) adduct ions. The [M+H2O](center dot+) species are readily detected at m/z 544, and are clearly visible for all three isomers studied. The MS/MS spectrum of [M+Na](+) ions contains a base peak at m/z 375, produced by a Y-type cleavage of the trisaccharide, along with a hydrogen rearrangement on the terminal interglycosidically linkage glycosidic oxygen atom. The [M+H2O](center dot+) species fragment largely give rise to ions at m/z 175, 143 and, as a result, the m/z 111 ion is unique to nonreducing terminal units. (C) 2008 Elsevier Ltd. All rights reserved.
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