一些小寡糖的正离子快原子轰击质谱分析
Positive ion fast atom bombardment mass spectrometry of some small oligosaccharides.
作者信息
Dallinga J W, Heerma W
机构信息
Laboratory for Analytical Chemistry, University of Utrecht, The Netherlands.
出版信息
Biol Mass Spectrom. 1991 Mar;20(3):99-108. doi: 10.1002/bms.1200200302.
Positive ion fast atom bombardment mass spectrometry appears to be a very useful method for the determination of molecular weight and composition of underivatized di- and trisaccharides. Information on the identity of the monosaccharide units can be obtained from the metastable ion and collisional activation spectra of selected ions. The type of linkage between the monosaccharides is reflected in some spectral characteristics, but the differences are relatively small and do not always allow an unambiguous identification. The position of a fructose unit in a trisaccharide molecule is shown by the collisional activation spectra of the [M + H]+ ion, as an anhydrofructose molecule is easily eliminated from the ions in which fructose is in a terminal position.
正离子快原子轰击质谱法似乎是一种非常有用的方法，可用于测定未衍生化的二糖和三糖的分子量及组成。关于单糖单元的身份信息可从选定离子的亚稳离子和碰撞活化谱中获得。单糖之间的连接类型在某些光谱特征中有所体现，但差异相对较小，并不总是能明确鉴定。三糖分子中果糖单元的位置可通过[M + H]+离子的碰撞活化谱显示，因为当果糖处于末端位置时，脱水果糖分子很容易从离子中消除。
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