2003 年 51 巻 2 号 p. 374-383
Lewis-type trisaccharides were analyzed by MALDI-MS. The post-source decay spectra of Lewisx(Lex) and Lewisa (Lea) trisaccharides differed each other because of the β-elimination at C-3 in the N-acetyl glucosamine of the reducing-end of Lex. The mechanism of the β-elimination in N-acetyl glucosamine of Lex was analyzed by combined in-source decay/post-source decay (ISD/PSD) measurements. The combined ISD/PSD measurements were powerful tool for the fine analysis of the mechanism of the post-source decay of the oligosaccharides. ISD/PSD measurements were also useful for the assignments of the chemical species of PSD ions.