Electron impact mass spectra of permethylated disaccharide alditols

✍ Scribed by Bengt Lindberg; Frank Lindh; Jörgen Lundsten; Sigfrid Svensson

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 481 KB
• Volume: 254
• Category: Article
• ISSN: 0008-6215
• DOI: 10.1016/0008-6215(94)84239-6

✦ Synopsis

The electron impact mass spectra (EIMS) of 19 permethylated hexopyranosyl-hexitols, monodeuterated at C'-1, four partially trideuteriomethylated analogues, and some other permethylated hexopyranosides have been investigated. In the formation of the A, ion from the hexopyranosyl-hexitols, only a minor part is formed by direct cleavage between the glycosyl group and the "aglycon". The major part is formed by elimination of neutral molecules from different primary ions resulting from cleavage between adjacent carbon atoms in the alditol residue. As a consequence of this facile elimination, these primary ions are not observed or are very weak. From a critical study of the mass spectra, diagnostic ions, from which the position of linkage to the alditol residue in these and related substances can be assigned, have been identified. From the relative intensities of the A,, AZ, and A, ions, glucopyranosyl groups can be distinguished from manno-and galacto-pyranosyl groups.