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Characterization of positional and anomeric isomers of methyl 2-O- and 3-O-sulfo-D-glucopyranosiduronic acids and methyl 2-O- and 3-O-sulfo-D-glucopyranosides by secondary ion mass spectrometry

โœ Scribed by Tadashi Ii; Satoshi Okuda; Takashi Hirano; Kazuo Tsujimoto; Mamoru Ohashi

Book ID
102560294
Publisher
John Wiley and Sons
Year
1993
Tongue
English
Weight
480 KB
Volume
28
Category
Article
ISSN
1076-5174

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โœฆ Synopsis

Secondary ion mass spectrometry (SIMS) of anomeric pairs of methyl 2-0-and 3-O-sulfo-D-ghcopyranosiduronic acids and methyl Wand 3-O-sulfo-D-ghcopyranosides show the deprotonated molecule in the negative-ion mode and ammoniated and sodiated molecules in the positive-ion mode. The four isomers were distinguished from each other by linked scanning at constant B/E in negative-and positive-ion SIMS, which gave information cbaracteristic of the position of the sulfate group and even the configuration of the anomeric methoxy group. The main fragmentation processes correspond to the loss of methanol and the elimination of SO3.

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