Mass spectrometry of oligosaccharides(I) - Formation of the [M+NH4](+) ion of oligosaccharides in fast atom bombardment mass spectrometry

摘要

In positive-ion fast atom bombardment (FAB) mass spectrometry, when oligosaccharides are mixed with an appropriate amount of NH4Cl, a highly abundant [M+NH4](+) peak appears in FAB mass spectra. From the adduct ion [M+NH4](+), the molecular weights of oligosaccharides can be determined definitively. This technique may especially be applied to analyze the mixture of oligosaccharides. [References: 8]