Abstract
Oxidation of neutral disaccharides yielded aldosyl aldonic acids which were methylated and separated by g.l.c. and subjected to mass spectrometry. The electron-impact fragmentation patterns afforded by these derivatives discriminated between (1 → 3), (1 → 4), and (1 → 6) linked residues and differed from that postulated for (1 → 2) intermolecular bonds. Primary scission of the aldonate moieties provided for the ionized hexosyl containing fragments which formed the high mass diagnostic peaks in these spectra. The mass spectra exhibited by the oxidized products could be correlated to those obtained from reduced, permethylated pseudoaldobiouronic acids.
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