Structure elucidation of the core regions from Citrobacter O4 and O36 lipopolysaccharides by chemical and enzymic methods, gas chromatography/mass spectrometry, and NMR spectroscopy at 500 MHz

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Abstract
Novel enterobacterial core oligosaccharides were isolated from Citrobacter 04 and 036 lipopolysaccharides, and their structures were determined by methylation analysis, Smith degradation and enzymatic degradations, gas chromatography/mass spectrometry, and two-dimensional phase-sensitive correlated, relayed coherence transfer, double-quantum, triple-quantum-filtered, and nuclear Overhauser effect (NOE) 1H NMR spectroscopy at 500 MHz. In the formulas, all hexose residues are D-hexopyranoses, and heptoses are L-glycero-D-manno-heptopyranoses.