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1. (Article ID: 1810)
 
Knirel YA, Shashkov AS, Dmitriev BA, Kochetkov NK, Kasyanchuk NV, Zakharova IY
Antigenic polysaccharides of bacteria. 11. The structure and 13C NMR spectrum of O-specific polysaccharide from Pseudomonas cepacia
Bioorganicheskaya Khimia = Bioorganic Chemistry [Russian] 6(12) (1980) 1851-1859
 

O-specific polysaccharide, obtained by mild acid hydrolysis from lipopolysaccharide of Pseudomonas cepacia strain IMV 3181 was shown to be a homopolymer of D-rhamnose - monosaccharide rarery occuring in nature. On basis of PMR and 13C NMR spectral data, methylation analysis, Smith degradation, and optical rotation calculations, the repeating unit of the O-specific polysaccharide was assigned the following structure: (formula; see text). A 2-O-substituted β-D-rhamnose residue was shown to be an immunodeterminant sugar. The 13C spectra of O-specific polysaccharide, its oligosaccharide fragment obtained on Smith degradation, and of periodate oxidized polysaccharide, were interpreted. The effect of the attached monosaccharide on the chemical shifts of carbon atoms in 3-O-substituted rhamnopyranose residues is discussed.

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