Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1383875 | Carbohydrate Research | 2013 | 5 Pages |
Abstract
A high-molecular mass polysaccharide fraction was obtained by mild acid hydrolysis of the lipopolysaccharide of diazotrophic rhizobacterium Azospirillum brasilense SR80 followed by GPC on Sephadex G-50 Superfine. Studies by composition and methylation analyses, Smith degradation, and 1D and 2D 1H and 13C NMR spectroscopy demonstrated the presence of two structurally distinct repeating units having the following structures:It seems likely, although not proved, that these are repeats of two distinct polysaccharides rather than they build blocks within the same polysaccharide chain. The former structure is new, whereas the latter is closely related to the O-polysaccharide structure of A. brasilense Jm6B2 established earlier, which differs in partial (â¼60%) 3-O-methylation of d-rhamnose only [Boiko, A. S.; Dmitrenok, A. S.; Fedonenko, Yu. P.; Zdorovenko, E. L.; Konnova, S. A.; Knirel, Y. A.; Ignatov, V. V. Carbohydr. Res. 2012, 355, 92-95].
Related Topics
Physical Sciences and Engineering
Chemistry
Organic Chemistry
Authors
Elena N. Sigida, Yuliya P. Fedonenko, Evelina L. Zdorovenko, Svetlana A. Konnova, Alexander S. Shashkov, Vladimir V. Ignatov, Yuriy A. Knirel,