Abstract
Two types of neutral O-polysaccharides were obtained by mild acid degradation of the lipopolysaccharide isolated by phenol–water extraction from the asymbiotic diazotrophic rhizobacterium Azospirillum brasilense Jm6B2. The following structure of the major O-polysaccharide was established by composition and methylation (ethylation) analyses, Smith degradation, and 1D and 2D 1H and 13C NMR spectroscopy: [Display omitted] where a non-stoichiometric (∼60%) 3-O-methylation of d-rhamnose is indicated by italics.
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