Abstract
The extracellular, bacterial polysaccharides from seven Rhizobium strains have been submitted to partial hydrolysis with acid. Several neutral oligosaccharides, some containing pyruvic acid, were isolated together with D-glucuronic acid-containing oligosaccharides. The polysaccharide from - Rh. meliloti did not contain glucuronic acid. For the other six strains, the following components were characterized: 4- O-(β- D-glucopyranosyluronic acid)- D-glucuronic acid, 4- O-(β- D-glucopyranosyluronic acid)- D-glucose, and O-(β- D-glucopyranosyluronic acid)-(1→4)- O-(β- D glucopyranosyluronic acid)-(1→4)- D-glucose. These results indicate the presence of chains containing two β-(1→4)-linked D-glucuronic acid residues, β-linked to D-glucose at position 4.
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