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1. (Article ID: 2201)
 
Likhosherstov LM, Senchenkova SN, Shashkov AS, Derevitskaya VA, Danilova IV, Botvinko IV
Structure of the major exopolysaccharide produced by Azotobacter beijerinckii B-1615
Carbohydrate Research 222 (1991) 233-238
 

A. beijerinckii strain B-1615 produced two acidic exopolysaccharides in the ratio approximately 9:1. The minor polysaccharide contained mannuronic and guluronic acids in the ratio 2.3:1 and is a bacterial alginate. The major polysaccharide consisted of D-galactose, L-rhamnose, and pyruvic acid in the ratios 2:1:1 and was acetylated. On the basis of methylation analysis, and 1H- and 13C-n.m.r. spectroscopy of the polysaccharide before and after removal of the pyruvic acid residues and O-deacetylation, it was concluded that the major polysaccharide had the structure [formula; see text] with up to 1.5 OAc groups per repeating unit.

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2. (Article ID: 4437)
 
Ogawa K, Yui T, Nakata K, Kakuta M, Misaki A
X-Ray study of beijeran sodium salts, a new galacturonic acid-containing exo-polysaccharide
Carbohydrate Research 300(1) (1997) 41-45
 

X-Ray fiber diffraction patterns were obtained from oriented films of sodium salts of a new uronic acid-containing polysaccharide (beijeran) both in its native, poly [→3)-α-D-GalA-(1→3)-β-L-Rha-(1→3)-α-D-Glc-O6Ac-(1→], and deacetylated forms. Initially the stretched films of both polysaccharides were amorphous, but the crystallinity was much improved by annealing at high temperature. The deacetylated specimen had higher crystallinity than the native. Both films showed similar X-ray fiber patterns indicating that these polysaccharides had similar unit cell dimensions and that the O-acetyl groups in the native beijeran chain did not disturb the regular array in the crystal having space group P21. All the visible reflections could be indexed in terms of a monoclinic unit cell with dimensions a = 1.277, b = 1.611, c (fiber axis) = 2.437 nm, and γ = 96.79 degrees. The fiber axis length and the presence of (002) and (006) reflections indicated that the conformation was made up of two trisaccharide residues, in an extended two-fold helix.

Beijeran, Chain conformation, Fiber diffraction pattern, Unit cell parameters

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