Extracellular polysaccharides produced by acetic acid bacteria. Part III. Structure of an acidic polysaccharide elaborated by Acetobacter sp. NBI 1005.

Abstract

An extracellular acidic polysaccharide elaborated by Acetobacter sp. NBI 1005 was composed of d-glucose, d-galactose, d-mannose, and d-glucuronic acid (approximate molar ratio, 6:2:1:1). Methylation and fragmentation analysis by partial acid hydrolysis indicated that the polysaccharide has a branched structure containing a backbone chain of β-(l→4)-linked d-glucose residues, two out of every four glucose residues being substituted at the O-3 positions to form two kinds of branches, one consisting of d-mannose and d-glucuronic acid residues and the other of (1→6)-linked d-galactose and d-glucose residues.