title: Structure of polygalactosamine produced by Aspergillus parasiticus.
abstract: The structure of polygalactosamine purified from the culture fluid of Aspergillus parasiticus AHU 7165 was studied. Partial acid hydrolysis of this polysaccharide, in which 55 to 65% of the monosaccharide residues were N-unsubstituted, gave a series of galactosamine oligosaccharides (dimer to hexamer) in a good yield. From the data on analyses of the polysaccharide and its oligosaccharides by gel filtration, periodate oxidation, methylation, and proton NMR measurement, the polysaccharide was characterized as a linear chain of alpha (1-4)-linked galactosamine residues. The N-unsubstituted galactosamine residues are probably distributed in a random fashion over the polysaccharide chain.
mesh_terms: D000116:Acetylgalactosamine / Q000302:isolation & purification; D001230:Aspergillus / Q000032:analysis*; D002236:Carbohydrate Conformation; D005685:Galactans / Q000032:analysis*; D005688:Galactosamine / Q000032:analysis; D006868:Hydrolysis; D008970:Molecular Weight; D009844:Oligosaccharides / Q000302:isolation & purification
chemical_list: D005685:Galactans; D009844:Oligosaccharides; D005688:Galactosamine; C023041:poly-N-acetylgalactosamine; D000116:Acetylgalactosamine