Loading patent…
AssigneeTamatsukuri Corporation
InventorEtsuko Nakao
Estimating the term…
A chitin oligosaccharide which is a chitin oligomer having a 2,5-anhydromannose group or a chitosan oligosaccharide which is a chitosan oligomer having a 2,5-anhydromannose group having a structure of the formula shown below at a terminal end: ##STR1## wherein it can be prepared by allowing chitin or chitosan to react with nitrous acid at a temperature of 10.degree. C. or lower in an aqueous solution with a hydrogen ion concentration of 1 to 6 to effect deamination reaction and pinacol rearrangement reaction, and further reducing this with a reducing agent, a chitin oligosaccharide which is a chitin oligomer having a 2,5-anhydromannitol group or a chitosan oligosaccharide which is a chitosan oligomer having a 2,5-anhydromannitol group having a structure of the formula shown below at an end: ##STR2##
A method for preparing a chitin oligomer or a chitosan oligomer having a 2,5-anhydromannitol group at a terminal end, which comprises reacting chitin or chitosan with nitrous acid at a temperature of 10.degree. C. or lower in an aqueous solution with a pH of 2 to 4 to effect a deamination reaction and pinacol rearrangement and thereby produce a chitin or chitosan oligomer having a 2,5-anhydromannose group at a terminal end, then reducing said chitin oligomer or chitosan oligomer having a 2,5-anhydromannose group at a terminal end with a reducing agent, precipitating and recovering said chitin or chitosan oligomer.
A chitin oligomer having a 2,5-anhydromannitol group at a terminal end, consisting essentially of a 2,5-anhydromannitol group of the formula:
A chitosan oligomer having a 2,5-anhydromannitol group at a terminal end, consisting essentially of a 2,5-anhydromannitol group of the formula:
Dependencies are inferred from the claim text.