Chitin-chitosan oligomer having 2,5-amhydromannitol group or 2,5

Details Chitin-chitosan oligomer having 2,5-amhydromannitol group or 2,5 Chitin-chitosan oligomer having 2,5-amhydromannitol group or 2,5

1992-07-13

1994-05-17

Wityshyn, Michael G.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carbohydrates or derivatives

536 552, 536 41, 536 21, C08B 3708, C08B 3710, C07H 504, C07G 300

Patent

active

053129083

ABSTRACT:
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##

REFERENCES:
patent: 3879376 (1975-04-01), Vanlerberahe et al.
patent: 3922260 (1975-11-01), Peniston et al.
patent: 4424346 (1984-01-01), Hall et al.
patent: 4659700 (1987-04-01), Jackson
patent: 4788307 (1988-11-01), Lormeau et al.
patent: 4804750 (1989-02-01), Nishimura et al.
Nippon, S.; Feb. 5, 1989; JA-2292301; Abstract.
F. Yaku et al., Cellulose Chemistry & Technology, II, 421-430 The Preparation of Glucosamine Oligosaccharide and Its Cu(II) Complex (1977).
Hirano et al., Carbohydrate Research, 144 (1985) 338-341, "Preparation of acetylated derivatives of modified chino-oligosaccharides by the depolymerisation of partially N-acetylated chitosan with nitrous acid"(1985).

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