Modified chitosan polymers and enzymatic methods for the...

Details Modified chitosan polymers and enzymatic methods for the... Modified chitosan polymers and enzymatic methods for the...

2007-10-30

2007-10-30

Krass, Frederick (Department: 1614)

Drug, bio-affecting and body treating compositions

Designated organic active ingredient containing

Carbohydrate doai

C435S068100, C435S072000, C435S074000, C435S101000, C527S200000, C527S206000, C527S303000, C536S020000, C536S055100, C536S055300, C536S127000

Reexamination Certificate

active

09763324

ABSTRACT:
The present invention is directed to homogeneous phase enzyme-catalyzed processes for producing modified chitosan polymers or oligomers. An enzyme is reacted with a phenolic substrate in the presence of a chitosan polymer or oligomer to produce a modified chitosan polymer or oligomer. The invention also includes modified chitosan polymers or oligomers produced by the novel processes, in particular modified chitosan polymers or oligomers having useful functional properties, such as base solubility and/or high viscosity.

REFERENCES:
patent: 5147698 (1992-09-01), Cole
patent: 5340483 (1994-08-01), Payne et al.
patent: 5422116 (1995-06-01), Yen et al.
patent: 5474989 (1995-12-01), Hashimoto et al.
JP 09239396 A, XP-002221719, (Abstract),Derwent Publications Ltd.,Section Ch, Week 9744, AN 1997-507214, Sep. 16, 1997.
S. Wada et al., “Removal of Phenols and Aromatic Amines from Wastewater by a Combination Treatment With Tyrosinase and a Coagulant,”Biotechnology and Bioengineering,45:304-309 (1995), XP-001119098.
R. Muzzarelli et al., “Tyrosinase-mediated quinone tanning of chitinous materials,”Carbohydrate Polymers,24:295-300 (1994), XP 000645409.
G. Payne et al., “Tyrosinase Reaction/Chitosan Adsorption for Selectively Removing Phenols from Aqueous Mixtures,”Biotechnology and Bioengineering,40(9):1011-1018 (1992), XP 000306318.
English Translation of JP 9 239 396 (1997).

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