Drug – bio-affecting and body treating compositions – Designated organic active ingredient containing – Carbohydrate doai
Reexamination Certificate
2006-08-29
2006-08-29
Price, Elvis Q. (Department: 1623)
Drug, bio-affecting and body treating compositions
Designated organic active ingredient containing
Carbohydrate doai
C514S054000, C536S020000, C536S018700, C536S124000
Reexamination Certificate
active
07098194
ABSTRACT:
In accordance with the present invention there is provided a new composition and method for chemically modifying chitosan, including N-substituting or N-cross-linking, under homogeneous conditions by providing neutral aqueous chitosan solutions with enhanced reactivity. The method comprises the steps of i) preparing a clear aqueous solution of chitosan, said solution comprising 0.1 to 10% by weight of a chitosan, and 0.1 to 20% by weight of at least one buffering agent having a pKa between 6.0 and 7.6, said solution having a pH ranging from 6.8 to 7.2; and ii) dissolving homogeneously at least one reagent into the solution of step a), said reagent being reactive toward amine groups of chitosan; and said reagent being at a concentration from 0.01 to 10% by weight. The chitosan in the aqueous solution is chemically modified or cross-linked by a selective substitution on the amino group of chitosan.
REFERENCES:
patent: 4424346 (1984-01-01), Hall et al.
patent: 4605623 (1986-08-01), Malette et al.
patent: 4996307 (1991-02-01), Itoi et al.
patent: 5977330 (1999-11-01), Lohmann et al.
Shimizu et al. (Nippon Kagaku Kaishi (1998), (9), 637-641) (Abstract Sent).
Hirano et al.,Biopolymers, 15, 1685, 1976, Kubota et al.,Polymer Journal; 29, 123, 1997.
Berrada Mohammed
Chaput Cyril
Chenite Abdellatif
Dabbarh Fouad
Selmani Amine
Biosyntech Canada, Inc.
Henry Michael C.
Nixon & Peabody LLP
Price Elvis Q.
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