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Abstract

The present invention discloses a method of producing modified, derivatized chitosans which produce viscous aqueous liquids when dispersed (solublized) in compatible aqueous liquids. The method comprises reacting chitosan in an acidic solution with an aldehyde-group containing chemical modifier at an elevated temperature wherein the concentration of chitosan in the acidic solution and the reaction time at the elevated temperature are sufficient to produce a semi-solid gel. The preferred chemical modifier is one or more saccharides containing less than about 10 saccharide units, most preferably lactose. The preferred reaction temperature is greater than about 60.degree. C., and the preferred concentration of chitosan is at least about 1.43% w/v. The invention also discloses the acidic chitosan-containing concentrates prepared by the method, and the viscous acidic fluids prepared by dispersing/solubilizing the concentrates in aqueous liquids.

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First Claim