| abstract |
Claim 1: Chitosan carboxyalkyl of fungal origin characterized in that it has glucosamine units, N-acetyl-glucosamine units, and glucosamine units substituted by a carboxyalkyl group, and said chitosan carboxyalkyl presents, preferably, a degree of substitution by a higher carboxyalkyl group at 20%, expressed as the number of mol of the substituent, with respect to the number of mol of total units. Claim 16: Process for preparing a composition characterized in that it comprises a carboxyalkyl chitosan defined according to any one of claims 8 to 14, and said process comprises: dissolving a carboxyalkyl chitosan defined according to any one of claims 1 to 9 in an aqueous solution, preferably water, optionally buffered, preferably at pH between 6.2 and 8.5, and preferably between 6.5 and 7.5; the eventual adjustment of the pH to a desired pH, in general to the physiological pH for the intended application, for example, by adding a buffering agent, a base or an acid; the possible addition of other excipients, such as, for example, a reducing sugar, for example, sorbitol or mannitol; the eventual adjustment of the final osmolality of the composition. |