PROCESS FOR PREPARING AQUEOUS SOLUTIONS AND GELS OF CHITOSAN AND ADDUCTS OF THE CHITOSAN SALT TYPE AS WELL AS CHELATE-FORMING COMPLEX-FORMING COMPOUNDS

摘要

The invention relates to a process for the preparation of aqueous solutions and gels of chitosan in which chitosan and an acidic chelating agent are dissolved in water. Such solutions can be drastically increased in viscosity or converted into highly viscous gels by adding salts of polyvalent metals and acids in which chitosan is only moderately soluble or is insoluble. From such solutions, salt-like chitosan/chelating agent adducts can be obtained by removing water or by precipitation using an organic solvent.