Method for preparing an aqueous solution of beta-glucan

A method for the preparation of an aqueous solution comprising at least one beta-glucan comprising:

• fermenting at least one fungal strain which secretes the at least one beta-glucan into an aqueous culture medium to obtain a fermentation broth comprising the at least one beta-glucan, the water and biomass,
• b) adding at least one acid to the fermentation broth obtained in step a) to adjust the pH to a value in the range of ≧2.0 to ≦4.0 while maintaining the temperature of the fermentation broth in the range of ≧15 to ≦55° C. and
• c) filtering the fermentation broth obtained in step b) to obtain an aqueous solution comprising the at least one beta-glucan.