The invention relates to a method of preparing a composition, the composition comprising a crosslinked first polymer, optionally a second polymer, which may be crosslinked or non-crosslinked, and water, wherein the first and the second polymer are selected from a polysaccharide, comprising at least steps (i) to (iv): (i) crosslinking a mixture comprising the first polymer and water； (ii) subsequent to the crosslinking in step (i), terminating the crosslinking； (iii) optionally blending the product obtained in step (ii) with the second polymer； (iv) subjecting the product obtained in step (iii) to dialysis.
