Abstract: The present invention relates to the field of purification of fermentation-derived products, in particular enzymes. The invention is directed to a method for purifying a fermentation-derived solution of an enzyme of interest comprising at least the following steps: a) providing a fermentation-derived solution of an enzyme of interest comprising 0.1 to 40 g/kg sulfate and 0 to 20 g/kg phosphate; b) contacting the enzyme solution with an anion exchange resin; c) obtaining a purified enzyme solution wherein the concentration of sulfate and/or phosphate is below the concentration of sulfate and/or phosphate in step a) and wherein the purified enzyme solution has a CIELAB L-value of above 60. Moreover, the invention contemplates a solution of an enzyme of interest obtained by or obtainable by said method.