Patent ID: 9676817
Date: 2017-06-13
CPC Classifications: A61L,C07K

Claim:
1. A method for selectively removing virus and/or virus DNA from an aqueous solution comprising a target protein selected from the group consisting of trypsin, chymotrypsin, chymotrypsin B, or a mixture thereof, said method comprising: a) adding acetone to the solution at a concentration which selectively precipitates the virus and/or virus DNA, wherein the concentration of acetone is 12-40% (v/v), b) performing a separation step to separate precipitated material from the solution comprising the target protein, c) adding to the solution an additional amount of acetone to reach a final concentration which precipitates the target protein, wherein the final concentration of acetone is 45-95% (v/v), and d) collecting the precipitated target protein from the solution.