Abstract: A method for producing ?-trypsin, the method comprising: a) renaturing denatured trypsinogen, thereby producing renatured trypsinogen, wherein the renaturing is carried out in a buffer that comprises L-arginine; b) purifying the renatured trypsinogen by anion exchange chromatography, thereby providing purified renatured trypsinogen; and c) incubating the purified renatured trypsinogen under conditions to promote proteolytic activity of the trypsinogen, wherein trypsinogen is cleaved into ?-trypsin by said proteolytic activity; wherein steps a) and b) are carried out under conditions that do not promote the proteolytic activity of trypsinogen; wherein the method does not comprise the addition of a further protease for cleaving trypsinogen into ?-trypsin; wherein at least step c) is carried out in a buffer that does not comprise L-arginine; and wherein prior to step c), when present in a buffer that does not comprise L-arginine, the trypsinogen is not subjected to a temperature of >8° C.

Abstract: Described herein is a method for separating a recombinantly produced polypeptide from host cell protein. The method includes a step of loading a clarified cell culture supernatant that includes the recombinantly produced polypeptide and the HCP onto a Protein A chromatography column and washing the Protein A chromatography column with a wash buffer comprising a fatty acid having a chain length of at least about 6 carbon atoms, or a fatty acid salt thereof to remove HCP and then recovering the recombinantly produced polypeptide.

Abstract: Described herein is a method for separating a recombinantly produced polypeptide from host cell protein. The method includes a step of loading a clarified cell culture supernatant that includes the recombinantly produced polypeptide and the HCP onto a Protein A chromatography column and washing the Protein A chromatography column with a wash buffer comprising a fatty acid having a chain length of at least about 6 carbon atoms, or a fatty acid salt thereof to remove HCP and then recovering the recombinantly produced polypeptide.