Methods of inactivating viral contaminants
The present invention relates to a method for preparing an antibody-containing solution free viral contaminants starting from cultured cells are described. The method include a step of subjecting the antibody containing solution to a mix of solvent and detergent or to high pH.
1. A method of production of a bulk drug substance comprising a therapeutic antibody, wherein the method comprises the steps of:
(a) subjecting a harvested antibody material to Protein A chromatography;
(b) incubating the resulting Protein A eluate at a high pH;
(c) neutralizing the resulting viral inactivated solution to pH 5.5, followed by 0.2 um filtration;
(d) subjecting the neutralized viral inactivated Protein A eluate to cation exchange chromatography, followed by 0.2 um filtration;
(e) concentrating the cation exchange chromatography eluate by ultrafiltration and continuous diafiltration, followed by 0.2 um filtration;
(f) purifying the product by anion exchange chromatography in flow through mode, using membrane adsorption, followed by 0.2 um filtration;
(g) removing virus by nanofiltration;
(h) concentrating the product by ultrafiltration and continuous diafiltration into pre-formulation buffer, followed by 0.2 um filtration;
(i) adding excipients to achieve about 6 mg/mL of the product in the final formulation buffer, by mixing about 5 mM L-Histidine, about 150 mM L-Arginine Monohydrochloride, about 15% Sucrose, and about 0.06% Polysorbate 80, at pH of about 6.0, followed by 0.2 um filtration; and
(j) filling the product into sterile bags, followed by freezing and storage at −80±20° C.
2. The method of claim 1 , wherein the Protein A eluate is titrated to the target high pH with NaOH.
3. The method of claim 2 , wherein the Protein A eluate is titrated with NaOH 0.5M to pH 11, for an incubation time of about 60 min at temperature between about 18° C. to about 25° C.
4. The method of claim 1 , wherein the harvested antibody material is produced in non-human mammalian cells.
5. The method of claim 1 , wherein the harvested antibody material comprises a monoclonal antibody.
6. The method of claim 5 , wherein the monoclonal antibody is a recombinant antibody.
7. The method of claim 6 , wherein the recombinant antibody is multispecific.
8. The method of claim 1 , wherein the high pH is at between about 9 and about 12.5.
9. The method of claim 8 , wherein the high pH is at least 10.5.
10. The method of claim 8 , wherein the high pH is about 11.
11. The method of claim 1 , wherein the Protein A eluate is titrated to a target high pH with a buffer selected from the group consisting of: Tris, Histidine L-Arginine phosphate and NaOH.
12. The method of claim 1 further comprising testing a portion of the virus-inactivated antibody solution with a viral inactivation assay.