Compositions and methods for reducing bioburden in chromatography

Patent metadata

Field	Value
Publication number	US-11717586-B2
Application number	US-202217848936-A
Country	US
Kind code	B2
Filing date	Jun 24, 2022
Priority date	Jan 30, 2017
Publication date	Aug 8, 2023
Grant date	Aug 8, 2023

Abstract

The invention provides methods for microbial bioburden reduction of various chromatography matrices, including bioburden reduction in the context of large-scale Protein A-based affinity chromatography columns.

First claim

The invention claimed is:

1. A method for microbial bioburden reduction of a chromatography matrix, comprising: contacting a chromatography matrix with a composition comprising from about 0.1 M to about 0.5 M acetic acid, wherein the contacting step is performed for about 1 hour to about 4 hours, wherein the composition does not comprise an alcohol, guanidine hydrochloride, or urea, and the method does not comprise a step of contacting the chromatography matrix with a sodium hydroxide solution.

2. The method of claim 1 , wherein the contacting step is performed for about 4 hours.

3. The method of claim 1 , wherein the composition comprises about 0.1 M acetic acid and the contacting step is performed for about 4 hours.

4. The method of claim 1 , wherein the composition comprises about 0.5 M acetic acid and the contacting step is performed for about 4 hours.

5. A method for microbial bioburden reduction of a chromatography matrix, comprising: contacting a chromatography matrix with a composition comprising from about 0.1 M to about 1.0 M acetic acid, wherein the contacting step is capable of one or more of a reduction in the amount of spore forming bacteria by at least 3 log 10 , a reduction in the amount of gram positive bacteria by at least 5 log 10 , and a reduction in the amount of gram negative bacteria by at least 5 log 10 in the chromatography matrix, wherein the composition does not comprise an alcohol, guanidine hydrochloride, or urea, and the method does not comprise a step of contacting the chromatography matrix with a sodium hydroxide solution.

6. The method of claim 5 , wherein the contacting step is capable of a reduction in the amount of one or more of spore forming bacteria, gram positive bacteria, and gram negative bacteria, in the chromatography matrix, to below the limit of detection as determined by an assay selected from the group consisting of (1) a biofiltration assay, (2) microscopic bacterial staining, (3) IR/FTIR spectroscopy method, (4) a sterility test, and (5) a bacterial identification test.

7. The method of claim 6 , wherein the spore forming bacteria are Bacillus pseudofirmus , the gram positive bacteria are Microbacterium spp., and the gram negative bacteria are Stenotrophomonas maltophilia.

8. The method of claim 1 , wherein the composition further comprises an acetate salt.

9. The method of claim 5 , wherein the composition further comprises an acetate salt.

10. The method of claim 1 , wherein the composition has pH between about 2 and about 3.

11. The method of claim 1 , wherein the contacting step is conducted at a temperature between 15° C. and 30° C.

12. The method of claim 11 , wherein the contacting step is conducted at a temperature between 20° C. and 25° C.

13. The method of claim 1 , wherein said chromatography matrix comprises a proteinaceous ligand coupled to a support.

14. The method of claim 5 , wherein the composition has pH between about 2 and about 3.

Assignees

• Regeneron Pharma
• Regeneran Pharmaceuticals Inc

Inventors

• Mao Nathan L
• Qi Wenbin
• Schilling Bernhard
• Carver Scott

Classifications

• B01D15/203 Primary

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