POL Scientific / JBM / Volume 11 / Issue 2 / DOI: 10.14440/jbm.2024.0006
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RESEARCH ARTICLE

Calcium chloride and arginine show diametrically opposite effects on antibody elution in Protein A and Protein L chromatography

Ju Qu1 Yan Wan1 Yifeng Li1*
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1 Downstream Process Development, WuXi Biologics, 288 Fute Zhong Road, Waigaoqiao Free Trade Zone, Shanghai, 200131, China
JBM 2024 , 11(2), e99010016; https://doi.org/10.14440/jbm.2024.0006
Submitted: 23 May 2024 | Revised: 20 June 2024 | Accepted: 25 July 2024 | Published: 10 July 2024
© 2024 by the Journal of Biological Methods published by POL Scientific. Licensee POL Scientific, USA. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution 4.0 International License ( https://creativecommons.org/licenses/by/4.0/ )
Abstract

Protein A and Protein L affinity chromatographies are extensively used in mAb and bispecific antibody (bsAb) purification. In addition to product capture, they are both capable of separating certain product-related by-products and aggregates under appropriate conditions. For both types of chromatography, previous studies suggested that adding a salt additive to the mobile phase can significantly improve the resolution between product and by-products/aggregates. Nevertheless, the effects of different salt additives on antibody elution in Protein A and Protein L chromatography have not been compared. In the current study, we compared the effects of three salt additives, sodium chloride (NaCl), calcium chloride (CaCl2), and arginine hydrochloride (Arg·HCl), on antibody elution in Protein A and Protein L chromatography. Interestingly, while NaCl suppressed antibody elution in both types of chromatography, CaCl2, and Arg·HCl promoted antibody elution in Protein A chromatography but suppressed antibody elution in Protein L chromatography. In addition, we evaluated the effect of each salt gradient on aggregate removal by Protein L chromatography. The information provided by the current study should be useful to the selection of conditions/additives for improving by-product removal by Protein A and Protein L chromatography.

Keywords
Antibody
Arginine
Calcium chloride
Elution
Protein A
Protein L
Retention volume (time)
Salt additive
Sodium chloride
Funding
None.
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Conflict of interest
The authors declare no conflicts of interest.
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Journal of Biological Methods, Electronic ISSN: 2326-9901 Print ISSN: TBA, Published by POL Scientific