期刊
JOURNAL OF CHROMATOGRAPHY A
卷 1418, 期 -, 页码 119-129出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chroma.2015.09.053
关键词
Linear pH gradient elution; Solvent modulation; Monoclonal antibodies; Bispecific antibodies; Product-related impurities
资金
- Albert und Anneliese Konanz Foundation
Classical ion-exchange chromatography using a linear salt gradient to elute the adsorbed protein at fixed pH is the most common method to separate product-related impurities during downstream processing of biopharmaceuticals. Linear pH gradient elution provides a useful alternative by, separating proteins in a linear pH gradient at fixed salt concentration. Although linear pH gradient elution provides excellent selectivity, it is rarely encountered in industrial purification processes. Here, a stoichiometric displacement model is used to characterize pH gradient elution based on simple linear gradient elution experiments. Protein retention behavior is described with respect to the pH dependencies of the characteristic binding charge and the equilibrium constant of the ion exchange reaction. Furthermore, the influence of solvent composition using PEG as a mobile phase modifier is investigated. Validity and applicability of the model are demonstrated for the purification of a conventional monoclonal antibody from soluble aggregates and for a novel bispecific antibody format containing a unique product-related impurity profile. pH step elution protocols are derived from model calculations without further optimization experiments necessary. (C) 2015 Elsevier B.V. All rights reserved.
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