期刊
JOURNAL OF SEPARATION SCIENCE
卷 35, 期 16, 页码 2131-2137出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/jssc.201200282
关键词
Adsorption isotherm; Adsorption kinetics; Bovine immunoglobulin; Ion exchange chromatography; Ligand density; Pore size
资金
- National Natural Science Foundation of China
- Program for New Century Excellent Talents in University (NCET)
- Zhejiang Provincial Natural Science Foundation of China
Immunoglobulin G is an important plasma protein with many applications in therapeutics and diagnostics, which can be purified effectively by ion exchange chromatography. The ligand densities and pore properties of ion-exchange resins have significant effects on the separation behaviors of protein, however, the understandings are quite limited. In this work, with bovine immunoglobulin as the model IgG, the adsorption isotherms and adsorption kinetics were investigated systematically with series of diethylaminoethyl ion-exchange resins with different ligand densities and pore sizes. The Langmuir equation and pore diffusion model were used to fit the experimental data. The influences of ligand density and pore size on the saturated adsorption capacity, the dissociation constant and the effective diffusivity were discussed. The adsorption capacities increased with the increase of ligand density and the decrease of pore size, and an integrative parameter was proposed to describe the combined effects of ligand density and pore size. It was also found that the effective pore diffusion coefficient of the adsorption kinetics was influenced by pore sizes of resins, but was relatively independent on the ligand densities of resins. For a given protein, the ligand density and pore size should be optimized for improving the protein adsorption.
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