1
|
Ding C, Gerberich C, Ierapetritou M. Hybrid model development for parameter estimation and process optimization of hydrophobic interaction chromatography. J Chromatogr A 2023; 1703:464113. [PMID: 37267655 DOI: 10.1016/j.chroma.2023.464113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2023] [Revised: 05/26/2023] [Accepted: 05/27/2023] [Indexed: 06/04/2023]
Abstract
Hydrophobic Interaction Chromatography (HIC) is often employed as a polishing step to remove aggregates for the purification of therapeutic proteins in the biopharmaceutical industry. To accelerate the process development and save the costs of performing time- and resource-intensive experiments, advanced model-based process design and optimization are necessary. Due to the unclear adsorption mechanism of the salt-dependent interaction between the protein and resin, the development of an accurate mechanistic model to describe the complex HIC behavior is challenging. In this work, an isotherm derived from Wang et al. is modified by adding three extra parameters together with an equilibrium dispersive model to represent the HIC process. To reduce the development effort of isotherm equations and extract missing information from the available data, a hybrid model is constructed by combining a simple and well-known multi-component Langmuir isotherm (MCL) with a neural network (NN). It is observed that the structure of the hybrid model is of critical importance to the accuracy of the developed model. During parameter estimation, a regularization strategy is incorporated to prevent overfitting. Furthermore, the impact of NN structures and regularization rates are comprehensively investigated. One of the interesting findings was that a simple NN with one hidden layer with two nodes and sigmoid as the activation function, significantly outperforms the mechanistic model, with a 62% improvement in accuracy in calibration and 31.4% in validation. To ensure the generalizability of the developed hybrid model, an in-silico dataset is generated using the mechanistic model to test the extrapolation capability of the hybrid model. Process optimization is also carried out to find the optimal operating conditions under product quality constraints using the developed hybrid model.
Collapse
Affiliation(s)
- Chaoying Ding
- Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, DE 19716, USA
| | - Christopher Gerberich
- Biopharm Drug Substance Process Development, GlaxoSmithKline, King of Prussia, PA 19406, USA
| | - Marianthi Ierapetritou
- Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, DE 19716, USA.
| |
Collapse
|
2
|
Shekhawat LK, Markle T, Esfandiarfard K, Theel EK, Maloisel JL, Malmquist G. Next generation multimodal chromatography resins via an iterative mapping approach: Chemical diversity, high-throughput screening, and chromatographic modelling. J Chromatogr A 2023; 1699:464018. [PMID: 37119712 DOI: 10.1016/j.chroma.2023.464018] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Revised: 04/18/2023] [Accepted: 04/21/2023] [Indexed: 05/01/2023]
Abstract
Multimodal chromatography resins are becoming a key tool in the purification of biomolecules. The main objective of this research was the establishment of an iterative framework for the rapid development of new multimodal resins to provide novel selectivity for the future purification challenges. A large chemically diverse virtual library of 100 multimodal Capto™ MMC ligand analogues was created, and a broad array of chemical descriptors were calculated for each ligand in silico. Principal component analysis (PCA) was used to map the chemical diversity and guide selection of ligands for synthesis and coupling to the Capto ImpRes agarose base matrix. Twelve new ligands were prepared in two groups: 'group one' consist of L00-L07 and 'group two' consist of L08-L12. These ligands are diverse in the influence of varied secondary interactions such as hydrophobic interactions, H-bonding, etc. Additional resin prototypes were also prepared to look at the chromatographic impact of ligand density variation. High-throughput plate-based studies were performed for parallel resin screening for batch-binding of six model proteins at different chromatographic binding pH and sodium chloride concentration conditions. Principal component analysis of the binding data provided a chromatographic diversity map leading to the identification of ligands with improved binding. Further, the new ligands have improved separation resolution between a monoclonal antibody (mAb1) and product related impurities, a Fab fragment and high molecular weight (HMW) aggregates, using linear salt gradient elutions. To quantify the importance of secondary interactions, analysis of the retention factor of mAb1 on the ligands at various isocratic conditions lead to estimations of (a) the total number of water molecules and counter salt ions released during adsorption, and (b) hydrophobic contact area (HCA). The iterative mapping approach of chemical and chromatography diversity maps described in the paper proves to be a promising method for identifying new chromatography ligands for biopharmaceutical purification challenges.
Collapse
Affiliation(s)
| | - Todd Markle
- Cytiva Sweden AB, Björkgatan 30, Uppsala, Sweden
| | | | | | | | | |
Collapse
|
3
|
Fuchs T, Pälchen A, Jupke A. Influence of Mixed Salts on Retention Behavior of Model Proteins in Cation Exchange Chromatography. J Chromatogr A 2023; 1696:463968. [PMID: 37054639 DOI: 10.1016/j.chroma.2023.463968] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2023] [Revised: 04/04/2023] [Accepted: 04/04/2023] [Indexed: 04/08/2023]
Abstract
Mobile phase composition is an important factor for a further improvement of ion exchange chromatography steps of proteins. In this work, the effects of mixed salts on the retention factors of the two model proteins lysozyme (LYZ) and bovine serum albumin (BSA) in cation exchange chromatography (CEC) were investigated and compared to effects previously observed in hydrophobic interaction chromatography (HIC). The model equation describing the effects in HIC was adjusted for linear gradient elution experiments in CEC. The investigated salts were sodium chloride, sodium sulfate, ammonium chloride and ammonium sulfate. By varying binary salt mixtures as well as using pure salts, model parameters were determined. The normalized root mean square error (NRMSE) of the predicted retention factors for the calibration runs was 4.1% for BSA and 3.1% for LYZ. Additional validation experiments proved the ability of the model to describe and predict retention behavior of the proteins for further salt compositions. Hereby, the NRMSE values for BSA and LYZ were 2.0% and 1.5%, respectively. While the retention factors of LYZ changed linearly with the salt composition, non-linearities in the impact of the anion composition were found for BSA. This was contributed to an overlay of a synergetic salt effect on a protein-specific effect by sulfate on BSA with non-specific effects of the ions for CEC. However, the impact of the synergetic effects on protein separation is lower for CEC than for HIC, as mixed salts do not increase the separation of these proteins. The best salt composition for separating BSA and LYZ is pure ammonium sulfate. Thus, synergetic salt effects can also occur in CEC, but they have a lower impact than in HIC.
Collapse
Affiliation(s)
- Thomas Fuchs
- Fluid Process Engineering (AVT.FVT), RWTH Aachen University, Forckenbeckstr. 51, Aachen 52074, Germany.
| | - Alina Pälchen
- Fluid Process Engineering (AVT.FVT), RWTH Aachen University, Forckenbeckstr. 51, Aachen 52074, Germany
| | - Andreas Jupke
- Fluid Process Engineering (AVT.FVT), RWTH Aachen University, Forckenbeckstr. 51, Aachen 52074, Germany
| |
Collapse
|
4
|
Kreusser J, Jirasek F, Hasse H. Influence of pH value and salts on the adsorption of lysozyme in mixed-mode chromatography. Eng Life Sci 2021; 21:753-768. [PMID: 34764827 PMCID: PMC8576077 DOI: 10.1002/elsc.202100058] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Revised: 06/22/2021] [Accepted: 07/22/2021] [Indexed: 11/22/2022] Open
Abstract
Mixed-mode chromatography (MMC) is an interesting technique for challenging protein separation processes which typically combines adsorption mechanisms of ion exchange (IEC) and hydrophobic interaction chromatography (HIC). Adsorption equilibria in MMC depend on multiple parameters but systematic studies on their influence are scarce. In the present work, the influence of the pH value and ionic strengths up to 3000 mM of four technically relevant salts (sodium chloride, sodium sulfate, ammonium chloride, and ammonium sulfate) on the lysozyme adsorption on the mixed-mode resin Toyopearl MX-Trp-650M was studied systematically at 25℃. Equilibrium adsorption isotherms at pH 5.0 and 6.0 were measured and compared to experimental data at pH 7.0 from previous work. For all pH values, an exponential decay of the lysozyme loading with increasing ionic strength was observed. The influence of the pH value was found to depend significantly on the ionic strength with the strongest influence at low ionic strengths where increasing pH values lead to decreasing lysozyme loadings. Furthermore, a mathematical model that describes the influence of salts and the pH value on the adsorption of lysozyme in MMC is presented. The model enables predicting adsorption isotherms of lysozyme on Toyopearl MX-Trp-650M for a broad range of technically relevant conditions.
Collapse
Affiliation(s)
- Jannette Kreusser
- Laboratory of Engineering Thermodynamics (LTD)TU KaiserslauternKaiserslauternGermany
| | - Fabian Jirasek
- Laboratory of Engineering Thermodynamics (LTD)TU KaiserslauternKaiserslauternGermany
| | - Hans Hasse
- Laboratory of Engineering Thermodynamics (LTD)TU KaiserslauternKaiserslauternGermany
| |
Collapse
|
5
|
Prediction of the elution profiles of proteins in mixed salt systems in hydrophobic interaction chromatography. Sep Purif Technol 2020. [DOI: 10.1016/j.seppur.2019.116006] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
|
6
|
Fang YM, Chen SG, Lin DQ, Yao SJ. A new tetrapeptide biomimetic chromatographic resin for antibody separation with high adsorption capacity and selectivity. J Chromatogr A 2019; 1604:460474. [DOI: 10.1016/j.chroma.2019.460474] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2019] [Revised: 08/16/2019] [Accepted: 08/21/2019] [Indexed: 01/03/2023]
|
7
|
Silva-Santos AR, Alves CP, Monteiro G, Azevedo AM, Prazeres DMF. Multimodal chromatography of supercoiled minicircles: A closer look into DNA-ligand interactions. Sep Purif Technol 2019. [DOI: 10.1016/j.seppur.2018.11.015] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
|
8
|
Chen TH, Yang Y, Zhang Z, Fu C, Zhang Q, Williams JD, Wirth MJ. Native Reversed-Phase Liquid Chromatography: A Technique for LCMS of Intact Antibody-Drug Conjugates. Anal Chem 2019; 91:2805-2812. [PMID: 30661356 PMCID: PMC6727645 DOI: 10.1021/acs.analchem.8b04699] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The synthesis of antibody-drug conjugates (ADCs) using the interchain cysteines of the antibody inherently gives a mixture of proteins with varying drug-to-antibody ratio. The drug distribution profiles of ADCs are routinely characterized by hydrophobic interaction chromatography (HIC). Because HIC is not in-line compatible with mass spectrometry (MS) due to the high salt levels, it is laborious to identify the constituents of HIC peaks. An MS-compatible alternative to HIC is reported here: native reversed phase liquid chromatography (nRPLC). This novel technique employs a mobile phase 50 mM ammonium acetate for high sensitivity in MS and elution with a gradient of water/isopropanol. The key to the enhancement is a bonded phase giving weaker drug-surface interactions compared to the noncovalent interactions holding the antibody-drug conjugates together. The hydrophobicity of the bonded phase is varied, and the least hydrophobic bonded phase in the series, poly(methyl methacrylate), is found to resolve the intact constituents of a model ADC (Ab095-PZ) and a commercial ADC (brentuximab vedotin) under the MS-compatible conditions. The nRPLC-MS data show that all species, ranging from drug-to-antibody ratios of 1 to 8, remained intact in the column. Another desired advantage of the nRPLC is the ability of resolving multiple positional isomers of ADC that are not well-resolved in other chromatographic modes. This supports the premise that lower hydrophobicity of the bonded phase is the key to enabling online nRPLC-MS analysis of antibody-drug conjugates.
Collapse
Affiliation(s)
- Tse-Hong Chen
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United States
| | - Yun Yang
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United States
| | - Zhaorui Zhang
- Process Analytical Chemistry, AbbVie, Inc. 1 N. Waukegan Road, North Chicago, Illinois 60064, United States
| | - Cexiong Fu
- Process Analytical Chemistry, AbbVie, Inc. 1 N. Waukegan Road, North Chicago, Illinois 60064, United States
| | - Qunying Zhang
- Process Analytical Chemistry, AbbVie, Inc. 1 N. Waukegan Road, North Chicago, Illinois 60064, United States
| | - Jon D. Williams
- Discovery Structural Chemistry, AbbVie, Inc. 1 N. Waukegan Road, North Chicago, Illinois 60064, United States
| | - Mary J. Wirth
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United States
| |
Collapse
|
9
|
Hackemann E, Hasse H. Mathematical modeling of adsorption isotherms in mixed salt systems in hydrophobic interaction chromatography. Biotechnol Prog 2018; 34:1251-1260. [DOI: 10.1002/btpr.2683] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2018] [Revised: 04/29/2018] [Accepted: 06/13/2018] [Indexed: 11/06/2022]
Affiliation(s)
- Eva Hackemann
- Laboratory of Engineering Thermodynamics (LTD)University of Kaiserslautern Kaiserslautern Germany
| | - Hans Hasse
- Laboratory of Engineering Thermodynamics (LTD)University of Kaiserslautern Kaiserslautern Germany
| |
Collapse
|
10
|
Influence of mixed electrolytes on the adsorption of lysozyme, PEG, and PEGylated lysozyme on a hydrophobic interaction chromatography resin. Biotechnol Prog 2017; 33:1104-1115. [DOI: 10.1002/btpr.2474] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Revised: 03/23/2017] [Indexed: 11/07/2022]
|
11
|
Baca M, De Vos J, Bruylants G, Bartik K, Liu X, Cook K, Eeltink S. A comprehensive study to protein retention in hydrophobic interaction chromatography. J Chromatogr B Analyt Technol Biomed Life Sci 2016; 1032:182-188. [DOI: 10.1016/j.jchromb.2016.05.012] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2016] [Revised: 05/06/2016] [Accepted: 05/09/2016] [Indexed: 11/27/2022]
|
12
|
Mirani MR, Rahimpour F. Thermodynamic modelling of hydrophobic interaction chromatography of biomolecules in the presence of salt. J Chromatogr A 2015; 1422:170-177. [DOI: 10.1016/j.chroma.2015.10.019] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2015] [Revised: 10/08/2015] [Accepted: 10/08/2015] [Indexed: 10/22/2022]
|
13
|
Combined effects of potassium chloride and ethanol as mobile phase modulators on hydrophobic interaction and reversed-phase chromatography of three insulin variants. J Chromatogr A 2015; 1381:64-73. [PMID: 25595534 DOI: 10.1016/j.chroma.2014.12.081] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2014] [Revised: 12/22/2014] [Accepted: 12/26/2014] [Indexed: 11/20/2022]
Abstract
The two main chromatographic modes based on hydrophobicity, hydrophobic interaction chromatography (HIC) and reversed-phase chromatography (RPC), are widely used for both analytical and preparative chromatography of proteins in the pharmaceutical industry. Despite the extensive application of these separation methods, and the vast amount of studies performed on HIC and RPC over the decades, the underlying phenomena remain elusive. As part of a systematic study of the influence of mobile phase modulators in hydrophobicity-based chromatography, we have investigated the effects of both KCl and ethanol on the retention of three insulin variants on two HIC adsorbents and two RPC adsorbents. The focus was on the linear adsorption range, separating the modulator effects from the capacity effects, but some complementary experiments at higher load were included to further investigate observed phenomena. The results show that the modulators have the same effect on the two RPC adsorbents in the linear range, indicating that the modulator concentration only affects the activity of the solute in the mobile phase, and not that of the solute-ligand complex, or that of the ligand. Unfortunately, the HIC adsorbents did not show the same behavior. However, the insulin variants displayed a strong tendency toward self-association on both HIC adsorbents; on one in particular. Since this causes peak fronting, the retention is affected, and this could probably explain the lack of congruity. This conclusion was supported by the results from the non-linear range experiments which were indicative of double-layer adsorption on the HIC adsorbents, while the RPC adsorbents gave the anticipated increased tailing at higher load.
Collapse
|
14
|
Chai DS, Sun Y, Wang XN, Shi QH. Improved purification of immunoglobulin G from plasma by mixed-mode chromatography. J Sep Sci 2014; 37:3461-72. [DOI: 10.1002/jssc.201400554] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2014] [Revised: 09/03/2014] [Accepted: 09/08/2014] [Indexed: 11/11/2022]
Affiliation(s)
- Dong-Sheng Chai
- Department of Biochemical Engineering; Key Laboratory of Systems Bioengineering; School of Chemical Engineering and Technology; Tianjin University; Tianjin China
| | - Yan Sun
- Department of Biochemical Engineering; Key Laboratory of Systems Bioengineering; School of Chemical Engineering and Technology; Tianjin University; Tianjin China
- Collaborative Innovation Centre of Chemical Science and Engineering; Tianjin China
| | - Xiao-Ning Wang
- Vaccines Research Department 3; Beijing Tiantan Biological Products Co. Ltd; Beijing China
| | - Qing-Hong Shi
- Department of Biochemical Engineering; Key Laboratory of Systems Bioengineering; School of Chemical Engineering and Technology; Tianjin University; Tianjin China
- Collaborative Innovation Centre of Chemical Science and Engineering; Tianjin China
| |
Collapse
|
15
|
Yan J, Zhang QL, Lin DQ, Yao SJ. Protein adsorption behavior and immunoglobulin separation with a mixed-mode resin based on p
-aminohippuric acid. J Sep Sci 2014; 37:2474-80. [DOI: 10.1002/jssc.201400520] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2014] [Revised: 06/18/2014] [Accepted: 06/20/2014] [Indexed: 11/07/2022]
Affiliation(s)
- Jun Yan
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, Department of Chemical and Biological Engineering; Zhejiang University; Hangzhou China
| | - Qi-Lei Zhang
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, Department of Chemical and Biological Engineering; Zhejiang University; Hangzhou China
| | - Dong-Qiang Lin
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, Department of Chemical and Biological Engineering; Zhejiang University; Hangzhou China
| | - Shan-Jing Yao
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, Department of Chemical and Biological Engineering; Zhejiang University; Hangzhou China
| |
Collapse
|
16
|
Vajda J, Mueller E, Bahret E. Dual salt mixtures in mixed mode chromatography with an immobilized tryptophan ligand influence the removal of aggregated monoclonal antibodies. Biotechnol J 2014; 9:555-65. [DOI: 10.1002/biot.201300230] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2013] [Revised: 11/29/2013] [Accepted: 12/09/2013] [Indexed: 11/11/2022]
|
17
|
Mohammad AW, Johar S, Jahim JM, Hassan O. Optimization of Cutinase Purification using a Hydrophobic Interaction Membrane Chromatographic Process by Response Surface Methodology. SEP SCI TECHNOL 2013. [DOI: 10.1080/01496395.2013.788520] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
18
|
Glyphosate’s Suppression of Cytochrome P450 Enzymes and Amino Acid Biosynthesis by the Gut Microbiome: Pathways to Modern Diseases. ENTROPY 2013. [DOI: 10.3390/e15041416] [Citation(s) in RCA: 126] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
|
19
|
Vagenende V, Han AX, Mueller M, Trout BL. Protein-associated cation clusters in aqueous arginine solutions and their effects on protein stability and size. ACS Chem Biol 2013; 8:416-22. [PMID: 23138654 DOI: 10.1021/cb300440x] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Arginine is one of the most prominent residues in protein interactions, and arginine hydrochloride is widely used as an additive in protein solutions because of its exceptional effects on protein association and folding. The molecular origins of arginine effects on protein processes remain, however, controversial, and little is known about the molecular interactions between arginine cations and protein surfaces in aqueous arginine solutions. In this study, we report a unique biochemical phenomenon whereby clusters of arginine cations (Arg(+)) are associated with a protein surface. The formation of protein-associated Arg(+) clusters is initiated by Arg(+) ions that associate with specific protein surface loci through cooperative interactions with protein guanidinium and carboxyl groups. Molecular dynamics simulations indicate that protein-associated Arg(+) ions subsequently attract other Arg(+) ions and form dynamic cation clusters that extend further than 10 Å from the protein surface. The effects of arginine on the thermal stability and size of lysozyme and ovalbumin are measured over a wide concentration range (0 to 2 M), and we find that the formation of protein-associated Arg(+) clusters consistently explains the complex effects of arginine on protein stability and size. This study elucidates the molecular mechanisms and implications of cluster formation of Arg(+) ions at a protein surface, and the findings of this study may be used to manipulate synthetic and biological systems through arginine-derived groups.
Collapse
Affiliation(s)
- Vincent Vagenende
- Bioprocessing Technology
Institute, A*STAR (Agency for Science, Technology and Research), 20 Biopolis Way #06-01 Centros, 138668 Singapore
| | - Alvin X. Han
- Bioprocessing Technology
Institute, A*STAR (Agency for Science, Technology and Research), 20 Biopolis Way #06-01 Centros, 138668 Singapore
| | - Monika Mueller
- Bioprocessing Technology
Institute, A*STAR (Agency for Science, Technology and Research), 20 Biopolis Way #06-01 Centros, 138668 Singapore
| | - Bernhardt L. Trout
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts
Avenue, Cambridge, E19-502b, Massachusetts 02139, United States
| |
Collapse
|
20
|
Hahn R. Methods for characterization of biochromatography media. J Sep Sci 2012; 35:3001-32. [DOI: 10.1002/jssc.201200770] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2012] [Revised: 08/22/2012] [Accepted: 08/23/2012] [Indexed: 11/11/2022]
Affiliation(s)
- Rainer Hahn
- Department of Biotechnology; University of Natural Resources and Life Sciences; Vienna Austria
- Austrian Centre of Industrial Biotechnology; Vienna Austria
| |
Collapse
|
21
|
Enhancing IgG purification from serum albumin containing feedstock with hydrophobic charge-induction chromatography. J Chromatogr A 2012; 1244:116-22. [DOI: 10.1016/j.chroma.2012.04.073] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2012] [Revised: 04/25/2012] [Accepted: 04/26/2012] [Indexed: 11/21/2022]
|
22
|
Gajdosik MS, Clifton J, Josic D. Sample displacement chromatography as a method for purification of proteins and peptides from complex mixtures. J Chromatogr A 2012; 1239:1-9. [PMID: 22520159 PMCID: PMC3340482 DOI: 10.1016/j.chroma.2012.03.046] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2011] [Revised: 03/13/2012] [Accepted: 03/14/2012] [Indexed: 01/06/2023]
Abstract
Sample displacement chromatography (SDC) in reversed-phase and ion-exchange modes was introduced approximately twenty years ago. This method takes advantage of relative binding affinities of components in a sample mixture. During loading, there is a competition among different sample components for the sorption on the surface of the stationary phase. SDC was first used for the preparative purification of proteins. Later, it was demonstrated that this kind of chromatography can also be performed in ion-exchange, affinity and hydrophobic-interaction mode. It has also been shown that SDC can be performed on monoliths and membrane-based supports in both analytical and preparative scale. Recently, SDC in ion-exchange and hydrophobic interaction mode was also employed successfully for the removal of trace proteins from monoclonal antibody preparations and for the enrichment of low abundance proteins from human plasma. In this review, the principals of SDC are introduced, and the potential for separation of proteins and peptides in micro-analytical, analytical and preparative scale is discussed.
Collapse
Affiliation(s)
| | - James Clifton
- Department of Molecular Pharmacology, Physiology and Biotechnology, Brown University, Providence, RI, USA
| | - Djuro Josic
- COBRE Center for Cancer Research Development, Rhode Island Hospital and Brown University, Providence, RI, USA
- Department of Biotechnology, University of Rijeka, 51000 Rijeka, Croatia
| |
Collapse
|
23
|
Nagrath D, Xia F, Cramer SM. Characterization and modeling of nonlinear hydrophobic interaction chromatographic systems. J Chromatogr A 2011; 1218:1219-26. [DOI: 10.1016/j.chroma.2010.12.111] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2010] [Revised: 12/24/2010] [Accepted: 12/31/2010] [Indexed: 11/16/2022]
|
24
|
Zhang L, Zhao G, Sun Y. Molecular Insight into Protein Conformational Transition in Hydrophobic Charge Induction Chromatography: A Molecular Dynamics Simulation. J Phys Chem B 2009; 113:6873-80. [DOI: 10.1021/jp809754k] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Lin Zhang
- Department of Biochemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Guofeng Zhao
- Department of Biochemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Yan Sun
- Department of Biochemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| |
Collapse
|
25
|
Lienqueo ME, Shene C, Asenjo J. Optimization of hydrophobic interaction chromatography using a mathematical model of elution curves of a protein mixture. J Mol Recognit 2009; 22:110-20. [DOI: 10.1002/jmr.927] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
26
|
Zhao G, Peng G, Li F, Shi Q, Sun Y. 5-Aminoindole, a new ligand for hydrophobic charge induction chromatography. J Chromatogr A 2008; 1211:90-8. [DOI: 10.1016/j.chroma.2008.09.108] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2008] [Revised: 09/16/2008] [Accepted: 09/29/2008] [Indexed: 10/21/2022]
|
27
|
|
28
|
Patch controlled protein adsorption in mixed-mode chromatography with benzylamine as functional ligand. Biochem Eng J 2008. [DOI: 10.1016/j.bej.2007.07.024] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
29
|
Evans DRH, Macniven RP, Labanca M, Walker J, Notarnicola SM. Purification of an Fc-fusion biologic: Clearance of multiple product related impurities by hydrophobic interaction chromatography. J Chromatogr A 2008; 1177:265-71. [PMID: 17692855 DOI: 10.1016/j.chroma.2007.07.049] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2007] [Revised: 07/19/2007] [Accepted: 07/24/2007] [Indexed: 11/20/2022]
Abstract
An hydrophobic interaction chromatography step was developed for the large-scale production of an Fc-fusion biologic. Two abundant product-related impurities were separated from the active monomer using a Butyl resin and a simple step-wash and step-elution strategy. Capacity and resolution of the HIC step was optimal when sodium sulfate was employed as the lyotropic salt and pore size of the Butyl resin was 750A. Factorial analysis identified critical parameters for the Butyl chromatography and an operating window capable of delivering high product quality and yield over a broad column loading range.
Collapse
Affiliation(s)
- David R H Evans
- Biogen Idec Corporation, Bioprocess Development, 14 Cambridge Center, Cambridge, MA 02142, USA.
| | | | | | | | | |
Collapse
|
30
|
Chen J, Yang T, Luo Q, Breneman CM, Cramer SM. Investigation of protein retention in hydrophobic interaction chromatographic (HIC) systems using the preferential interaction theory and quantitative structure property relationship models. REACT FUNCT POLYM 2007. [DOI: 10.1016/j.reactfunctpolym.2007.07.029] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
31
|
Chen J, Cramer SM. Protein adsorption isotherm behavior in hydrophobic interaction chromatography. J Chromatogr A 2007; 1165:67-77. [PMID: 17698076 DOI: 10.1016/j.chroma.2007.07.038] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2007] [Revised: 07/18/2007] [Accepted: 07/20/2007] [Indexed: 10/23/2022]
Abstract
The adsorption behavior of proteins in hydrophobic interaction chromatography (HIC) was evaluated by determining the isotherms of a wide range of proteins on various HIC resin systems. Parallel batch experiments were carried out with eleven proteins on three hydrophobic resins with different ligand chemistries and densities. The effects of salt concentration, resin chemistry and protein properties on the isotherms were also examined. The resulting isotherms exhibited unique patterns of adsorption behaviors. For certain protein-resin combinations, a "critical salt behavior" was observed where the amount of protein bound to the resin increased significantly above this salt concentration. Proteins that exhibited this behavior tended to be relatively large with more solvent accessible hydrophobic surface area. Further, calculations indicated that under these conditions the occupied surface area of the adsorbed protein layer could exceed the accessible surface area. The establishment of unique classes of adsorption behavior may shed light on our understanding of the behavior of proteins in HIC systems.
Collapse
Affiliation(s)
- Jie Chen
- Department of Chemical and Biological Engineering, RPI, NY 12180, USA.
| | | |
Collapse
|
32
|
Yang T, Malmquist G, Johansson BL, Maloisel JL, Cramer S. Evaluation of multi-modal high salt binding ion exchange materials. J Chromatogr A 2007; 1157:171-7. [PMID: 17537448 DOI: 10.1016/j.chroma.2007.04.070] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2006] [Revised: 04/23/2007] [Accepted: 04/25/2007] [Indexed: 10/23/2022]
Abstract
The performance and selectivity of novel cation and anion exchange multi-modal chromatographic materials were evaluated. Desorption profiles of 13 proteins possessing a range of properties (e.g. size, charge and hydrophobicity) were determined on the cation exchange materials. Batch experiments were carried out by loading individual proteins on each resin at low salt, and examining the desorption of the proteins during sequential washes with increasing salt concentrations. While all of the resins exhibited some binding of proteins at elevated salt concentrations, this effect was more pronounced on the resins with aromatic ligands as compared to the materials with aliphatic ligands. As expected, materials with higher ionic capacities exhibited higher binding at elevated salts. In addition, some proteins exhibited high binding at elevated salt concentrations to all of the resins. The combined effect of charge and other secondary interactions with these multi-modal chromatographic materials enables high salt binding of a range of proteins as well as unique selectivities for the recovery of certain classes of proteins. Since the anion exchange materials all exhibited high binding at elevated salt concentrations the work with these materials focused on a study of elution strategies to remove proteins from these aromatic based materials. After evaluating various elution protocols, a combined strategy of pH change and chaotropic salt were shown to minimize electrostatic and hydrophobic interactions and was found to be an effective elution strategy for this class of anion exchange materials using peanut lectin as a model protein.
Collapse
Affiliation(s)
- Ting Yang
- Department of Chemical and Biological Engineering, Rensselaer Polytechnic Institute, Troy, NY, USA
| | | | | | | | | |
Collapse
|
33
|
Mahn A, Lienqueo ME, Asenjo JA. Optimal operation conditions for protein separation in hydrophobic interaction chromatography. J Chromatogr B Analyt Technol Biomed Life Sci 2007; 849:236-42. [PMID: 17027350 DOI: 10.1016/j.jchromb.2006.09.013] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2006] [Revised: 09/05/2006] [Accepted: 09/08/2006] [Indexed: 10/24/2022]
Abstract
Protein retention in hydrophobic interaction chromatography is determined by protein physicochemical properties and by system characteristics. In this paper we present an attempt to determine the optimal operation conditions that would allow the separation of binary protein mixtures. The statistically significant system variables were determined, and then empirical models were obtained which explained more than 92% of variability in dimensionless retention time based on salt properties, ionic strength of the initial eluent and substitution degree of the resin. These variables were optimized in order to achieve the maximum retention time difference between two proteins in a mixture. The optimum operation conditions as predicted by the models were tested experimentally, showing a good agreement with predicted separation. We concluded that it would be possible to determine the system conditions that allow the maximum separation of two proteins based on the main system properties. The methodology proposed here presents potential to be applied to partially characterized systems, however, it could be improved if protein's properties were included explicitly in the models.
Collapse
Affiliation(s)
- Andrea Mahn
- Medicine Faculty, Institute for Biomedical Sciences, University of Chile, Santiago, Chile.
| | | | | |
Collapse
|
34
|
Lienqueo ME, Mahn A, Salgado JC, Asenjo JA. Current insights on protein behaviour in hydrophobic interaction chromatography. J Chromatogr B Analyt Technol Biomed Life Sci 2007; 849:53-68. [PMID: 17141587 DOI: 10.1016/j.jchromb.2006.11.019] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2006] [Revised: 11/09/2006] [Accepted: 11/13/2006] [Indexed: 11/15/2022]
Abstract
This paper gives a summary of different aspects for predicting protein behaviour in hydrophobic interaction chromatography (HIC). First, a brief description of HIC, hydrophobic interactions, amino acid and protein hydrophobicity is presented. After that, several factors affecting protein chromatographic behaviour in HIC are described. Finally, different approaches for predicting protein retention time in HIC are shown. Using all this information, it could be possible to carry out computational experiments by varying the different operating conditions for the purification of a target protein; and then selecting the best conditions in silico and designing a rational protein purification process involving an HIC step.
Collapse
Affiliation(s)
- M Elena Lienqueo
- Centre for Biochemical Engineering and Biotechnology, Department of Chemical and Biotechnology Engineering, University of Chile, Beauchef 861, Santiago, Chile.
| | | | | | | |
Collapse
|
35
|
To BCS, Lenhoff AM. Hydrophobic interaction chromatography of proteins. J Chromatogr A 2007; 1141:191-205. [PMID: 17207806 DOI: 10.1016/j.chroma.2006.12.020] [Citation(s) in RCA: 88] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2006] [Revised: 11/30/2006] [Accepted: 12/05/2006] [Indexed: 11/18/2022]
Abstract
The contributions of protein and adsorbent properties to retention and recovery were examined for hydrophobic interaction chromatography (HIC) using eight commercially available phenyl media and five model proteins (ribonuclease A, lysozyme, alpha-lactalbumin, ovalbumin and BSA). The physical properties of the adsorbents were determined by inverse size exclusion chromatography (ISEC). The adsorbents examined differ from each other in terms of base matrix, ligand density, porosity, mean pore radius, pore size distribution (PSD) and phase ratio, allowing systematic studies to understand how these properties affect protein retention and recovery in HIC media. The proteins differ in such properties as adiabatic compressibility and molecular mass. The retention factors of the proteins in the media were determined by isocratic elution. The results show a very clear trend in that proteins with high adiabatic compressibility (higher flexibility) were more strongly retained. For proteins with similar adiabatic compressibilities, those with higher molecular mass showed stronger retention in Sepharose media, but this trend was not observed in adsorbents with polymethacrylate and polystyrene divinylbenzene base matrices. This observation could be related to protein recovery, which was sensitive to protein flexibility, molecular size, and conformation as well as the ligand densities and base matrices of the adsorbents. Low protein recovery during isocratic elution could affect the interpretation of protein selectivity results in HIC media. The retention data were fitted to a previously published retention model based on the preferential interaction theory, in terms of which retention is driven by release of water molecules and ions upon protein-adsorbent interaction. The calculated number of water molecules released was found to be statistically independent of protein retention strength and adsorbent and protein properties.
Collapse
Affiliation(s)
- Brian C S To
- Merck Research Laboratories, Sumneytown Pike, West Point, PA 19486, USA
| | | |
Collapse
|
36
|
Hemström P, Nordborg A, Irgum K, Svec F, Fréchet JM. Polymer-based monolithic microcolumns for hydrophobic interaction chromatography of proteins. J Sep Sci 2007; 29:25-32. [PMID: 16485706 DOI: 10.1002/jssc.200500239] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Monolithic capillary columns for hydrophobic interaction chromatography (HIC) have been prepared by thermally initiated, single-step in situ polymerization of mixtures of monovinyl monomers including butyl methacrylate and/or 2-hydroxyethyl methacrylate, with a divinyl crosslinker glycerol dimethacrylate or 1,4-butanediol dimethacrylate using two different porogen systems. Two porogenic solvent mixtures were used; one "hydrophilic", consisting of water, butanediol, and propanol, and one "hydrophobic," comprising dodecanol and cyclohexanol. The porous structures of the monoliths were characterized and their performance was demonstrated with a separation of a mixture of myoglobin, ribonuclease A, and lysozyme under conditions typical of HIC.
Collapse
|
37
|
To BCS, Lenhoff AM. Hydrophobic interaction chromatography of proteins. J Chromatogr A 2007; 1141:235-43. [PMID: 17207494 DOI: 10.1016/j.chroma.2006.12.022] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2006] [Revised: 12/02/2006] [Accepted: 12/05/2006] [Indexed: 11/21/2022]
Abstract
A general thermodynamic relation was derived to correlate protein solubility to retention in hydrophobic interaction chromatography (HIC). This relation is built on a thermodynamic formulation presented previously by Melander, Horváth and co-workers in the context of the solvophobic theory, but the final result is independent of this model framework. The relation reflects an increase in protein retention in HIC under conditions that promote precipitation or crystallization, consistent with early descriptions of HIC. To examine the contribution of protein solubility to retention in HIC, isocratic elution experiments were performed with four different commercially available agarose media and four model proteins (ribonuclease A (RNA), lysozyme (LYS), myoglobin (MYO), and ovalbumin (OVA)). A wide variety of retention trends were observed as a function of protein, adsorbent type, salt type and concentration, and pH. In general, however, the results show that solubility, or its surrogate, the second osmotic virial coefficient, which reflects solution thermodynamic properties, correlates well with HIC retention in many cases; this includes correctly predicting reverse Hofmeister effects, which cannot be explained by retention models based on the solvophobic theory and preferential interaction theory. However, solution properties could not explain retention behavior under some conditions. In those cases, effects such as protein-surface interactions or conformational change could be important determinants of protein adsorption.
Collapse
Affiliation(s)
- Brian C S To
- Merck Research Laboratories, Sumneytown Pike, West Point, PA 19486, USA
| | | |
Collapse
|
38
|
Chen J, Luo Q, Breneman CM, Cramer SM. Classification of protein adsorption and recovery at low salt conditions in hydrophobic interaction chromatographic systems. J Chromatogr A 2007; 1139:236-46. [PMID: 17126350 DOI: 10.1016/j.chroma.2006.11.026] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2006] [Revised: 11/07/2006] [Accepted: 11/09/2006] [Indexed: 11/19/2022]
Abstract
There is significant interest in establishing appropriate bioprocessing conditions for protein adsorption in hydrophobic interaction chromatographic (HIC) systems without the need for high salt concentrations. In this paper, the adsorption and recovery of proteins under low salt conditions in HIC systems was investigated using a variety of experimental and computational techniques. Parallel batch screening was employed to determine protein adsorption and recovery. Experiments were carried out with twenty six proteins using five resins with different ligand chemistry, ligand density and backbone chemistry. Proteins were classified based on various combinations of adsorption and recovery behavior. In order to gain insight into the effect of protein properties on this behavior, molecular descriptors were computed based on protein crystal structure and primary sequence information as well as a set of hydrophobicity descriptors based on the solvent accessible surface area of the proteins. Finally, classification software CART was employed to determine the key molecular descriptors associated with various types of adsorption behavior.
Collapse
Affiliation(s)
- Jie Chen
- Department of Chemical and Biological Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, USA
| | | | | | | |
Collapse
|
39
|
Ladiwala A, Xia F, Luo Q, Breneman CM, Cramer SM. Investigation of protein retention and selectivity in HIC systems using quantitative structure retention relationship models. Biotechnol Bioeng 2006; 93:836-50. [PMID: 16276531 DOI: 10.1002/bit.20771] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
In the present work, the effect of stationary phase resin chemistry and protein physicochemical properties on protein binding affinity in hydrophobic interaction chromatography (HIC) was investigated using linear gradient chromatography and quantitative structure-retention relationship (QSRR) modeling. Linear gradient experiments were carried out for a set of model proteins on four different HIC resins having different backbone and ligand chemistry. The retention data exhibited significant differences in protein binding affinity, not only across the phenyl and butyl ligand chemistries, but also for the different backbone chemistries found in the Sepharose (cross-linked agarose) and the Toyopearl 650 M (polymethacrylate) series of resins. QSRR models based on a Support Vector Machine (SVM) approach were developed for the linear retention data using molecular descriptors based on protein crystal structure and primary sequence information as well as a set of new hydrophobicity descriptors based on the solvent accessible protein surface area. The results indicate that the QSRR models were successfully able to capture and selectivity predict the changes observed in these systems. Furthermore, the new descriptors resulted in physically interpretable models of protein retention and provided insights into the factors influencing protein affinity in these different HIC systems. The approach put forth in this study provides a framework for developing predictive tools and for gaining insight into protein selectivity in hydrophobic interaction chromatography.
Collapse
Affiliation(s)
- Asif Ladiwala
- Department of Chemical and Biological Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, USA
| | | | | | | | | |
Collapse
|
40
|
Lienqueo ME, Mahn A. Predicting Protein Retention Time in Hydrophobic Interaction Chromatography. Chem Eng Technol 2005. [DOI: 10.1002/ceat.200500111] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
41
|
Graumann K, Ebenbichler AA. Development and Scale up of Preparative HIC for the Purification of a Recombinant Therapeutic Protein. Chem Eng Technol 2005. [DOI: 10.1002/ceat.200500165] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
|
42
|
Xia F, Nagrath D, Cramer SM. Effect of pH changes on water release values in hydrophobic interaction chromatographic systems. J Chromatogr A 2005; 1079:229-35. [PMID: 16038309 DOI: 10.1016/j.chroma.2005.04.005] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The effect on pH on protein binding in HIC systems was investigated. Isocratic experiments were carried out to determine the capacity factors of various proteins as a function of temperature, pH and salt type. This paper presents a framework based on the Maxwell linkage function for estimating the number of released water molecules during the adsorption/desorption process due to a change of buffer pH. This approach also enables one to predict the effect of pH change on the water released values upon binding at any temperature condition. The results indicate that the total number of released water molecules (delta nu) for a pH change increased more on aromatic surfaces (phenyl Sepharose) than on aliphatic resins (butyl Sepharose). The results also indicate that the total number of released water molecules (deltanu) for a pH change increased with salt concentration and when changing from chaotropic to kosmotropic salts. The (deltanu) values also increased as the buffer pH approached the protein's pI, and decreased away from its pI. This work helps to establish a framework for the investigation of pH effects on protein selectivity in HIC systems.
Collapse
Affiliation(s)
- Fang Xia
- Howard P. Isermann Department of Chemical and Biological Engineering, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY 12180-3590, USA
| | | | | |
Collapse
|