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de Oliveira ACF, Neves ICO, Saraiva JAM, de Carvalho MFF, Batista GA, Veríssimo LAA, Resende JVD. Capture of lysozyme on macroporous cryogels by hydrophobic affinity chromatography. SEP SCI TECHNOL 2019. [DOI: 10.1080/01496395.2019.1617743] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Aasim M, Khan MH, Rahman IU, Bibi NS, Ali W, Khan NZ, Khan AA. Comparative analysis of the methods used for finding surface energy to investigate protein interaction behavior on chromatographic supports. Biotechnol Prog 2019; 35:e2828. [PMID: 31025822 DOI: 10.1002/btpr.2828] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2019] [Revised: 03/26/2019] [Accepted: 04/17/2019] [Indexed: 11/09/2022]
Abstract
Hydrophobic interaction chromatography, an important and effective purification strategy, is generally used for the purification of variety of biomolecules. A basic understanding of the protein interaction behavior is required to effectively separate these biomolecules. A colloidal type extended Derjaguin, Landau, Verwey, and Overbeek calculations were utilized to study the interactions behavior of model proteins to commercially available hydrophobic chromatographic materials that is, Toyopearl Phenyl 650C and Toyopearl Butyl 650C. Physicochemical properties of selected model proteins were achieved by contact angle and zeta potential measurements. The contact angle of chromatographic materials used was achieved through sessile drop method on disrupted beads and capillary penetration method (CPM) on intact beads. The surface properties were further used to calculate the interactions of the proteins to chromatographic supports. The calculated secondary energy minimum of the proteins with the chromatographic materials (from the contact angle values determined through both methods can be correlated with the retention volumes from the real chromatography. The secondary energy minimum values are higher for each protein to the chromatographic materials calculated from the inputs derived through sessile drop method compared to CPM. For instance, immunoglobulin G has secondary energy minimum value of 0.17 kT compared to 0.11 kT, obtained through sessile drop method and CPM, respectively. Average relative values of the energy minimum calculated for all proteins are as 1.51 kT and 1.29 kT for Toyopearl Butyl 650C and Toyopearl Phenyl 650C, respectively, as a conversion factor for estimation of secondary energy minimum for both methods.
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Affiliation(s)
- Muhammad Aasim
- Department of Biotechnology, University of Malakand, Lower Dir, Khyber Pakhtunkhwa, Pakistan
| | - Muhammad H Khan
- Hefei National Laboratory for Physical Sciences at Microscale, School of Life Sciences, University of Science and Technology of China, Hefei, Anhui, China
| | - Inam U Rahman
- Fuli Institute of Food Science, College of Biosystems Engineering and Food Science, Zhejiang Key Laboratory for Agro-Food Processing, Zhejiang University, Hangzhou, China
| | - Noor Shad Bibi
- Department of Biochemistry, Abdul Wali Khan University Mardan, Mardan, Khyber Pakhtunkhwa, Pakistan
| | - Waqar Ali
- Department of Biotechnology, University of Malakand, Lower Dir, Khyber Pakhtunkhwa, Pakistan
| | - Nadir Z Khan
- Department of Biotechnology, University of Malakand, Lower Dir, Khyber Pakhtunkhwa, Pakistan
| | - Abid A Khan
- Department of Biosciences, COMSATS Institute of information Technology, Islamabad, Pakistan
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Creasy A, Lomino J, Barker G, Khetan A, Carta G. Gradient elution behavior of proteins in hydrophobic interaction chromatography with U-shaped retention factor curves. J Chromatogr A 2018; 1547:53-61. [DOI: 10.1016/j.chroma.2018.03.012] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2018] [Revised: 02/16/2018] [Accepted: 03/07/2018] [Indexed: 11/24/2022]
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Wong FWF, Ariff AB, Stuckey DC. Downstream protein separation by surfactant precipitation: a review. Crit Rev Biotechnol 2017; 38:31-46. [DOI: 10.1080/07388551.2017.1312266] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Fadzlie Wong Faizal Wong
- Department of Chemical Engineering, Imperial College London, London, UK
- Department of Bioprocess Technology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
- Bioprocessing and Biomanufacturing Research Centre, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
| | - Arbakariya B. Ariff
- Department of Bioprocess Technology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
- Bioprocessing and Biomanufacturing Research Centre, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
| | - David C. Stuckey
- Department of Chemical Engineering, Imperial College London, London, UK
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Demirçelik AH, Perçin I, Denizli A. Supermacroporous hydrophobic affinity sorbents for penicillin acylase purification. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2017. [DOI: 10.1080/10601325.2017.1261618] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
| | - Işık Perçin
- Molecular Biology Division, Department of Biology, Hacettepe University, Ankara, Turkey
| | - Adil Denizli
- Biochemistry Division, Department of Chemistry, Hacettepe University, Ankara, Turkey
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Aasim M, Kakarla PB, D'Souza RN, Bibi NS, Klein TY, Treccani L, Rezwan K, Fernández-Lahore M. The role of ligands on protein retention in adsorption chromatography: a surface energetics approach. J Sep Sci 2014; 37:618-24. [PMID: 24449610 DOI: 10.1002/jssc.201301338] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2013] [Revised: 01/09/2014] [Accepted: 01/09/2014] [Indexed: 11/10/2022]
Abstract
Protein adsorption onto hydrophobic chromatographic supports has been investigated using a colloid theory surface energetics approach. The surface properties of commercially available chromatographic beads, Toyopearl Phenyl 650-C, and Toyopearl Butyl 650-C, have been experimentally determined by contact angle and zeta potential measurements. The adsorption characteristics of these beads, which bear the same backbone matrix but harbor different ligands, have been studied toward selected model proteins, in the hydrated as well as dehydrated state. There were two prominent groups of proteins observed with respect to the chromatographic supports presented in this work: loosely retained proteins, which were expected to have lower average interaction energies, and the strongly retained proteins, which were expected to have higher average interaction energies. Results were also compared and contrasted with calculations derived from adsorbent surface energies determined by inverse liquid chromatography. These results showed a good qualitative agreement, and the interaction energy minima obtained from these extended Derjaguin, Landau, Verwey and Overbeek calculations were shown to correlate well with the experimentally determined adsorption behavior of each protein.
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Affiliation(s)
- Muhammad Aasim
- Downstream Bioprocessing Laboratory, School of Engineering and Science, Jacobs University, Campus Ring 1, Bremen, Germany; Department of Biotechnology, University of Malakand, Chakdara, Dir, Khyber Pakhtunkhwa, Pakistan
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8
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Liu WL, Wu CY, Li YT, Huang HY. Penicillin analyses by capillary electrochromatography-mass spectrometry with different charged poly(stearyl methacrylate–divinylbenzene) monoliths as stationary phases. Talanta 2012; 101:71-7. [DOI: 10.1016/j.talanta.2012.08.026] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2012] [Revised: 08/20/2012] [Accepted: 08/21/2012] [Indexed: 10/27/2022]
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9
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Wang Q, Ismail B. Effect of Maillard-induced glycosylation on the nutritional quality, solubility, thermal stability and molecular configuration of whey proteinv. Int Dairy J 2012. [DOI: 10.1016/j.idairyj.2012.02.009] [Citation(s) in RCA: 82] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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10
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Aasim M, Bibi NS, Vennapusa RR, Fernandez-Lahore M. Extended DLVO calculations expose the role of the structural nature of the adsorbent beads during chromatography. J Sep Sci 2012; 35:1068-78. [DOI: 10.1002/jssc.201100719] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | - Noor Shad Bibi
- Downstream Bioprocessing Laboratory; School of Engineering and Science; Jacobs University; Bremen; Germany
| | - Rami Reddy Vennapusa
- Downstream Bioprocessing Laboratory; School of Engineering and Science; Jacobs University; Bremen; Germany
| | - Marcelo Fernandez-Lahore
- Downstream Bioprocessing Laboratory; School of Engineering and Science; Jacobs University; Bremen; Germany
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11
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12
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Protein separation on a polar-copolymerized C8 stationary phase. Anal Bioanal Chem 2010; 399:3415-21. [DOI: 10.1007/s00216-010-4462-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2010] [Revised: 10/21/2010] [Accepted: 11/22/2010] [Indexed: 10/18/2022]
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Tiwari N, Woods L, Haley R, Kight A, Goforth R, Clark K, Ataai M, Henry R, Beitle R. Identification and characterization of native proteins of Escherichia coli BL-21 that display affinity towards Immobilized Metal Affinity Chromatography and Hydrophobic Interaction Chromatography Matrices. Protein Expr Purif 2010; 70:191-5. [DOI: 10.1016/j.pep.2009.10.018] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2009] [Revised: 10/28/2009] [Accepted: 10/29/2009] [Indexed: 10/20/2022]
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14
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Altering efficiency of hydrophobic interaction chromatography by combined salt and temperature effects. J Chromatogr A 2009; 1216:8712-21. [DOI: 10.1016/j.chroma.2009.04.046] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2008] [Revised: 04/14/2009] [Accepted: 04/15/2009] [Indexed: 10/20/2022]
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Muca R, Piątkowski W, Antos D. Effects of thermal heterogeneity in hydrophobic interaction chromatography. J Chromatogr A 2009; 1216:6716-27. [DOI: 10.1016/j.chroma.2009.08.007] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2009] [Revised: 07/30/2009] [Accepted: 08/05/2009] [Indexed: 11/30/2022]
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16
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Nunes CA, Dias-Cabral ACM. Angiotensin I retention behavior on Butyl-Sepharose under linear loading chromatographic conditions. J Chromatogr A 2009; 1216:2332-8. [DOI: 10.1016/j.chroma.2009.01.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2008] [Revised: 12/27/2008] [Accepted: 01/02/2009] [Indexed: 11/28/2022]
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17
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Hydrophobic interaction chromatography of proteins. J Chromatogr A 2008; 1205:46-59. [DOI: 10.1016/j.chroma.2008.07.079] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2008] [Revised: 07/22/2008] [Accepted: 07/25/2008] [Indexed: 11/18/2022]
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18
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Jönsson M, Skepö M, Linse P. Monte Carlo simulations of the hydrophobic effect in aqueous electrolyte solutions. J Phys Chem B 2007; 110:8782-8. [PMID: 16640436 DOI: 10.1021/jp0604241] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The hydrophobic interaction between two methane molecules in salt-free and high salt-containing aqueous solutions and the structure in such solutions have been investigated using an atomistic model solved by Monte Carlo simulations. Monovalent salt representing NaCl and divalent salt with the same nonelectrostatic properties as the monovalent salt have been used to examine the influence of the valence of the salt species. In salt-free solution the effective interaction between the two methane molecules displayed a global minimum at close contact of the two methane molecules and a solvent-separated secondary minimum. In 3 and 5 M monovalent salt solution the potential of mean force became slightly more attractive, and in a 3 M divalent salt solution the attraction became considerably stronger. The structure of the aqueous solutions was determined by radial distribution functions and angular probability functions. The distortion of the native water structure increased with ion valence. The increase of the hydrophobic attraction was associated with (i) a breakdown of the tetrahedral structure formed by neighboring water molecules and of the hydrogen bonds between them and (i) the concomitant increase of the solution density.
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Affiliation(s)
- Malin Jönsson
- Biochemistry and Physical Chemistry 1, Lund University, Box 124, SE-221 00 Lund, Sweden
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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.
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Affiliation(s)
- M Elena Lienqueo
- Centre for Biochemical Engineering and Biotechnology, Department of Chemical and Biotechnology Engineering, University of Chile, Beauchef 861, Santiago, Chile.
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Millea KM, Krull IS. Subproteomics in Analytical Chemistry: Chromatographic Fractionation Techniques in the Characterization of Proteins and Peptides. J LIQ CHROMATOGR R T 2007. [DOI: 10.1081/jlc-120023244] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Kevin M. Millea
- a Department of Chemistry and Chemical Biology , Northeastern University , 102 Hurtig Hall, 360 Huntington Ave., Boston , Massachusetts , 02115 , USA
| | - Ira S. Krull
- a Department of Chemistry and Chemical Biology , Northeastern University , 102 Hurtig Hall, 360 Huntington Ave., Boston , Massachusetts , 02115 , USA
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21
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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.
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Affiliation(s)
- Brian C S To
- Merck Research Laboratories, Sumneytown Pike, West Point, PA 19486, USA
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22
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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.
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Affiliation(s)
- Jie Chen
- Department of Chemical and Biological Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, USA
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Fogle JL, O'Connell JP, Fernandez EJ. Loading, stationary phase, and salt effects during hydrophobic interaction chromatography: α-Lactalbumin is stabilized at high loadings. J Chromatogr A 2006; 1121:209-18. [PMID: 16690064 DOI: 10.1016/j.chroma.2006.04.015] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2005] [Revised: 02/03/2006] [Accepted: 04/07/2006] [Indexed: 11/25/2022]
Abstract
Amide hydrogen-deuterium exchange labeling has been used to study the effects of salt and protein loading on alpha-lactalbumin (BLA) stability during hydrophobic interaction chromatography (HIC). Stability in the adsorbed phase increased dramatically with increasing loading, and unfolding was nearly undetectable close to the resin saturation capacity. We also found that a butyl surface destabilized BLA more than a phenyl surface, despite the fact that BLA was bound more strongly on the phenyl surface. These observations have important implications for HIC process design and indicate that in some cases column capacity does not have to be sacrificed to preserve protein stability.
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Affiliation(s)
- Jace L Fogle
- Department of Chemical Engineering, University of Virginia, 102 Engineers' Way, P.O. Box 400741, Charlottesville, VA 22904-4741, USA
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Kato Y, Nakamura K, Kitamura T, Hasegawa M, Sasaki H. Hydrophobic interaction chromatography at low salt concentration for the capture of monoclonal antibodies. J Chromatogr A 2004; 1036:45-50. [PMID: 15139412 DOI: 10.1016/j.chroma.2004.02.009] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
We evaluated hydrophobic interaction chromatography (HIC) at low salt concentration for the capture of proteins from feed stocks by using monoclonal antibodies as model samples. It was indicated that the HIC at low salt concentration on critical hydrophobicity supports has a potential for capturing hydrophobic monoclonal antibodies directly from large volumes of feed stocks and recovering bound monoclonal antibodies in high yield. On the other hand, the HIC at low salt concentration did not seem so useful for the capture of weakly hydrophobic monoclonal antibodies. The recovery of weakly hydrophobic monoclonal antibodies from columns packed with critical hydrophobicity supports was not quantitative and significantly decreased as the residence time of the monoclonal antibodies in the columns became longer.
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Affiliation(s)
- Yoshio Kato
- Nanyo Research Laboratory, Tosoh Corporation, Kaisei-cho 4560, Shunan, Yamaguchi 746-8501, Japan.
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Jones TT, Fernandez EJ. Hydrophobic interaction chromatography selectivity changes among three stable proteins: conformation does not play a major role. Biotechnol Bioeng 2004; 87:388-99. [PMID: 15281113 DOI: 10.1002/bit.20123] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Interesting retention and selectivity changes have been noted for a number of proteins in hydrophobic interaction chromatography (HIC). In this study, we investigated the degree to which conformational changes may be responsible for selectivity changes of stable proteins. Hydrogen-deuterium isotope exchange detected by mass spectrometry was used to investigate changes in solvent accessibility during adsorption on HIC media. Lysozyme was determined to exhibit EX2 hydrogen exchange kinetics both in solution and adsorbed to Butyl Sepharose 4 Fast Flow and Phenyl Sepharose 6 Fast Flow high sub surfaces. A small, but significant, increase in solvent accessibility was observed upon adsorption. Similar approaches were used to analyze solvent accessibility of three stable proteins with melting temperatures above 50 degrees C exhibiting significant selectivity changes on Butyl Sepharose and Toyopearl Butyl 650M. While all three proteins (lysozyme, chymotrypsinogen A, and ovalbumin) exhibited enhanced exchange while adsorbed, no differences in solvent accessibility on the different adsorbents were observed. More detailed studies of lysozyme showed no significant changes in labeling prior or during elution. These results demonstrate that HIC surfaces examined here do not dramatically alter the structure of these stable proteins and that differences in conformation are not responsible for the selectivity changes observed. Thus, other factors such as different preferred binding orientations or variations between the media pore structure, size, and/or surface chemistry must be responsible.
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Affiliation(s)
- Tara Tibbs Jones
- Department of Chemical Engineering, University of Virginia, 102 Engineers' Way, PO Box 400741, Charlottesville, Virginia 22904-4741, USA
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Kato Y, Nakatani S, Nakamura K, Kitamura T, Moriyama H, Hasegawa M, Sasaki H. Hydrophobicity gradient columns for the separation of trypsin inhibitor by hydrophobic interaction chromatography at low salt concentration. J Chromatogr A 2003; 986:83-8. [PMID: 12585325 DOI: 10.1016/s0021-9673(02)01997-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
We investigated hydrophobicity gradient columns composed of two columns packed with supports of different hydrophobicities in order to save time in protein separation by hydrophobic interaction chromatography at low salt concentration using a crude sample of trypsin inhibitor as a model sample. One of the two hydrophobicity gradient columns was packed with a support whose hydrophobicity was critically controlled for target protein (trypsin inhibitor) and the other was packed with a support which was less hydrophobic than the critically controlled hydrophobicity support. It was found that the hydrophobicity gradient columns are useful to separate samples containing impurities of a wide range of hydrophobicities within a reasonable time.
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Affiliation(s)
- Yoshio Kato
- Nanyo Research Laboratory, Tosoh Corporation, Kaisei-cho 4560, Shinnanyo, Yamaguchi 746-8501, Japan.
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