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Cai DL, Thanh DTH, Show PL, How SC, Chiu CY, Hsu M, Chia SR, Chen KH, Chang YK. Studies of Protein Wastes Adsorption by Chitosan-Modified Nanofibers Decorated with Dye Wastes in Batch and Continuous Flow Processes: Potential Environmental Applications. MEMBRANES 2022; 12:membranes12080759. [PMID: 36005674 PMCID: PMC9416031 DOI: 10.3390/membranes12080759] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Revised: 07/26/2022] [Accepted: 07/30/2022] [Indexed: 01/01/2023]
Abstract
In this study, reactive green 19 dye from wastewater was immobilized on the functionalized chitosan nanofiber membranes to treat soluble microbial proteins in biological wastewater. Polyacrylonitrile nanofiber membrane (PAN) was prepared by the electrospinning technique. After heat treatment, alkaline hydrolysis, and chemically grafted with chitosan to obtain modified chitosan nanofibers (P-COOH-CS), and finally immobilized with RG19 dye, dyed nanofibers were generated (P-COOH-CS-RG19). The synthesis of P-COOH-CS and P-COOH-CS-RG19 are novel materials for protein adsorption that are not deeply investigated currently, with each of the material functions based on their properties in significantly improving the adsorption efficiency. The nanofiber membrane shows good adsorption capacity and great recycling performance, while the application of chitosan and dye acts as the crosslinker in the nanofiber membrane and consists of various functional groups to enhance the adsorption of protein. The dyed nanofibers were applied for the batch adsorption of soluble protein (i.e., lysozyme), and the process parameters including chitosan’s molecular weight, coupling pH, chitosan concentration, dye pH, dye concentration, and lysozyme pH were studied. The results showed that the molecular weight of chitosan was 50 kDa, pH 5, concentration 0.5%, initial concentration of dye at 1 mg/mL dye and pH 12, lysozyme solution at 2 mg/mL at pH 8, and the maximum adsorption capacity was 1293.66 mg/g at a temperature of 318 K. Furthermore, thermodynamic, and kinetic studies suggested that the adsorption behavior of lysozyme followed the Langmuir adsorption isotherm model and the pseudo-second-order kinetic model. The optimal adsorption and desorption conditions based on batch experiments were directly applied to remove lysozyme in a continuous operation. This study demonstrated the potential of dyed nanofibers as an efficient adsorbent to remove approximately 100% of lysozyme from the simulated biological wastewater.
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Affiliation(s)
- Dai-Lun Cai
- Department of Chemical Engineering, Ming Chi University of Technology, New Taipei City 243303, Taiwan; (D.-L.C.); (C.-Y.C.)
| | - Dinh Thi Hong Thanh
- Department of Safety, Health and Environmental Engineering, Ming Chi University of Technology, New Taipei City 243303, Taiwan;
| | - Pau-Loke Show
- Zhejiang Provincial Key Laboratory for Subtropical Water Environment and Marine Biological Resources Protection, Wenzhou University, Wenzhou 325035, China;
- Department of Chemical and Environmental Engineering, Faculty of Science and Engineering, University of Nottingham Malaysia, Semenyih 43500, Malaysia
| | - Su-Chun How
- Department of Chemical Engineering and Biotechnology, Tatung University, Taipei 10452, Taiwan;
| | - Chen-Yaw Chiu
- Department of Chemical Engineering, Ming Chi University of Technology, New Taipei City 243303, Taiwan; (D.-L.C.); (C.-Y.C.)
| | - Michael Hsu
- Chemist Scientific Corp., Taishan Dist., New Taipei City 243303, Taiwan;
| | - Shir Reen Chia
- Institute of Sustainable Energy, Universiti Tenaga Nasional, Jalan IKRAM-UNITEN, Kajang 43000, Malaysia;
| | - Kuei-Hsiang Chen
- Department of Chemical Engineering, Ming Chi University of Technology, New Taipei City 243303, Taiwan; (D.-L.C.); (C.-Y.C.)
- Correspondence: (K.-H.C.); (Y.-K.C.)
| | - Yu-Kaung Chang
- Department of Chemical Engineering, Ming Chi University of Technology, New Taipei City 243303, Taiwan; (D.-L.C.); (C.-Y.C.)
- Correspondence: (K.-H.C.); (Y.-K.C.)
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Removal of calcium ions from aqueous solution by bovine serum albumin (BSA)-modified nanofiber membrane: Dynamic adsorption performance and breakthrough analysis. Biochem Eng J 2021. [DOI: 10.1016/j.bej.2021.108016] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Tan S, Boysen RI, Saito K, Hearn MT. Dynamic adsorption/desorption of proteins with thermo-responsive polymer grafted sepharose fast flow sorbents. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2020.118173] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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4
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Studies on the application of temperature-responsive ion exchange polymers with whey proteins. J Chromatogr A 2016; 1438:113-22. [DOI: 10.1016/j.chroma.2016.02.020] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2015] [Revised: 02/04/2016] [Accepted: 02/04/2016] [Indexed: 11/23/2022]
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Mountford SJ, Daly R, Robinson AJ, Hearn MTW. Design, synthesis and evaluation of pyridine-based chromatographic adsorbents for antibody purification. J Chromatogr A 2014; 1355:15-25. [PMID: 24973801 DOI: 10.1016/j.chroma.2014.06.006] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2013] [Revised: 05/29/2014] [Accepted: 06/03/2014] [Indexed: 11/30/2022]
Abstract
The structure-based design and synthesis of four series of adsorbents for antibody purification by affinity chromatography has been investigated. The structures of 10 ligands were based on pyridine compounds that possessed thioalkyl substituents containing a primary amine, which was required for immobilisation of the ligands onto an epoxy-activated matrix (epoxy-Sepharose Fast Flow(®)). These new adsorbents were screened in monoclonal antibody binding assays in order to determine optimal buffer conditions for capture and elution under static and dynamic adsorption conditions. From batch binding measurements, the binding affinities, KD's, were found to be in the range of 3-5μM and the maximum capacities, qm's were between 12 and 30mgmAb/mL resin, depending on the substitution pattern of the thioalkylamine in the N-heterocyclic ring structure of the ligands. The amount of monoclonal antibody bound and eluted under overload conditions was influenced by the concentration of the sample loaded, the flow rate at which the sample was applied and the loading/volume. Further, the ability of these new adsorbents to selectively capture monoclonal antibodies of the class IgG1 from supernatants derived from genetically engineered CHO cells cultured in chemically defined media was investigated, documenting efficient capture and recovery of the mAb.
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Affiliation(s)
- Simon J Mountford
- Centre for Green Chemistry, School of Chemistry, Monash University, Clayton 3800, VIC, Australia
| | - Rachel Daly
- Centre for Green Chemistry, School of Chemistry, Monash University, Clayton 3800, VIC, Australia
| | - Andrea J Robinson
- Centre for Green Chemistry, School of Chemistry, Monash University, Clayton 3800, VIC, Australia
| | - Milton T W Hearn
- Centre for Green Chemistry, School of Chemistry, Monash University, Clayton 3800, VIC, Australia.
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Studies with an immobilized metal affinity chromatography cassette system involving binuclear triazacyclononane-derived ligands: automation of batch adsorption measurements with tagged recombinant proteins. J Chromatogr A 2014; 1351:61-9. [PMID: 24891160 DOI: 10.1016/j.chroma.2014.05.030] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2013] [Revised: 05/09/2014] [Accepted: 05/13/2014] [Indexed: 11/21/2022]
Abstract
This study describes the determination of the adsorption isotherms and binding kinetics of tagged recombinant proteins using a recently developed IMAC cassette system and employing automated robotic liquid handling procedures for IMAC resin screening. These results confirm that these new IMAC resins, generated from a variety of different metal-charged binuclear 1,4,7-triaza-cyclononane (tacn) ligands, interact with recombinant proteins containing a novel N-terminal metal binding tag, NT1A, with static binding capacities similar to those obtained with conventional hexa-His tagged proteins, but with significantly increased association constants. In addition, higher kinetic binding rates were observed with these new IMAC systems, an attribute that can be positively exploited to increase process productivity. The results from this investigation demonstrate that enhancements in binding capacities and affinities were achieved with these new IMAC resins and chosen NT1A tagged protein. Further, differences in the binding performances of the bis(tacn) xylenyl-bridged ligands were consistent with the distance between the metal binding centres of the two tacn moieties, the flexibility of the ligand and the potential contribution from the aromatic ring of the xylenyl group to undergo π/π stacking interactions with the tagged proteins.
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Alibolandi M, Mirzahoseini H. Purification and Refolding of Overexpressed Human Basic Fibroblast Growth Factor in Escherichia coli. BIOTECHNOLOGY RESEARCH INTERNATIONAL 2011; 2011:973741. [PMID: 21837279 PMCID: PMC3151512 DOI: 10.4061/2011/973741] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/16/2011] [Revised: 05/21/2011] [Accepted: 06/08/2011] [Indexed: 11/20/2022]
Abstract
This work describes the integration of expanded bed adsorption (EBA) and adsorptive protein refolding operations used to recover purified and biologically active human basic fibroblast growth factor from inclusion bodies expressed in E. coli. Insoluble overexpressed human basic fibroblast growth factor has been purified on CM Hyper Z matrix by expanded bed adsorption after isolation and solubilization in 8 M urea. The adsorption was made in expanded bed without clarification steps such as centrifugation. Column refolding was done by elimination of urea and elution with NaCl. The human basic fibroblast growth factor was obtained as a highly purified soluble monomer form with similar behavior in circular dichroism and fluorescence spectroscopy as native protein. A total of 92.52% of the available human basic fibroblast growth factor was recovered as biologically active and purified protein using the mentioned purification and refolding process. This resulted in the first procedure describing high-throughput purification and refolding of human basic fibroblast growth factor in one step and is likely to have the greatest benefit for proteins that tend to aggregate when refolded by dilution.
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Affiliation(s)
- Mona Alibolandi
- Medical Biotechnology Research Center, Pasteur Institute of Iran, Tehran, 1316943551, Iran
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Kale S, Lali A. Characterization of superporous cellulose matrix for high-throughput adsorptive purification of lysozyme. Biotechnol Prog 2011; 27:1078-90. [DOI: 10.1002/btpr.572] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2010] [Revised: 08/26/2010] [Indexed: 11/12/2022]
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Simulation of the breakthrough curves for the adsorption of α-lactalbumin and β-lactoglobulin to SP Sepharose FF cation-exchanger. Biochem Eng J 2010. [DOI: 10.1016/j.bej.2009.12.017] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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10
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Maharjan P, Hearn MT, Jackson WR, De Silva K, Woonton BW. Development of a temperature-responsive agarose-based ion-exchange chromatographic resin. J Chromatogr A 2009; 1216:8722-9. [DOI: 10.1016/j.chroma.2009.04.037] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2008] [Revised: 04/01/2009] [Accepted: 04/14/2009] [Indexed: 11/24/2022]
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11
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Chong FC, Tan WS, Biak DRA, Ling TC, Tey BT. Purification of histidine-tagged nucleocapsid protein of Nipah virus using immobilized metal affinity chromatography. J Chromatogr B Analyt Technol Biomed Life Sci 2009; 877:1561-7. [DOI: 10.1016/j.jchromb.2009.03.048] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2009] [Revised: 03/31/2009] [Accepted: 03/31/2009] [Indexed: 11/28/2022]
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12
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Bak H, Thomas ORT. Evaluation of commercial chromatographic adsorbents for the direct capture of polyclonal rabbit antibodies from clarified antiserum. J Chromatogr B Analyt Technol Biomed Life Sci 2007; 848:116-30. [PMID: 16931195 DOI: 10.1016/j.jchromb.2006.07.003] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2006] [Revised: 06/30/2006] [Accepted: 07/10/2006] [Indexed: 10/24/2022]
Abstract
We have carried out a rigorous evaluation of eight commercially available packed bed chromatography adsorbents for direct capture and purification of immunoglobulins from clarified rabbit antiserum. Three of these materials featured rProtein A (rProtein A Sepharose Fast Flow, Mabselect, Prosep rProtein A) as the affinity ligand, and differed from one another primarily with respect to the underlying base matrix. The remaining five matrices comprised various synthetic low molecular weight ligands immobilised on hydrophilic porous supports and these included: MEP HyperCel, MabSorbent A1P, MabSorbent A2P, FastMabsA and Kaptiv-GY. The general experimental approach taken was to sequentially challenge packed beds of each matrix with a series of different strengths of a clarified antiserum; beginning with the weakest and ending with the strongest. Marked differences in performance (principally evaluated on the basis of dynamic binding capacity, recovery, and purity) were obtained, which allowed clear recommendations concerning the choice of adsorbents best suited for antibody capture from rabbit antisera, to be made.
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Affiliation(s)
- H Bak
- Center for Microbial Biotechnology, BioCentrum-DTU, Technical University of Denmark, Building 223, Søltofts Plads, DK-2800 Lyngby, Denmark
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Klose T, Welzel PB, Werner C. Protein adsorption from flowing solutions on pure and maleic acid copolymer modified glass particles. Colloids Surf B Biointerfaces 2006; 51:1-9. [PMID: 16797943 DOI: 10.1016/j.colsurfb.2006.04.019] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2006] [Revised: 04/13/2006] [Accepted: 04/24/2006] [Indexed: 11/21/2022]
Abstract
The adsorption of human serum albumin (HSA) and lysozyme (LSZ) on pure as well as maleic acid (MA) copolymer coated spherical soda lime glass particles was investigated under flowing conditions. Coating the glass particles with two different maleic acid copolymers alters the properties of the particle surface concerning its charge and hydrophobicity in a well-defined gradation. Frontal chromatography was used to determine the surface concentration of the adsorbed proteins and to establish adsorption isotherms. The introduced methodology was demonstrated to provide a powerful means to study protein adsorption at solid/liquid interfaces. Investigations with virginal and protein-preadsorbed glass particles revealed that even under streaming conditions HSA is irreversibly adsorbed, whereas LSZ partially desorbs. For LSZ and HSA the adsorbed amounts and the isotherms strongly depend on the surface "history", i.e. the presence or absence of preadsorbed protein layers, and the kind of surface modification of the glass. Compared to the soda lime glass surface the adsorption of HSA was strongly increased on surfaces modified with a hydrophobic maleic acid copolymer indicating a strong hydrophobic protein-surface interaction. By coating the surface with a hydrophilic and more negatively charged maleic acid copolymer the adsorption of HSA to that surface was lower and comparable to the adsorption onto plain glass due to the electrostatic repulsion between HSA and the modified surface. In contrast the affinity to any of the investigated particle surfaces was generally higher for LSZ than for HSA which can be mainly attributed to the electrostatic attraction between LZS and the surface. The adsorbed amount of LSZ on the copolymer coated particle surfaces was much higher than on the pure soda lime glass particles indicating superposed hydrophobic interactions in the case of the hydrophobic MA copolymer layer and an increased density of anionic sites as well as interactions of LSZ within the three-dimensional (swollen), hydrophilic MA copolymer layer.
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Affiliation(s)
- Theresia Klose
- Leibniz Institute of Polymer Research Dresden, Max Bergmann Center of Biomaterials Dresden, Hohe Str. 6, 01069 Dresden, Germany.
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14
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Chang YK, Chang IP. Method development for direct recovery of lysozyme from highly crude chicken egg white by stirred fluidized bed technique. Biochem Eng J 2006. [DOI: 10.1016/j.bej.2006.02.006] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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15
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Wright PR, Glasser BJ. Modeling mass transfer and hydrodynamics in fluidized-bed adsorption of proteins. AIChE J 2006. [DOI: 10.1002/aic.690470224] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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16
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Ling TC, Lyddiatt A. Process intensification of fluidized bed dye-ligand adsorption of G3PDH from unclarified disrupted yeast: A case study of the performance of a high-density steel–agarose pellicular adsorbent. Protein Expr Purif 2005; 42:160-5. [PMID: 15939302 DOI: 10.1016/j.pep.2005.03.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2005] [Revised: 03/04/2005] [Accepted: 03/04/2005] [Indexed: 11/16/2022]
Abstract
The development of a process intensified primary capture step for the direct selective recovery of intracellular proteins from very dense particulate-containing yeast extract has been explored. The purification of glyceraldehyde 3-phosphate dehydrogenase from bakers' yeast was chosen as a potential demonstration of this approach. A high throughput (50%, w/v, yeast extracts at a superficial linear velocity of 450 cm h(-1)) was achieved by adoption of a high-density adsorbent (UpFront steel-agarose; rho = 2.65 g ml(-1)) derivatized with selective ligand chemistries (Cibacron Blue 3GA). This should ultimately minimize adsorption time and maximize process efficiency of fluidized bed adsorption.
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Affiliation(s)
- Tau Chuan Ling
- Biochemical Recovery Group, Department of Chemical Engineering, School of Engineering, University of Birmingham, Edgbaston, UK.
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Abstract
Novel dense composite adsorbents for expanded bed adsorption of protein have been fabricated by coating 4% agarose gel onto Nd-Fe-B alloy powder by a water-in-oil emulsification method. Two composite matrices, namely Nd-Fe-B alloy-densified agarose (NFBA) gels with different size distributions and densities, NFBA-S (50-165 microm, 1.88 g/ml) and NFBA-L (140-300 microm, 2.04 g/ml), were produced. Lysozyme was used as a model protein to test the adsorption capacity and kinetics for the NFBA gels modified by Cibacron blue 3GA (CB-NFBA gels). Liquid-phase dispersion behavior in the expanded beds was examined by measurements of residence time distributions, and compared with that of Streamline SP (Amersham-Pharmacia Biotech, Sweden). The dependence of axial mixing in the expanded beds on flow velocity, bed expansion degree. settled bed height, and viscosity of liquid phase was investigated. Breakthrough curves of lysozyme in the expanded beds of the CB-NFBA gels were also examined. The dynamic binding capacity at 5% breakthrough was 23.3 mg/ml matrix for the CB-NFBA-S gels, and 16.7 mg/ml matrix for the CB-NFBA-L, at a flow velocity of 220 cm/h. The results indicate that the NFBA gels are promising for expanded bed adsorption of proteins.
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Affiliation(s)
- Xiao-Dong Tong
- Department of Biochemical Engineering, School of Chemical Engineering and Technology, Tianjin University, China
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Fabrication and characterisation of a novel pellicular adsorbent customised for the effective fluidised bed adsorption of protein products. BIOTECHNOL BIOPROC E 2001. [DOI: 10.1007/bf02932323] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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20
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Arévalo E, Rendueles M, Fernández A, Dı́az M. Equilibrium and simulation of the operation for the adsorption of albumin proteins in an iminodiacetic-Cu bounded ion exchange resin (IMAC). Sep Purif Technol 2000. [DOI: 10.1016/s1383-5866(99)00068-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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Clemmitt RH, Chase HA. Facilitated downstream processing of a histidine-tagged protein from unclarified E. coli homogenates using immobilized metal affinity expanded-bed adsorption. Biotechnol Bioeng 2000; 67:206-16. [PMID: 10592518 DOI: 10.1002/(sici)1097-0290(20000120)67:2<206::aid-bit10>3.0.co;2-x] [Citation(s) in RCA: 76] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The facilitated downstream processing of an intracellular, polyhistidine-tagged protein, glutathione S-transferase [GST-(His)(6)], direct from unclarified E. coli homogenates using expanded beds of STREAMLINE chelating, has been investigated. A series of pilot experiments were used to develop preparative-scale separations of GST-(His)(6), initially in packed and then in expanded beds. Packed beds of Ni(2+)-loaded STREAMLINE chelating proved to have the highest 5% dynamic capacity for GST-(His)(6), of 357 U mL(-1) (36 mg mL(-1)). When using immobilized Cu(2+) or Zn(2+), metal ion transfer was observed from the iminodiacetate ligands to the high-affinity chelator, GST-(His)(6). The subsequent metal affinity precipitation of this homodimer resulted in operational problems. An equilibrium adsorption isotherm demonstrated the high affinity of GST-(His)(6) for immobilized Ni(2+), with a q(m) of 695 U mL(-1) (70 mg mL(-1)) and a K(d) of 0.089 U mL(-1) (0.0089 mg mL(-1)). Ni(2+)-loaded STREAMLINE chelating was therefore selected to purify GST-(His)(6) from unclarified E. coli homogenate, resulting in an eluted yield of 80% and a 3.34-fold purification. The high dynamic capacity in the expanded mode of 357 U mL(-1) (36 mg mL(-1)) demonstrates that this specific interaction was not affected by the presence of E. coli cell debris.
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Affiliation(s)
- R H Clemmitt
- Department of Chemical Engineering, University of Cambridge, Pembroke Street, Cambridge CB2 3RA, UK
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Garke G, Deckwer WD, Anspach FB. Preparative two-step purification of recombinant human basic fibroblast growth factor from high-cell-density cultivation of Escherichia coli. JOURNAL OF CHROMATOGRAPHY. B, BIOMEDICAL SCIENCES AND APPLICATIONS 2000; 737:25-38. [PMID: 10681038 DOI: 10.1016/s0378-4347(99)00394-1] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Aggregation and precipitation are major pitfalls during bioprocessing and purification of recombinant human basic fibroblast growth factor (rh-bFGF). In order to gain high yields of the soluble protein monomer with high biological activity, an efficient downstream process was developed, focussing on the combination of expanded bed adsorption (EBA) and heparin chromatography. After expression in E. coli TG1:plambdaFGFB, cells were harvested and washed; then the rh-bFGF was released via high pressure homogenization. The high viscosity of the feedstock of about 40 mPa s, showing non-newtonian behaviour, was reduced to 2 mPa s by the addition of DNase. The homogenate (5.6 l) was loaded directly on an expanded bed column (C-50) packed with the strong cation-exchanger Streamline SP. In the eluates, histone-like (HU) protein was identified as the main protein contaminant by sequence analysis. The thermodynamics and kinetics of rh-bFGF adsorption from the whole broth protein mixture were determined in view of competition and displacement effects with host-derived proteins. Optimal binding and elution conditions were developed with knowledge of the dependence of rh-bFGF adsorption isotherms on the salt concentration to allow direct application of eluates onto Heparin HyperD. This affinity support maintained selectivity and efficiency under CIP and over a wide range of flow-rates; both is advantageous for the flexibility of the purification protocol in view of a scalable process. Remaining DNA and HU protein were separated by Heparin HyperD. The endotoxin level decreased from approximately 1,000,000 EU/ml in the whole broth to 10 EU in 3 mg bFGF per ml. The final purification protocol yields >99% pure rh-bFGF as judged from SDS-PAGE and MALDI-TOF mass spectrometry with high mitogenic activity (ED50=1-1.5 ng/ml) of the lyophilized sample. In comparison to the conventional process, the overall protein recovery rose by 15% to 65% with saving time and costs.
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Affiliation(s)
- G Garke
- Biochemical Engineering Division, GBF-Gesellschaft für Biotechnologische Forschung mbH, Braunschweig, Germany
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Hearn MT. Physicochemical factors in polypeptide and protein purification and analysis by high-performance liquid chromatographic techniques: current status and challenges for the future. HANDBOOK OF BIOSEPARATIONS 2000. [DOI: 10.1016/s0149-6395(00)80050-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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