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Almeida C, Pedro AQ, Tavares APM, Neves MC, Freire MG. Ionic-liquid-based approaches to improve biopharmaceuticals downstream processing and formulation. Front Bioeng Biotechnol 2023; 11:1037436. [PMID: 36824351 PMCID: PMC9941158 DOI: 10.3389/fbioe.2023.1037436] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Accepted: 01/23/2023] [Indexed: 02/10/2023] Open
Abstract
The emergence of biopharmaceuticals, including proteins, nucleic acids, peptides, and vaccines, revolutionized the medical field, contributing to significant advances in the prophylaxis and treatment of chronic and life-threatening diseases. However, biopharmaceuticals manufacturing involves a set of complex upstream and downstream processes, which considerably impact their cost. In particular, despite the efforts made in the last decades to improve the existing technologies, downstream processing still accounts for more than 80% of the total biopharmaceutical production cost. On the other hand, the formulation of biological products must ensure they maintain their therapeutic performance and long-term stability, while preserving their physical and chemical structure. Ionic-liquid (IL)-based approaches arose as a promise alternative, showing the potential to be used in downstream processing to provide increased purity and recovery yield, as well as excipients for the development of stable biopharmaceutical formulations. This manuscript reviews the most important progress achieved in both fields. The work developed is critically discussed and complemented with a SWOT analysis.
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Affiliation(s)
- Catarina Almeida
- CICECO-Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, Aveiro, Portugal
| | - Augusto Q. Pedro
- CICECO-Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, Aveiro, Portugal
| | - Ana P. M. Tavares
- CICECO-Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, Aveiro, Portugal
| | - Márcia C. Neves
- CICECO-Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, Aveiro, Portugal
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Castro-Muñoz R, Serna-Vázquez J, García-Depraect O. Current evidence in high throughput ultrafiltration toward the purification of monoclonal antibodies (mAbs) and biotechnological protein-type molecules. Crit Rev Biotechnol 2021; 42:827-837. [PMID: 34538152 DOI: 10.1080/07388551.2021.1947182] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Pressure-driven membrane-based technologies, such as microfiltration (MF), ultrafiltration (UF), and nanofiltration (NF), have been successfully implemented in recovering different types of biomolecules and high-value-added compounds from various streams. Especially, UF membranes meet the requirements for separating specific bioproducts in downstream processes, e.g. monoclonal antibodies (mAbs), which are recognized as proteins produced mainly by plasma cells. According to the importance and functionality of the mAbs, their recovery is a current challenge with these bioseparations. Nevertheless, mAbs recovery using UF-assisted processes has been smartly performed over the last decade. To the best of our knowledge, there are no reviews of the reported developments using UF technology toward mAbs separation. Therefore, the goal of this paper is to collect and elucidate ongoing research studies implemented for the featured separation of mAbs and other biotechnological protein-type molecules (e.g. adenovirus serotype, extracellular vesicles, red fluorescent protein, cyanovirin-N, among others) via ultrafiltration-aided systems. The literature evidence (e.g. research papers, patents, etc.) has been analyzed and discussed according to the purpose of the study. Importantly, the relevant findings and novel approaches are discussed in detail. To finalize this document, the advantages, drawbacks, and guidelines in applying membrane-based techniques for such a recovery are presented.
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Affiliation(s)
- Roberto Castro-Muñoz
- Department of Process Engineering and Chemical Technology, Faculty of Chemistry, Gdansk University of Technology, Gdansk, Poland.,Tecnologico de Monterrey, Toluca de Lerdo, Mexico
| | - Julio Serna-Vázquez
- Tecnologico de Monterrey, Ciudad de México, Mexico.,Department of Human Genetics, McGill University, 3640 rue University, Montreal, Canada
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Sun L, Chen Q, Lu H, Wang J, Zhao J, Li P. Electrodialysis with porous membrane for bioproduct separation: Technology, features, and progress. Food Res Int 2020; 137:109343. [DOI: 10.1016/j.foodres.2020.109343] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2019] [Revised: 05/15/2020] [Accepted: 05/18/2020] [Indexed: 11/26/2022]
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Tan SH, Mohamedali A, Kapur A, Baker MS. Ultradepletion of human plasma using chicken antibodies: a proof of concept study. J Proteome Res 2013; 12:2399-413. [PMID: 23082986 DOI: 10.1021/pr3007182] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Human plasma arguably represents the most comprehensive version of the human proteome. Despite its immense theoretical discovery potential, plasma has many high and medium abundance proteins that mask low abundance protein disease biomarkers of relevance, making the discovery of novel diagnostic markers particularly difficult. Some form of protein depletion and/or fractionation is essential in order to detect markers of low abundance. Here, we describe a "proof of concept" two-pronged approach to immunodeplete abundant proteins from human plasma. The method, called API (Abundant Protein Immunodepletion), involves the fractionation of plasma using dual ion exchange columns (protein repetitive orthogonal offline fractionation (PROOF)) to simplify the proteome, the production of polyclonal IgY against each fraction and finally using the purified antibodies in a immunodepletion column. We explored the use of this product for immunodepletion of human plasma and identified a total of 165 nonredundant proteins after depletion. Of these, 38 proteins that were not previously identified in nondepleted plasma were now detected. It is envisaged that further optimization of the method as well as its cyclic implementation (by reinjecting depleted plasma into chickens for second round of antibody production) can make this technology highly robust, extremely cost-effective, and ideal for high throughput biomarker discovery.
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Affiliation(s)
- Sock-Hwee Tan
- Department of Chemistry and Biomolecular Sciences and Australian Proteome Analysis Facility, Macquarie University, Sydney, NSW 2109, Australia
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Jian-Hua ZXGC, Lu-Yin Y, Li T, Min W, Dai-Shuang C. Separation and isolation of fusion protein using a new native preparative PAGE device. J Chromatogr Sci 2012; 50:820-5. [PMID: 22718746 DOI: 10.1093/chromsci/bms077] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
A human serum albumin and Thymosin α1 (HSA-Tα1) fusion protein was designed and over-expressed in Pichia pastoris. To purify the fusion protein, a new native preparative electrophoresis system that involved a modified device with a sample receiving chamber, and an assay method with Coomassie Blue G-250 tracing the collection of the protein of interest. In this device, two gels were run in parallel: native vertical collecting polyacrylamide gel electrophoresis (PAGE) and native vertical tracing PAGE. Samples mixed with or without Coomassie Blue G-250 loading buffer were separately loaded to the two aforementioned gels, and the fractions were collected until the tracing protein band combined with dye reached 1 cm from the sample-receiving chamber at the bottom of the gel. Approximately nine fractions were collected at regular intervals of 15 min. HSA-Tα1 fusion protein with 95% relative homogeneity was harvested and manifested similar immunological activities as synthetic Tα1 after a single-step purification of this preparative PAGE. As a result, this system offers a new, rapid and simple method for the purification of the protein of interest.
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Affiliation(s)
- Zhang Xin-Guo Chen Jian-Hua
- College of Life Science and Technology, China Pharmaceutical University, Nanjing, 210009, People's Republic of China.
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George DA, Stuckey DC. Extraction of monoclonal antibodies (IgG1) using anionic and anionic/nonionic reverse micelles. Biotechnol Prog 2010; 26:1352-60. [DOI: 10.1002/btpr.453] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Kasicka V. From micro to macro: conversion of capillary electrophoretic separations of biomolecules and bioparticles to preparative free-flow electrophoresis scale. Electrophoresis 2009; 30 Suppl 1:S40-52. [PMID: 19517515 DOI: 10.1002/elps.200900156] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
This invited contribution in the special issue of Electrophoresis published in celebration of the 30th Anniversary of this journal reflects the impact of our milestone paper [Prusík, Z., Kasicka, V., Mudra, P., Stepánek, J., Smékal, O., Hlavácek, J., Electrophoresis 1990, 11, 932-936] in the area of conversion of microscale analytical and micropreparative CE separations of biomolecules and bioparticles into (macro)preparative free-flow electrophoresis (FFE) scale on the basis of a correlation between CE and FFE methods. In addition to the survey of advances in the relatively narrow field of CE-FFE correlation and CE-FFE conversion, a comprehensive review of the recent developments of micropreparative CE and (macro)preparative FFE techniques is also presented and applications of these techniques to micro- and (macro)preparative separations and purifications of biomolecules and bioparticles are demonstrated. The review covers the period since the year of publication of the above paper, i.e. ca. the last 20 years.
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Affiliation(s)
- Václav Kasicka
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Prague, Czech Republic.
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Roque ACA, Silva CSO, Taipa MA. Affinity-based methodologies and ligands for antibody purification: Advances and perspectives. J Chromatogr A 2007; 1160:44-55. [PMID: 17618635 DOI: 10.1016/j.chroma.2007.05.109] [Citation(s) in RCA: 187] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2006] [Revised: 05/25/2007] [Accepted: 05/29/2007] [Indexed: 11/24/2022]
Abstract
Many successful, recent therapies for life-threatening diseases such as cancer and rheumatoid arthritis are based on the recognition between native or genetically engineered antibodies and cell-surface receptors. Although naturally produced by the immune system, the need for antibodies with unique specificities and designed for single application, has encouraged the search for novel antibody purification strategies. The availability of these products to the end-consumer is strictly related to manufacture costs, particularly those attributed to downstream processing. Over the last decades, academia and industry have developed different types of interactions and separation techniques for antibody purification, affinity-based strategies being the most common and efficient methodologies. The affinity ligands utilized range from biological to synthetic designed molecules with enhanced resistance and stability. Despite the successes achieved, the purification "paradigm" still moves interests and efforts in the continuous demand for improved separation performances. This review will focus on recent advances and perspectives in antibody purification by affinity interactions using different techniques, with particular emphasis on affinity chromatography.
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Affiliation(s)
- Ana C A Roque
- IBB-Institute for Biotechnology and Bioengineering, Centro de Engenharia Biológica e Química, Instituto Superior Técnico, Avenida Rovisco Pais, 1049-001 Lisboa, Portugal
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Rapid Characterization of Monoclonal Antibodies using the Piezoelectric Immunosensor. SENSORS 2007. [DOI: 10.3390/s7030341] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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10
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Catzel D, Chin DY, Stanton PG, Gray PP, Mahler SM. Fractionation of follicle stimulating hormone charge isoforms in their native form by preparative electrophoresis technology. J Biotechnol 2006; 122:73-85. [PMID: 16198015 DOI: 10.1016/j.jbiotec.2005.08.026] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2005] [Revised: 08/02/2005] [Accepted: 08/24/2005] [Indexed: 11/29/2022]
Abstract
Complex glycoprotein biopharmaceuticals, such as follicle stimulating hormone (FSH), erythropoietin and tissue plasminogen activator consist of a range of charge isoforms due to the extent of sialic acid capping of the glycoprotein glycans. Sialic acid occupies the terminal position on the oligosaccharide chain, masking the penultimate sugar residue, galactose from recognition and uptake by the hepatocyte asialoglycoprotein receptor. It is therefore well established that the more acidic charge isoforms of glycoprotein biopharmaceuticals have higher in vivo potencies than those of less acidic isoforms due to their longer serum half-life. Current strategies for manipulating glycoprotein charge isoform profile involve cell engineering or altering bioprocesss parameters to optimise expression of more acidic or basic isoforms, rather than downstream separation of isoforms. A method for the purification of a discrete range of bioactive recombinant human FSH (rhFSH) charge isoforms based on Gradiflowtrade mark preparative electrophoresis technology is described. Gradiflowtrade mark electrophoresis is scaleable, and incorporation into glycoprotein biopharmaceutical production bioprocesses as a potential final step facilitates the production of biopharmaceutical preparations of improved in vivo potency.
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Affiliation(s)
- Dallia Catzel
- Bioengineering Centre, School of Biotechnology and Biomolecular Sciences, University of New South Wales, Sydney, Australia
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Wang K, Johnson A, Obradovic M, Anderson G, Maclean C, Nair H. TSE clearance during plasma products separation process by Gradiflow™. Biologicals 2005; 33:87-94. [PMID: 15939286 DOI: 10.1016/j.biologicals.2005.01.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2004] [Revised: 01/13/2005] [Accepted: 01/19/2005] [Indexed: 10/25/2022] Open
Abstract
BACKGROUND AND OBJECTIVES Recent experimental evidence from rodent models suggests a potential risk for transmissible spongiform encephalopathy (TSE) transmission by blood. The emergence of a new variant Creutzfeldt-Jakob disease (vCJD) has raised increased concerns about the safety of blood components and plasma products derived from vCJD-infected donors. Recent risk-minimisation strategies have included a ban on the use of UK-sourced plasma for the preparation of licensed blood products and leukodepletion of blood donations for fear of possible transmission of the human TSE via blood or blood components. The aim of this study was to investigate the capability and efficacy of a preparative electrophoresis system (Gradiflow) in the removal of TSE contaminants during the separation of plasma products. MATERIALS AND METHODS Using hamster adapted scrapie 263 K as a model for TSE agent, albumin and IgG separation from human plasma by Gradiflow were performed separately by spiking a 263 K scrapie microsomal fraction to the feed material at each process step. Samples from pre- and post-Gradiflow separation process were titrated to the end-point for the detection of the disease-associated, proteinase K resistant form of the pathogenic prion protein (PrP(Sc)) by Western blot. RESULTS Under all conditions tested, a greater than 3 log(10) reduction was achieved with no PrP(Sc) detected in any of the pooled products for either of the IgG or albumin separations. These data show that Gradiflow processing has clear advantages for concurrent purification of plasma products and in-process TSE removal. CONCLUSIONS Our findings suggest that Gradiflow process is a viable alternative to remove causative TSE agents during plasma products separation, potentially eliminating the risk of TSE agents transmission.
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Affiliation(s)
- Kailing Wang
- Commercial Separations Division, Gradipore, NSW 2086, Australia.
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Evtushenko M, Wang K, Stokes HW, Nair H. Blood protein purification and simultaneous removal of nonenveloped viruses using tangential-flow preparative electrophoresis. Electrophoresis 2005; 26:28-34. [PMID: 15624167 DOI: 10.1002/elps.200406150] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Gradiflow is new technology allowing purification of important blood proteins from viral contaminated plasma. Protein purification is based on unique scalable tangential-flow preparative electrophoresis, and is distinct from current technology because protein purification and virus removal are performed in the same step. This one-step removal and purification exploits both the size and charge of target proteins. The medically important blood proteins, immunoglobulin G (IgG) and alpha-1-antitrypsin, were chosen to demonstrate the ability of this process to purify proteins from contaminated plasma. Clearance factors achieved by infectivity assays and polymerase chain reaction (PCR) that meet regulatory requirements demonstrated removal of canine parvovirus (CPV). CPV is a model virus for pathogenic nonenveloped viruses, including parvovirus B19, not adequately removed or inactivated by most processes currently in practice. The recovery of proteins from plasma with high purity, recovery, and function, while simultaneously removing viruses, provides blood products with a level of purity compatible with clinical use more quickly and cheaply than available techniques.
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Affiliation(s)
- Michael Evtushenko
- Department of Biological Sciences, Macquarie University, NSW, Australia.
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10 Free-flow isoelectric focusing. ACTA ACUST UNITED AC 2005. [DOI: 10.1016/s0149-6395(05)80013-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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Abstract
In this article the unique capability of elastin-like protein (ELP) to reversibly precipitate was combined with the high affinity and specificity of antibody-binding domains such as Protein G, Protein L, or Protein LG as a general method for antibody purification that combines in a unique manner the simplicity and robustness of temperature-triggered precipitation with the selectivity of affinity interactions. In a single precipitation step, antibodies derived from different sources (animal sera or hybridoma cell cultures) were selectively recovered by a simple temperature trigger. Due to the versatility of the binding ligands toward different classes of antibodies, we believe that this technology will be useful as an economical, highly efficient, and universal platform for the purification of antibodies.
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Affiliation(s)
- Jae-Young Kim
- Department of Chemical and Environmental Engineering, University of California, Riverside, California 92521,USA
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Coleman L, Mahler SM. Purification of Fab fragments from a monoclonal antibody papain digest by Gradiflow electrophoresis. Protein Expr Purif 2003; 32:246-51. [PMID: 14965770 DOI: 10.1016/j.pep.2003.07.005] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2003] [Revised: 07/25/2003] [Indexed: 11/30/2022]
Abstract
Fab fragments isolated from papain digests of monoclonal antibodies have a wide variety of uses in analytical and in both in vivo and in vitro diagnostic applications. A novel, non-affinity method which uses the Gradiflow to purify Fab fragments from the papain digest of a mouse IgG1 anti-c-myc monoclonal antibody is described. The Gradiflow is a preparative electrophoresis instrument that uses polyacrylamide membranes of known pore size to separate proteins in solution in their native state under mild pH conditions by charge or size. The Fab and Fc fragments from the papain digestion were characterized using isoelectric focusing (IEF) and non-reducing SDS-PAGE in conjunction with IEF and Western blot. There were three Fab isoforms with p [Formula: see text] between pH 6.5 and 7.4 while the Fc had a range of isoforms between 6.1 and 6.3. Both Fab and Fc fragments had similar [Formula: see text] of 50kDa. A charge-based purification strategy was developed to obtain a high purity Fab preparation after 10min, confirmed by Western blot and chemiluminescence analyses. A small quantity of residual undigested IgG1 remained and was removed using a size-based separation. The efficiency of the separation despite the narrow pH range between Fab and Fc suggests that this technique may be an alternative to protein A or G affinity separation of Fc and Fab monoclonal antibody fragments from papain digests of monoclonal antibodies.
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Affiliation(s)
- Lynette Coleman
- Bioengineering Centre, School of Biotechnology and Biomolecular Sciences, University of New South Wales, Sydney, NSW 2052, Australia
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Cheung GLM, Thomas TM, Rylatt DB. Purification of antibody Fab and F(ab′)2 fragments using Gradiflow technology. Protein Expr Purif 2003; 32:135-40. [PMID: 14680950 DOI: 10.1016/s1046-5928(03)00219-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2003] [Revised: 07/01/2003] [Indexed: 10/27/2022]
Abstract
The Gradiflow, a preparative electrophoresis instrument designed to separate molecules on the basis of their size and charge, was used to purify antibody Fab and F(ab')2 fragments. The method described is charge based, utilizing the difference in the pI between the antibody Fab/F(ab')2 fragments and antibody Fc fragments that occur after enzyme digestion of whole antibody molecules. This method of purification was successful across a range of monoclonal and polyclonal antibodies. In particular, F(ab')2 fragments were purified from a number of mouse monoclonal antibodies (both IgG1 and IgG2a isotypes) and Fab fragments were purified from egg yolk IgY polyclonal antibodies. This is a rapid purification method which has advantages over alternative methods that usually comprise ion exchange and gel filtration chromatography. This method may be applicable to most antibody digest preparations.
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Gee SC, Bate IM, Thomas TM, Rylatt DB. The purification of IgY from chicken egg yolk by preparative electrophoresis. Protein Expr Purif 2003; 30:151-5. [PMID: 12880762 DOI: 10.1016/s1046-5928(03)00076-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Chicken IgY has been purified from egg yolk by preparative electrophoresis on the Gradiflow, a system which has been employed for the purification of a wide range of proteins with high recovery and biological activity. Protein purification on the Gradiflow utilises electrophoresis with selected combinations of porous membranes and buffers. The purification of IgY was achieved by initial PEG lipid precipitation, then a single step Gradiflow run by a strategy based on the relatively high pI range of IgY compared to other egg yolk proteins. The IgY yields obtained from the delipidised supernatant are consistently greater than 80% by immunoassay. The purity of the IgY fraction compared favourably with IgY prepared using three commercial products.
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Affiliation(s)
- Sarah C Gee
- Gradipore Ltd, 22 Rodborough Road, P.O. Box 6126, Frenchs Forest, 2086 NSW, Australia
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Ogle D, Sheehan M, Rumbel B, Gibson T, Rylatt DB. Design of a new, twelve-channel electrophoretic apparatus based on the Gradiflow technology. J Chromatogr A 2003; 989:65-72. [PMID: 12641283 DOI: 10.1016/s0021-9673(02)01525-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The Gradiflow technology, originally designed to carry out binary, size-based and charge sign-based electrophoretic protein separations, has been extended to simultaneously obtain multiple protein fractions from a single electrophoretic separation. The separation unit of the new apparatus houses the anode and cathode compartments and up to twelve shallow separation compartments through which the background electrolyte solution that contains the separated protein fractions is recirculated. The separation compartments are formed from grids as thin as 1.2 mm and polyacrylamide membranes as thin as 0.15 mm, all with corresponding multiple inlet and outlet ports. The average pore size of the polyacrylamide membranes can be varied to permit passage of proteins in the 5000-800 000 molecular mass range. The electric field, orthogonal to the flow paths of the recirculated background electrolyte, selectively moves the sample components across the polyacrylamide separation membranes. Selective protein transport can be achieved by exploiting differences in either the relative size of the proteins or the charge sign of the proteins. The advantages of the new apparatus stem from the synergistic combination of the short electrophoretic transfer distances, high electric field strength, large effective surface areas of the separation membranes, and the great flexibility with which apparati containing one to twelve separation compartments can be created.
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Affiliation(s)
- David Ogle
- Gradipore Ltd., 22 Rodborough Road, P.O. Box 6126, French's Forest, NSW 2086, Australia
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Abstract
The new Gradiflow BF200 IET unit, developed for isoelectric trapping protein separations has been modified and used to carry out preparative-scale enantiomer separations. Hydroxypropyl beta-cyclodextrin was used as the chiral resolving agent to induce an isoelectric point difference between the enantiomers. Three isoelectric membranes with isoelectric points below, in between and above the isoelectric points of the complexed enantiomers were used to trap the separated enantiomers in the anodic and cathodic separation compartments of the Gradiflow BF200 IET apparatus, respectively. The production rates were about 15 times higher than those previously obtained with another isoelectric trapping device and about 30% higher than those obtained in a continuous free-flow electrophoretic device operated in the isoelectric focusing mode. The remarkable separation speed observed in the modified Gradiflow BF200 IET unit is attributed to the favorable interplay of the short electrophoretic transfer distance, the high electric field strength and the large effective surface areas of the isoelectric membranes.
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Affiliation(s)
- Evan Shave
- Department of Chemistry, MS 3255, Texas A&M University, PO Box 30012, College Station, TX 77842-3012, USA
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Thomas TM, Quindere J, Thomas DE, Gee SC, Bate IM, Rylatt DB. Preparation of monoclonal antibodies using the electrophoresis separation instrument, Gradiflow. HYBRIDOMA AND HYBRIDOMICS 2003; 22:47-53. [PMID: 12713690 DOI: 10.1089/153685903321538080] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Gradiflow, a preparative electrophoresis separation device, was utilized to develop and test generic protocols for the preparation of monoclonal antibodies (MAbs) from tissue culture supernatant and ascites fluid. The charge based protocol separated the high pI antibodies from the lower isoelectric points (pI) contaminants by either moving the antibody (ascites fluid) or contaminants (tissue culture supernatant) through a polyacrylamide separation membrane. A total of 60 separations were performed with tissue culture supernatant, and a further 30 separations with ascites fluid. The Gradiflow procedure resulted in higher yields, equivalent functionality and similar purity compared with affinity chromatography antibody preparation on protein A and G. The results suggest that the Gradiflow protocols may be an alternative method of antibody preparation for these samples.
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Affiliation(s)
- T M Thomas
- Gradipore Ltd., 22 Rodborough Rd., Frenchs Forest, NSW 2086 Australia.
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Verdoliva A, Pannone F, Rossi M, Catello S, Manfredi V. Affinity purification of polyclonal antibodies using a new all-D synthetic peptide ligand: comparison with protein A and protein G. J Immunol Methods 2002; 271:77-88. [PMID: 12445731 DOI: 10.1016/s0022-1759(02)00341-1] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
This study investigates the applicability of the protein A Mimetic (PAM) affinity ligand, obtained from the screening of a multimeric combinatorial peptide library, in immunoglobulin isolation from serum. To avoid protease degradation, the ligand has been substituted by its inverso form, named D-PAM, synthesized by replacing all amino acids with the corresponding D derivatives. D-PAM affinity columns, prepared by immobilizing the all-D peptide on the commercially available support Emphaze, were able to capture IgG directly from the serum in a single chromatographic step, with a recovery yield ranging from 60% to 90%, a purity degree higher than 90%, and with a full recovery of antibody activity. Column capacity, determined by applying a large excess of purified IgG to 1 ml bed volume column, was close to 52 mg/ml for bovine IgG, 58 mg/ml for goat IgG, 66 mg/ml for horse IgG, 50 mg/ml for human IgG, 52 mg/ml for mouse IgG, 36 mg/ml for rabbit IgG and 48 mg/ml for sheep IgG. D-PAM peptide was found to be very stable to protease activity, and after prolonged incubation with mouse serum. Similarly, the corresponding derivatized matrix tested before and after various treatments, including sanitization and autoclaving procedures maintained its IgG binding properties, thus indicating a very high stability in terms of ligand leakage and degradation.
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Affiliation(s)
- Antonio Verdoliva
- TECNOGEN S.C.p.A., Parco Scientifico, 81015 Piana di Monte Verna (CE), Italy.
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Ogle D, Ho A, Gibson T, Rylatt D, Shave E, Lim P, Vigh G. Preparative-scale isoelectric trapping separations using a modified Gradiflow unit. J Chromatogr A 2002; 979:155-61. [PMID: 12498244 DOI: 10.1016/s0021-9673(02)01601-1] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The Gradiflow BF200 preparative electrophoretic unit (Gradipore), which has been developed for size-based and charge-sign-based protein separations and in which the hydraulic flow path of the recirculating sample stream in the separation cartridge is orthogonal to the electric field, has been modified to carry out binary protein separations using the principles of isoelectric trapping. The disposable separation cartridge contained three isoelectric membranes which, along with the cartridge holder, formed the anode and cathode compartments and the anodic and cathodic separation compartments. The utility of the modified instrument was demonstrated by effecting a binary separation of chicken egg white across an isoelectric point 5.5 isoelectric membrane. The desalting and subsequent binary separation steps proved to be remarkably rapid, due to the favorable combination of short electrophoretic path, high electric field strength and large effective isoelectric membrane surface area.
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Affiliation(s)
- David Ogle
- Gradipore, French's Forest, NSW 2086, Australia
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Li G, Stewart R, Conlan B, Gilbert A, Roeth P, Nair H. Purification of human immunoglobulin G: a new approach to plasma fractionation. Vox Sang 2002; 83:332-8. [PMID: 12437520 DOI: 10.1046/j.1423-0410.2002.00241.x] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
BACKGROUND AND OBJECTIVES Currently, plasma fractionation involves multiple processing steps using established methods such as ethanol precipitation and column chromatography. The known limitations associated with conventional purification techniques, combined with strict regulations on safety and high demand for particular plasma proteins, have resulted in a shortage of plasma-derived therapeutics such as intravenous immunoglobulin G (IgG). MATERIALS AND METHODS In this study, IgG was purified from human plasma using Gradiflow technology, an electrophoresis-based separation technology. RESULTS IgG was isolated from plasma to high purity, with 94 +/- 5% recovery in a short processing time. CONCLUSIONS The technology has been shown to be linearly scalable and has the capacity to contribute to increased production of important plasma fraction therapeutics.
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Affiliation(s)
- G Li
- Gradipore Ltd, Frenchs Forest 2086, Sydney, Australia
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