WO2022203044A1 - ウイルスクリアランス試験の方法 - Google Patents
ウイルスクリアランス試験の方法 Download PDFInfo
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- WO2022203044A1 WO2022203044A1 PCT/JP2022/014401 JP2022014401W WO2022203044A1 WO 2022203044 A1 WO2022203044 A1 WO 2022203044A1 JP 2022014401 W JP2022014401 W JP 2022014401W WO 2022203044 A1 WO2022203044 A1 WO 2022203044A1
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Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
- C12Q1/70—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving virus or bacteriophage
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
- C12Q1/02—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving viable microorganisms
- C12Q1/22—Testing for sterility conditions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/10—Testing of membranes or membrane apparatus; Detecting or repairing leaks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/02—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor characterised by their properties
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/33—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using ultraviolet light
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N2750/00—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA ssDNA viruses
- C12N2750/00011—Details
- C12N2750/14011—Parvoviridae
- C12N2750/14311—Parvovirus, e.g. minute virus of mice
- C12N2750/14321—Viruses as such, e.g. new isolates, mutants or their genomic sequences
Definitions
- the present invention relates to a virus clearance test method.
- Preparations containing biological substances include plasma derivatives purified from blood and biological preparations produced by biotechnology. There is a risk of viral contamination in these biologic-containing formulations. In general, biomaterial-containing preparations must be guaranteed to be safe against viruses. Therefore, in the production of biological substance-containing preparations, it is necessary to include a step of sufficiently removing or inactivating the virus contained in or possibly contained in the biological substance-containing preparation, that is, a virus removal step (for example, non-patented Reference 1). Testing the virus removal or inactivation ability in the virus removal process is called virus clearance test.
- a virus removal step for example, non-patented Reference 1
- a treatment step using a virus-removing medium such as a virus-removing membrane is superior in that it can be performed for all viruses regardless of the presence or absence of an envelope.
- virus clearance tests in the manufacturing process of biological material-containing preparations measure the virus concentration before and after any manufacturing process, and evaluate the virus clearance ability by calculating the logarithmic reduction rate (LRV), for example (e.g., See Non-Patent Document 1).
- LUV logarithmic reduction rate
- the virus clearance ability of the virus removal step is evaluated by mixing the biological substance-containing solution and the virus solution and measuring the virus concentration in the mixture before and after contacting the mixture with the virus removal medium.
- a useful non-specific model virus is an "animal parvovirus" (see, for example, Non-Patent Document 1).
- MMV murine minute virus
- PV porcine parvovirus
- infectivity titration methods including endpoint assay methods and local focus calculation assay methods, and quantitative PCR (Quantitative-Polymerase Chain Reaction: qPCR) methods are mainly used.
- quantitative PCR Quantitative-Polymerase Chain Reaction: qPCR
- one object of the present invention is to provide a virus clearance test method applicable to continuous processes.
- a protein solution is supplied to a first flow path provided with a protein purification section upstream and a virus removal filter downstream, and the protein solution is flowed to the protein purification section at a first constant velocity. and (b) supplying the virus solution at a second constant velocity to the second channel connected between the protein purification part of the first channel and the virus removal filter, and adding the virus solution to the purified protein solution. are mixed in the first channel, (c) the mixture of the protein solution and the virus solution is passed through the virus removal filter at a third constant velocity, and (d) mixing permeates the virus removal filter. measuring the virus contained in the liquid permeate.
- C (m 2 ) is the membrane area of the virus removal filter
- D min is the minimum value of b/(a+b)
- D max is the maximum value of b/(a+b)
- F min (LMH) is the value
- F max (LMH) is the maximum flux of the permeated liquid in the virus removal filter
- [18] further comprising comparing the amount of virus contained in the mixed liquid before passing through the virus removal filter and the amount of virus contained in the permeated liquid of the mixed liquid that has passed through the virus removal filter, [1 ] to [17].
- FIG. 1 is a schematic diagram of a protein purification system according to an embodiment
- FIG. 4 is a table showing purification conditions according to Examples 1 to 6.
- FIG. 4 is a table showing purification results according to Examples 1 to 6.
- FIG. 1 is a schematic diagram of a protein purification system according to Comparative Example 1.
- FIG. 3 is a table showing purification conditions according to Comparative Examples 1 to 3.
- FIG. 4 is a table showing purification results according to Comparative Examples 1 to 3.
- FIG. 10 is a schematic diagram of a protein purification system according to Comparative Example 4; 10 is a table showing purification conditions according to Comparative Examples 4 to 9.
- FIG. 10 is a table showing purification results according to Comparative Examples 4 to 9.
- FIG. 10 is a table showing purification results according to Comparative Examples 4 to 9.
- the protein purification system as shown in FIG.
- a virus removal filter 12 provided downstream and a second channel 20 connected between the protein purification section 11 of the first channel 10 and the virus removal filter 12 are provided.
- the first flow path 10 may be provided with a first pump 13 for flowing the protein solution to the protein purification section 11 at a first constant velocity.
- a second pump 21 for flowing the virus solution at a second constant velocity may be provided in the second channel 20 .
- the method of the virus clearance test method according to the embodiment is performed using, for example, the protein purification system shown in FIG.
- the method of the virus clearance test according to the embodiment includes (a) supplying a protein solution to a first channel 10 having a protein purification section 11 upstream and a virus removal filter 12 downstream; (b) flow the protein solution through the protein purification unit 11 at a constant speed; supplying a virus solution at a constant speed, mixing the purified protein solution with the virus solution in the first channel 10; (d) measuring the virus contained in the permeate of the mixture that has passed through the virus removal filter 12;
- the protein solution that flows through the first channel 10 contains protein.
- the protein solution is preferably virus-free.
- a protein solution is flowed from the protein solution tank 41 to the first channel 10, for example.
- the first pump 13 is provided, for example, upstream of the protein purification section 11 in the first channel 10, but is not limited to this.
- a positive displacement pump can be used as the first pump 13, but is not limited to this.
- volumetric pumps include, but are not limited to, peristaltic pumps.
- the first pump 13 continuously flows the protein solution to the protein purification section 11 at a first constant velocity.
- proteins examples include antibodies.
- Antibodies as commonly defined in biochemistry, are glycoprotein molecules (also called gamma globulin or immunoglobulin) produced by B lymphocytes as a defense mechanism in vertebrates.
- B lymphocytes as a defense mechanism in vertebrates.
- antibodies can be used as human pharmaceuticals and have substantially the same structure as antibodies in the human body to which they are administered.
- the antibody may be a human antibody, or a non-human mammal-derived antibody such as bovine or mouse.
- antibodies may be chimeric antibodies with human IgG, and humanized antibodies.
- a chimeric antibody with human IgG is an antibody in which the variable region is derived from a non-human organism such as a mouse, but other constant regions are replaced with a human-derived immunoglobulin.
- a humanized antibody is a variable region in which the complementarity-determining region (CDR) is derived from a non-human organism, but the other framework regions (FR) are derived from humans. an antibody. Humanized antibodies are even less immunogenic than chimeric antibodies.
- the antibody class (isotype) and subclass are not limited.
- antibodies are classified into five classes, IgG, IgA, IgM, IgD, and IgE, depending on differences in the structure of their constant regions.
- antibodies can be of any of the five classes.
- IgG has four subclasses, IgG1 to IgG4, and IgA has two subclasses, IgA1 and IgA2.
- antibodies can be of any subclass.
- Antibodies may also include antibody-related proteins such as Fc fusion proteins in which a protein is bound to the Fc region.
- Antibodies can be classified according to their origin. However, antibodies may be any of natural human antibodies, recombinant human antibodies produced by gene recombination technology, monoclonal antibodies, and polyclonal antibodies. From the viewpoint of demand and importance as an antibody drug, human IgG is suitable as an antibody, but is not limited to this.
- the protein purification unit 11 removes impurities contained in the protein and purifies the protein contained in the protein solution.
- the protein purification section 11 is equipped with, for example, a chromatography column.
- the chromatography column may be, for example, a cation exchange chromatography column.
- protein aggregates such as antibody multimers are adsorbed to the cation exchange carrier as impurities, and proteins such as antibody monomers permeate the cation exchange chromatography column.
- the cation exchange carrier has cation exchange groups.
- the cation exchange groups may be strong cation exchange groups, weak cation exchange groups, or both.
- the strong cation exchange group is charged in the pH range of the antibody solution, so the amount of charge is constant. Therefore, when the cation exchange carrier has a strong cation exchange group, a constant or more charge amount is always guaranteed. Therefore, when the cation exchange carrier has a strong cation exchange group, the charge amount change with respect to pH is suppressed, and the reproducibility of purification characteristics can be improved.
- strong cation exchange groups include sulfonic acid groups.
- the weak cation exchange group can change the amount of charge depending on the pH of the mobile phase. Therefore, the charge density of the cation exchange carrier can be adjusted by changing the pH of the mobile phase. Therefore, any impurities can be removed by adjusting the pH according to the characteristics of the impurities to be removed.
- weak cation exchange groups include carboxyl groups, phosphonic acid groups, and phosphate groups.
- Examples of the shape of the cation exchange carrier include, but are not limited to, membrane, bead, and monolith.
- membrane-like cation exchange carriers examples include MustangTM S (Pall Corporation), SartobindTM S (Sartorius Stedim Biotech), and Natrix HD-Sb, Natrix HD-C (Natrix Separations). but not limited to these.
- beaded cation exchange carriers examples include SP SepharoseTM Fast Flow, High Performance, XL, CaptoTM S (GE Healthcare), Fractogel® COO ⁇ , SO 3 ⁇ , SE Highcap, Eshumuno ®S, CPX (Merck Millipore Corporation), POROS® XS, HS (ThermoFisher), NuviaTM S, HR-S, UNOsphereTM S, Rapid S, Macro-PrepTM ) High S, CM, 25 S (Bio-Rad), and Cellufine® Max CM, Max S (JNC), Cellufine® DexS-HbP (JNC).
- monolithic cation exchange carriers examples include, but are not limited to, CIM (registered trademark) SO3 (BIA Separations).
- the chromatography column may be, for example, an anion exchange chromatography column.
- impurities with low isoelectric points such as host cell-derived proteins (HCP), nucleic acids, and viruses are adsorbed to the anion exchange carrier, and proteins such as antibody monomers are absorbed by the anion exchange chromatography column. pass through.
- HCP host cell-derived proteins
- the anion exchange carrier has an anion exchange group.
- the anion exchange groups may be strong anion exchange groups, weak anion exchange groups, or both.
- strong anion exchange groups include quaternary ammonium having a trimethylamino group, a triethylamino group, or the like.
- weak anion exchange groups include, but are not limited to, tertiary amines.
- a tertiary amine having two or more alkyl groups having two or more carbon atoms can have moderate hydrophobicity.
- Examples of tertiary amines include diethylamino, dipropylamino, diisopropylamino, and dibutylamino groups.
- anion exchange carrier examples include, but are not limited to, membrane, bead, and monolith.
- membranous anion exchange carriers examples include ChromasorbTM (Merck Millipore Corporation), MustangTM Q (Pall Corporation), SarotibindTM Q, STICTM PA (Sartorius Stedim Biotech). , NatriFlo® HD-Q (Natrix Separations), and QyuSpeedTM D (Asahi Kasei Medical Corp.).
- beaded anion exchange carriers examples include Q SepharoseTM Fast Flow, High Performance, XL, QAE SephadexTM (GE Healthcare), FractogelTM TMAE, TMAE Highcap, DMAE, DEAE, Eshmuno ( Registered trademark) Q (Merck Millipore Corporation), POROS® XQ, HQ, D, PI (ThermoFisher), DEAE-Cellulose (Sigma-Aldrich), NuviaTM Q, UNOsphereTM Q, Macro-Prep (registered trademark) High Q, DEAE, 25 Q (Bio-Rad), CaptoQ (GE Healthcare Japan Ltd.), Cellufine (registered trademark) Max DEAE, and Max Q (JNC) not.
- monolithic anion exchange carriers include, but are not limited to, CIM (registered trademark) QA, DEAE, and EDA (BIA Separations).
- the chromatography column may be, for example, a mixed-mode chromatography column.
- Mixed-mode chromatography columns combine reverse-phase chromatography and ion-exchange chromatography to purify protein solutions.
- Carriers used in mixed mode chromatography include Cellufine MAX IB (JNC).
- the protein purification unit 11 may or may not have virus removal ability.
- the logarithmic removal rate (LRV) in the protein purification unit 11 may be, for example, 0 or more and 7 or less.
- the lower limit of LRV in the protein purification unit 11 may be 0 or more, 1 or more, 2 or more, 3 or more, 4 or more, or 5 or more.
- the upper limit of LRV in the protein purification unit 11 may be 7 or less, or 6 or less.
- a protein concentration measuring device 31 that measures the protein concentration of the protein solution that has passed through the protein purification section 11 may be provided downstream of the protein purification section 11 in the first flow path 10 .
- the protein concentration measuring device 31 measures the protein concentration of the protein solution that has passed through the protein refining section 11 by, for example, an ultraviolet absorption method.
- a conductivity measuring device 32 that measures the conductivity of the protein solution that has passed through the protein purification section 11 may be provided downstream of the protein purification section 11 in the first flow path 10 .
- the conductivity measuring device 32 measures the conductivity of the protein solution that has passed through the protein purification section 11 by, for example, an AC two-electrode method or an electromagnetic induction method.
- a pH meter for measuring the pH of the protein solution that has passed through the protein purification section 11 Downstream of the protein purification section 11 in the first flow path 10, a pH meter for measuring the pH of the protein solution that has passed through the protein purification section 11, a thermometer for measuring temperature, and a pressure gauge for measuring pressure are provided.
- the virus solution that flows through the second channel 20 contains viruses.
- the virus solution is flowed from the virus solution tank 42 to the second channel 20, for example.
- a volumetric pump can be used as the second pump 21, but is not limited to this.
- volumetric pumps include, but are not limited to, peristaltic pumps.
- the second pump 21 continuously flows the virus solution through the second channel 20 at a second constant velocity. Since the second channel 20 is connected to the first channel 10, the protein solution and the virus solution are mixed downstream of the first channel 10 from the connection point between the second channel 20 and the first channel 10. , becomes a mixture.
- An in-line mixer 33 may be provided downstream of the first flow path 10 from the connection point between the second flow path 20 and the first flow path 10 . An in-line mixer 33 facilitates mixing of the protein and virus solutions.
- the virus can be an infectious virus.
- the virus can be a naturally occurring virus.
- the naturally-occurring virus includes a virus obtained by culturing a virus-infected host cell in a medium, and a virus obtained by transfecting a cell with a viral nucleic acid and culturing the cell.
- viruses examples include Minutevirus of Mouse (MVM), Porcine Parvovirus (PPV), ReoVirus Type 3, PolioVirus, Pseudorabies Virus, Herpes Simplex Virus type 1 (Human Herpes Virus 1), xenotropic murine leukemia virus (X-MuLV), and bovine viral diarrhea virus (Bovine Viral Diarrhea Virus), but are not limited thereto.
- MMV Minutevirus of Mouse
- PDV Porcine Parvovirus
- ReoVirus Type 3 PolioVirus
- Pseudorabies Virus Herpes Simplex Virus type 1
- Herpes Simplex Virus type 1 Human Herpes Virus 1
- X-MuLV xenotropic murine leukemia virus
- bovine viral diarrhea virus Bovine Viral Diarrhea Virus
- the virus solution supplied to the second channel 20 contains the same protein as the protein solution supplied to the first channel 10 contains.
- the protein concentration in the virus solution supplied to the second channel 20 is the same as the protein concentration in the protein solution supplied to the first channel 10 .
- the protein concentration in the mixture of the protein solution and the virus solution becomes the same as the protein concentration in the protein solution supplied to the first channel 10 .
- the virus infectivity titer (Log 10 TCID 50 (unit/mL)) of the mixture of protein solution and virus solution entering the virus removal filter 12 is, for example, 2 or more, 3 or more, or 4 or more.
- the infectious titer (Log 10 TCID 50 (unit/mL)) of the virus in the mixture is, for example, 10 or less, 9 or less, 8 or less, or 7 or less.
- a be the first constant velocity
- b be the second constant velocity
- x be the concentration of the virus in the mixture
- y be the concentration of the virus in the virus solution
- the ratio of the second constant velocity to the sum of the first constant velocity and the second constant velocity is, for example, 0.1% or more, 0.5% or more, 1.0% or more, 1.5% or more, 2.0% or more, or 3.0% or more. Also, the ratio of the second constant velocity to the sum of the first constant velocity and the second constant velocity is, for example, 20% or less, 15% or less, 10% or less, 9% or less, 8% or less, or 7% or less. .
- the mixture of the protein solution and the virus solution continuously flows to the virus removal filter 12 at the third constant velocity.
- the membrane area of the virus removal filter 12 is, for example, 0.0001 m 2 or more, 0.0002 m 2 or more, 0.0003 m 2 or more, 0.0006 m 2 or more, 0.0009 m 2 or more, or 0.0015 m 2 or more. Also, the membrane area of the virus removal filter 12 is, for example, 4 m 2 or less, 3 m 2 or less, 2 m 2 or less, or 1 m 2 or less.
- the shape of the virus removal filter 12 may be a hollow fiber shape or a flat membrane shape.
- hollow fiber virus removal filters examples include Planova 15N, 20N, 35N, and BioEX (Asahi Kasei Medical).
- flat membrane virus removal filters examples include Viresolve Pro (EMD Millipore Corporation), Ultipor VF Grade DV20, DV50, Pegasus (trademark) SV4, Gradech LV6 (Pall Corporation), Virosart CPV, HC, Sartorius B Site ), and NFP (Merck Millipore Corporation).
- the flux of the permeated liquid in the virus removal filter 12 is, for example, 0.1 LMH or more, 1.0 LMH or more, 2.0 LMH or more, 4.0 LMH or more, or 10.0 LMH or more.
- the flux of the permeated liquid in the virus removal filter 12 is, for example, 500 LMH or less, 400 LMH or less, 300 LMH or less, 200 LMH or less, or 100 LMH or less.
- the flux of the permeate in the virus removal filter 12 is adjusted by the first pump 13 and the second pump 21 .
- C (m 2 ) is the membrane area of the virus removal filter 12
- a is the first constant velocity
- b is the second constant velocity
- D min is the minimum value of b/(a+b)
- D is the maximum value of b/(a+b).
- max the minimum value of the permeate flux in the virus removal filter is F min (LMH)
- the maximum value of the permeate flux in the virus removal filter is F max (LMH)
- the minimum value of the first constant velocity a is a min ( mL/min) is given by the following formula (7), for example.
- a min (1 ⁇ D max )(1000/60) ⁇ F min ⁇ C (7)
- a max (1 ⁇ D min )(1000/60) ⁇ F max ⁇ C (8)
- bmin Dmin ( 1000/60 ) x Fmin x C (9)
- b max Dmax ( 1000/60) x Fmax x C (10)
- the protein solution supplied to the first channel 10 is continuously flowed through the first channel 10 provided with the protein purification section 11 and the virus removal filter 12 .
- the virus solution supplied to the second channel 20 is continuously flowed through the first channel 10 provided with the second channel 20 and the virus removal filter 12 .
- “flowing continuously” means that the solution is flowed without being pooled in the middle of the channel.
- the permeated liquid of the mixed liquid that has passed through the virus removal filter 12 is collected in the permeated liquid collection container 43, for example.
- methods for measuring the virus contained in the permeate of the mixed liquid that has passed through the virus removal filter 12 include, but are not limited to, an infectious titer measurement method and a quantitative PCR method.
- the infectious titer in the infectious titer measurement method is a unit representing the concentration of an infectious virus.
- Infectious titer methods include an endpoint method for determining the minimum infectious unit and a method for calculating local lesions formed by viruses.
- the virus is serially diluted, inoculated into a certain number or more of cultured cells, cultured for a certain period of time, and positive/negative of infection is determined to determine the dilution ratio at which 50% infection is positive.
- the 50 % infection endpoint (TCID50: Tissue culture infectious dose50) method is common.
- the plaque method is generally used, in which viruses are inoculated into cells cultured in sheets, the cells are covered with a medium containing agar, and the number of plaques formed by the number of inoculated viruses is measured.
- the unit of infectious titer is TCID 50 when using the TCID 50 method and pfu when using the plaque method.
- pfu is an abbreviation for plaque forming unit.
- the unit of TCID 50 /mL and pfu/mL represents the infectious titer per mL.
- the quantitative PCR method quantifies the nucleic acids contained in the virus. Since a virus usually encapsulates one molecule of nucleic acid per particle in its capsid, the number of nucleic acid molecules is equal to the number of virus particles.
- the virus clearance capacity of the virus removal filter 12 is adjusted based on the amount of virus contained in the mixture before passing through the virus removal filter 12 and the amount of virus contained in the mixture after passing through the virus removal filter 12. evaluate.
- the amount of virus may be represented by the infectious titer or the number of particles.
- the virus clearance ability of the virus removal filter 12 is evaluated, for example, by the logarithmic removal rate (LRV) given by the following formula (11).
- LRV Log10T1 - Log10T2 ( 11)
- T1 represents the amount of virus contained in the mixture before passing through the virus removal filter 12
- T2 represents the amount of virus contained in the mixture after passing through the virus removal filter 12 .
- the washing liquid may be supplied to the first channel 10 after stopping the supply of the protein solution to the first channel 10 .
- the cleaning liquid for example, flows from the cleaning liquid tank 44 to the first channel 10 .
- the washing solution is a protein- and virus-free solvent.
- the washing liquid may be passed through the protein purification section 11 and the virus removal filter 12, and the virus contained in the permeation liquid of the washing liquid that has passed through the virus removal filter 12 may be measured. If the amount of virus contained in the permeation liquid of the cleaning liquid is small, it can be evaluated that the virus removal filter 12 has a high virus retention capacity.
- the time until the washing liquid is supplied to the first flow path 10 is, for example, 0 minutes or more, 5 minutes or more, 10 minutes or more, or 30 minutes. minutes or more.
- the time (process pause) from when the supply of the protein solution to the first channel 10 is stopped until the cleaning solution is supplied to the first channel 10 is, for example, 24 hours or less, 20 hours or less, 10 hours or less, 5 hours or less, or 1 hour or less.
- the virus load condition on the virus removal filter 12 becomes constant, and the virus can be detected with high reproducibility. Clearance studies can be performed. If the virus solution is not supplied to the second channel 20 at a constant speed, the reproducibility of the virus clearance test may be lowered. In addition, if the virus solution is not supplied to the second channel 20 at a constant speed, the virus spike amount may fluctuate, making it impossible to calculate the logarithmic removal rate (LRV).
- LUV logarithmic removal rate
- Example 1 A system similar to the protein purification system shown in FIG. 1 was constructed.
- the protein purification section 11 a 0.5 mL column filled with a mixed-mode chromatography carrier (Cellufine MAX IB, JNC) was used.
- Cellufine MAX IB has a ligand obtained by partially modifying a polyamine with a butyl group.
- a 0.0003 m 2 Planova BioEX (Asahi Kasei Medical) was used as the virus removal filter 12 .
- a protein solution containing 5 mg/mL IgG was prepared using a pH 6.5 solvent containing 20 mmol/L Tris-acetate and 100 mmol/L NaCl. Also, MVM was added to the protein solution to prepare a virus solution containing 10% MVM.
- the first pump 13 and the second pump 21 were stopped and left to stand for 35 minutes. After that, a pH 6.5 solvent containing 20 mmol/L of tris-acetic acid and 100 mmol/L of NaCl was used as a cleaning liquid, and was flowed through the first channel 10 at a constant rate of 0.25 mL/min using the first pump 13. . A permeated liquid of the washing liquid that passed through the protein purification section 11 and the virus removal filter 12 was collected.
- the virus infectivity titer in the permeated liquid of the collected mixed liquid is measured, and the virus infectivity titer in the permeated liquid of the mixed liquid and the virus infectivity titer in the mixed liquid before passing through the virus removal filter 12 are calculated.
- the logarithmic removal rate (LRV) in the virus removal filter 12 was 5.56 or more.
- the infectivity titer of the virus in the permeated liquid of the collected washing liquid is measured, and the infectivity titer of the virus in the permeated liquid of the mixed liquid, the infective titer of the virus in the permeated liquid of the washing liquid, and the infective titer of the mixed liquid before passing through the virus removal filter 12
- the logarithmic removal rate (LRV) in the virus removal filter 12 calculated from the virus infection titer was 5.19 or higher. Purification conditions and purification results according to Example 1 are shown in FIGS.
- Example 2 A protein solution and a virus solution were subjected to a protein purification system in the same manner as in Example 1, except that a 0.5 mL column packed with a strong cation exchange chromatography carrier (Cellufine MAX GS, JNC) was used as the protein purification unit 11. flowed to In this case, the infectious titer (Log 10 TCID 50 (unit/mL)) of the virus in the mixture was 6.813.
- Virus removal filter 12 calculated from the virus infectivity in the mixed liquid permeated liquid, the virus infectivity in the washing liquid permeated liquid, and the virus infectivity in the mixed liquid before passing through the virus removal filter 12
- the purification conditions and purification results according to Example 2 are shown in FIGS.
- Example 3 A protein solution and a virus solution were subjected to protein purification in the same manner as in Example 1, except that a 0.5 mL column packed with a strong cation exchange chromatography carrier (Cellufine DexS-HbP, JNC) was used as the protein purification unit 11. sent to the system.
- the virus infectious titer Log 10 TCID 50 (unit/mL)
- the mixture was 6.875.
- the logarithmic removal rate (LRV) in the virus removal filter 12 which is calculated from the virus infectivity in the mixed liquid permeated and the virus infectivity in the mixed liquid before passing through the virus removal filter 12. 56 or more.
- Virus removal filter 12 calculated from the virus infectivity in the mixed liquid permeated liquid, the virus infectivity in the washing liquid permeated liquid, and the virus infectivity in the mixed liquid before passing through the virus removal filter 12
- the purification conditions and purification results according to Example 3 are shown in FIGS.
- Example 4 The protein and virus solutions were run through the protein purification system as in Example 1, except that the virus solution containing 10% x-MuLV was used. In this case, the infectious titer (Log 10 TCID 50 (unit/mL)) of the virus in the mixture was 5.075.
- the logarithmic removal rate (LRV) in the virus removal filter 12 which is calculated from the virus infectivity in the permeated liquid of the mixture and the virus infectivity in the mixture before passing through the virus removal filter 12; 75 or more.
- Virus removal filter 12 calculated from the virus infectivity in the mixed liquid permeated liquid, the virus infectivity in the washing liquid permeated liquid, and the virus infectivity in the mixed liquid before passing through the virus removal filter 12
- Purification conditions and purification results according to Example 4 are shown in FIGS.
- Example 5 The protein and virus solutions were run through the protein purification system as in Example 2, except that the virus solution containing 10% x-MuLV was used. In this case, the virus infectious titer (Log 10 TCID 50 (unit/mL)) in the mixture was 4.939.
- the logarithmic removal rate (LRV) in the virus removal filter 12 which is calculated from the virus infectivity in the permeated liquid of the mixture and the virus infectivity in the mixture before passing through the virus removal filter 12; 62 or more.
- Virus removal filter 12 calculated from the virus infectivity in the mixed liquid permeated liquid, the virus infectivity in the washing liquid permeated liquid, and the virus infectivity in the mixed liquid before passing through the virus removal filter 12
- the purification conditions and purification results according to Example 5 are shown in FIGS. 2 and 3.
- FIG. 1 The logarithmic rejection rate (LRV) at was greater than or equal to 3.26.
- Example 6 The protein and virus solutions were run through the protein purification system as in Example 3, except that the virus solution containing 10% x-MuLV was used. In this case, the infectious titer (Log 10 TCID 50 (unit/mL)) of the virus in the mixture was 4.809.
- the logarithmic removal rate (LRV) in the virus removal filter 12 which is calculated from the virus infectivity in the permeated liquid of the mixture and the virus infectivity in the mixture before passing through the virus removal filter 12; was 50 or more.
- Virus removal filter 12 calculated from the virus infectivity in the mixed liquid permeated liquid, the virus infectivity in the washing liquid permeated liquid, and the virus infectivity in the mixed liquid before passing through the virus removal filter 12
- the purification conditions and purification results according to Example 6 are shown in FIGS.
- Comparative example 1 A protein purification system according to Comparative Example 1 as shown in FIG. 4 was produced.
- the protein purification system according to Comparative Example 1 was provided with channel 110 , pump 113 provided in channel 110 , and virus removal filter 12 provided in channel 110 .
- a 0.0003 m 2 Planova BioEX (Asahi Kasei Medical) was used as the virus removal filter 12 .
- the protein purification system according to Comparative Example 1 did not include a protein purification section.
- the protein purification system according to Comparative Example 1 did not include the second channel and the second pump.
- a virus solution containing 1% MVM was prepared using the same material as in Example 1, and 30 mL of the virus solution was flowed through channel 110 at a constant rate of 0.025 mL/min using pump 113 .
- a virus solution with a virus infection titer (Log 10 TCID 50 (unit/mL)) of 6.13 flowed through the virus removal filter 12, and the flux of the permeated liquid was 5 LHM.
- the virus solution permeate was collected.
- Example 2 After 30 mL of the solution flowed through the virus removal filter 12, the pump 113 was stopped and left to stand for 35 minutes. After that, the same washing liquid as in Example 1 was flowed through the channel 110 at a constant speed of 0.25 mL/min using the pump 113 . A permeated liquid of the washing liquid that passed through the virus removal filter 12 was collected.
- the infectivity of the virus in the permeate of the collected virus solution is measured, and the infectivity of the virus in the permeate of the virus solution and the infectivity of the virus in the virus solution before passing through the virus removal filter 12 are calculated.
- the logarithmic removal rate (LRV) in the virus removal filter 12 was 5.27 or more.
- the infectivity titer of the virus in the permeate liquid of the collected washing liquid is measured, and the infectivity titer of the virus in the permeate liquid of the virus solution, the infectivity titer of the virus in the permeate liquid of the washing liquid, and the virus infectivity of the virus solution before passing through the virus removal filter 12
- the logarithmic removal rate (LRV) in the virus removal filter 12 calculated from the virus infection titer was 5.13 or more. Purification conditions and purification results according to Comparative Example 1 are shown in FIGS.
- the LRV obtained in Comparative Example 1 approximates the LRV obtained in Examples 1 to 3. From this, it was shown that in Examples 1 to 3, even if the protein purification unit 11 was located upstream of the virus removal filter 12, the virus removal ability of only the virus removal filter 12 could be tested.
- Comparative example 2 The virus solution was passed through the protein purification system according to Comparative Example 1 in the same manner as in Comparative Example 1, except that the virus solution was passed through the channel 110 at a constant velocity of 0.05 mL/min.
- the virus infectious titer (Log 10 TCID 50 (unit/mL)) in the virus solution was 6.25, and the flux of the permeate was 10 LHM.
- the infectivity of the virus in the permeate of the collected virus solution is measured, and the infectivity of the virus in the permeate of the virus solution and the infectivity of the virus in the virus solution before passing through the virus removal filter 12 are calculated.
- the logarithmic removal rate (LRV) in the virus removal filter 12 was 5.40 or more.
- the infectivity titer of the virus in the permeate liquid of the collected washing liquid is measured, and the infectivity titer of the virus in the permeate liquid of the virus solution, the infectivity titer of the virus in the permeate liquid of the washing liquid, and the virus infectivity of the virus solution before passing through the virus removal filter 12
- the logarithmic removal rate (LRV) of the virus removal filter 12 calculated from the virus infection titer was 5.24 or more. Purification conditions and purification results according to Comparative Example 2 are shown in FIGS.
- Comparative Example 3 The virus solution was passed through the protein purification system according to Comparative Example 1 in the same manner as in Comparative Example 1, except that the virus solution was passed through the channel 110 at a constant velocity of 0.1 mL/min.
- the virus infectious titer (Log 10 TCID 50 (unit/mL)) in the virus solution was 6.44, and the flux of the permeate was 20 LHM.
- the infectivity of the virus in the permeate of the collected virus solution is measured, and the infectivity of the virus in the permeate of the virus solution and the infectivity of the virus in the virus solution before passing through the virus removal filter 12 are calculated.
- the logarithmic removal rate (LRV) in the virus removal filter 12 was 5.59 or more.
- the infectivity titer of the virus in the permeate liquid of the collected washing liquid is measured, and the infectivity titer of the virus in the permeate liquid of the virus solution, the infectivity titer of the virus in the permeate liquid of the washing liquid, and the virus infectivity of the virus solution before passing through the virus removal filter 12
- the logarithmic removal rate (LRV) of the virus removal filter 12 calculated from the virus infection titer was 5.43 or higher. Purification conditions and purification results according to Comparative Example 3 are shown in FIGS.
- Comparative Example 4 A protein purification system according to Comparative Example 4 as shown in FIG. 7 was produced.
- the protein purification system according to Comparative Example 4 had a channel 210 , a pump 213 provided in the channel 210 , and a protein purification section 11 provided in the channel 210 .
- the protein purification system according to Comparative Example 4 did not have a virus removal filter. Also, the protein purification system according to Comparative Example 4 did not include the second channel and the second pump.
- a virus solution containing 5% MVM was prepared using the same materials as in Example 1, and 30 mL of the virus solution was flowed through channel 110 at a constant rate of 0.25 mL/min using pump 213 .
- a virus solution with a virus infection titer (Log 10 TCID 50 (unit/mL)) of 7.741 flowed through the protein purification section 11 .
- the virus solution permeate was collected.
- Example 1 After 30 mL of the solution flowed through the protein purification section 11, the pump 213 was stopped and left to stand for 0.05 minutes. After that, the same washing liquid as in Example 1 was flowed through the channel 210 at a constant speed of 0.25 mL/min using the pump 213 . A permeated liquid of the washing liquid that has passed through the protein purification section 11 was collected.
- the infectivity of the virus in the permeate of the collected virus solution is measured, and the infectivity of the virus in the permeate of the virus solution and the infectivity of the virus in the virus solution before passing through the protein purification section 11 are calculated.
- the logarithmic removal rate (LRV) in the protein purification section 11 was 3.94.
- the infectivity titer of the virus in the permeate liquid of the collected washing liquid is measured, and the infectivity titer of the virus in the permeate liquid of the virus solution, the infectivity titer of the virus in the permeate liquid of the washing liquid, and the virus infectivity of the virus solution before permeating the protein purification unit 11
- the logarithmic removal rate (LRV) in the protein purification section 11 calculated from the infectious titer of the virus was 1.96. Purification conditions and purification results according to Comparative Example 4 are shown in FIGS.
- Comparative Example 5 The virus solution was passed through the protein purification system in the same manner as in Comparative Example 4, except that a 0.5 mL column packed with a strong cation exchange chromatography carrier (Cellufine MAX GS, JNC) was used as the protein purification unit 11. .
- a virus solution with a virus infection titer (Log 10 TCID 50 (unit/mL)) of 7.741 flowed through the protein purification section 11 .
- the infectivity of the virus in the permeate of the collected virus solution is measured, and the infectivity of the virus in the permeate of the virus solution and the infectivity of the virus in the virus solution before passing through the protein purification section 11 are calculated.
- the logarithmic removal rate (LRV) in the protein purification section 11 was 0.25.
- the infectivity titer of the virus in the permeate liquid of the collected washing liquid is measured, and the infectivity titer of the virus in the permeate liquid of the virus solution, the infectivity titer of the virus in the permeate liquid of the washing liquid, and the virus infectivity of the virus solution before permeating the protein purification unit 11
- the logarithmic removal rate (LRV) in the protein purification section 11 calculated from the virus infectivity titer was 0.21.
- Purification conditions and purification results according to Comparative Example 5 are shown in FIGS. 8 and 9.
- Comparative Example 6 The virus solution was passed through the protein purification system in the same manner as in Comparative Example 4, except that a 0.5 mL column packed with a strong cation exchange chromatography carrier (Cellufine DexS-HbP, JNC) was used as the protein purification unit 11. did. As a result, a virus solution with a virus infection titer (Log 10 TCID 50 (unit/mL)) of 7.738 flowed through the protein purification section 11 .
- a virus infection titer Log 10 TCID 50 (unit/mL)
- the infectivity of the virus in the permeate of the collected virus solution is measured, and the infectivity of the virus in the permeate of the virus solution and the infectivity of the virus in the virus solution before passing through the protein purification section 11 are calculated.
- the logarithmic removal rate (LRV) in protein purification section 11 was ⁇ 0.39.
- the infectivity titer of the virus in the permeate liquid of the collected washing liquid is measured, and the infectivity titer of the virus in the permeate liquid of the virus solution, the infectivity titer of the virus in the permeate liquid of the washing liquid, and the virus infectivity of the virus solution before permeating the protein purification unit 11
- the logarithmic removal rate (LRV) in the protein purification section 11 calculated from the virus infectivity titer was 0.38.
- Purification conditions and purification results according to Comparative Example 6 are shown in FIGS. 8 and 9.
- FIG. 8 and 9 Purification conditions and purification results according to Comparative Example 6 are shown in FIGS. 8 and 9.
- Comparative Example 7 The virus solution was run through the protein purification system according to Comparative Example 4 in the same manner as in Comparative Example 4, except that the virus solution containing 10% x-MuLV was used. In this case, the virus infectious titer (Log 10 TCID 50 (unit/mL)) in the virus solution was 6.614.
- the infectivity of the virus in the permeate of the collected virus solution is measured, and the infectivity of the virus in the permeate of the virus solution and the infectivity of the virus in the virus solution before passing through the protein purification section 11 are calculated.
- the logarithmic removal rate (LRV) in the protein purification section 11 was 2.25.
- the infectivity titer of the virus in the permeate liquid of the collected washing liquid is measured, and the infectivity titer of the virus in the permeate liquid of the virus solution, the infectivity titer of the virus in the permeate liquid of the washing liquid, and the virus infectivity of the virus solution before permeating the protein purification unit 11
- the logarithmic removal rate (LRV) in the protein purification section 11 calculated from the infectious titer of the virus was 1.96. Purification conditions and purification results according to Comparative Example 7 are shown in FIGS. 8 and 9.
- FIG. 8 and 9 Purification conditions and purification results according to Comparative Example 7 are shown in FIGS. 8 and 9.
- Comparative Example 8 The virus solution was run through the protein purification system according to Comparative Example 4 in the same manner as in Comparative Example 5, except that the virus solution containing 10% x-MuLV was used. In this case, the virus infectious titer (Log 10 TCID 50 (unit/mL)) in the virus solution was 6.239.
- the infectivity of the virus in the permeate of the collected virus solution is measured, and the infectivity of the virus in the permeate of the virus solution and the infectivity of the virus in the virus solution before passing through the protein purification section 11 are calculated.
- the logarithmic removal rate (LRV) in the protein purification section 11 was 0.13.
- the infectivity titer of the virus in the permeate liquid of the collected washing liquid is measured, and the infectivity titer of the virus in the permeate liquid of the virus solution, the infectivity titer of the virus in the permeate liquid of the washing liquid, and the virus infectivity of the virus solution before passing through the protein purification unit 11
- the logarithmic removal rate (LRV) in the protein purification section 11 calculated from the virus infectivity titer was 0.21.
- Purification conditions and purification results according to Comparative Example 8 are shown in FIGS. 8 and 9.
- Comparative Example 9 The virus solution was run through the protein purification system according to Comparative Example 4 in the same manner as in Comparative Example 6, except that the virus solution containing 10% x-MuLV was used. In this case, the virus infectious titer (Log 10 TCID 50 (unit/mL)) in the virus solution was 6.368.
- the infectivity of the virus in the permeate of the collected virus solution is measured, and the infectivity of the virus in the permeate of the virus solution and the infectivity of the virus in the virus solution before passing through the protein purification section 11 are calculated. , the logarithmic removal rate (LRV) in the protein purification section 11 was 0.44.
- the infectivity titer of the virus in the permeate liquid of the collected washing liquid is measured, and the infectivity titer of the virus in the permeate liquid of the virus solution, the infectivity titer of the virus in the permeate liquid of the washing liquid, and the virus infectivity of the virus solution before permeating the protein purification unit 11
- the logarithmic removal rate (LRV) in the protein purification section 11 calculated from the virus infectivity titer was 0.38.
- Purification conditions and purification results according to Comparative Example 9 are shown in FIGS. 8 and 9.
- FIG. 8 and 9 Purification conditions and purification results according to Comparative Example 9 are shown in FIGS. 8 and 9.
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Abstract
Description
x/y=b/(a+b) (1)
第1等速aの最小値amin(mL/分)が下記式(2)で与えられ、
amin=(1-Dmax)(1000/60)×Fmin×C (2)
第1等速aの最大値amax(mL/分)が下記式(3)で与えられ、
amax=(1-Dmin)(1000/60)×Fmax×C (3)
第2等速bの最小値bmin(mL/分)が下記式(4)で与えられ、
bmin=Dmin(1000/60)×Fmin×C (4)
第2等速bの最大値bmax(mL/分)が下記式(5)で与えられる、
bmax=Dmax(1000/60)×Fmax×C (5)
[7]に記載の方法。
x/y=b/(a+b) (6)
amin=(1-Dmax)(1000/60)×Fmin×C (7)
amax=(1-Dmin)(1000/60)×Fmax×C (8)
bmin=Dmin(1000/60)×Fmin×C (9)
bmax=Dmax(1000/60)×Fmax×C (10)
LRV=Log10T1-Log10T2 (11)
ここで、T1はウイルス除去フィルター12を透過する前の混合液に含まれるウイルスの量を表し、T2はウイルス除去フィルター12を透過した後の混合液に含まれるウイルスの量を表す。
図1に示すようなタンパク質精製システムと同様のシステムを作製した。タンパク質精製部11としては、ミックスモード用クロマトグラフィー担体(セルファインMAX IB、JNC)を充填した0.5mLのカラムを用いた。セルファインMAX IBは、ポリアミンの一部をブチル基で修飾したリガンドを有する。ウイルス除去フィルター12としては、0.0003m2のPlanova BioEX(旭化成メディカル)を用いた。
タンパク質精製部11として、強カチオン交換クロマトグラフィー担体(セルファインMAX GS、JNC)を充填した0.5mLのカラムを用いた以外は、実施例1と同様に、タンパク質溶液とウイルス溶液をタンパク質精製システムに流した。この場合、混合液におけるウイルスの感染価(Log10 TCID50(unit/mL))は6.813であった。
タンパク質精製部11として、強カチオン交換クロマトグラフィー担体(セルファインDexS-HbP、JNC)を充填した0.5mLのカラムを用いた以外は、実施例1と同様に、タンパク質溶液とウイルス溶液をタンパク質精製システムに流した。この場合、混合液におけるウイルスの感染価(Log10 TCID50(unit/mL))は6.875であった。
10%のx-MuLVを含むウイルス溶液を用いた以外は、実施例1と同様に、タンパク質溶液とウイルス溶液をタンパク質精製システムに流した。この場合、混合液におけるウイルスの感染価(Log10 TCID50(unit/mL))は5.075であった。
10%のx-MuLVを含むウイルス溶液を用いた以外は、実施例2と同様に、タンパク質溶液とウイルス溶液をタンパク質精製システムに流した。この場合、混合液におけるウイルスの感染価(Log10 TCID50(unit/mL))は4.939であった。
10%のx-MuLVを含むウイルス溶液を用いた以外は、実施例3と同様に、タンパク質溶液とウイルス溶液をタンパク質精製システムに流した。この場合、混合液におけるウイルスの感染価(Log10 TCID50(unit/mL))は4.809であった。
図4に示すような比較例1に係るタンパク質精製システムを作製した。比較例1に係るタンパク質精製システムは、流路110と、流路110に設けられたポンプ113と、流路110に設けられたウイルス除去フィルター12と、を備えていた。ウイルス除去フィルター12としては、0.0003m2のPlanova BioEX(旭化成メディカル)を用いた。比較例1に係るタンパク質精製システムは、タンパク質精製部を備えなかった。また、比較例1に係るタンパク質精製システムは、第2流路及び第2ポンプを備えなかった。
ウイルス溶液を0.05mL/分の等速で流路110に流した以外は、比較例1と同様に、ウイルス溶液を比較例1に係るタンパク質精製システムに流した。この場合、ウイルス溶液におけるウイルスの感染価(Log10 TCID50(unit/mL))は6.25であり、透過液のフラックスは、10LHMであった。
ウイルス溶液を0.1mL/分の等速で流路110に流した以外は、比較例1と同様に、ウイルス溶液を比較例1に係るタンパク質精製システムに流した。この場合、ウイルス溶液におけるウイルスの感染価(Log10 TCID50(unit/mL))は6.44であり、透過液のフラックスは、20LHMであった。
図7に示すような比較例4に係るタンパク質精製システムを作製した。比較例4に係るタンパク質精製システムは、流路210と、流路210に設けられたポンプ213と、流路210に設けられたタンパク質精製部11と、を備えていた。タンパク質精製部11としては、ミックスモード用クロマトグラフィー担体(セルファインMAX IB、JNC)を充填した0.5mLのカラムを用いた。比較例4に係るタンパク質精製システムは、ウイルス除去フィルターを備えなかった。また、比較例4に係るタンパク質精製システムは、第2流路及び第2ポンプを備えなかった。
タンパク質精製部11として、強カチオン交換クロマトグラフィー担体(セルファインMAX GS、JNC)を充填した0.5mLのカラムを用いた以外は、比較例4と同様に、ウイルス溶液をタンパク質精製システムに流した。これにより、ウイルスの感染価(Log10 TCID50(unit/mL))が7.741のウイルス溶液が、タンパク質精製部11を流れた。
タンパク質精製部11として、強カチオン交換クロマトグラフィー担体(セルファインDexS-HbP、JNC)を充填した0.5mLのカラムを用いた以外は、比較例4と同様に、ウイルス溶液をタンパク質精製システムに流した。これにより、ウイルスの感染価(Log10 TCID50(unit/mL))が7.738のウイルス溶液が、タンパク質精製部11を流れた。
10%のx-MuLVを含むウイルス溶液を用いた以外は、比較例4と同様に、ウイルス溶液を比較例4に係るタンパク質精製システムに流した。この場合、ウイルス溶液におけるウイルスの感染価(Log10 TCID50(unit/mL))は6.614であった。
10%のx-MuLVを含むウイルス溶液を用いた以外は、比較例5と同様に、ウイルス溶液を比較例4に係るタンパク質精製システムに流した。この場合、ウイルス溶液におけるウイルスの感染価(Log10 TCID50(unit/mL))は6.239であった。
10%のx-MuLVを含むウイルス溶液を用いた以外は、比較例6と同様に、ウイルス溶液を比較例4に係るタンパク質精製システムに流した。この場合、ウイルス溶液におけるウイルスの感染価(Log10 TCID50(unit/mL))は6.368であった。
Claims (20)
- 上流にタンパク質精製部が設けられ、下流にウイルス除去フィルターが設けられた第1流路に、タンパク質溶液を供給し、第1等速で前記タンパク質溶液を、前記タンパク質精製部に流すことと、
前記第1流路の前記タンパク質精製部と前記ウイルス除去フィルターの間に接続された第2流路に、第2等速でウイルス溶液を供給し、精製された前記タンパク質溶液に、前記ウイルス溶液を、前記第1流路において、混合することと、
第3等速で、前記タンパク質溶液と前記ウイルス溶液の混合液を、前記ウイルス除去フィルターに流すことと、
前記ウイルス除去フィルターを透過した前記混合液の透過液に含まれるウイルスを測定することと、
を含む、ウイルスクリアランス試験の方法。 - 前記第1流路に、前記第1等速で前記タンパク質溶液を前記タンパク質精製部に流すための第1ポンプが設けられている、請求項1に記載の方法。
- 前記第2流路に、前記第2等速で前記ウイルス溶液を流すための第2ポンプが設けられている、請求項1又は2に記載の方法。
- 前記タンパク質溶液を、連続的に、前記タンパク質精製部に流す、請求項1から3のいずれか1項に記載の方法。
- 前記ウイルス溶液を、連続的に、前記第2流路に流す、請求項1から4のいずれか1項に記載の方法。
- 前記混合液を、連続的に、前記ウイルス除去フィルターに流す、請求項1から5のいずれか1項に記載の方法。
- 前記第1等速をa、前記第2等速をb、前記混合液におけるウイルス濃度をx、前記ウイルス溶液におけるウイルス濃度をyとして、a,b,x,yが下記式(1)を満たす、請求項1から6のいずれか1項に記載の方法。
x/y=b/(a+b) (1) - 前記第1等速と前記第2等速の和に対する前記第2等速の比が0.1%以上20%以下である、請求項1から7のいずれか1項に記載の方法。
- 前記混合液におけるウイルスの感染価(Log10 TCID50(unit/mL))が、2以上10以下である、請求項1から8のいずれか1項に記載の方法。
- 前記ウイルス除去フィルターの膜面積が、0.0001m2以上4m2以下である、請求項1から9のいずれか1項に記載の方法。
- 前記ウイルス除去フィルターにおける前記透過液のフラックスが、0.1LMH以上500LMH以下である、請求項1から10のいずれか1項に記載の方法。
- 前記ウイルス除去フィルターの膜面積をC(m2)、b/(a+b)の最小値をDmin、b/(a+b)の最大値をDmax、前記ウイルス除去フィルターにおける前記透過液のフラックスの最小値をFmin(LMH)、前記ウイルス除去フィルターにおける前記透過液のフラックスの最大値をFmax(LMH)として、
前記第1等速aの最小値amin(mL/分)が下記式(2)で与えられ、
amin=(1-Dmax)(1000/60)×Fmin×C (2)
前記第1等速aの最大値amax(mL/分)が下記式(3)で与えられ、
amax=(1-Dmin)(1000/60)×Fmax×C (3)
前記第2等速bの最小値bmin(mL/分)が下記式(4)で与えられ、
bmin=Dmin(1000/60)×Fmin×C (4)
前記第2等速bの最大値bmax(mL/分)が下記式(5)で与えられる、
bmax=Dmax(1000/60)×Fmax×C (5)
請求項7に記載の方法。 - 前記第1流路に、前記タンパク質溶液を供給することを停止した後、前記第1流路に、洗浄液を供給し、前記洗浄液を、前記タンパク質精製部及び前記ウイルス除去フィルターに流すことと、
前記ウイルス除去フィルターを透過した前記洗浄液の透過液に含まれるウイルスを測定することと、
をさらに含む、請求項1から12のいずれか1項に記載の方法。 - 前記第1流路に、前記タンパク質溶液を供給することを停止した後、前記第1流路に、前記洗浄液を供給するまでの時間が、0分以上24時間以下である、請求項13に記載の方法。
- 前記ウイルス溶液が、タンパク質を含む、請求項1から14のいずれか1項に記載の方法。
- 前記ウイルス溶液が、前記タンパク質溶液が含むタンパク質と同じタンパク質を含む、請求項1から15のいずれか1項に記載の方法。
- 前記ウイルス溶液における前記タンパク質の濃度が、前記タンパク質溶液における前記タンパク質の濃度と同じである、請求項15又は16に記載の方法。
- 前記ウイルス除去フィルターを透過する前の前記混合液に含まれる前記ウイルスの量と、前記ウイルス除去フィルターを透過した前記混合液の透過液に含まれるウイルスの量と、を比較することを更に含む、請求項1から17のいずれか1項に記載の方法。
- 前記タンパク質精製部が、ウイルスの除去能を有する、請求項1から18のいずれか1項に記載の方法。
- 前記タンパク質精製部11における対数除去率(LRV)が、0以上7以下である、請求項19に記載の方法。
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