WO2018043584A1 - 異なる方式で抗原を固定化した抗原担持不溶性担体粒子を用いる抗体測定法、抗体測定用試薬 - Google Patents
異なる方式で抗原を固定化した抗原担持不溶性担体粒子を用いる抗体測定法、抗体測定用試薬 Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
- G01N33/543—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals
- G01N33/54353—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals with ligand attached to the carrier via a chemical coupling agent
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
- G01N33/543—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
- G01N33/543—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals
- G01N33/544—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals the carrier being organic
- G01N33/545—Synthetic resin
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
- G01N33/569—Immunoassay; Biospecific binding assay; Materials therefor for microorganisms, e.g. protozoa, bacteria, viruses
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
- G01N33/569—Immunoassay; Biospecific binding assay; Materials therefor for microorganisms, e.g. protozoa, bacteria, viruses
- G01N33/56911—Bacteria
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2469/00—Immunoassays for the detection of microorganisms
- G01N2469/20—Detection of antibodies in sample from host which are directed against antigens from microorganisms
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/30—Against vector-borne diseases, e.g. mosquito-borne, fly-borne, tick-borne or waterborne diseases whose impact is exacerbated by climate change
Definitions
- the present invention relates to a method for measuring a biological substance, more specifically, an antigen-measuring insoluble carrier particle in which an antigen is immobilized by a different method, for example, an antigen-bearing latex particle, an antibody measuring means using a mixture of each other It is invention regarding.
- a reagent using a latex agglutination method is widely used as one of immunological measurement methods.
- a latex on which an antigen or antibody is supported (coated or coupled) in a liquid phase is used to form a measurement system for detecting the antibody or antigen. Based on the property that latex particles aggregate due to the formation of immune complexes, the degree of aggregation can be confirmed visually, or an increase in turbidity can be measured optically as a change in absorbance or scattered light intensity (hereinafter, Also called latex method: Patent Document 1).
- the sandwich immunoassay method such as ELISA is accurate and can be used as a reference method.
- components other than the substance to be measured and components in the measurement reagent are removed.
- the measurement process takes a long time and the measurement operation is complicated. Therefore, it is not suitable for measuring a large number of measurement samples in a short time.
- the latex method is simple to operate and can be easily applied to general-purpose biochemical automatic analyzers widely used in clinical examinations, enabling measurement in a short time and measurement of a large number of test samples. It is.
- the latex method is used in many clinical examination items.
- An object of the present invention is to expand the measurement range and improve sensitivity and specificity in antibody measurement using insoluble carrier particles such as latex carrying an antigen.
- the present invention provides a means for obtaining good measurement results even when a mixture of a plurality of substances such as a lysate derived from a microorganism is supported.
- a physical adsorption method that is, when an insoluble carrier particle is loaded with protein or the like by direct contact using an electrostatic interaction (hydrophobic interaction) between the insoluble carrier particle and the loaded protein.
- electrostatic interaction hydrophobic interaction
- loading of a low molecular weight substance or hapten has a drawback that it can be buried on the surface of an insoluble carrier or buried with a blocking agent used to suppress non-specific aggregation.
- the physical adsorption method also has difficulties in supporting proteins with very few hydrophobic amino acid residues.
- a chemical bonding method that is, a method in which a carboxyl group and an amino group on the surface of an insoluble carrier particle or protein are covalently bonded with a coupling reagent such as carbodiimide, an aldehyde group or a tosyl group on the surface of the insoluble carrier particle and an amino group of the protein
- a coupling reagent such as carbodiimide, an aldehyde group or a tosyl group on the surface of the insoluble carrier particle and an amino group of the protein
- the supporting method when supporting a “mixture of a plurality of substances” such as a lysate derived from microorganisms, if the supporting method is only one of the physical adsorption method and the chemical bonding method, the size and protein of each substance Since the content of hydrophilic amino acid residue and hydrophobic amino acid residue is different, the supported substance is biased, and as a result, the obtained antigen-carrying insoluble carrier particles can obtain a good measurement result.
- Data on the microorganisms that cause the disease, etc. from which the target antibody is derived because the type of target antibody to be captured is limited to those that bind to a limited substance. There is a problem that acquisition may not be performed sufficiently.
- antibodies against microorganisms in a living body exist as a plurality of antibodies against a plurality of antigens instead of an antibody against a single antigen, more reliable data acquisition is possible if these plurality of antibodies can be captured at once.
- insoluble carrier particles carrying a mixture of an unspecified number of substances such as antigenic substances derived from living organisms as antigens as far as the present inventors know, at the time of filing of the present application.
- the inventors of the present invention have studied the above-mentioned problem, and insoluble carrier particles loaded with an antigenic substance by a physical adsorption method and insoluble carrier particles loaded with the antigenic substance by a chemical bonding method. Realizing high sensitivity and specificity with a wide measurement range by using a solution containing insoluble carrier particles containing both in antibody measurement, especially a mixture of multiple substances such as antigenic substances derived from organisms The present invention has been completed by finding that it can be realized even in such a case.
- the present invention relates to insoluble carrier particles (hereinafter also referred to as physical adsorption particles) in which a predetermined antigen is supported by physical adsorption and insoluble carrier particles (hereinafter also referred to as chemical binding particles) in which the antigen is supported by chemical bonding. ),
- a liquid containing insoluble carrier particles containing both of the above (hereinafter, also referred to as a liquid containing the present invention) is brought into contact with a sample separated from a living body that can contain the target antibody, and is supported on the carrier particles.
- an antibody measurement method (hereinafter also referred to as a measurement method of the present invention), characterized by detecting an agglutination reaction of the carrier particles due to an antigen-antibody reaction between an antigen and a target antibody in the sample.
- a diluent is preferably used in addition to the containing solution of the present invention.
- the present invention also relates to a reagent for measuring an antibody (hereinafter referred to as the present invention), which is a liquid containing insoluble carrier particles containing both physically adsorbed particles and chemically bonded particles (the liquid containing the present invention). Also referred to as a measuring reagent of the invention). Furthermore, the present invention provides a measurement kit (hereinafter also referred to as a kit of the present invention), which comprises the measurement reagent of the present invention (containing liquid of the present invention) and a diluent.
- a measurement kit hereinafter also referred to as a kit of the present invention
- Both the physically adsorbed particles and the chemically bonded particles are preferably provided as latex.
- insoluble carrier particles such as silica colloid, magnetic particles, and metal colloid can be used.
- the containing state is not particularly limited as long as it contains insoluble carrier particles. That is, the contained liquid includes a dispersion liquid, an emulsion liquid, a suspension liquid, a precipitation liquid, a multilayer separation liquid, and the like.
- the insoluble carrier particles in the contained liquid may be subjected to a surface treatment as necessary.
- the physical adsorption particles are insoluble carrier particles on which a predetermined antigen is supported by the physical adsorption method as defined above.
- the average particle diameter of the physical adsorption particles can be used in the range of 0.01 ⁇ m-1.0 ⁇ m, preferably 0.05 ⁇ m-0.35 ⁇ m, more preferably 0.10 ⁇ m-0.35 ⁇ m, most preferably The thickness is preferably 0.20 ⁇ m-0.35 ⁇ m.
- Physically adsorbed particles can be produced by bringing an antigen to be adsorbed into contact with a liquid containing insoluble carrier particles to be subjected to physical adsorption.
- the chemically bonded particles are insoluble carrier particles on which a predetermined antigen is supported by the chemical bonding method as defined above.
- the average particle size of the chemically bonded particles can be used in the range of 0.01 ⁇ m-1.0 ⁇ m, preferably 0.05 ⁇ m-0.35 ⁇ m, more preferably 0.10 ⁇ m-0.35 ⁇ m, most preferably The thickness is preferably 0.20 ⁇ m-0.35 ⁇ m.
- the chemically bound particles can be produced by performing an operation of covalently binding the antigen to be bound to the liquid containing insoluble carrier particles to be subjected to the chemical binding method.
- the containing liquid of the present invention can be preferably prepared by mixing the above-mentioned “physically adsorbed particle containing liquid” and “chemically bonded particle containing liquid”.
- the mixing ratio (mass ratio) of physically adsorbed particles and chemically bonded particles is preferably 10: 1-1: 10 (physically adsorbed particles: chemically bonded particles), more preferably 5: 1-1: 5 (physical adsorption).
- the content of the physically adsorbed particles in the measurement reagent when measuring the target antibody in the sample or in the case of using a diluent is 0.045% by mass or more in the mixture of the reagent for measurement and the diluent. When it exists, there exists a tendency for the improvement of the effect corresponding to the increase in the content of the said particle
- Predetermined in “predetermined antigen” can be rephrased, for example, as “selected”. It means “determined” or “selected” as an antigen that binds to the antibody selected for measurement, and once defined or selected, the antigen is uniquely Determine.
- the antigen that can be a “predetermined antigen” is not particularly limited, and can be widely selected as long as it is a substance that binds to the antibody to be measured, but is preferably an antigen that binds to an antibody in a sample separated from a living body. That is, it is preferable to use an antibody against a substance present in the living body with a specific disease or constitution as a target antibody and an antigen that binds to this as a “predetermined antigen”.
- a substance that can be a “predetermined antigen” is typically a protein, but includes other substances such as sugar chains and lipids.
- living body widely refers to the body of living organisms in general, but is usually a human body.
- the antigen as a “mixture of a plurality of substances”, the effects of the present invention are preferably exhibited.
- the mixture include antigenic substances derived from living organisms, and preferably lysates derived from microorganisms such as bacteria and viruses.
- the antigen contains at least one substance having a molecular weight of 5000 or more, particularly preferably 10,000 or more
- the effect of the present invention is suitably exhibited.
- the upper limit of the molecular weight is not particularly limited as long as it can be supported on insoluble carrier particles, but is preferably about 2,000,000 or less.
- the above-mentioned “mixture of a plurality of substances” may apply to this specific molecular weight condition.
- the above-mentioned liquid containing the present invention is brought into contact with a sample separated from a living body that can contain a target antibody, and the antigen antibody carried on the insoluble carrier particles of the liquid containing the target antibody and the target antibody in the sample The degree of aggregation reaction of the carrier particles due to the reaction can be detected.
- sample separated from the living body that can contain the target antibody is not particularly limited as long as it may contain the antibody to be measured.
- blood, serum, plasma, urine, lymph, acupuncture fluid examples include cerebrospinal fluid, sweat, saliva, gastric fluid, lung lavage fluid, and feces. Of these, blood, serum and plasma are preferred.
- the main “reaction of insoluble carrier particles carrying a predetermined antigen by an antigen-antibody reaction” is an agglutination reaction, which is insoluble using a slide agglutination method, optical measurement method, microtiter method, filter separation method, etc.
- the desired antibody can be measured by detecting the aggregation of the carrier particles.
- the measurement method of the present invention is preferably performed using a biochemical automatic analyzer.
- the biochemical automatic analyzer is based on an optical measurement method. Usually, after use, a sample such as serum is diluted with a diluent and heated before use, and then a reagent (in the case of the present invention) is used. The content liquid of the present invention is added to perform the measurement.
- biochemical automatic analyzers currently available include Hitachi 7180, LABOPECT 008, LABOPECT 006 (manufactured by Hitachi High-Technologies Corporation); JCA-BM6010, JCA-BM6050, JCA-BM9130, etc. (JEOL) TBA-c16000, TBA-2000FR, TBA-120FR, etc. (manufactured by Toshiba Medical Systems Co., Ltd.); AU680, AU5800, etc. (manufactured by Beckman Coulter, Inc.), and the like. It is not a thing.
- the present invention provides a means for measuring antibodies with high sensitivity and specificity along with a wide measurement range.
- the containing liquid of the present invention is a containing liquid containing both physically adsorbed particles and chemically bonded particles.
- Latex is an emulsion in which fine particles of polymer (latex particles) are stably dispersed in an aqueous solvent.
- the latex can be produced by a conventional method such as an emulsion polymerization method, a soap-free emulsion polymerization method, a seed polymerization method, a stage feed emulsion polymerization method, a power feed polymerization method, or a suspension polymerization method.
- the particle size can also be adjusted using a conventional method in each of these latex preparation methods.
- the particle size of the latex can be adjusted by adjusting the types and amounts of monomers, emulsifiers and initiators, the polymerization temperature, and the like.
- the type of latex is not particularly limited as long as the physical adsorption method used for producing the physical adsorption particles or the chemical bonding method used for producing the chemical bonding particles can be applied. It is preferred to select the appropriate type for each of the methods.
- latex suitable for the physical adsorption method examples include polystyrene latex, extremely low carboxylic acid latex, and hydrophilic group localized latex.
- latex suitable for the chemical bonding method examples include latex containing latex particles having a carboxyl group, a hydroxyl group, an amino group, an aldehyde group, a tosyl group or the like on the surface.
- the particle size of latex particles for physical adsorption and latex particles for chemical bonding is not particularly limited, and can be used in the range of 0.01 ⁇ m to 1.0 ⁇ m, preferably 0.05 ⁇ m. It is ⁇ 0.35 ⁇ m, more preferably 0.10 ⁇ m-0.35 ⁇ m, and most preferably 0.20 ⁇ m-0.35 ⁇ m.
- the particle size of the latex particles used in the measurement can be determined in order to obtain appropriate sensitivity, specificity and measurement range according to the properties of the supported antigen and the measurement antibody. . Specifically, when it is desired to increase the cohesiveness of latex due to immune reaction, it is preferable to select a medium to large particle size (0.20-0.35 ⁇ m). When the concentration is very high, it may be preferable to select a small particle size (0.10 ⁇ m or less).
- examples of insoluble carrier particles other than latex particles include silica colloid particles, magnetic particles, and metal colloid particles. These insoluble carrier particles can be made into insoluble carrier particles that can be used in the present invention by modifying the particle surface to which a functional group suitable for physical adsorption or chemical bonding is added.
- the antigen to be supported on the insoluble carrier particles is not limited at all as long as it can be bound to the antibody to be measured.
- the effects of the present invention are suitably exhibited by using a “mixture of substances” or “a substance containing a substance having a large molecular weight”. Examples of the mixture include antigenic substances derived from living organisms, and preferably lysates derived from microorganisms such as bacteria and viruses.
- the lysates of Helicobacter pylori used in the examples described later include urease B (Urease B), urease A (Urease A), Cag A (Cag A), flagellin, heat shock protein (Heat Shock Protein), Contains other substances.
- the molecular weight of substances contained in these Helicobacter pylori lysates is approximately 10,000-200000.
- a substance specific to the infecting microorganism can be used as a carrier antigen.
- microorganisms include Helicobacter pylori, bacteria such as group A lytic streptococci, group B lytic streptococci, pneumococcal U antigen, Escherichia coli O157, Clostridium difficile, Legionella, cholera, and meningitis-causing bacteria.
- Influenza virus parainfluenza virus, rotavirus, norovirus, Japanese encephalitis virus, rabies virus, poliovirus, echovirus, coxsackievirus group A, coxsackievirus group B, mumps virus, herpes simplex virus, varicella-zoster virus, measles virus, Rubella virus, EB virus, papilloma virus, molluscum contagiosum virus, hand-foot-and-mouth disease virus, acute hemorrhagic conjunctivitis virus, HAV, HBV, HCV, epidemic keratoconjunctivitis virus, hunter virus, human T Viruses such as AMPA virus, HIV, lymphocytic choriomeningitis virus, RS virus, adenovirus, reovirus, rhinovirus, coronavirus; candidiasis, aspergillosis, cryptococcosis, zygomycosis, pneumocystis Examples include fungi that
- Antigens against anti-receptor antibodies such as anti-TSH receptor antibody, anti-acetylcholine receptor antibody, anti-insulin receptor antibody, etc. as carrier antigens that can be used in the present invention in addition to microorganism-derived antigens; anti-thyroglobulin antibodies, anti-microsomes Antigens to anti-thyroid antibodies such as antibodies; Anti-islet cell antibodies, anti-GAD antibodies, antigens to anti-islet antibodies such as anti-insulin antibodies; anti-adrenocortical antibodies, anti-smooth muscle antibodies, anti-LKM antibodies, anti-gastric wall cell antibodies, anti-internal Examples include factor antibodies, anti-striated muscle antibodies, anti-myocardial antibodies, anti-dermal desmoglein antibodies, anti-neutrophil cytoplasmic antibodies, antigens against organ-specific autoantibodies such as antiphospholipid antibodies, and the like.
- a carrier antigen that can be used in the present invention, self-antigens distributed in chromatin such as DNA, nucleosome, histone, poly ADP ribose, centromere, Scl-70, Ku, etc .; U1RNP, Sm, SS-B / LA, SS -Autoantigen distributed in the nucleoplasm such as A / Ro, PCNA, Ki; Autoantigen distributed in the nucleolus such as U3RNP, Th / To, PM-Sci, RNA polymerase; AA-A / Ro, Jo-1 And antigens against non-organ-specific autoantibodies such as self-antigens distributed in the cytoplasm such as ribosome P, mitochondria M2, and signal recognition particles.
- chromatin such as DNA, nucleosome, histone, poly ADP ribose, centromere, Scl-70, Ku, etc .
- the antigen can be carried on the insoluble carrier particles by a physical adsorption method, a chemical bonding method, or a conventional method.
- a liquid containing about 0.1 to 1% by mass of insoluble carrier particles in distilled water or PBS is mixed with the antigen to be carried, and the antigen is carried on the insoluble carrier particles. Can do. Further, the unadsorbed antigen and the antigen-supporting carrier particles are separated by centrifugation and redispersed in an aqueous solvent (usually a buffer solution), whereby a liquid containing physically adsorbed particles can be prepared.
- the buffer include Good buffer such as HEPES buffer, TRIS buffer, glycine buffer, borate buffer, and the like.
- the chemical bonding method uses a functional group on the surface of the insoluble carrier particles to bind a predetermined antigen covalently.
- the functional group on the surface of the insoluble carrier particle is a carboxyl group, a hydroxyl group, or an amino group
- the antigen can be covalently bound to the surface of the insoluble carrier particle by using carbodiimide, bromocyan, or glutaraldehyde as an active agent, respectively.
- the functional group on the surface of the insoluble carrier particles can be activated in advance with the activator and then contacted with the antigen. The activator and the antigen may be contacted with the insoluble carrier particles at the same time.
- the functional group on the surface of the insoluble carrier particle is an aldehyde group or a tosyl group, it is not necessary to use an activator. Furthermore, it is also possible to perform a covalent bond by inserting a spacer molecule such as oligoamino acid or aminocarboxylic acid between the insoluble carrier particles and the antigen.
- the above chemical bonding reaction is carried out in an aqueous solvent (usually a buffer solution), and the obtained chemical bonding particles are redispersed in an aqueous solvent (usually a buffer solution) to thereby contain a chemical bonding particle-containing liquid.
- aqueous solvent usually a buffer solution
- the buffer include Good buffer such as HEPES buffer, TRIS buffer, glycine buffer, borate buffer, and the like.
- the physically adsorbed particles and the chemically bonded particles are stored as a liquid containing insoluble carrier particles in an aqueous solvent.
- the containing liquid of the present invention is a containing liquid containing both physically adsorbed particles and chemically bonded particles, and the solvent is usually a buffer solution.
- the buffer include Good buffer such as HEPES buffer, TRIS buffer, glycine buffer, borate buffer, and the like.
- the containing liquid of the present invention is an aqueous solvent (usually a buffer solution) obtained by combining physically adsorbed particles prepared as a containing liquid of the above-mentioned physically adsorbing particles and chemically bonded particles prepared as a containing liquid of chemically bonded particles. It can produce by mixing in. If the containing liquid containing both a physical adsorption particle and a chemical bond particle is obtained, the preparation methods of the containing liquid of this invention are not limited to this.
- the containing liquid of the present invention may contain, for example, various electrolytes, stabilizers, surfactants, sensitizers and the like as necessary.
- the content ratio of each antigen-supporting carrier particle in the containing liquid of the present invention varies depending on the desired measurement range and sensitivity, but is preferably 10: 1-1: 10 (physically adsorbed particle: chemical bond) in mass ratio. Particles), more preferably 5: 1-1: 5 (physically adsorbed particles: chemically bonded particles), very preferably 3: 1-1: 3 (physically adsorbed particles: chemically bonded particles), most preferably 3 1-1: 2 (physically adsorbed particles: chemically bonded particles).
- the target antibody in the sample is measured, the content of the physically adsorbed particles in the contained liquid or in the case of using the diluted liquid is 0.045% by mass or more in the mixed liquid of the contained liquid and the diluted liquid. There is a tendency that the improvement of the effect commensurate with the increase in the content of the particles is not recognized.
- the antibody is measured using the above-described containing liquid of the present invention. That is, the antigen solution of the present invention is brought into contact with a sample separated from a living body that can contain the target antibody, and the antigen carried on the insoluble carrier particles of the contained liquid and the target antibody in the sample The reaction of the fine particles due to the reaction can be detected.
- the measurement method of the present invention without using a diluent, it is preferably performed using a diluent.
- the sample-containing solution diluted by mixing the diluted solution can be brought into contact with the sample.
- the sample is diluted by adding the diluted solution to the sample.
- the containing liquid of the present invention are brought into contact with each other. It is preferable to use a dilute solution having a volume ratio of 9 times or less with respect to the containing solution of the present invention, and it is particularly preferable to use a dilute solution of 1 to 5 times.
- sample separated from the living body that can contain the target antibody is not particularly limited as long as it may contain the antibody to be measured.
- blood, serum, plasma examples include urine, lymph fluid, stab fluid, spinal fluid, sweat, saliva, gastric fluid, lung lavage fluid, stool, etc.
- blood, serum, and plasma are preferable.
- a sample such as serum can be diluted with physiological saline or the like as necessary. Samples diluted with physiological saline or the like are also included in “samples separated from a living body that may contain a target antibody”. Note that the dilution here is separate from the dilution with the diluent.
- kit of the present invention is a measurement kit for carrying out the measuring method of the present invention, and contains the containing liquid of the present invention and the following diluent as constituents.
- kits of the present invention other than the liquid containing the present invention include standard products of target antibodies to be measured, samples for quality control, diluents, and the like.
- the dilution liquid is preferably a liquid for diluting the “sample separated from the living body that may contain the target antibody” with the liquid containing the present invention, and the measurement of the target antibody is substantially performed.
- the diluent is typically a buffer solution, similar to the containing solution of the present invention. Examples of the buffer include Good buffer such as HEPES buffer, TRIS buffer, glycine buffer, borate buffer, and the like.
- the diluent may contain various electrolytes, stabilizers, surfactants, sensitizers, and the like as necessary.
- the diluent is preferably the same as or similar to the solvent of the containing liquid of the present invention.
- the measurement when performing the measurement method of the present invention using the kit of the present invention, the measurement may be performed without using a diluent, but when using a diluent, A diluted solution having a volume ratio of preferably 9 times or less, particularly preferably 1 to 5 times is used.
- the first reagent that is the in-use diluent is the above-mentioned diluent
- the second reagent that is the latex dispersion is the containing liquid of the present invention.
- a specific example of the kit of the present invention includes these first reagent and second reagent as components.
- Latex Latex used in this example is as follows. (1) Latex for physical adsorption method 0.235 ⁇ m polystyrene latex (hereinafter referred to as physical latex 1) 0.223 ⁇ m polystyrene latex (hereinafter referred to as physical latex 2) ⁇ 0.310 ⁇ m polystyrene latex (hereinafter referred to as physical latex 3)
- Latex loading step (1) Loading by physical adsorption method After adding 0.48 mL of 0.5 M CHES buffer (pH 8.8) to 21.1 mL of 0.09% polystyrene latex-containing solution, 8 mg / mL Helicobacter pylori 0.25 mL of lysate was mixed. After the mixture was stirred at room temperature for 30 minutes, 1.04 mL of 10% BSA solution was added, and the total amount was adjusted to 24.0 mL with purified water. Further, after heat treatment at 56 ° C. for 4 hours, unadsorbed antigen was removed by centrifugation.
- the latex from which the unadsorbed antigen was removed by centrifugation was redispersed in 4.0 mL of 0.01M HEPES buffer (pH 7.4), 0.04 mL of 10% BSA solution was added, and this was added at 56 ° C. for 2 hours. Heat-treated.
- the antigen-adsorbed latex-containing liquid after heating was filtered to prepare a physical adsorption latex having a latex concentration of 0.48%.
- the concentration of the physically adsorbed latex to be prepared can be adjusted as appropriate (Chemicals) The same applies to bonding).
- Latex Dispersion Solution Prepared in 2.5 mL of HEPES buffer (pH 7.4) containing 0.3 M NaCl, 0.8 M L-arginine hydrochloride and 0.2% NaN 3 in (1) above.
- a latex dispersion containing latex was prepared.
- Measurement System The measurement in this example was performed using the turbidity method.
- the first reagent is a diluent (diluted when used), 0.05M HEPES, 0.15M NaCl, 0.5% chondroitin sulfate Na, 0.1% BSA, 0.1% PBC-34, 0 0.1% NaN 3 pH 7.4, remaining amount is purified water.
- the second reagent is a latex dispersion (containing liquid of the present invention), 0.05M HEPES, 0.15M NaCl, 0.4M L-Arg ⁇ HCl, 0.1% NaN 3 , Latex pH 7.4, The remaining amount is purified water.
- the measurement was performed using a biochemical automatic analyzer JCA-BM2250 (JEOL Ltd.).
- the first reagent is mixed with 6.0 ⁇ L of a sample (serum sample) diluted 5-fold with physiological saline in the apparatus and incubated at 37 ° C. for 5 minutes. 20 ⁇ L of the reagent was mixed and reacted at 37 ° C., and the change in absorbance at two wavelengths of a main wavelength of 658 nm and a sub wavelength of 805 nm was measured for about 3 minutes after mixing the second reagent. That is, in this example, the first reagent having a volume ratio of 3 times that of the second reagent was used (dilution ratio: 4 times).
- Example 1 Examination of mixing effect of two types of latex As described above, a physical adsorption latex (physical latex 2) having a particle size of 0.235 ⁇ m carrying a Helicobacter pylori solution in a different manner, and a particle size Using 0.145 ⁇ m chemically bonded latex (Chemical Latex 1), the reactivity of pooled sera was measured when only physical adsorption latex was used, when only chemically bonded latex was used, and when these mixtures were used. This was confirmed using a dilution series (Table 1 and FIG. 1).
- the latex concentration of the second reagent used in the study was 0.15% when only the physical adsorption latex was used, 0.30% when only the chemically bonded latex was used, and the physical adsorption latex when the mixture was used, Chemically bonded latex was 0.15% and 0.30%, respectively.
- Serum samples were then measured to examine the specificity in each case (Table 2).
- the “reactivity units in Table 1” and “units on the vertical axis in FIG. 1” are obtained by multiplying the amount of change in absorbance ( ⁇ OD / min) by 10,000.
- the positive coincidence rate is improved and the specificity is improved while maintaining a high negative coincidence rate.
- the concentration of the physically adsorbed latex and the chemically bonded latex in the second reagent is set to 0 respectively. In the case of .15% and 0.30% (1: 2), favorable results were observed in the overall coincidence rate (Table 2).
- Example 2 Examination of mixing ratio of two kinds of latexes As described above, the second reagent of the physical adsorption latex (physical latex 2) having a particle size of 0.223 ⁇ m carrying the dissolved Helicobacter pylori solution by different methods. The concentration was 0.20%, and chemical-bonded latex particles (chemical latex 1) with a particle size of 0.145 ⁇ m were added thereto so that the concentration would be 0-0.20%. It examined (Table 3).
- the matching rate was improved by increasing the amount of chemically bonded latex.
- concentration of the chemically bonded latex in the second reagent increases to 0%, 0.05%, 0.10%, 0.20%
- the positive coincidence rate is 53%, 67%, 73%, 80 %
- the mixing amount of the physical adsorption latex was 0.20% and exceeded 0.18% (measurement: 0.045%) described later, the elongation of the coincidence rate was suppressed (Table 3). ).
- Example 3 Examination of mixing ratio of two types of latex (1) As described above, the concentration of 0.235 ⁇ m physically adsorbed latex particles (physical latex 1) carrying Helicobacter pylori lysate in a different manner is set to 0.12% in the second reagent, When the chemically bonded latex particles (chemical latex 3) having a diameter of 0.300 ⁇ m were added so as to be 0-0.10%, the reactivity was LZ-H. Using a H. pylori antibody calibrator “Eiken” (Eiken Chemical Co., Ltd.) (Table 4 and FIG. 2), serum samples were then measured for specificity (Table 5). The “reactivity units in Table 4” and “units on the vertical axis in FIG. 2” are obtained by multiplying the change in absorbance ( ⁇ OD / min) by 10,000.
- Example 4 Examination of mixing ratio of two types of latex (2) The examination to the same effect as in Example 3 was performed by further expanding the measurement range.
- the latex used was physical latex 1 and chemical latex 3 as in Example 3.
- Example 5 Examination of the particle size of latex particles As described above, the second reagent of the physical adsorption latex particles (physical latex 1) having a particle size of 0.235 ⁇ m carrying Helicobacter pylori lysate in a different manner. The concentration of 0.15% was added to this, and chemically bonded latex particles having a particle size of 0.245 ⁇ m or 0.300 ⁇ m (chemical latex 2 (medium particle size) and chemical latex 3 (large particle size)) of 0.05 were added thereto. %, And each specificity was examined by measuring serum samples. H. pylori antibody values are LZ-H. It was determined from a calibration curve prepared using a H.
- the overall coincidence rate (a combination of the positive coincidence rate and the negative coincidence rate) was 92% and 88%, respectively, and there was no substantial difference between the two.
- Example 5 the relationship between the display of the concentration of the physical adsorption latex and the chemically bonded latex and the concentration at the time of measurement by 4-fold dilution with the first reagent is as described in Example 1.
- the particle size of the chemically bonded latex and the particle size of the physically adsorbed latex should not substantially affect the specificity of the measurement of the sample separated from the living body, at least for medium to large particle sizes.
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Abstract
Description
さらに本発明は、本発明の測定用試薬(本発明の含有液)及び希釈液を含むことを特徴とする、測定用キット(以下、本発明のキットともいう)を提供する。
上述のように本発明の含有液は、物理吸着粒子、及び、化学結合粒子、の双方を含有する含有液である。
上述したように、物理吸着粒子も化学結合粒子も、共にラテックスとして提供されることが好適である。ラテックスは、水性溶媒中にポリマーの微粒子(ラテックス粒子)が安定に分散したエマルジョンである。
(ア)担持抗原
不溶性担体粒子に対して担持させる抗原は、測定の標的とする抗体と結合可能である限り全く限定されないが、前述のように、「複数物質の混合物」や「大きな分子量の物質の含有物」とすることにより、本発明の効果が好適に発揮される。当該混合物としては、生物由来の抗原性物質が挙げられ、好適には、細菌、ウイルス等の微生物由来の溶解物が挙げられる。例えば、後述した実施例において用いたヘリコバクター・ピロリの溶解物には、ウレアーゼB(UreaseB)、ウレアーゼA(UreaseA)、キャグA(CagA)、フラジェリン(Flagellin)、ヒートショックプロテイン(Heat Shock Protein)、その他の物質、が含有されている。これらのヘリコバクター・ピロリの溶解物に含まれる物質の分子量は、大部分が10000-200000程度である。
抗原の不溶性担体粒子への担持は、物理吸着法、化学結合法、それぞれ常法に従って行うことができる。
本発明の含有液は、物理吸着粒子、及び、化学結合粒子、の双方を含有する含有液であり、その溶媒は、通常、緩衝液である。緩衝液としては、例えば、HEPES緩衝液等のグッド緩衝液、TRIS緩衝液,グリシン緩衝液、ホウ酸緩衝液等が挙げられる。例えば、本発明の含有液は、上記の物理吸着粒子の含有液として作製された物理吸着粒子と、化学結合粒子の含有液として作製された化学結合粒子とを、水性溶媒(通常、緩衝液)中で混合することにより作製することができる。物理吸着粒子、及び、化学結合粒子、の双方を含有する含有液が得られるのであれば、本発明の含有液の作製方法は、これに限定されない。
本発明の測定方法では、上述した本発明の含有液を用いて抗体の測定を行う。すなわち、本発明の含有液を、標的抗体を含有し得る生体から分離されたサンプルと接触させて、当該含有液の不溶性担体粒子に担持された抗原と、当該サンプル中の標的抗体との抗原抗体反応による当該微粒子の反応を検出することができる。希釈液を用いないで本発明の測定方法を行うことも可能であるが、好適には希釈液を用いて行われる。
本発明のキットは、本発明の測定方法を行うための測定用キットであり、本発明の含有液及び下記の希釈液を構成要素として含むものである。
1.ラテックス
本実施例において用いたラテックスは下記の通りである。
(1)物理吸着法を行うラテックス
・0.235μmポリスチレンラテックス(以下、物理ラテックス1という)
・0.223μmポリスチレンラテックス(以下、物理ラテックス2という)
・0.310μmポリスチレンラテックス(以下、物理ラテックス3という)
・0.145μmカルボキシラテックス(以下、化学ラテックス1という)
・0.245μmカルボキシラテックス(以下、化学ラテックス2という)
・0.300μmカルボキシラテックス(以下、化学ラテックス3という)
本実施例の細菌由来の担持抗原としては、ピロリ菌(ヘリコバクター・ピロリ)の調製抗原を用いた。当該細菌由来抗原の調製は、下記の手順で行った。
元菌株を、ヘリコバクター・ピロリ選択分離用ポアメディア(登録商標)HP分離培地(栄研化学株式会社)を用いて、アネロパック(三菱ガス化学株式会社)により微好気環境にし、37℃で培養した。
本培養の培養液は、パールコア(登録商標)ブレインハートインフュジョンブイヨン培地‘栄研’(栄研化学株式会社)に5%馬血清を加えた培養液200mLを用いた。この本培養液に、上記予備培地の単コロニーを釣菌した後、McFarland No.1.0に調整した接種菌液を接種し、微好気ガス下で、37℃で振盪培養を行った。
上記本培養完了後、遠心にて集菌を行い、さらに生理食塩水にて遠心洗浄し、沈殿に溶菌液(0.15M NaCl、0.1% ポリオキシエチレンオクチルフェニルエーテル、5mM EDTA、0.1%NaN3を含む50mM HEPES緩衝液、pH7.4)を添加して、これを凍結融解にて溶菌を行った。
上記のヘリコバクター・ピロリの溶解物を、0.15M NaCl、0.1% NaN3を含むHEPES緩衝液(pH7.4)に対して透析後、遠心上清を得て、これに孔径0.45μmのメンブレンフィルター濾過を施した。当該濾過物を抗原として、抗原調製を完了し、これを「ヘリコバクター・ピロリ溶解物」として、以下の工程に供した。ヘリコバクター・ピロリ溶解物の抗原蛋白濃度はBCA法により測定した。
(1)物理吸着法による担持
0.09%ポリスチレンラテックス含有液21.1mLに0.5M CHES緩衝液(pH8.8)0.48mLを添加した後、8mg/mLのヘリコバクター・ピロリ溶解物0.25mLを混合した。混合液を室温で30分攪拌した後、10%BSA溶液1.04mLを添加し、精製水で全量を24.0mLとした。さらに、56℃で4時間加熱処理した後、遠心分離にて未吸着抗原を除去した。遠心分離にて未吸着抗原を除去したラテックスを0.01M HEPES緩衝液(pH7.4)4.0mLに再分散させ、10%BSA溶液0.04mLを添加した後、これを56℃で2時間加熱処理した。加熱後の抗原吸着ラテックス含有液を濾過し、ラテックス濃度0.48%の物理吸着ラテックスを作製した。
0.3%カルボキシラテックス含有液6.4mLに1-エチル-3-(3-ジメチルアミノプロピル)カルボジイミド塩酸塩をカルボキシル基の2モル等量添加し、15分攪拌反応させカルボキシル基を活性化した。カルボキシル基を活性化させたラテックス含有液に、精製水63.2mL及び0.5M HEPES緩衝液(pH7.0)1.28mLを添加後、8mg/mLのヘリコバクター・ピロリ溶解物0.340mLを混合し、3時間反応させた。反応混合液に10%BSA溶液0.776mLを添加し、4時間反応させた後、遠心分離にて未吸着抗原を除去した。遠心分離にて未結合抗原を除去したラテックスを0.01M HEPES緩衝液(pH7.4)4.0mLに再分散させ、10%BSA溶液0.04mLを添加し、56℃で4時間加熱処理した。加熱後の抗原結合ラテックス含有液を濾過し、ラテックス濃度0.48%の化学結合ラテックスを作製した。
0.3M NaCl、0.8M L-アルギニン塩酸塩及び0.2%NaN3を含むHEPES緩衝液(pH7.4)2.5mLに、前記(1)で調製した物理吸着ラテックス1.563mL及び前記(2)で調製した化学結合ラテックス0.521mLを添加し、精製水にて全量5.0mLとして、0.15%の物理吸着ラテックスと0.05%の化学結合ラテックスを含むラテックス分散液を調製した。
本実施例における測定は、濁度法を用いて行った。
上記のように、異なる方式でヘリコバクター・ピロリ溶解物を担持させた、粒径0.235μmの物理吸着ラテックス(物理ラテックス2)と、粒径0.145μmの化学結合ラテックス(化学ラテックス1)を用いて、物理吸着ラテックスのみを使用した場合、化学結合ラテックスのみを使用した場合、及びこれらの混合物を使用した場合の反応性を、プール血清の希釈系列を用い、確認した(表1・図1)。検討に用いた第2試薬のラテックス濃度は、物理吸着ラテックスのみを使用した場合は0.15%、化学結合ラテックスのみを使用した場合は0.30%、混合物を使用した場合は物理吸着ラテックス、化学結合ラテックス、それぞれ0.15%、0.30%とした。次いで血清サンプルを測定して、それぞれの場合の特異性を検討した(表2)。なお、「表1の反応性の単位」と「図1の縦軸の単位」は、吸光度変化量(ΔOD/min)を10000倍したものである。
上記のように、異なる方式でヘリコバクター・ピロリ溶解物を担持させた、粒径0.223μmの物理吸着ラテックス(物理ラテックス2)の第2試薬中の濃度を0.20%とし、これに粒径0.145μmの化学結合ラテックス粒子(化学ラテックス1)を0-0.20%となるように添加して、血清サンプルを測定し特異性を検討した(表3)。
上記のように、異なる方式でヘリコバクター・ピロリ溶解物を担持させた、粒径0.235μmの物理吸着ラテックス粒子(物理ラテックス1)の第2試薬中の濃度を0.12%として、これに粒径0.300μmの化学結合ラテックス粒子(化学ラテックス3)を0-0.10%となるように添加した場合の、反応性をLZ-H.ピロリ抗体キャリブレータ‘栄研’(栄研化学株式会社)を用いて検討し(表4・図2)、次いで、血清サンプルを測定して特異性を検討した(表5)。なお、「表4の反応性の単位」と「図2の縦軸の単位」は、吸光度変化量(ΔOD/min)を10000倍したものである。
実施例3と同趣旨の検討を、さらに測定範囲を拡大して行った。用いたラテックスは、実施例3と同様に物理ラテックス1と化学ラテックス3である。
上記のように、異なる方式でヘリコバクター・ピロリ溶解物を担持した、粒径を0.235μmの物理吸着ラテックス粒子(物理ラテックス1)の第2試薬中の濃度を0.15%とし、これに粒径0.245μm又は0.300μmの化学結合ラテックス粒子(それぞれ化学ラテックス2(中粒径)、化学ラテックス3(大粒径))を0.05%混合して、それぞれの特異性を、血清サンプルを測定して検討した。H.ピロリ抗体値は、LZ-H.ピロリ抗体キャリブレータ‘栄研’(栄研化学株式会社)を用いて作成した検量線から求めた。その結果、全体の一致率(陽性一致率と陰性一致率を併せたもの)が、それぞれ92%と88%で、双方実質的な差異は認められなかった。
なお、本実施例5においても、物理吸着ラテックスと化学結合ラテックスの濃度の表示と、第1試薬による4倍希釈による測定時のそれらの濃度の関係は、実施例1に記載した通りである。
Claims (11)
- 物理吸着により所定の抗原が担持された不溶性担体粒子、及び、化学結合により当該抗原が担持された不溶性担体粒子、の双方を含有する不溶性担体粒子の含有液を、標的抗体を含有し得る生体から分離されたサンプルと接触させて、当該担体粒子に担持された抗原と、当該サンプル中の標的抗体との抗原抗体反応による当該担体粒子の凝集反応を検出することを特徴とする、抗体測定方法。
- 所定の抗原は、複数物質の混合物であることを特徴とする、請求項1に記載の抗体測定方法。
- 複数物質の混合物は、微生物由来の溶解物であることを特徴とする、請求項2に記載の抗体測定方法。
- 所定の抗原は、分子量が5000以上の物質を少なくとも1種含むことを特徴とする、請求項1-3のいずれか1項に記載の抗体測定方法。
- 不溶性担体粒子は、ラテックス粒子であることを特徴とする、請求項1-4のいずれか1項に記載の抗体測定方法。
- 生体から分離されたサンプル中の標的抗体との抗原抗体反応による当該担体粒子の反応を検出するための抗体の測定用試薬であって、物理吸着により所定の抗原が担持された不溶性担体粒子、及び、化学結合により当該抗原が担持された不溶性担体粒子、の双方を含有する不溶性担体粒子の含有液であることを特徴とする、抗体の測定用試薬。
- 所定の抗原は、複数物質の混合物であることを特徴とする、請求項6に記載の測定用試薬。
- 複数物質の混合物は、微生物由来の溶解物であることを特徴とする、請求項7に記載の測定用試薬。
- 所定の抗原は、分子量が5000以上の物質を少なくとも1種含むことを特徴とする、請求項6-8のいずれか1項に記載の測定用試薬。
- 不溶性担体粒子は、ラテックス粒子であることを特徴とする、請求項6-9のいずれか1項に記載の測定用試薬。
- 請求項6-10のいずれか1項に記載の測定用試薬及び希釈液を含むことを特徴とする、測定用キット。
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WO2023190003A1 (ja) * | 2022-03-29 | 2023-10-05 | ミナリスメディカル株式会社 | シアリルルイス抗原の測定方法、測定用試薬及び測定用キット |
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CN109642899B (zh) | 2024-03-08 |
EP3508849A4 (en) | 2020-04-01 |
CN109642899A (zh) | 2019-04-16 |
EP3508849B1 (en) | 2023-04-19 |
JP6918808B2 (ja) | 2021-08-11 |
JPWO2018043584A1 (ja) | 2019-06-24 |
KR102505384B1 (ko) | 2023-03-06 |
TWI757328B (zh) | 2022-03-11 |
AU2017321642B2 (en) | 2024-06-13 |
TW201812302A (zh) | 2018-04-01 |
EP3508849A1 (en) | 2019-07-10 |
AU2017321642A1 (en) | 2019-04-11 |
KR20190067779A (ko) | 2019-06-17 |
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