WO2005111618A1 - 物質固定化剤、それを用いた物質固定化方法及びそれを用いた物質固定化基体 - Google Patents
物質固定化剤、それを用いた物質固定化方法及びそれを用いた物質固定化基体 Download PDFInfo
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- WO2005111618A1 WO2005111618A1 PCT/JP2005/009100 JP2005009100W WO2005111618A1 WO 2005111618 A1 WO2005111618 A1 WO 2005111618A1 JP 2005009100 W JP2005009100 W JP 2005009100W WO 2005111618 A1 WO2005111618 A1 WO 2005111618A1
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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
- G01N33/54393—Improving reaction conditions or stability, e.g. by coating or irradiation of surface, by reduction of non-specific binding, by promotion of specific binding
Definitions
- the present invention relates to a substance immobilizing agent for immobilizing a desired substance such as a polypeptide, a nucleic acid, or a lipid on a substrate, a substance immobilizing method using the same, and a substance immobilizing method using the same. It relates to a dani base.
- the method using physical adsorption while applying force has a problem in that the stability of the substrate obtained by fixing a substance having a weak bond between the substrate and the fixing material is insufficient.
- proteins such as serum albumin (BSA), casein, skim milk, etc.
- BSA serum albumin
- skim milk casein
- DNA DNA
- a protein or nucleic acid is immobilized on a substrate by covalently bonding a functional group on the substrate and a functional group of a protein or nucleic acid to be immobilized.
- the functional group used is in or near the active site of the substance, the activity of the substance is lost by immobilization.
- the immobilization cannot be performed by this method.
- non-specific adsorption is prevented by blocking, but its effect is not always satisfactory. Not something that can be done.
- Patent Document 1 Japanese Patent Laid-Open No. 11 337551
- Patent Document 2 JP 2001-337089 A
- Non-Patent Document 1 Y. Ito and M. Nogawa, Preparation of a protein micro-array using a photo-reactive polymer for a cell adhesion assay, "Biomaterials, 24, 3021-3026 (2003)
- Non-Patent Document 2 One Dictionary of Nanotechnology (Published by the Industrial Research Institute, Ltd. (December 25, 2003)) Pages 838-839
- Non-Patent Document 3 Japan Nanonet Bulletin No. 58 (March 16, 2004)
- an object of the present invention is to provide a substance immobilizing agent which can fix various substances to be immobilized on a substrate by covalent bonding and has an excellent effect of preventing non-specific adsorption.
- An object of the present invention is to provide a material fixing method using the same and a substance fixing substrate using the same.
- an object of the present invention is to enable a desired substance such as a polypeptide, a nucleic acid, or a lipid to be immobilized on a metal surface such as gold regardless of its type, and to suppress nonspecific adsorption. It is an object of the present invention to provide a substance immobilizing agent, a method for immobilizing a substance using the same, and a substance immobilizing substrate using the same.
- the inventors of the present invention have conducted intensive studies and have found that a mixture of a photocrosslinking agent having at least two photoreactive groups in one molecule and a water-soluble polymer that is electrically neutral as a whole molecule. It has been found that by using as a substance immobilizing agent, various substances to be immobilized on a substrate can be immobilized by covalent bonding, and the effect of preventing non-specific adsorption is excellent. 7 bats.
- the present invention provides a desired substance on a substrate, comprising: a photocrosslinking agent having at least two photoreactive groups in one molecule; and a water-soluble polymer that is electrically neutral as a whole molecule.
- a substance immobilizing agent for immobilizing the compound to provide a substance immobilizing agent for immobilizing the compound.
- the present invention provides a method for applying an aqueous solution or aqueous suspension containing a substance to be immobilized on a substrate and the substance-immobilizing agent of the present invention to the substrate, and irradiating the substrate with light.
- a method for fixing a substance is provided.
- the present invention provides a substrate on which the substance is immobilized by the method of the present invention.
- an amphoteric or nonionic water-soluble compound having a photoreactive group and having a group capable of covalently bonding or coordinating with a metal By using a polymer as a substance fixing agent for fixing a desired substance, a desired substance can be fixed to a metal and an interaction with the desired substance can be examined. It has been found that non-specific adsorption of other substances can be effectively suppressed. Further, instead of the above water-soluble polymer, a bipolar or non-ionic water-soluble polymer having at least two photoreactive groups in one molecule and a group capable of forming a covalent bond or a coordination bond with a metal can be used.
- a mixture with a compound having the above formula, or an amphoteric or nonionic water-soluble polymer It has been found that a similar effect can be obtained by using a mixture of a photocrosslinking agent having at least two photoreactive groups in a molecule and a compound having a group capable of covalently bonding or coordinating with a metal. .
- the present invention relates to a bipolar or non-ionic water-soluble polymer having at least one photoreactive group and capable of forming a covalent bond or a coordinate bond with a metal.
- a substance fixing agent for fixing a substance to a metal comprising a polymer having the same.
- the present invention relates to a bipolar or non-ionic water-soluble polymer having at least two photoreactive groups in one molecule and capable of forming a covalent bond or a coordinate bond with a metal.
- a substance immobilizing agent for immobilizing a substance on a metal which comprises a low-molecular compound having a basic group.
- the present invention provides a water-soluble polymer having an ambipolar or nonionic nature, a photocrosslinking agent having at least two photoreactive groups in one molecule, and a group capable of covalently bonding or coordinating with a metal.
- a substance fixing agent for immobilizing a substance on a metal comprising: Further, in the present invention, an aqueous solution or an aqueous suspension containing the substance to be immobilized on the substrate and the substance fixing agent or the substance fixing agent of the present invention is applied to the substrate and irradiated with light.
- a method for immobilizing a substance on a substrate comprising: Further, the present invention provides a substrate on which the substance is immobilized on a metal by the method of the present invention.
- a substance immobilizing agent which can immobilize various substances to be immobilized on a substrate by covalent bonding and has an excellent effect of preventing non-specific adsorption, A method for fixing a substance and a substrate for fixing the substance using the same are provided.
- a substance to be immobilized can be fixed by a covalent bond regardless of its type, and a stable fixed substrate can be obtained. Further, when the substance is fixed using the substance fixing agent of the present invention, non-specific adsorption is effectively prevented.
- the patterning of the immobilized substance can be performed by performing selective exposure, and the substance can be easily formed into an arbitrary pattern such as a microarray. It can be fixed.
- a desired substance such as a polypeptide, a nucleic acid, or a lipid can be immobilized on a metal surface such as gold irrespective of its type, and nonspecific adsorption can be suppressed.
- a solid substance fixing agent was provided. Since the photoreactive group also bonds to a carbon atom in the organic compound, the use of the substance fixing agent of the present invention enables the organic substance to be fixed to the metal surface regardless of the type. In addition, nonspecific adsorption is effectively suppressed by the bipolar or nonionic water-soluble polymer. Therefore, the present invention is considered to greatly contribute to QCM measurement and SPR measurement of the interaction between various biomolecules and other substances.
- FIG. 1 is a diagram showing the relationship between the average surface roughness of a substrate and the luminescence intensity in the immunoassay performed in Example 3 of the present invention.
- FIG. 2 is a diagram schematically showing a method of performing QCM measurement using a crystal resonator microbalance measurement device.
- FIG. 3 shows a time-dependent change in frequency when QCM measurement is performed on a reaction between the substance fixing agent prepared in Example 6 of the present invention and a gold electrode of a sensor chip of a quartz crystal microbalance measuring device.
- FIG. 4 is a diagram showing a time-dependent change in frequency when QCM measurement was performed on the antigen-antibody reaction of Example 1.
- the substance immobilizing agent according to the first aspect of the present invention comprises a photocrosslinking agent having at least two photoreactive groups in one molecule and a water-soluble electrically neutral molecule as a whole. And a hydrophilic polymer.
- Preferable examples of the photoreactive group possessed by the photocrosslinking agent include an azide group (-N).
- photocrosslinking agent a diazide conjugate having two azide groups is preferable, and a water-soluble diazido conjugate is particularly preferable.
- the photocrosslinking agent used in the present invention include a diazide conjugate represented by the following general formula [III]. [0020] [Formula 1]
- R represents a single bond or an arbitrary group.
- -R- is not particularly limited, because it has a structure only connecting two phenylazide groups.
- Preferred examples of -R- include a single bond (that is, two ferrazide groups are directly connected) and an alkylene group having 1 to 6 carbon atoms (including one or two carbon-carbon unsaturated bonds. One or two carbon atoms may be double-bonded to oxygen to form a carboxy group,) (particularly preferably a methylene group), -0-, -SO-, -SS-, -S-,-R 2 JJ_LY R 3- (However, Nini has a single or double bond.
- Y represents a cycloalkylene group having 3 to 8 carbon atoms
- R 2 and R 3 each independently represent an alkylene group having 1 to 6 carbon atoms (which may contain one or two carbon-carbon unsaturated bonds, The bond between the carbon atom at the base end of the alkylene group and Y may be a double bond), and one or two carbon atoms are double-bonded to oxygen to form a carboxy group, ),
- the cycloalkylene group may be substituted with one or more optional substituents (if substituted, preferably the carbon atom constituting the cycloalkylene group) , One or two of which is double-bonded to oxygen to form a carbonyl group, and is substituted by Z or 1 or 2 alkyl groups having 1 to 6 carbon atoms.
- each benzene ring in the general formula [II] may have one or more optional substituents (preferably Alternatively, it may be substituted with a halogen, an alkoxyl group having 1 to 4 carbon atoms, or a hydrophilic group such as sulfonic acid or a salt thereof.
- Water-soluble for an optical crosslinking agent refers to an aqueous solution having a concentration of 0.5 mM or more, preferably 2 mM or more. It means that you can exempt.
- the concentration of the photocrosslinking agent when used is not particularly limited, but is preferably 1 M to 2 mM, more preferably O. OlmM to 0.5 mM. .
- the amount added to the water-soluble polymer is not particularly limited, but is preferably 0.1 to 50% by weight, particularly 1 to 30% by weight, and more preferably 1 to 10% by weight.
- the water-soluble polymer contained in the substance immobilizing agent of the present invention is a water-soluble polymer that is electrically neutral as a whole molecule.
- ⁇ electrically neutral as a whole molecule '' means that the compound does not have a group that becomes ionized by ionization in an aqueous solution having a neutral pH (pH 6 to 8)! ! /, Which has both cations and anions, meaning that the sum of its charges is substantially zero.
- “substantially” means a force that becomes the total force of the electric charge ⁇ , or a force that is small enough to not adversely affect the effect of the present invention even if it does not become zero.
- the solubility of the water-soluble polymer used in the present invention in water is preferably 5 or more.
- Preferable examples of the water-soluble polymer include a non-ionic water-soluble polymer.
- the nonionic water-soluble polymer has an excellent effect of preventing non-specific adsorption, and has the advantage that it can be produced or obtained at low cost.
- non-ionic means that there is substantially no group that becomes an ion when ionized in an aqueous solution having a pH around neutrality (pH 6 to 8).
- substantially means that such a group is not contained at all or is contained in such a small amount that does not adversely affect the effects of the present invention (for example, the number of such groups is small). (1% or less of carbon number).
- the molecular weight (average molecular weight, the same applies hereinafter) of the nonionic water-soluble polymer is not particularly limited. Usually, the molecular weight of the nonionic water-soluble polymer is about 3.5 to 5,000,000. Crosslinking between the functional polymers increases, and a reaction occurs between the immobilized material and the material used for the reaction with the immobilized material (hereinafter, may be referred to as “reactant” for convenience). Since it may be difficult, it is preferable to be about 500 to several hundred thousand.
- Preferred nonionic water-soluble polymers used in the present invention include, for example, polyalkylene glycols such as polyethylene glycol (PEG) and polypropylene glycol; Norecone, methyl vinyl ether, vinylpyrrolidone, vinyloxazolidone, bininolemethyloxazolidone, 2-butylpyridine, 4-butylpyridine, N-bulsuccinimide, N-bulformamide, N-bul-N-methylformamide , N-butylacetamide, N-ville-N-methylacetamide, 2-hydroxyethyl methacrylate, polyethylene glycol methacrylate, polyethylene glycol acrylate, acrylamide, methacrylamide, ⁇ , ⁇ -dimethyl Acrylamide, ⁇ -iso-propylacrylamide, diacetone acrylamide, methylol acrylamide, atariloylmorpholine, atariloylpyrrolidine, atariloylbiperidine, st
- Gelatin casein, collagen, gum arabic, xanthan gum, gum tragacanth, guar gum, pullulan, pectin, sodium alginate, hyaluronic acid, chitosan, chitin derivatives, color -Nan, starches (carboxymethyl starch, aldehyde starch), natural polymers such as dextrin, cyclodextrin, methylcellulose, viscose, hydroxyxetinoresenolerose, hydroxyethinomethinoresenorelose, canoleboximetinolose Examples include, but are not limited to, natural polymers such as water-soluble cellulose derivatives such as cellulose and hydroxypropylcellulose.
- polyethylene glycol-based polymers polyethylene glycol, vinyl polymer of vinyl conjugate having a polyethylene glycol moiety
- poly (meth) acrylamide in the present specification and claims, "( “Meth) acryl” means “methacryl” or “acryl”) and poly (glycidyl (meth) atalylate), of which polyethylene glycol-based polymers are particularly preferred.
- the water-soluble polymer include a water-soluble polymer having a unit having a structure represented by the following general formula [I].
- unit [1] The unit having the structure represented by the general formula [I] may be hereinafter referred to as "unit [1]" for convenience.
- the above-mentioned phosphorylcholine-containing polymer utilizes a polymer containing phosphorylcholine, which is a component of the biomembrane, focusing on the fact that nonspecific adsorption hardly occurs even though the biomembrane is in contact with various substances.
- the present invention has been made based on the idea that non-specific adsorption can be effectively prevented by immobilizing a desired substance on a substrate.
- the unit [I] is a unit containing a phosphorylcholine group, and X represents a polymerizable atomic group in a polymerized state. X is preferably a bullet monomer residue.
- X is preferably a bullet monomer residue.
- X ′ represents a methacryloxy group, a methacrylamide group, an acryloxy group, an acrylamide group, a styryloxy group or a styrylamide group in which the vinyl moiety is obtained by addition polymerization
- R 1 is a single bond Or carbon number 1 to: represents an alkylene group of LO (however, it may be substituted with one or two hydroxy groups).
- Preferable specific examples of such a unit include 2-methacryloyloxyshethylphosphorylcholine, 2-atalyloyloxhetylphosphorylcholine, N- (2-methacrylamido) ethylphosphorylcholine, and 4-methacryloyloxy.
- a unit derived from 2-methacryloyloxetyl phosphorylcholine is particularly preferred.
- the water-soluble polymer containing the unit [I] may be a polymer obtained by polymerizing only the unit [I].
- a copolymer of the unit [I] and another polymerizable monomer that does not adversely affect the effects of the present invention.
- the other polymerizable monomer (meth) acrylic acid or a salt or ester thereof (preferably lower alkyl (C1-6) ester) is particularly preferable, which is preferably a vinyl monomer.
- the ratio of the unit [I] constituting the copolymer to another polymerizable monomer is not particularly limited, but is preferably 1: 0.7 or less, particularly preferably 1: 0.5 or less in molar ratio. .
- a compound having both a hydrophilic group and a hydrophobic group is used as the photocrosslinking agent
- a monomer containing both a hydrophilic group and a hydrophobic group such as alkyl (meth) acrylate (preferably having 3 to 6 carbon atoms in the alkyl moiety) is used. It is preferred to polymerize.
- the molecular weight of the water-soluble polymer containing the unit [I] is not particularly limited, but is usually about 1,000 to 2,000,000, preferably about 5,000 to 1,500,000.
- the concentration of the water-soluble polymer when used is not particularly limited, but is usually 0.005% by weight to 10% by weight, preferably 0.04% by weight to 1% by weight. %.
- the substance fixing agent of the present invention may further contain a solvent in addition to the above-mentioned photocrosslinking agent and water-soluble polymer.
- a solvent water, lower alcohol (preferably ethanol) which is mixed with water in an arbitrary ratio, and a mixture thereof can be used, and water is preferred.
- the photocrosslinking agent and the water-soluble polymer contained in the substance immobilizing agent of the present invention are known per se, can be produced by a known production method, and some are commercially available.
- the substance immobilized using the substance immobilizing agent of the present invention is not particularly limited, but includes polypeptides (including glycoproteins and lipoproteins), nucleic acids, lipids, and cells (animal cells, plant cells). , Microbial cells, etc.) and their components (nuclei, mitochondria, etc. Organelles, cell membranes and membranes such as unit membranes).
- the azide group used as a photoreactive group in the substance immobilizing agent of the present invention releases a nitrogen molecule upon irradiation with light and generates a nitrogen radical, and this nitrogen radical is an amino group ⁇ ⁇ ⁇ a carboxyl group or the like. Since it is possible to bond not only to a functional group but also to a carbon atom constituting an organic compound, almost all organic substances can be fixed.
- the substrate is not particularly limited as long as at least its surface is made of a substance capable of binding to the photoreactive group.
- the substrate include polystyrene widely used in microplates and the like, acrylic resin, and acrylic resin. Examples which can also have organic properties such as polyethylene terephthalate, polycarbonate and polypropylene can be given.
- a glass plate coated with a silane coupling agent can also be used. Further, those obtained by organically treating the gold surface with an alkyl thiol or the like can be preferably used.
- the form of the base is not limited, and a plate-like one such as a microarray substrate, a bead-like one, a fibrous one, or the like can be used.
- the substance immobilizing agent of the present invention is particularly suitable for microarrays. Further, when the average surface roughness of the substrate is 14 / zm to 17 / ⁇ , particularly 15 ⁇ m, the reaction between the substance to be immobilized and the reactant is particularly likely to occur, so that it is preferable.
- the average surface roughness can be measured by a commonly used surface roughness meter.
- the immobilization of a desired substance on a substrate using the substance immobilizing agent of the present invention can be performed as follows. First, an aqueous solution or an aqueous suspension containing the substance to be fixed on the substrate and the substance fixing agent of the present invention is applied to the substrate. In this case, preferred concentrations of each component of the substance fixing agent in the aqueous solution are as described above.
- the concentration (by weight) of the substance to be immobilized is usually about 10 to 200 times, preferably about 20 to 100 times, the substance immobilizing agent used.
- the applied liquid is preferably dried and then irradiated with light.
- the light is light by which the photoreactive group used can generate a radical.
- an azide group is used as the photoreactive group, ultraviolet light is preferable.
- the dose of the irradiated light beam is not particularly limited, but is usually about lmW to 100 mW per 1 cm 2 .
- a photoreactive group in the photocrosslinking agent By irradiating light, a photoreactive group in the photocrosslinking agent generates a radical, and the photocrosslinking agent is covalently bonded to both the substrate and the substance to be immobilized. As a result, the substance to be immobilized is immobilized on the substrate via the photocrosslinking agent.
- the water-soluble polymer is also immobilized on the substrate via the photocrosslinking agent.
- the azide group used as a photoreactive group emits nitrogen molecules upon irradiation with light and generates nitrogen radicals.
- These nitrogen radicals are not only functional groups such as amino groups and carboxyl groups but also organic compounds. Since most of the organic substances can be fixed, it can be bonded to the constituent carbon atoms. In the method of the present invention, since a binding reaction is carried out by using a radical generated by a photoreactive group, the binding is carried out at a random site rather than at a particular site of the substance to be fixed.
- the photoreactive group does not bind to the substrate and the substance to be immobilized in the vibrating portion not irradiated with light
- the photocrosslinking agent and the substance to be immobilized are removed by washing. Therefore, by performing selective exposure through a photomask or the like, a substance to be fixed can be fixed in an arbitrary pattern. Therefore, the substance to be fixed in various shapes such as a microarray can be fixed by selective exposure, which is very advantageous.
- a mixture of the substance immobilizing agent of the present invention and the substance to be immobilized may be microspotted on a substrate, and the entire surface of the substrate may be irradiated with light.
- Microspotting is a method of applying a liquid to a very narrow area on a substrate, and is commonly used for the production of DNA chips and the like.Equipment for this is also commercially available. be able to.
- the substance-immobilizing agent of the present invention may be coated on the entire surface of the substrate, microspotted with the substance to be immobilized thereon, and then the entire surface of the substrate may be irradiated with light.
- a spot of the substance to be immobilized is formed on the layer of the substance immobilizing agent, and the proportion of the substance that is covalently immobilized on the substrate via the photocrosslinking agent increases.
- the substance immobilizing agent of the present invention is microspotted on a substrate, and immobilized thereon. The substance to be formed may be microspotted, and then the entire surface of the substrate may be irradiated with light. In this case as well, a spot of the substance to be immobilized is formed on the layer of the substance immobilizing agent (separated spots) and is immobilized covalently to the substrate via a photocrosslinking agent. Is higher.
- the method of the present invention includes preparing an immunoassay plate on which an antibody or an antigen-binding fragment thereof or an antigen is immobilized, a nucleic acid chip on which DNA or RNA is immobilized on a substrate, a microarray, or the like.
- an immunoassay plate on which an antibody or an antigen-binding fragment thereof or an antigen is immobilized
- a nucleic acid chip on which DNA or RNA is immobilized on a substrate, a microarray, or the like.
- the present invention can also be applied to immobilization of whole cells and components thereof.
- the substance immobilizing agent according to the second aspect of the present invention is a bipolar or non-ionic water-soluble polymer, having one or more photoreactive groups, Further, it is composed of a polymer having a group capable of covalently bonding or coordinating with a metal.
- the term “ambipolar” refers to a group having a group which becomes a cation and a group which becomes an anion when ionized in an aqueous solution having a pH around neutrality (pH 6 to 8), and the sum of the charges is substantially equal. Means 0.
- “substantially” also mean that small enough not to adversely affect the effects of the present invention as not to force or 0 to a total force s ⁇ charge.
- nonionic means that there is substantially no group that becomes ionized by ionization in an aqueous solution having a pH near neutrality (pH 6 to 8).
- substantially means that such a group is not contained at all, or even if contained, in such a small amount that the effect of the present invention is not adversely affected (for example, when the number of such groups is (1% or less of the prime number).
- the solubility of the water-soluble polymer in water is preferably 5 or more.
- photoreactive group examples include an azido group (-N).
- Preferable examples of the water-soluble polymer used in the present invention include a unit having a structure represented by the following general formula [I] (same as the above general formula D) and a unit represented by the following general formula [ ⁇ ] Examples include a polymer containing a unit having a structure.
- the preferred water-soluble polymer described below has a photoreactive group, but a group capable of covalent or coordinating with a metal has not been introduced yet. A group capable of covalent or coordinating with a metal is added to the water-soluble polymer later. Introduced by the method described in.
- X and Y each independently represent a polymerizable atomic group in a polymerized state
- R 1 represents an atomic group having a photoreactive group.
- the units represented by the general formulas [I] and [II] are as follows: [I] is 2 or more, [II] is 1 or more, and the number of units represented by the general formula [I] Is greater than the number of units represented by the general formula [II]).
- unit [1] A unit having the structure represented by the general formula [I] may be referred to as “unit [1]” for convenience in the present specification as described above.
- the unit having the structure represented by may be hereinafter referred to as “unit [11]” for convenience.
- the phosphorylcholine-containing polymer uses a polymer containing phosphorylcholine which is a constituent of the biomembrane.
- the invention was invented based on the idea that non-specific adsorption could be effectively prevented by immobilizing a desired substance on a substrate.
- the unit [I] is a unit containing a phosphorylcholine group, and X represents a polymerizable atomic group in a polymerized state. X is preferably a bullet monomer residue.
- a unit represented by the following general formula [r] (same as the above general formula [r]) is preferable. [0068] [Formula 12]
- X ′ represents a methacryloxy group, a methacrylamide group, an acryloxy group, an acrylamide group, a styryloxy group or a styrylamide group in which a butyl moiety is subjected to addition polymerization to form a R
- Such a unit include 2-methacryloyloxyshethylphosphorylcholine, 2-atalyloyloxhetylphosphorylcholine, ⁇ - (2-methacrylamido) ethyl phosphorylcholine, and 4-methacryloyloxy. Derived from butylphosphorylcholine, 6-methacryloyloxyhexylphosphorylcholine, 10-methacryloyloxydecylsylphosphorylcholine, ⁇ -methacryloyldioxyethylenephosphorylcholine, or 4-styroxybutylphosphorylcholine (that is, these units are polymerized). Units). Among these, a unit derived from 2-methacryloyloxetyl phosphorylcholine is particularly preferred.
- photoreactive group in the unit [II] include an azido group (- ⁇ ).
- the present invention is not limited to this.
- ⁇ in the general formula [II] a vinyl monomer residue is preferable.
- Preferred examples of the unit [II] include those represented by the following general formula [VI].
- Y ′ represents a methacryloxy group, a methacrylamide group, an acryloxy group, an acrylamide group, a styryloxy group or a styrylamide group in a state in which the bullet portion undergoes addition polymerization
- R 2 represents a single bond
- the number of the units [I] is larger than the number of the units [II], and the ratio thereof is not particularly limited, but is preferably about 100: 1 to 100: 50, particularly 100: 1 to: LOO: 20. The degree is preferred.
- the polymer mainly includes the unit [I] having a phosphorylcholine group, nonspecific adsorption is effectively prevented.
- the molecular weight of the water-soluble polymer is not particularly limited, but is usually about 1,000 to 2,000,000, preferably about 5,000 to 1,500,000.
- the water-soluble polymer may include a unit derived from another polymerizable monomer in a range that does not adversely affect the effects of the present invention.
- the proportion of such other units is not particularly limited as long as it does not adversely affect the effects of the present invention, but is usually 70 mol% or less, preferably 50 mol% or less, of all units in the polymer. .
- Preferred examples of the water-soluble polymer include those represented by the following general formula [V].
- n and m are independent of each other, n is an integer of 2 or more, m is an integer of 1 or more, and n is a unit containing X ′ which is larger than m Units containing the position and Y 'are linked in a random order.
- n is a unit in which the phosphorylcholine-containing unit larger than m and the azidophenol group-containing unit are bonded in random order.
- n is preferably from 10 to 6000, and m 'is preferably from 1 to 200.
- the water-soluble polymer can be produced by simply polymerizing the units [I] and [II].
- a main chain polymer containing no side chain (phosphorylcholine group-containing group and photoreactive group-containing group) may be synthesized first, and the side chain may be bonded later.
- the unit [I] having a phorolylcholine group-containing group and the unit [II] having no photoreactive group may be first polymerized, and the photoreactive group-containing group may be bonded later.
- the following embodiment employs this method.
- the polymerization of the monomer and the bonding of the side chains can be easily carried out according to the common technical knowledge of those skilled in the art, and one example is specifically described in the following Examples.
- the phosphorylcholine-containing water-soluble polymer described above preferably has a free carboxyl group in order to introduce a group capable of covalent bonding or coordination bonding with a metal, as described later. .
- a free carboxyl group has a power to further copolymerize a carboxyl group-containing vinyl monomer such as methacrylic acid or acrylic acid, or a light to react when a photoreactive group-containing group is bonded to a side chain.
- the number of moles of free carboxyl groups is preferably about 5% to 50%, based on the total number of moles of all units constituting the water-soluble polymer molecule.
- a non-ionic water-soluble polymer in addition to the above-mentioned ambipolar polymer containing a phosphorylcholine moiety, a non-ionic water-soluble polymer can also be preferably used.
- the non-ionic water-soluble polymer has the same nonspecific adsorption preventing effect as the above-mentioned phosphorylcholine-containing polymer, but has the advantage that it can be produced or obtained at a lower cost than the phosphorylcholine-containing polymer.
- the molecular weight of the non-ionic water-soluble polymer is not particularly limited, but is usually about 350 to 5,000,000, preferably about 500 to several hundred thousand.
- a preferred example of such a non-ionic water-soluble polymer is polyethylene glycol.
- Polyalkylene glycols such as (PEG) and polypropylene glycol; Burr alcohol, methyl vinyl ether, vinylpyrrolidone, vinyloxazolidone, vinylmethyloxazolidone, 2-bulpyridine, 4-bulpyridine, N-bulsuccinimide, N-bulpho Lumamide, N-Butyl-N-methylformamide, N-Buruacetoamide, N-Buru-N-methylacetoamide, 2-hydroxyethyl methacrylate, polyethylene glycol methacrylate, polyethylene glycol acrylate, acrylamide, methacryl Amide, ⁇ , ⁇ -dimethylacrylamide, ⁇ -iso-propylacrylamide, diacetone acrylamide, methylolatarylamide, atariloylmorpholine, atariloylpyrrolidine, atariloylbiperidine, Tylene, chloromethylstyrene, bromomethylstyrene, butyl acetate, methyl me
- Examples include, but are not limited to, natural polymers. Of these, particularly preferred are polyethylene glycol-based polymers, poly (meth) acrylamide and poly (glycidyl (meth) atalylate). Of these, polyethylene glycol-based polymers are particularly preferred. Polyethylene glycol (meth) acrylate.
- the above-mentioned non-ionic water-soluble polymer has a photoreactive group.
- the number of photoreactive groups per molecule of the nonionic water-soluble polymer is not particularly limited as long as it is one or more, but two or more are preferred. Since the adsorption may increase, the number of carbon atoms constituting the polymer (not including the carbon in the side chain) is preferably 10% or less, more preferably 5% or less.
- Azide group (-N) is a preferred example of the photoreactive group.
- the photoreactive group examples include a phenylazide group, an acetyl group and a benzoyl group. Particularly preferred is a phenylazide group.
- the photoreactive group such as an azide group may be directly bonded to the non-ionic water-soluble polymer, but may be bonded to the non-ionic water-soluble polymer via an arbitrary spacer structure. Usually, the latter is preferable because of easy production.
- the spacer structure includes, but is not limited to, an alkylene group having 1 to 10 carbon atoms (however, it may be substituted with one or two hydroxyl groups), a phenylene group. (However, it may be substituted with 1-3 alkyl groups or hydroxyl groups having 1 to 4 carbon atoms).
- a photoreactive group into the non-ionic water-soluble polymer can be easily carried out by a conventional method.
- a nonionic water-soluble polymer having a functional group can be reacted with an azide compound having a functional group that reacts with the functional group to bond the azide group to the non-ionic water-soluble polymer.
- polyethylene diol glycol which is a preferred zo-on water-soluble polymer
- polyethylene glycol having an amino group and a carboxyl group at both ends is commercially available.
- the azide group containing the azide group is reacted with the functional group of Can be combined.
- nonionic water-soluble polymer when the nonionic water-soluble polymer is formed by polymerization of a monomer, such as a water-soluble vinyl polymer, a vinyl-based monomer which is a main structural unit of the water-soluble vinyl-based polymer, A nonionic water-soluble polymer having a photoreactive group can also be produced by copolymerizing with a photoreactive vinyl monomer.
- a photoreactive water-soluble vinyl polymer obtained by this method include poly ((meth) acrylamide-photoreactive (meth) acrylamide) copolymer and poly (daricidyl (meth) atalylate).
- One-photoreactive (meth) acrylic amide) copolymer (polyethylene glycol mono (meth) acrylate) one-photoreactive acrylamide copolymer, etc. ) Acrylate (photoreactive acrylamide) copolymers are preferred.
- the above-mentioned non-ionic water-soluble polymer preferably has a free carboxyl group in order to introduce a group capable of forming a covalent bond or a coordinate bond with a metal, as described later. Better.
- a free carboxyl group can be easily provided, for example, by further copolymerizing a vinyl monomer having a propyloxyl group such as methacrylic acid or acrylic acid.
- the number of moles of free carboxyl groups is preferably about 5% to 50% based on the total number of moles of all units constituting the water-soluble polymer.
- the water-soluble polymer used in the present invention has a group capable of covalently bonding or coordinating with a metal.
- gold used in QCM and SPR is important as metal.
- the group that can be covalently bonded to gold include a thiol group. It is known that a thiol group is covalently bonded to gold. For example, Japan Nanonet Bulletin No. 58 (March 16, 2004) [described here!
- a thiol group for example, the thiol group of a compound such as a 2-mercaptoethylamine having both an amino group and a thiol group in one molecule is protected. Then, the amino group and the above-mentioned free carboxyl group in the water-soluble polymer may be bonded with a cross-linking agent such as carbodiimide, and then the thiol group may be deprotected.
- a cross-linking agent such as carbodiimide
- the thiol group can be protected by, for example, converting a compound such as 2-mercaptoethylamine having an amino group and a thiol group in one molecule into a disulfide dimer. Deprotection, on the other hand, leads to disulfide dimers, It can be carried out by reacting a reducing agent such as ositol, which cleaves a disulfide bond, to cleave the disulfide bond to generate a free thiol group.
- a method for introducing a thiol group by such a method is specifically described in Examples below. The method of introducing a thiol group is not limited to the above method.
- the number of moles of the thiol group is preferably from 0.1 to: LOO mole, particularly preferably about 1 to 50 mole per one molecule of the water-soluble polymer.
- the thiol group in the water-soluble polymer binds to gold only by bringing the solution of the water-soluble polymer into contact with gold at room temperature.
- examples of the group capable of coordinating with gold include a carboxyl group and an amino group.
- the carboxyl group the free carboxyl group contained in the water-soluble polymer described above can be used as it is.
- the amino group can be easily introduced by bonding the free carboxyl group to the diamine conjugate using a cross-linking agent such as carbodiimide.
- the present invention relates to a bipolar or non-ionic water-soluble polymer having at least two photoreactive groups in one molecule and a metal or a covalent bond or a metal.
- a substance-immobilizing agent for immobilizing a substance on a metal comprising: a low-molecular compound having a group capable of coordinate bonding.
- the water-soluble polymer having at least two photoreactive groups in one molecule is as described above (however, it is necessary to introduce at least two photoreactive groups in one molecule). And it is not necessary to introduce a group capable of forming a covalent bond or a coordination bond with a metal, so that the above-mentioned free carboxyl group is not included).
- the low-molecular weight compound having a group capable of forming a covalent bond or a coordinate bond with a metal is preferably the thiol described above. It is a low molecular compound having a group, a carboxyl group or an amino group, and is not particularly limited as long as it has these groups. Preferred examples include alkylthiols such as octadecanethiol, mercaptoalkyl alcohols such as mercaptoethanol, alkylamines and alkylcarboxylic acids (the alkyl group in these compounds preferably has 2 carbon atoms). ⁇ 20).
- the term "low molecular weight compound” means a compound having a molecular weight of 1,000 or less, and preferably has a molecular weight of about 50 to 500.
- the mixing ratio of the water-soluble polymer and the low-molecular compound is not particularly limited, but is preferably 1 to 50, more preferably a molar ratio of the low-molecular compound to 100 of the water-soluble polymer. It is about 5 to 50.
- the present invention also provides an amphoteric or nonionic water-soluble polymer, a photocrosslinking agent having at least two photoreactive groups in one molecule, and a covalent bond or a coordinate bond with a metal. Also provided is a substance immobilizing agent for immobilizing a substance on a metal, comprising a low molecular compound having a possible group.
- amphoteric or non-ionic water-soluble polymer is the same as the above-mentioned water-soluble polymer (however, it is necessary to introduce at least two photoreactive groups in one molecule, and Since it is not necessary to introduce a group capable of forming a covalent bond or a coordination bond with a metal, the above-mentioned free carboxyl group is not contained, and since the photoreactive group is not required, the water-soluble polymer power is also reduced. -With the N group removed or without the unit [II]
- the “low-molecular compound having a group capable of covalent or coordinating with a metal” is as described above.
- photoreactive group of the photocrosslinking agent include an azide group (-N).
- a diazide conjugate having two azide groups is preferable, and a water-soluble diazido conjugate is particularly preferable.
- a photocrosslinking agent represented by the following general formula [III] is used in the substance immobilizing agent according to the first aspect of the present invention.
- R represents a single bond or an arbitrary group.
- -R- is not particularly limited, since it has a structure only connecting two phenylazide groups.
- Preferred examples of -R- include a single bond (that is, two ferrazide groups are directly connected) and an alkylene group having 1 to 6 carbon atoms (including one or two carbon-carbon unsaturated bonds. One or two carbon atoms may be double-bonded to oxygen to form a carboxy group,) (particularly preferably a methylene group), -0-, -SO-, -SS-, -S-,-R 2 JJ_LY R 3- (However, Nini has a single or double bond.
- Y represents a cycloalkylene group having 3 to 8 carbon atoms
- R 2 and R 3 each independently represent an alkylene group having 1 to 6 carbon atoms (which may contain one or two carbon-carbon unsaturated bonds, The bond between the carbon atom at the base end of the alkylene group and Y may be a double bond), and one or two carbon atoms are double-bonded to oxygen to form a carboxy group, ),
- the cycloalkylene group may be substituted with one or more optional substituents (if substituted, preferably the carbon atom constituting the cycloalkylene group) , One or two of which is double-bonded to oxygen to form a carbonyl group, and is substituted by Z or 1 or 2 alkyl groups having 1 to 6 carbon atoms.
- each benzene ring in the general formula [III] has one or more optional substituents (preferably Properly halogen, an alkoxyl group having 1 to 4 carbon atoms, may be substituted with a sulfonic acid or a hydrophilic group of the salt).
- substituents preferably Properly halogen, an alkoxyl group having 1 to 4 carbon atoms, may be substituted with a sulfonic acid or a hydrophilic group of the salt.
- preferable diazido conjugates include the above-described diazido conjugates, which are preferably used as a photocrosslinking agent in the substance fixing agent according to the first aspect of the present invention. Can be exemplified.
- Water-soluble for an optical cross-linking agent means that an aqueous solution having a concentration of 0.5 mM or more, preferably 2 mM or more can be administered.
- the mixing ratio of the water-soluble polymer, low-molecular compound and crosslinking agent is not particularly limited.
- the low-molecular compound is present in a molar ratio of 1 to 50, more preferably 100 to water-soluble polymer 100.
- the molar ratio of the crosslinking agent is about 1 to 50, and more preferably about 1 to 30.
- the substrate on which the substance is immobilized using the substance immobilizing agent of the present invention has a metal surface and is used for QCM measurement or SPR measurement. Preferable! / ⁇ Can be mentioned as an example.
- the immobilization of a desired substance on a substrate using the substance immobilizing agent of the present invention can be performed as follows. First, an aqueous solution or an aqueous suspension containing the substance to be fixed on the substrate and the substance fixing agent of the present invention is applied to the substrate.
- the concentration (by weight) of the water-soluble polymer in the aqueous solution is not particularly limited, but is usually about 0.005% to 10%. And preferably about 0.04 to 1%.
- the concentration of the substance to be immobilized (on a weight basis) is usually about 10 to 200 times, preferably about 20 to 100 times, the amount of the water-soluble polymer used.
- the group capable of covalently bonding or coordinating with the metal binds to the substrate, whereby the water-soluble polymer (the polymer is capable of covalently bonding or coordinating with the metal) Or the above-mentioned low molecular compound is bonded to the substrate.
- the substance-immobilizing agent contains the above low-molecular compound
- the low-molecular compound is first allowed to act on the substrate to bind to the substrate, and then the aqueous solution or the aqueous suspension containing the substance to be immobilized and the water-soluble polymer is used.
- a liquid or an aqueous solution or suspension containing a substance to be fixed, a water-soluble polymer, and a crosslinking agent is applied to the substrate.
- the applied liquid is preferably dried, and then irradiated with light.
- the light is light by which the photoreactive group used can generate a radical.
- an azide group is used as the photoreactive group, ultraviolet light is preferable.
- the dose of the irradiated light beam is not particularly limited, but is usually about lmW to 100 mW per 1 cm 2 .
- Irradiation with light generates a photoreactive substrate S radical.
- the water-soluble polymer has both a group capable of forming a covalent bond or a coordination bond with a metal and a photoreactive group
- the substance to be immobilized on the photoreactive group of the water-soluble polymer bound to the substrate are covalently bonded, whereby the substance to be fixed is bonded to the substrate via the water-soluble polymer.
- the water-soluble polymer has at least two photoreactive groups in one molecule and a low molecular weight compound having a group capable of covalently bonding or coordinating with a metal is used in combination, it is bonded to the substrate.
- the water-soluble polymer is covalently bonded to the low-molecular compound, and the substance to be immobilized is covalently bonded to the water-soluble polymer.
- the water-soluble polymer does not contain a photoreactive group and a low-molecular compound having a group capable of covalent or coordinating with a metal and a photocrosslinking agent are used in combination, the low-molecular compound bonded to the substrate is used.
- the water-soluble polymer is covalently bonded to the polymer via a photocrosslinking agent, and the substance to be fixed is covalently bonded to the water-soluble polymer. Therefore, in any case, the substance to be fixed is fixed to the base.
- the azido group used as a photoreactive group is irradiated with light so that a nitrogen molecule is released and a nitrogen radical is generated. Since it is possible to bond not only to a functional group such as a group but also to a carbon atom constituting an organic compound, it is possible to fix most organic substances.
- a binding reaction is carried out by using a radical generated by a photoreactive group, it binds to a random site rather than to a specific site of a substance to be immobilized. Therefore, it is considered that some molecules may lose their activity due to binding of the active site, but some molecules may bind at a site that does not affect the active site. For example, even if a substance has been conventionally difficult to be fixed by a covalent bond due to the presence of an appropriate substituent at or near the active site, the covalent bond does not cause loss of activity as a whole. It can be fixed to the substrate.
- the substance to be fixed Since the photoreactive group does not bind to the substance to be fixed in the vibrating part where the light is not irradiated, the substance to be fixed is removed by washing. Therefore, by performing selective exposure through a photomask or the like, a substance can be fixed in an arbitrary pattern. Therefore, the substance can be fixed in any of various shapes such as a microarray by selective exposure, which is very advantageous.
- a mixture of the substance-immobilizing agent of the present invention and the substance to be immobilized may be microspotted on a substrate, and the entire surface of the substrate may be irradiated with light.
- Microspotting is a method of applying a liquid to a very narrow area on a substrate, and is commonly used for the production of DNA chips and the like.Equipment for this is also commercially available. be able to.
- the substance-immobilizing agent of the present invention may be coated on the entire surface of the substrate, microspotted with the substance to be immobilized thereon, and then the entire surface of the substrate may be irradiated with light.
- a spot of the substance to be immobilized is formed on the layer of the substance immobilizing agent, and the proportion of the substance immobilized by covalent bonding to the substrate via the substance immobilizing agent increases.
- the substance fixing agent of the present invention is microspotted on the substrate, the substance to be fixed is microspotted thereon, and then the entire surface of the substrate is irradiated with light. Also in this case, spots of the substance to be immobilized are formed on the layer of the substance fixing agent (separated spots), and the ratio of the substance immobilized on the substrate via the substance fixing agent is high. Become.
- the method of the present invention provides a method for immobilizing an antibody, an antigen-binding fragment thereof, or an antigen. It can be suitably used for the preparation of assay plates and for the preparation of nucleic acid chips and microarrays in which DNA or RNA is immobilized on a QCM or SPR substrate, but is not limited thereto.
- the present invention can also be applied to fixing the components.
- Methacryloyloxetyl phosphorylcholine (In the general formula [ ⁇ ], R 1 is -CH-
- the MPC-methacrylic acid copolymer or MPC-butyl methacrylate copolymer produced as described above or a commercially available polyethylene glycol (average molecular weight: 1000) was used as the water-soluble polymer. Each water-soluble polymer was dissolved in water and adjusted to a concentration of 0.5% by weight.
- Sodium 4,4'-diazidostilbene-2,2'-disulfonate (commercially available) was used as a photocrosslinking agent.
- the water-soluble polymer prepared in 1 (2) and the optical crosslinking agent were mixed such that the concentration of the photocrosslinking agent was 0.25 mM.
- the obtained mixture (1 mL) was mixed with A antigen-positive panel blood cells (1 mL).
- the resulting blood cell suspension was spotted on a polystyrene dish in 0.5 L portions. After drying, the panel blood cells were fixed by UV irradiation (wavelength 260 nm, irradiation amount 40 mW / cm 2 , 10 seconds) (the water-soluble polymer was also fixed).
- the measured luminescence intensity is shown in Table 1 below.
- polyethylene glycol having an average molecular weight of 1000 (PEG1000) (a commercial product), polyethylene glycol having an average molecular weight of 10,000 (PEG10000) (a commercial product), or the MPC-butyl methacrylate copolymer prepared in Example 1 is used.
- PEG1000 polyethylene glycol having an average molecular weight of 1000
- PEG10000 polyethylene glycol having an average molecular weight of 10,000
- MPC-butyl methacrylate copolymer prepared in Example 1 is used.
- Each water-soluble polymer was dissolved in water to a concentration of 0.125% by weight.
- Each of the obtained aqueous solutions of the water-soluble polymers was mixed with a photocrosslinking agent (sodium 4,4′-diazidostilbene-2,2) (the final concentration of the optical crosslinking agent was 0.125 mM).
- the plate After washing with PBS (0.1% Tween20 (registered trademark)), the plate was reacted with a Sgia allergen antibody (commercially available) at room temperature for 3 hours. After washing with PBS (0.1% T wee n20 (registered trademark)), HRP-labeled secondary antibody ( ⁇ ) At room temperature for 1 hour. After washing with PBS (0.1% T wee n20 (TM)), was added chemiluminescent reagent, and the emission intensity was measured. For comparison, the same operation as above was performed using a mite allergen antibody (commercially available) in place of the Sgia allergen antibody.
- a mite allergen antibody commercially available
- Photoreactive polyethylene glycol is obtained by combining lOOmg of poly (ethylene glycol) bis (3-aminopropyl) terminal (sold by Aldrich, average molecular weight 1500) and 68.6mg of N- (4-azidobenzyloxy) succinimide. It is obtained by dissolving in 10 ml of formamide, stirring at 4 ° C for 24 hours at pH 6 and reacting.
- PMAc is a random copolymer of 2-methacryloyloxetyl phosphorylcholine (90%) and methacrylic acid (10%)
- WSC water-soluble carbodiimide
- Example 3 The same operation as in Example 1 was performed, except that a polystyrene substrate having an average surface roughness of 0.2 ⁇ m or 0.4 ⁇ m or an acrylic substrate having an average surface roughness of 2.5 m to 20 m was used as the substrate (
- the water-soluble polymer used was polyethylene glycol).
- FIG. 1 shows the results. As shown in Fig. 1, when the average surface roughness of the substrate was 15 m, the emission intensity was clearly higher than that of the substrates with other surface roughness.
- water-soluble polymer in addition to the above-mentioned polymer of polyethylene glycol metathallate, polyethylene glycol having an average molecular weight of 1000 (PEG1000) (commercially available), polyethylene glycol having an average molecular weight of 1000 (PEG10000) (commercially available) or Examples
- PEG1000 polyethylene glycol having an average molecular weight of 1000
- PEG10000 polyethylene glycol having an average molecular weight of 1000
- MPC-butyl methacrylate copolymer prepared in 1 was used.
- Each water-soluble polymer was dissolved in water to a concentration of 0.125% by weight.
- Each of the obtained aqueous polymer solutions was mixed with a photocrosslinking agent (sodium 4,4'-diazidostilbene-2,2'-disulfonate). weight%).
- a photocrosslinking agent sodium 4,4'-diazidostilbene-2,2'-disulfonate. weight%.
- Each of the aqueous solutions of the obtained water-soluble polymers was mixed 1: 1 with an aqueous solution of mite allergen (commercially available) (0.25% by weight). The resulting mixture was spotted on a polystyrene dish in 50 nL increments. After drying, mite allergen was immobilized by UV irradiation (wavelength 290 to 390 nm, illuminance 17 mW / cm 2 , 10 seconds) (the water-soluble polymer was also immobilized).
- a methacryloyloxetyl phosphorylcholine (MPC) polymer was synthesized by a conventional method.
- the mixing ratio of 2-methacryloyloxetyl phosphorylcholine and methacrylic acid was 9: 1 (hereinafter, “MPC 9: 1”), 7: 3 (hereinafter, “MPC 9: 1”) in molar ratio (ratio of n and m in the following formula).
- MPC7: 3”) and 5: 5 hereinafter, “MPC5: 5” were synthesized.
- the synthesized polymer is a random copolymer.
- the average molecular weights of the synthesized MPC polymers were 215,000 for MPC9: 1, 550000 for MPC7: 3, and 1104000 for MPC5: 5. [0135] [Formula 18]
- 2-mercaptoethylamine dimer was produced by the basis (20 ° C, 48 hours).
- the product was 3-carboxyl cccll produced by the Ellman reaction of 5-5 'dithiobis 2-nitrobenzene.
- MPC polymer As for the azide group introduced into one molecule, MPC9: 1 was 1 lmol, MPC7: 3 was 29.4 mol, and MPC5: 5 was 99.5 mol.
- the thiol group and azide group-containing MPC9: 1, MPC7: 3, and MPC5: 5 prepared in Example 5 were fixed to the gold sensor chip electrode portion of the crystal resonator microbalance measurement device by the following method. . First, a piranha solution (hydrogen peroxide solution: concentrated sulfuric acid 1: 3) was placed on the electrode portion of the sensor chip, allowed to stand for 5 minutes, washed with water, and then blown with air to remove water. This operation was repeated. The sensor chip was set on the quartz crystal microbalance measurement device as shown in Fig. 2, and immersed in water until the baseline stabilized. In FIG. 2, reference numeral 1 denotes a sensor chip, and reference numeral 2 denotes pure water.
- MPC7: 3 prepared in Example 1 and a commercial mite allergen antibody were mixed in a buffer at a weight ratio of 0.5: 1, and the resulting aqueous solution (MPC7: 3 polymer concentration 0.125% by weight) was placed on a sensor chip. 1 ⁇ L was spotted. After drying, it was fixed by ultraviolet irradiation (10 seconds, dose: 40 mWZcm 2 ). The sensor chip was set in 2 ml of PBS (1% BSA). After the baseline was stabilized, 10 L of mite allergen (100 g / ml), which had been previously concentrated, was added dropwise. The frequency change was measured over time by QCM. On the other hand, a control containing no mite allergen antibody was similarly fixed on a sensor chip and measured.
- FIG. 4 shows the results. After dropping the mite allergen, the MPC polymer alone showed almost no change in frequency, whereas the frequency of the sensor chip with the mite allergen antibody fixed changed by about 500 Hz. This frequency change is due to the change in the weight of the sensor surface due to the antigen-antibody reaction, demonstrating that the mite allergen antibody immobilized with the MPC polymer can recognize the allergen. As a result, it became clear that allergens can be detected by QCM using the substance immobilizing agent of the present invention.
- Sodium 4,4'-diazidostilbene-2,2'-disulfonate (commercially available) was used as a photocrosslinking agent.
- the photo-crosslinking agent was mixed such that the concentration of the photo-crosslinking agent was 0.003125%, the concentration of the water-soluble polymer was 0.0625%, and the concentration of BSA (manufactured by Aldrich) was 0.125%.
- the resulting aqueous solution was treated with a Biacore SPR gold substrate for 20 minutes with mercaptoethanol, and then 20 ⁇ L was applied onto a 7 ⁇ 7 mm 2 area and dried (film thickness: about 0.2 ⁇ m). Next, BSA was fixed by UV irradiation (black light for 7 minutes).
- the SPR sensitivity (RU) was 300.
- the QCM frequency change (Hz) was 1000.
Abstract
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JP2008286776A (ja) * | 2007-01-31 | 2008-11-27 | Fujifilm Corp | 生理活性物質を固定化した基板の製造方法 |
JP2008209114A (ja) * | 2007-02-23 | 2008-09-11 | Jsr Corp | プローブ結合粒子およびその製造方法ならびにブロッキング剤 |
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JP7130919B2 (ja) | 2016-03-11 | 2022-09-06 | 三菱瓦斯化学株式会社 | 生体物質固定化方法 |
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WO2022203032A1 (ja) | 2021-03-26 | 2022-09-29 | 国立研究開発法人理化学研究所 | 物質固定化用の基体、及びその利用 |
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