WO2004088319A1 - 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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- WO2004088319A1 WO2004088319A1 PCT/JP2004/004510 JP2004004510W WO2004088319A1 WO 2004088319 A1 WO2004088319 A1 WO 2004088319A1 JP 2004004510 W JP2004004510 W JP 2004004510W WO 2004088319 A1 WO2004088319 A1 WO 2004088319A1
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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
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- the present invention relates to a substance immobilizing agent, a method for immobilizing a substance using the same, and a substrate for immobilizing a substance using the same.
- the present invention relates to a substance immobilizing agent for immobilizing a desired substance such as a polypeptide, a nucleic acid, and a lipid on a substrate, a substance immobilizing method using the same, and a substance immobilizing base using the same.
- immunoplates for immunoassay in which antibodies or antigens are immobilized on plates
- DNA chips in which nucleic acids are immobilized on chips
- physical adsorption has been widely used as one of the methods for immobilizing proteins and nucleic acids on a substrate. That is, a protein or nucleic acid is immobilized on a substrate by physical adsorption by leaving a hydrophobic substrate such as polystyrene and an aqueous solution of a protein or nucleic acid to be immobilized on the substrate in contact with each other and leaving the solution to stand.
- the method using physical adsorption has a problem that the bond between the substrate and the immobilized substance is weak, and the stability of the substrate on which the substance is immobilized is insufficient.
- ⁇ proteins such as serum albumin (BSA), casein, skim milk (when immobilizing proteins), salmon sperm, etc. Blocking with DNA such as DNA (when immobilizing DNA) is performed, but the effect of blocking to prevent non-specific adsorption is not always satisfactory.
- 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.
- immobilization cannot be performed by this method.
- non-specific adsorption is prevented by blocking, but the prevention effect is not always satisfactory.
- an object of the present invention is to provide a substance immobilizing agent which can immobilize various substances to be immobilized on a substrate by covalent bonds, and which has an excellent effect of preventing non-specific adsorption, and a substance using the same.
- An immobilization method and a substance-immobilized substrate using the same can be provided.
- the present inventors have conducted intensive studies and found that nonspecific adsorption can be effectively prevented by using a water-soluble polymer that is electrically neutral as a whole molecule as a substance immobilizing agent.
- the present invention has been completed.
- the present invention relates to a water-soluble polymer used for immobilizing a desired substance on a substrate, wherein the water-soluble polymer has at least two photoreactive groups in one molecule, and Provides a substance immobilizing agent comprising an electrically neutral polymer as a whole molecule.
- the present invention provides a substance on a substrate, which comprises applying an aqueous solution or a suspension containing the substance to be immobilized on the substrate and the substance-fixing agent of the present invention to the substrate, and irradiating the substrate with light. To provide a method for immobilization. Further, the present invention provides a substrate on which the substance is immobilized by the method of the present invention.
- a substance to be immobilized on a substrate can be immobilized by a covalent bond, and a substance immobilizing agent excellent in the effect of preventing non-specific adsorption, and substance immobilization using the same And a substance-immobilized substrate using the same.
- a substance to be immobilized can be immobilized by a covalent bond regardless of its type, and a stable immobilized substrate can be obtained.
- 4004510 using the substance fixing agent of the present invention, 4004510
- Immobilization of the quality effectively prevents non-specific adsorption. Furthermore, when the substance is immobilized using the substance immobilizing agent of the present invention, the patterning of the immobilized substance is possible by performing selective exposure, so that the substance can be easily immobilized in an arbitrary pattern such as a microarray. can do.
- the substance immobilizing agent of the present invention has at least two photoreactive groups in one molecule, and is composed of an electrically neutral polymer as a whole of the premolecule.
- electrically neutral as a whole molecule means that the compound does not have a group that becomes an ion when ionized in an aqueous solution having a pH around neutrality (pH 6 to 8), or even if it does, it is positive. It has an ion and an anion, meaning that the sum of the charges is substantially zero.
- substantially means that the sum of the electric charges becomes zero, or even if it does not become zero, it is so small that the effect of the present invention is not adversely affected.
- the substance immobilizing agent of the present invention is water-soluble, and the solubility in water (the number of grams dissolved in 100 g of water) is preferably 5 or more.
- Preferred examples of the water-soluble polymer include a polymer having a unit having a structure represented by the following general formula [I] and a polymer having a unit having a structure represented by the following general formula [II].
- 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 formulas [I] and [II] are each two or more, and the number of the units represented by the general formula [I] is the same as that of the unit represented by the general formula [II]. It is bigger than the number).
- unit [ ⁇ ] The unit having the structure represented by the above general formula [I] is hereinafter referred to as “unit [ ⁇ ] for convenience. Sometimes. Further, the unit having the structure represented by the general formula [II] may be referred to as “unit [11]” hereinafter for convenience. )
- 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 vinyl 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 a vinyl moiety is in an addition polymerization
- R 1 is a single bond or Represents an alkylene group having 1 to 10 carbon atoms (however, it may be substituted with one or two hydroxyl groups)
- Preferred specific examples of such a unit include 2-methacryloyloxetylphosphorylcholine, 2-acryloyloxetylphosphorylcholine, N- (2-methacrylamide) ethylphosphorylcholine, 4-methacryloyloxybutyl Derived from phosphorylcholine, 6-methacryloyloxyhexylphosphorylcholine, 10-methacryloyloxydecylsylphosphorylcholine, ⁇ -methacryloyldioxyethylenephosphorylcholine or 4-styryloxybutylphosphorylcholine (that is, these units were polymerized). ) Units can be mentioned. Among these, a unit derived from 2-methacryloyloxetyl phosphorylcholine is particularly preferred. 2004/004510
- preferred examples of the photoreactive group in the unit [II] include, but are not limited to, an azide group (-M 3 ). Further, as Y in the general formula [II], a vinyl monomer residue is preferable. Preferred examples of the unit [II] include the following general formula [V
- Y ′ represents a methacryloxy group, a methacrylamide group, an acryloxy group, an acrylamide group, a styryloxy group or a styrylamide group in a state where the vinyl moiety is addition-polymerized
- R 2 represents a single bond
- An alkylene group having 1 to 10 carbon atoms which may be substituted with one or two hydroxyl groups
- a phenylene group (however, substituted with an alkyl group having 1 to 3 carbon atoms or a hydroxyl group) It may be.)
- the number of units [I] is larger than the number of units [II], and the ratio is not particularly limited, but is preferably about 100: 2 to 100: 50, particularly preferably about 100: 5 to 100: 20. .
- the polymer is mainly composed of the unit [I] having a phosphorylcholine group, and thus non-specific adsorption is effectively prevented.
- the molecular weight of the water-soluble polymer is not particularly limited, but is usually about 1,000 to 1,000,000, preferably about 5,000 to 100,000.
- the above-mentioned water-soluble polymer is preferably composed only of the unit [I] and the unit [11], but may contain a unit derived from another polymerizable monomer as long as the effect of the present invention is not adversely affected.
- the proportion of such other units is not particularly limited as long as it does not adversely affect the effects of the present invention.
- the proportion is usually 30 mol% or less, preferably 10 mol% or less of all units in the polymer. Mol% or less.
- water-soluble polymer examples include those represented by the following general formula [11]. 0
- n and m are each independently an integer of 2 or more, and n is larger than m, and X ' The unit containing and the unit containing Y 'are connected in random order.
- n ' is an integer of 50 to 200
- m' is an integer of 5 to 40
- the units having a phosphorylcholine and the units having an azidophenyl group are bonded in a random order.
- 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.
- a unit having a phorphorylcholine group-containing group [and a 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 monomers and the bonding of the side chains can be easily carried out according to the common general technical knowledge of those skilled in the art, and examples thereof are specifically described in the following Examples. 2004/004510
- a nonionic water-soluble polymer having at least two photoreactive groups in one molecule can be given.
- the nonionic water-soluble polymer has the same nonspecific adsorption-preventing effect as the phosphorylcholine-containing polymer described above, and has the advantage that it can be produced or obtained at a lower cost than the phosphorylcholine-containing polymer.
- nonionic means that there is substantially no group that becomes ionized by ionization in an aqueous solution at a pH around neutrality (pH 6 to 8). Means that such a group is not contained at all, or is contained in a very small amount so as not to adversely affect the effect of the present invention (for example, the number of such groups is 1% or less of carbon number). Means that.
- the molecular weight of the nonionic water-soluble polymer is not particularly limited, but is usually about 350 to 500,000, preferably about 500 to several hundred thousand.
- nonionic water-soluble polymers include polyalkylene glycols such as polyethylene glycol (PEG) and polypropylene glycol; vinyl alcohol, methyl vinyl ether, vinylpyrrolidone, vinyloxazolidone, and vinylmethyloxa.
- PEG polyethylene glycol
- Ppropylene glycol vinyl alcohol, methyl vinyl ether, vinylpyrrolidone, vinyloxazolidone, and vinylmethyloxa.
- polyethylene glycol particularly preferred are polyethylene glycol, poly (meth) acrylamide (in the present specification and claims, “(meth) acryl” means “methacryl” or “acryl”) and poly (meth) acryl. (Glycidyl (meth) acrylate), of which polyethylene glycol is particularly preferred.
- the nonionic water-soluble polymer described above has at least two photoreactive groups per molecule.
- the number of photoreactive groups per nonionic water-soluble polymer is not particularly limited as long as it is 2 or more, but if it is too large, nonspecific adsorption may increase.
- the number of carbon atoms (not including side chain carbon atoms) constituting the polymer is preferably 1 ⁇ / ⁇ or less, more preferably 5 ⁇ 1 ⁇ 2 or less.
- Preferred examples of the photoreactive group include, but are not limited to, an azide group (-N 3 ).
- Specific examples of the photoreactive group include a phenylazide group, an acetyl group, and a benzoyl group, and a phenylazide group is particularly preferred.
- a photoreactive group such as an azide group may be directly bonded to a nonionic water-soluble polymer, or may be bonded to a nonionic water-soluble polymer via an arbitrary spacer structure. Often, the latter is preferred because it is easier to manufacture. In the latter case, the spacer structure is not limited at all, and may be, for example, an alkylene group having 1 to 10 carbon atoms (however, it may be substituted with one or two hydroxy groups), phenylene Groups (but may be substituted with 1 to 3 alkyl groups having 1 to 4 carbon atoms or a hydroxyl group).
- the introduction of the photoreactive group into the nonionic 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 nonionic water-soluble polymer.
- an azide compound having a functional group that reacts with the functional group to bond the azide group to the nonionic water-soluble polymer.
- polyethylene glycol which is a preferred nonionic water-soluble polymer
- polyethylene glycol having amino groups ⁇ carboxyl groups at both ends is commercially available.
- An azide group can be bonded to polyethylene glycol by reacting an azide group-containing compound. The following examples also specifically describe a plurality of such methods.
- the nonionic water-soluble polymer is formed by polymerization of monomers, such as a water-soluble vinyl polymer, a vinyl monomer which is a main structural unit of the water-soluble vinyl polymer is used.
- a nonionic water-soluble polymer having a photoreactive group can also be produced by copolymerizing the polymer with a photoreactive vinyl monomer.
- Preferred examples of the photoreactive water-soluble vinyl polymer obtained by this method include poly ((meth) acrylamide photoreactive (meth) acrylamide) copolymer and poly (glycidyl (meth) acrylic ester).
- Photoreactive (meth) acrylic acid amide) copolymer poly (ethylene glycol mono (meth) acrylate-photoreactive acrylic acid amide) copolymer, and the like. This is specifically described in the following examples.
- 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 its components (including organelles such as nuclei and mitochondria, and membranes such as cell membranes and unit membranes).
- the azide group used as a photoreactive group in the substance immobilizing agent of the present invention when irradiated with light, releases nitrogen molecules and generates nitrogen radicals.
- the nitrogen radicals are functional groups such as amino groups and carboxyl groups. Since it is possible to bond not only to a group but also to a carbon atom constituting an organic compound, almost all organic substances can be immobilized.
- the substrate at least the surface is made of a substance that can bind to the photoreactive group.
- the material is not particularly limited as long as it is formed, and examples thereof include materials made of organic materials such as polyethylene terephthalate, polycarbonate, and polypropylene, in addition to polystyrene widely used in microplates and the like.
- a glass plate coated with a silane coupling agent can also be used.
- the shape of the substrate is not limited at all, and a plate-like substrate such as a substrate for a microarray, a bead-like substrate, a fibrous substrate, or the like can be used. Further, holes and grooves provided in the plate, for example, microwells of a microplate can also be used.
- the substance-immobilizing agent of the present invention is particularly suitable for microarrays.
- 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 aqueous suspension containing the substance to be immobilized on the substrate and the substance fixing agent of the present invention is applied to the substrate.
- the concentration (by weight) of the substance immobilizing agent in the aqueous solution is not particularly limited, but is usually about 0.005% to 10%, preferably about 0.04 to 1%.
- the concentration (by weight) of the substance to be immobilized is usually about 10 to 200 times, preferably about 20 to 100 times the amount of the substance immobilizing agent used.
- the applied liquid is preferably dried and then irradiated with light.
- Light is light by which the photoreactive group used can generate radicals.
- 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 1 mW to 100 mW per 1 cm 2 .
- the photoreactive groups in the polymer Upon irradiation with light, the photoreactive groups in the polymer generate radicals and the polymer 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 polymer.
- 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. Most organic substances can be immobilized because they can also bond to the carbon atoms that make up the substance.
- the binding is performed not at a specific site of the substance to be immobilized but at a random site. Therefore, the active site is available for binding. Although it is considered that some molecules may lose their activity due to the occurrence of such a molecule, some molecules may bind at a site that does not affect the active site. Can be immobilized on a substrate by covalent bonding without losing activity as a whole, even if it is difficult to immobilize by covalent bonding because of the presence of or near the active site .
- Washing removes both the polymer and the substance since the photoreactive groups do not bind to the substrate and the substance in the areas not irradiated with light. Therefore, by performing selective exposure through a photomask or the like, a substance can be immobilized in an arbitrary pattern. Therefore, the substance can be immobilized 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 in the production of DNA chips and the like.Equipment for this is also commercially available. It can be done easily.
- the substance-immobilizing agent of the present invention may be coated on the entire surface of the substrate, microspotted on the substance to be immobilized thereon, and then the entire surface of the substrate may be irradiated with light.
- spots of the substance to be immobilized are formed on the layer of the substance immobilizing agent, and the percentage of the substance immobilized by covalent bonding to the substrate via the substance immobilizing agent increases.
- the substance-immobilizing agent of the present invention may be microspotted on a substrate, the substance to be immobilized may be microspotted thereon, and then the entire surface of the substrate may be irradiated with light.
- spots of the substance to be immobilized are formed on the layer of the substance immobilizing agent (separate spots), and the percentage of the substance immobilized covalently to the substrate via the substance immobilizing agent is increased. Get higher.
- the method of the present invention can be suitably used for preparing an immunoassay plate on which an antibody or an antigen-binding fragment thereof or an antigen is immobilized, a nucleic acid chip or a microarray having DNA or RNA immobilized on a substrate.
- the present invention is not limited to these, and can be applied to, for example, immobilization of whole cells or components thereof.
- the present invention will be described more specifically based on examples.
- the present invention The present invention is not limited to the embodiment.
- PC photoreactive methacryloyloxetyl phosphorylcholine
- the non-specific adsorption of the photoreactive MPC polymer produced in Example 1 was investigated by contacting the photoreactive MPC polymer with a FITC-modified protein or cells as follows.
- the photoreactive MPG polymer produced in Example 1 was dissolved in pure water at a concentration of 10 mg / ml. Then, 25 I was coated on a polystyrene substrate (diameter 2 cm) and air-dried. Next, ultraviolet rays (wavelength 260 nm) were selectively irradiated through a photomask having a stripe pattern having a width of 10 Om (irradiation amount 16 mW / cm 2 ). Next, the substrate was washed with water, and a photoreactive MPG polymer was immobilized on a polystyrene substrate in a stripe shape.
- FITC-BSA (commercially available from Sigma) aqueous solution (concentration 10 mg / ml), FITG-lgG (commercially available from Sigma) aqueous solution (concentration 2 mg / ml) or TC-fibrinogen solution (concentration 3.7 mg / 370 ⁇ I ) was placed on the substrate on which the above pattern was formed at 50 I, and reacted at 37 ° C. for 10 minutes. After washing with PBS, it was dried and observed with a fluorescence microscope.
- the FG-fibrinogen used in the above test was prepared as follows. C That is, 0.1 mg of FG-1 was added to 2 mg of 2 mg of fibrinogen, and 50 mM sodium carbonate buffer (PH 8.5) was added. It was dissolved in 7 ml, reacted at 4 ° C overnight, and concentrated by centrifugation through a filter having an excluded molecular weight of 3000. Centrifuged three times with MilliQ water (trade name) for desalination. Then, it was freeze-dried to obtain 3.7 mg of FITG-fibrinogen.
- the photoreactive MPC polymer prepared in Example 1 was immobilized on a polystyrene substrate with a pattern as described above, washed with water, sterilized with 70% ethanol, and washed with sterile water. The obtained substrate is left as it is, or 1% BSA / PBS solution or 1% fibrinogen / PBS solution 250 I is placed on the substrate and reacted at 3 ° C for 10 minutes.After washing with water, cell adsorption test Was served.
- the cells used were Cos 7 cells (commercially available from RIKEN Cell Bank) and Raw 246 cells (commercially available from RIKEN Cell Bank). The cells were seeded on a substrate, and observed with a microscope after 1 hour and 4 hours.
- an immunoassay for detecting collagen was performed by the method described below.
- (V) Add 10 ⁇ l of anti-collagen antibody (commercially available from Monosan) (5 g / ml) or anti-human GD3 antibody (commercially available from Pharmingen) (5 ig / ml) on the spot as the next antibody, Incubate at room temperature for 4 hours.
- anti-collagen antibody commercially available from Monosan
- anti-human GD3 antibody commercially available from Pharmingen
- FITG-labeled secondary antibody (anti-rabbit IgG or mouse IgG antibody) (commercially available from Amersham) was added (diluted 5000-fold), 100, and incubated for 1 hour at room temperature.
- MPG polymer 0 After immunostaining with anti-collagen antibody, MPG polymer 0
- PEG-G00H poly (ethylene glycol) bis (carboxymethyl) ether
- 4 -Azido arin and 127 mg of water-soluble carpoimide were dissolved in 10 ml of pure water and stirred at pH 6 at 4 ° C for 24 hours.
- the pH was adjusted to 12 with sodium hydroxide, and unreacted substances were precipitated.
- the precipitate was sedimented by centrifugation, the supernatant was recovered, and desalted with a separatory funnel using a black hole form (repeated until the pH became neutral).
- the photoreactive PEG-C00H was obtained by freeze-drying (G00H group is consumed for binding to the azide compound and no longer exists, but for convenience, it is described in this manner. 4004510).
- the photoreactive polyacrylic acid was prepared as follows. Dissolve 720 mg of polyacrylic acid (commercially available from Wako Pure Chemical Industries, average molecular weight of 1,000,000), 170,6 mg of 4-azidoaniline and 1.917 g of water-soluble carbodiimide in 100 ml of pure water, and add p H7.0, stirred at 4 ° C for 24 hours. After the reaction was completed, dialysis was performed until the UV absorption of azido dilin from the external solution disappeared. Finally, it was freeze-dried to obtain a photoreactive polyacrylic acid polymer.
- a photoreactive polyacrylamine was produced in the same manner as in Comparative Example 1 except that polyacrylic acid was replaced by polyacrylamine.
- a substrate polystyrene dish on which collagen was immobilized using the substance immobilizing agent prepared in Example 3 to 6, or Example 1, Comparative Example 1 or Comparative Example 2, was prepared. Using this, immunoassay for anti-collagen antibody was performed.
- Photoreactive PEG-NH 2 (Example 3), photoreactive PEG-G00H (Example 4), and photoreactive poly (acrylamide N-azidophenylacrylic acid amide) Polymer (Example 5) or photoreactive poly (glycidyl methacrylate-N-azidophenylacrylamide) copolymer (Example 6) (0.125wt%) and collagen (0.25t%) Mixed with.
- V Anti-collagen antibody (commercially available from Monosan) 10-fold diluted solution (1% BSA / PBS) or mouse IgG antibody (commercially available from Santa cruz biotechnology) 40-fold diluted solution (1% BSA / PBS) as the next antibody Add 100 I as spots and incubate for 3 hours at room temperature.
- FITG-labeled secondary antibody pile rabbit IgG antibody or mouse IgG antibody (commercially available from Amersham) 20-fold diluted solution
- a photoreactive polyacrylic acid collagen spot having only a negative charge (Comparative Example 1) has no fluorescence
- a photoreactive polyallylamine collagen having only a positive charge (Comparative Example 2) has a different type of antibody.
- Nonspecific staining occurred regardless.
- the photoreactive polyethylene glycol can immobilize proteins as well as the MPG polymer and suppresses non-specific adsorption.
- a poly (acrylamide N-azidophenyl acrylate) copolymer (Example 5) and a poly (glycidyl methacrylate-1-azidophenyl acrylate) copolymer (Example 5) In 6), the amount of protein immobilized is lower than that of polyethylene glycol (Examples 3 and 4), but immobilization is possible and nonspecific adsorption can be suppressed.
- N-azidophenylacrylic acid amide 49.90 mg , PEG (Polymerization degree n 8) Dissolve 222.2 mg of monomethacrylate in 43 ml of ethyl acetate, add 6.31 mg of azobisisobutyronitrile (AI BN), fill with nitrogen, stopper tightly, and seal in a water bath at 60 ° C, stirred for 6 hours. After stopping the heating and evaporating the solvent to some extent, the mixture was transferred to getyl ether and sonicated for 30 minutes. The solid was recovered and dried under reduced pressure for 2 hours. As a result, a photoreactive poly (ethylene glycol monomethacrylate-N-azidophenylacrylamide) copolymer was obtained.
- Sugi and mite allergen (commercially available from Seikagaku Corporation) were adjusted to 0.25 wt% with pure water, and the photoreactive polymer (0.125 wt%) produced in Example 1 or Example 8 was mixed with 1 : 125 wt%. Mix at 1 (V / V). The mixed allergen polymer solution was spotted on a polystyrene substrate at 0.5 ⁇ I and air-dried. Next, the allergen was immobilized on the polystyrene substrate by irradiating ultraviolet rays (wavelength 260 nm, irradiation amount 15 mWZcm 2 ).
- the plate was washed with PBS (0.1% tween 20), and allergen antibody (commercially available from Seikagaku Corporation) adjusted to 100 g / ml with human serum as primary antibody was added to the spot at 10 I. Then, the mixture was reacted at room temperature for 2 hours. Next, the plate was washed with PBS (0.1% tween 20), and a HRP-labeled secondary antibody (available from Amersham Biosciences) diluted 100-fold with 10% BSA / PBS was added to the spot at 10 iI. The reaction was performed at room temperature for 1 hour.
- a chemiluminescent reagent EGL advance (commercially available from Amersham Bioscience) was added, and an image exposed for 30 seconds with a gel photographing device was obtained. The obtained image was digitized by an analysis software.
- PEG and the copolymer of Example 8 showed the highest emission intensity at an antibody concentration of 100 ng / ml. Also, the luminescence intensity when the antibody concentration was 0 was low with the copolymer of Example 8, and it was found that the non-specific adsorption was the least.
- the present invention provides a substance immobilizing agent which can immobilize a substance to be immobilized on a substrate by a covalent bond and has an excellent effect of preventing non-specific adsorption, and a substance immobilizing agent using the same.
- the present invention relates to a method and a substance-immobilized substrate using the same. According to the present invention, a substance to be immobilized can be immobilized by a covalent bond regardless of its type, and a stable immobilized substrate can be obtained. When a substance is immobilized using the substance immobilizing agent of the present invention, non-specific adsorption is effectively prevented.
- the present invention is useful for producing various microarrays and the like.
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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EP04724403A EP1615034A4 (en) | 2003-03-31 | 2004-03-30 | FIXING AGENT, METHOD FOR FIXING A SUBSTANCE THEREFOR AND SUBSTRATE WITH A SUBSTANCE FIXED THEREFOR |
JP2005504239A JP4630817B2 (ja) | 2003-03-31 | 2004-03-30 | 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 |
US10/551,408 US20060160089A1 (en) | 2003-03-31 | 2004-03-30 | Fixing agents, method of fixing substance with the same, and substrate having sustance fixed thereto with the same |
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JP2003093834 | 2003-03-31 | ||
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JP2006322708A (ja) * | 2005-05-17 | 2006-11-30 | Institute Of Physical & Chemical Research | 物質固定化方法 |
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Also Published As
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JPWO2004088319A1 (ja) | 2006-07-06 |
JP4630817B2 (ja) | 2011-02-09 |
EP1615034A1 (en) | 2006-01-11 |
EP1615034A4 (en) | 2010-11-24 |
US20060160089A1 (en) | 2006-07-20 |
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