WO2015129924A1 - Testing device, testing kit, transfer member, testing device fabrication method, and testing method - Google Patents
Testing device, testing kit, transfer member, testing device fabrication method, and testing method Download PDFInfo
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- WO2015129924A1 WO2015129924A1 PCT/JP2015/056579 JP2015056579W WO2015129924A1 WO 2015129924 A1 WO2015129924 A1 WO 2015129924A1 JP 2015056579 W JP2015056579 W JP 2015056579W WO 2015129924 A1 WO2015129924 A1 WO 2015129924A1
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- resin
- testing device
- reagent
- layer
- flow path
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Classifications
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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
- G01N33/54366—Apparatus specially adapted for solid-phase testing
- G01N33/54386—Analytical elements
- G01N33/54387—Immunochromatographic test strips
- G01N33/54388—Immunochromatographic test strips based on lateral flow
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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
- G01N33/558—Immunoassay; Biospecific binding assay; Materials therefor using diffusion or migration of antigen or antibody
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
- G01N33/543—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals
- G01N33/544—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals the carrier being organic
- G01N33/545—Synthetic resin
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2333/00—Assays involving biological materials from specific organisms or of a specific nature
- G01N2333/435—Assays involving biological materials from specific organisms or of a specific nature from animals; from humans
- G01N2333/575—Hormones
- G01N2333/59—Follicle-stimulating hormone [FSH]; Chorionic gonadotropins, e.g. HCG; Luteinising hormone [LH]; Thyroid-stimulating hormone [TSH]
Definitions
- the present invention relates to a testing device in which a flow path for flowing a sample is formed.
- testing devices in which a flow path for flowing a sample is formed have been used for the purposes of testing samples such as blood, DNA, foods, or beverages.
- a testing device including: a sample pad as a liquid receiving portion for receiving a test liquid; ' a conjugate pad in which the test liquid supplied from the sample pad undergoes a reaction! and a membrane film for flowing the test liquid supplied from the conjugate pad (see PTL l).
- the conjugate pad contains a labeled antibody obtained by labeling an antibody with a pigment or the like. When supplied with a test liquid from the sample pad, the conjugate pad lets any antigen contained in the test liquid react with the labeled antibody, and supplies them to the membrane film.
- an antibody (capture antibody) for capturing the antigen is previously applied over a detection portion of the membrane film.
- the antigen contained in the test liquid supplied from the conjugate pad is captured at the detection portion in the state of being conjugated with the labeled antibody.
- a color is developed at the detection portion, which makes it possible to measure the antigen contained in the test liquid qualitatively or quantitatively by visually observing or measuring the degree of the color development.
- PTL 1 discloses adjusting a water absorption speed of a synthetic fiber constituting the conjugate pad, to thereby increase a spreading speed of the test liquid and save the testing time.
- reagents such as a labeled antibody and a capture antibody, and reagents such as a labeling indicator and a detection indicator are provided as a solid phase over the fiber of a flow path member or the like. Therefore, when a material of the flow path member is selected arbitrarily in order to increase the spreading speed of a sample, there may occur problems that the flow path member has an excessively strong interaction with the reagents such as the labeled antibody and the labeling indicator and cannot diffuse the reagents, or that the flow path member has an excessively weak interaction with the reagents such as the capture antibody and the detection indicator and cannot fix the captured sample.
- a test line and a control line are formed by directly applying a liquid in which a capture antibody is dissolved over a flow path member made of a hydrophilic porous material. Therefore, the capture antibody is present in the hydrophilic porous material in a diffused state.
- colorant from labeling particles such as gold colloid particles that are bound with the capture antibody present in the hydrophilic porous material cannot be sensed actually, because light scattering occurs. That is, there has been a significant problem that much of the capture antibody is not utilized effectively.
- the testing device of the present invention it is possible to adjust the strength of interaction between the resin layer and the reagent, by selecting a resin depending on the reagent to be used. Therefore, even when the flow path member is selected arbitrarily depending on the purpose, it is easy to control release and fixing of the reagent.
- Fig. 1 is a top plan view of a testing device according to an embodiment of the present invention.
- Fig. 2 is a cross -sectional diagram of a testing device according to an embodiment of the present invention.
- Fig. 3 is a cross-sectional diagram of a testing device, showing a portion at which a flow path member and a resin layer face each other.
- Fig. 4A is a cross -sectional diagram of a testing device, showing a portion at which a flow path member and a resin layer face each other.
- Fig. 4B is a cross -sectional diagram of a testing device, showing a portion at which a flow path member and a resin layer face each other.
- Fig. 5A is a cross -sectional diagram of a testing device, showing a portion at which a flow path member and a resin layer face each other.
- Fig. 5B is a cross-sectional diagram of a testing device, showing a portion at which a flow path member and a resin layer face each other.
- Fig. 6 is a conceptual diagram of a conjugate pad of a conventional testing device.
- Fig. 7 is a conceptual diagram of a membrane of a conventional testing device.
- Fig. 8 is a cross-sectional diagram of a transfer member according to an embodiment of the present invention.
- Fig. 9 is a conceptual diagram of a testing kit according to an embodiment of the present invention.
- Fig. 10A is an exemplary diagram of a testing device of Example.
- Fig. 10B is an exemplary diagram of a testing device of Example.
- Fig. 11A is an exemplary diagram of a testing device of
- Fig. 11B is an exemplary diagram of a testing device of
- Fig. 12A is an exemplary diagram of a testing device of Example.
- Fig. 12B is an exemplary diagram of a testing device of Example.
- Fig. 13A is an exemplary diagram of a testing device of
- Fig. 13B is an exemplary diagram of a testing device of
- FIG. 1 is a top plan view of a testing device according to an embodiment of the present invention.
- Fig. 2 is a cross -sectional diagram of the testing device of Fig. 1 taken along a line A- A.
- Fig. 3 is a cross -sectional diagram of the testing device, showing a portion at which a flow path member and a resin layer face each other.
- Fig. 4A and Fig. 4B are cross-sectional diagrams of the testing device, showing a portion at which a flow path member and a resin layer face each other.
- Fig. 5A and Fig. 5B are cross -sectional diagrams of the testing device, showing a portion at which a flow path member and a resin layer face each other.
- the testing device 10 of Fig. 1 to Fig. 5 includes: a porous flow path member 12 in which there is formed a flow path for flowing a hydrophilic test liquid 30 (an example of a sample) such as blood, spinal fluid, urine, and a sample extraction liquid (i.e., a liquid containing a sample picked with a sample picking member such as a stick); and resin layers (15a, 15b, and 15c) provided over the flow path member 12.
- a labeled antibody 16, a capture antibody 17, and a capture antibody 18 (each being an example of a reagent) that are reactive with an antigen contained in the test liquid 30 are provided as a solid phase over surfaces of the resin layers (15a, 15b, and 15c) facing the flow path member 12, respectively.
- the present embodiment of the testing device 10 to be described below is a case where the flow path member 12 is provided over a base material 11, and an absorbent member 14 is provided over the base material 11 and the flow path member 12.
- the present invention is not limited to such an embodiment.
- what is meant when it is said that something is provided over a member is that that something is provided to have contact with that member, regardless of on which side of the testing device 10 it is when the testing device 10 is set in place.
- resin layer 15a, 15b, and 15c an arbitrary resin layer among the resin layers (15a, 15b, and 15c) is to be mentioned, it will be denoted as resin layer 15.
- the reagents may be provided as a solid phase by means of any arbitrary interaction such as an arbitrary chemical bonding such as covalent bonding, hydrogen bonding, and metal bonding, attachment, adhesion, adsorption, and van der Waals binding.
- test liquid 30 is a hydrophilic test liquid such as blood, spinal fluid, urine, and a sample extraction liquid (a liquid containing a sample picked with a sample picking member such as a stick).
- the resin layer 15a (second resin layer) contains an amphiphilic resin 151 (second amphiphilic resin) having many
- hydrophilic groups 152 and it is preferable that the resin layer 15a contain the amphiphilic resin 151 as a main component (i.e., in an amount of 50% by mass or higher).
- Hydrophilic groups mean a group of atoms that form a weak bond with water molecules via hydrogen bonding or the like and have affinity with water, and amphiphilicity means affinity with both of water and an organic solvent.
- the labeled antibody 16 has a hydrophilic portion 16g, and by means of this portion, is provided as a solid phase over the surface of the resin layer 15a facing the flow path member 12.
- the hydrophilic portion 16g of the labeled antibody 16 becomes affinitive with the hydrophilic test liquid 30, and the labeled antibody 16 is released from the amphiphilic resin 151.
- the test liquid contains an antigen 31, the released labeled antibody 16 and the antigen 31 react and conjugate with each other through an antigen- antibody reaction.
- the amphiphilic resin 151 be a water-insoluble resin.
- water-insolubility means substantial insolubility to water.
- a resin is defined as water-insoluble when the resin is immersed in a large amount of water at 25°C for 24 hours, and then dried sufficiently by vacuum drying or the like, and as a result, has undergone weight change of 1% by mass or less. This is because a by-product (e.g., a monomer component) contained in the resin product may dissolve in the water and reduce the weight.
- a by-product e.g., a monomer component
- the resin layer 15b (first resin layer) be a resin having hydrophobic groups 153.
- the resin layer 15b contains a hydrophobic resin 155 or an amphiphilic resin 154 (first amphiphilic resin) that has many hydrophobic groups 153, and it is preferable that the resin layer 15b contain the hydrophobic resin 155 or the amphiphilic resin 154 as a main component (i.e., in an amount of 50% by mass or higher).
- Hydrophobic groups mean a group of atoms that tend to repel water, have a low affinity with water, and cannot easily dissolve in water or mix with water.
- the capture antibody 17 has a hydrophobic portion
- the capture antibody 17 is provided as a solid phase over the surface of the resin layer 15b facing the flow path member 12, by this hydrophobic portion binding with the surface by means of an
- the capture antibody 17 captures the antigen 31 in the state of being conjugated with the labeled antibody 16.
- the antigen 31 and the labeled antibody 16 are fixed and develop a color.
- the resin layer 15b can be used as a test line for determination of presence or absence of the antigen 31.
- the hydrophobic resin 155 and the amphiphilic resin 154 each be a water-insoluble resin.
- the resin layer 15c (first resin layer) contains a hydrophobic resin 155 or an amphiphilic resin 154 that has many hydrophobic groups 153, and it is preferable that the resin layer 15c contain the hydrophobic resin 155 or the amphiphilic resin 154 as a main component (i.e., in an amount of 50% by mass or higher).
- the capture antibody 18 is provided as a solid phase over the surface of the resin layer 15c facing the flow path member 12, by the hydrophobic portion of the capture antibody 18 binding with the surface by means of an intermolecular force.
- the capture antibody 18 is not particularly limited, except that it should be able to capture the labeled antibody 16.
- the resin layer 15c can be used as a control line for indicating that the labeled antibody 16 has reached.
- the hydrophobic resin 155 and the amphiphilic resin 154 each be a water-insoluble resin.
- the resin layers be a non-porous member.
- the non-porous member means a non-porous structure that contains substantially no voids and contrasts with a porous material such as a membrane that contains voids and is provided for promoting absorption of a liquid.
- a porous material such as a membrane that contains voids and is provided for promoting absorption of a liquid.
- a test line and a control line have been formed by directly applying a liquid in which a capture antibody is dissolved over a flow path member made of a hydrophilic porous material. Therefore, the capture antibody is diffused through the porous material as a liquid permeates therethrough.
- colorant from labeling particles such as gold colloid particles that are bound with the capture antibody present in the porous material cannot be sensed actually, because light scattering occurs. That is, much of the capture antibody is not utilized effectively.
- colorant particles that can be sensed from within a porous material are those that are present by the depth of about 5 ⁇ .
- the capture antibody is fixed by means of the resin layers made of a
- the capture antibody would not be mixed into the resin layers, but be fixed only on the surface of the resin layers.
- a color is developed by the capture antibody fixed over the surface of the resin layers being bound with labeling particles. The color can be sensed because sensing is through the resin layers made of the non-porous member that does not scatter light. Hence, the efficiency of utilization of color development by the labeling particles can be improved significantly. Because there are no extra colorant particles present in the direction of thickness, there is a merit that the amount of the capture antibody to be applied is very low.
- a flow path member made of a hydrophilic porous material is 100 ⁇ , it is only possible to utilize color development from a region present by a thickness of 5 ⁇ from the surface.
- the present invention it is possible to improve the efficiency of utilization of color development by the labeling particles significantly because resin layers made of a non-porous member having many hydrophobic groups are used for fixing the capture antibody, and it is possible to reduce the amount of the capture antibody to be applied from conventional cases because there are no extra colorant particles present in the direction of thickness.
- the testing device 10 for testing presence or absence of an antigen 31 in the test liquid 30 is described.
- the testing device of the present invention is not limited to one that utilizes an antigen-antibody reaction.
- the testing device may be configured to test a specific component contained in the test liquid 30, by using as a reagent, one that changes its hue upon a structural change.
- the base material 11 is not particularly limited, and an arbitrary base material may be selected according to the purpose. Examples thereof include organic, inorganic, and metallic base materials. It is preferable that at least one surface of the base material 11 be coated with a hydrophobic resin, although this is not limiting.
- the testing device 10 is used as a sensor chip, it is preferable to use a light, flexible, and lowcost synthetic resin as the base material 11. Further, according to the present embodiment, it is possible to select a highly durable base material 11 such as a plastic sheet, which consequently improves the durability of the testing device 10.
- Examples of the base material 11 include base materials made of polyvinyl chloride, polyethylene terephthalate, polypropylene, polystyrene, polyvinyl acetate, polycarbonate, polyacetal, modified polyphenylether, polybutylene phthalate, and an ABS resin. Among these, it is
- a base material 11 made of polyethylene terephthalate a because it is low-cost and highly versatile.
- the shape of the base material 11 is not particularly limited, but is preferably a sheet shape.
- the base material 11 may not be able to maintain strength to qualify as a base material.
- the base material may have a poor flexibility depending on the material thereof, and may lack a handling easiness as a sensor. In the present
- an average thickness may be an average of thicknesses measured with a micrometer at a total of 15 positions of the measurement target, namely 5 positions in the longer direction and 3 positions in the width direction that are at substantially equal intervals.
- a thickness can be defined as a length of a measurement target in a direction perpendicular to an interface at which the base material 11 and the flow path member 12 contact each other.
- the flow path member 12 of the testing device 10 is not
- the flow path member 12 made of a hydrophilic porous material includes voids (12a and 12b), and a flow path is formed when the test liquid 30 flows through the voids (12a and 12b).
- the voids 12a are voids formed in the respective cross-sections
- the voids 12b are voids in a deeper portion in the cross-sections. It is preferable that cells be present in the hydrophilic porous material, and that the cells be linked and form a continuous cell. A continuous cell is different from
- the cells forming a continuous cell have a minute pore in the wall between the cells. Therefore, the continuous cell has a function of absorbing a liquid by means of a capillary action or letting a gas pass through.
- the flow path member 12 delivers the test liquid 30 by utilizing a capillary action through the voids (12a and 12b). Therefore, an external actuator such as a pump is unnecessary.
- the hydrophilic porous material is not particularly limited, and an arbitrary hydrophilic porous material may be selected according to the purpose. However, it is preferably a base material having hydrophilicity and a high voidage.
- a hydrophilic porous material is a porous material that is easily permeable by an aqueous solution. A material can be said to be easily permeable, when in a test for water permeability evaluation, a plate-shaped test piece of the material is dried for 1 hour at 120°C, pure water (0.01 mL) is dropped down onto the surface of the dried test piece, and the pure water (0.01 mL) completely permeates the test piece within 10 minutes.
- the voidage of the hydrophilic porous material is not particularly limited, and may be appropriately selected according to the purpose. However, it is preferably from 40% to 90%, and more preferably from 65% to 80%. When the voidage is greater than 90%, the hydrophilic porous material may not be able to keep the strength to qualify as a base material. When the voidage is less than 40%, the permeability of the test liquid 30 may be poor.
- the voidage can be calculated according to the calculation formula 1 below, based on the basis weight (g/m 2 ) and the thickness ( ⁇ ) of the hydrophilic porous material, and the specific gravity of the component thereof.
- Voidage (%) ⁇ l-[basis weight (g/m 2 )/thickness ⁇ m)/specific gravity of the component] ⁇ l00
- the hydrophilic porous material is not particularly limited, and an arbitrary hydrophilic porous material may be selected according to the purpose. Examples thereof include filter paper, regular paper, high-quality paper, watercolor paper, Kent paper, synthetic paper, synthetic resin film, special-purpose paper having a coating layer, fabric, fiber product, film, inorganic substrate, and glass.
- Examples of the fabric include artificial fiber such as rayon, bemberg, acetate, nylon, polyester, and vinylon, natural fiber such as cotton and silk, blended fabric of those above, or non-woven fabric of those above.
- filter paper is preferable because it has a high voidage and a favorable hydrophilicity.
- the filter paper is preferable as the stationary phase of the paper chromatography.
- the shape of the hydrophilic porous material is not particularly limited and may be appropriately selected according to the purpose.
- the hydrophilic porous material is preferably a sheet-shaped.
- the average thickness of the hydrophilic porous material is not
- the hydrophilic porous material may not be able to keep the strength to qualify as a base material.
- test liquid 30 When the average thickness is greater than 0.3 mm, a requisite amount of the test liquid 30 may be high.
- Fig. 6 is a conceptual diagram of a conjugate pad of a conventional testing device.
- Fig. 7 is a conceptual diagram of a membrane of a conventional testing device. It has been often the case with a conventional testing device that when the conjugate pad has an excessively high hydrophilicity, the conjugate pad tends to retain the test liquid therein and cannot flow it to the membrane smoothly. On the other hand, when the conjugate pad has an excessively high hydrophobicity, the conjugate pad can flow the test liquid to the membrane smoothly, but has a poor absorptivity of the test liquid from the sample pad, which has been the cause of a long testing time and a high requisite amount of the test liquid. Therefore, there have been limitations to fibers Fl that can be used as a conjugate pad.
- the labeled antibody 16 is provided as a solid phase over the fiber Fl constituting the conjugate pad (see Fig. 6). Therefore, labeled antibodies 16 that can be released from the conjugate pad are only those that have a weak binding with the fiber Fl. That is, fibers Fl and labeled antibodies 16 that can be used in the conventional testing device are limited in terms of design.
- the capture antibody 17 is provided as a solid phase over a fiber F2 constituting the membrane (see Fig. 7). Therefore, capture antibodies 17 that can be fixed on the membrane are only those that have a strong binding with the fiber F2. That is, fibers F2 and capture antibodies 17 that can be used in the conventional testing device are limited in terms of design.
- the reagents such as the labeled antibody 16, the capture antibody 17, and the capture antibody 18 are provided as a solid phase over resin layers (15a, 15b, and 15c). Therefore, it is possible to control release or fixing of the reagents depending on the strength of interaction between the resin layers 15 and the reagents and affinity of the resin layers with the test liquid 30.
- the method for adjusting the strength of interaction and affinity may be a method of changing the kind or the composition ratio of the resin constituting the resin layers 15 depending on the corresponding reagents.
- a hydrophobic interaction means a cause (driving force) of a change occurring in water that hydrophobic molecules or hydrophobic groups that repel water coalesce with each other. More specifically, in many cases when hydrophobic molecules or molecules having a hydrophobic group are added in water, not only do they not dissolve in water, but the
- hydrophobic molecules and hydrophobic groups come into contact with each other and try as hard as possible to reduce the contact area with the water molecules.
- the hydrophobic molecular species coalesce with each other, and appear to have a binding force between the molecules. This phenomenon is called a hydrophobic interaction.
- a hydrophilic percentage is high in the resin constituting the resin layers 15, it is estimated that although the resin layers 15 have a strong interaction with a hydrophilic reagent, the reagent becomes affinitive with the test liquid 30 and is easily released into the test liquid 30 when the binding portion comes into contact with the hydrophilic test liquid 30.
- the resin constituting the resin layers 15 be a water-insoluble resin.
- a water-insoluble resin can avoid dissolving in the test liquid 30, and hence prevent clogging the flow path or smudging a control line or a test line.
- the amphiphilic resin of which the resin layer 15a is mainly composed include polyvinyl alcohols, a polyvinyl acetal resin, polyacrylic acid, an acrylic acid/acrylonitrile copolymer, a vinyl acetate/acrylic ester copolymer, an acrylic acid/acrylic ester copolymer, a styrene/acrylic acid copolymer, a styrene/methacrylic acid copolymer, a styrene/methacrylic acid/acrylic ester copolymer, a styrene/ ⁇ - methyl styrene/acrylic acid copolymer, a styrene/oc-methyl styrene/
- vinylnaphthalene/acrylic acid copolymer a vinylnaphthalene/maleic acid copolymer, a vinyl acetate/maleic ester copolymer, a vinyl acetate/cro tonic acid copolymer, a vinyl acetate/acrylic acid copolymer, and a salt of these.
- One of these may be used alone, or two or more of these may be used in combination.
- a copolymer of a monomer having a hydrophobic functional group and a monomer having a hydrophilic functional group, and a polymer produced from a monomer having both of a hydrophobic functional group and a hydrophilic functional group are preferable.
- the copolymer may be any of a random copolymer, a block copolymer, an alternate copolymer, and a graft copolymer.
- hydrophobic resin of which the resin layers 15b and 15c are mainly composed examples include ⁇ a polystyrene-based resin such as polystyrene, and an acrylonitrile/butadiene/styrene-based resin! a polyolefin-based resin or a cyclic polyolefin-based resin such as a
- polymethyl pentene resin and polyacrylonitrile
- a cellulose -based resin such as a propionate resin
- natural wax such as beeswax, carnauba wax, spermaceti, Japan tallow, candelilla wax, rice wax, and montan wax
- synthetic wax such as paraffin wax
- microcrystalline wax oxide wax, ozokerite, ceresin, ester wax,
- higher fatty acid such as margaric acid, lauric acid, myristic acid, palmitic acid, stearic acid, furoic acid, and behenic acid
- higher alcohol such as stearin alcohol and behenyl alcohol
- esters such as sorbitan fatty acid ester
- amides such as stearamide and oleic amide.
- polystyrene resin, polyolefin resin, carnauba wax, and polyethylene wax are examples of these may be used alone or two or more of these may be used in combination.
- the resin constituting the resin layer 15a have a greater degree of hydrophilicity than that of the resin constituting the resin layers (15b and 15c).
- the same kind of a resin it is not indispensable to measure the hydrophilicity to say that one resin layer has a greater degree of hydrophilicity, as long as it contains a greater percentage of hydrophilic groups.
- the labeled antibody 16 provided as a solid phase over the resin layer 15a is not particularly limited, except that it should have a
- hydrophilic portion and be able to react with the antigen 31.
- examples thereof include a gold colloid-labeled antibody such as gold colloid-labeled anti-human IgG, and labeled antibody against various allergens.
- Particles for labeling the antibody are not particularly limited to gold colloid, and other examples include colloid of any other metal, enzyme labeling particles containing an enzyme, coloring particles containing a pigment, fluorescent particles containing a fluorescent substance, and magnetic body-capsulating particles containing a magnetic body.
- the capture antibody 17 provided as a solid phase over the resin layer 15b is not particularly limited except that it should have a hydrophobic portion and be able to react with the antigen 31. Examples thereof include anti-human IgG, and antibodies against various allergens.
- the antibody may be a monoclonal antibody, a polyclonal antibody, a chimeric antibody, a Fab antibody, and a (Fab)2 antibody.
- the antibody 18 provided as a solid phase over the resin layer 15c is not particularly limited except that it should have a hydrophobic group and be able to react with the labeled antibody 16.
- Examples thereof include an antibody against the labeled antibody 16, such as Human IgG.
- Other examples thereof include the antibodies given above.
- the method for providing the reagents such as the labeled antibody 16 and the capture antibodies (17 and 18) over the resin layers 15 is not particularly limited, and may be a method of applying a solution containing the reagents over the resin layers 15 and then fast-drying the solution, or a method of applying a solution containing the reagents over the resin layers 15, keeping the solution-applied resin layers stationary under a humid atmosphere so as not for the applied solution to dry, washing the surface of the resin layers as lightly as rinsing with a liquid containing the same components as the aqueous solution in which the reagents are dissolved, and then drying the surface.
- the resin layers 15 be fixed over the flow path member 12.
- the method for fixing the resin layers 15 is not particularly limited, except that the resin layers should be fixed such that the reagents and the test liquid 30 can contact each other during a test.
- Specific examples of the method include a method of thermally transferring the resin to constitute the resin layers onto the flow path member 12 with a thermal transfer printer or the like, a method of transferring the resin to constitute the resin layers by applying a pressure thereto with a dot impact printer or the like, and a method of sticking the resin to constitute the resin layers to the flow path member 12 with a tape, an adhesive, a gluing agent, or the like.
- the absorbent member 14 is not particularly limited, and any absorbent member may be selected from publicly-known materials as long as it is water-absorptive.
- Examples of the absorbent member 14 include paper, a fiber such as cloth, a high -molecular compound having a carboxyl group or a salt thereof, a partially cross-linked product of a
- high-molecular compound having a carboxyl group or a salt thereof, and a partially cross-linked product of a polysaccharide.
- the resin layers 15 may be provided over the flow path member 12 by various methods. As an example, a case of using a thermal transfer method will be described below. A transfer member for fabrication of the testing device 10 and a transfer method, which are used in a thermal transfer method, will be described below.
- Fig. 8 is a cross-sectional diagram of a reagent transfer member according to an embodiment of the present invention.
- a thermal transfer method it is possible to use a transfer member that is previously coated with a reagent uniformly. Therefore, it is possible to suppress the capture antibodies (17 and 18) from being varied in
- a reagent transfer member 100 (an example of a transfer member) includes a support member 101, a release layer 102 provided over the support member 101, and a solid reagent phase layer 103 provided over the release layer 102. A reagent is provided as a solid phase over a surface of the solid reagent phase layer 103.
- the reagent transfer member 100 further includes other layers such as a back layer 104 according to necessity.
- the shape, structure, size, material, etc. of the support member 101 are not particularly limited, and may be appropriately selected according to the purpose.
- the structure may be a single-layered structure, or a multilayered structure.
- the size of the support member may be appropriately selected according to the size of the testing device 10, etc.
- the material of the support member 101 is not particularly limited, and may be appropriately selected according to the purpose.
- polyester such as polyethylene terephthalate
- PET polyethylene naphthalate
- PEN polyethylene naphthalate
- PI polyimide resin
- PI polyamide
- polyethylene polypropylene
- ' polyvinyl chloride " polyvinylidene chloride
- polystyrene a styrene/acrylonitrile copolymer
- cellulose acetate cellulose acetate.
- PET polyethylene terephthalate
- PEN polyethylene naphthalate
- a surface activation treatment it is preferable to apply a surface activation treatment to a surface of the support member 101 in order to impart a better close adhesiveness with a layer to be provided over the support member 101.
- Examples of the surface activation treatment include a glow discharge treatment and a corona discharge treatment.
- the support member 101 may be kept there. Alternatively, after the solid reagent phase layer 103 is transferred, the support member 101 may be peeled and removed by means of the release layer 102.
- the support member 101 is not particularly limited, and may be an appropriately synthesized product or a commercially available product.
- the average thickness of the support member 101 is not particularly limited, and may be appropriately selected according to the purpose. However, it is preferably from 3 ⁇ to 50 ⁇ .
- the release layer 102 has a function of improving separability between the support member 101 and the solid reagent phase layer 103 during transfer.
- the release layer 102 also has a function of thermally melting to a low viscosity liquid when heated with a heating/pressurizing unit such as a thermal head to thereby make it easier for the solid reagent phase layer 103 to be separated at the interface between the heated portion and a non-heated portion.
- the release layer 102 contains a wax and a binder resin, and further contains other components appropriately selected according to necessity.
- the wax is not particularly limited, and an appropriate wax may be selected according to the purpose. Examples thereof include: natural wax suc as beeswax, carnauba wax, spermaceti, Japan tallow, candelilla wax, rice wax, and montan wax, ' synthetic wax such as paraffin wax, microcrystalline wax, oxide wax, ozokerite, ceresin, ester wax,
- polyethylene wax and polyethylene oxide wax
- ' higher fatty acid such as margaric acid, lauric acid, myristic acid, palmitic acid, stearic acid, furoic acid, and behenic acid
- ' higher alcohol such as stearin alcohol and behenyl alcohol
- esters such as sorbitan fatty acid ester, ' and amides such as stearamide and oleic amide.
- carnauba wax and polyethylene wax are preferable because they are excellent in releasability.
- the binder resin is not particularly limited, and appropriate binder resin may be selected according to the purpose. Examples thereof include an ethylene/vinyl acetate copolymer, a partially saponified ethylene/vinyl acetate copolymer, an ethylene/vinyl alcohol copolymer, an ethylene/sodium methacrylate copolymer, polyamide, polyester,
- polyurethane polyvinyl alcohol, methyl cellulose, carboxymethyl cellulose, starch, polyacrylic acid, an isobutylene/maleic acid copolymer, a
- styrene/maleic acid copolymer polyacrylamide, polyvinyl acetal, polyvinyl chloride, polyvinylidene chloride, an isoprene rubber, a styrene/butadiene copolymer, an ethylene/propylene copolymer, a butyl rubber, and an acrylonitrile/butadiene copolymer.
- One of these may be used alone, or two or more of these may be used in combination.
- the method for forming the release layer 102 is not particularly limited, and an appropriate method may be selected according to the purpose. Examples thereof include a hot-melt coating method, and a coating method using a coating liquid obtained by dispersing the wax and the binder resin in a solvent.
- the average thickness of the release layer 102 is not particularly limited and may be appropriately selected
- the amount of deposition of the release layer 102 is not particularly limited and may be appropriately selected according to the purpose.
- the solid reagent phase layer 103 needs only to contain a resin to constitute the resin layers 15 of the testing device 10, and the material thereof is not limited.
- the method for forming the solid reagent phase layer 103 is not particularly limited, and an appropriate method may be selected according to the purpose. For example, as a hot-melt coating method or a coating method using a reagent coating liquid obtained by dispersing the resin to constitute the resin layers 15 in a solvent, a common coating method using a gravure coater, a wire bar coater, a roll coater, or the like may be used. According to such a method, the support member 101 or the release layer 102 is coated with the solid reagent phase layer coating liquid. When the liquid is dried, the solid reagent phase layer is formed.
- the average thickness of the solid reagent phase layer 103 is not particularly limited and may be appropriately selected according to the purpose. However, it is preferably from 200 nm to 50 ⁇ . When the average thickness is less than 200 nm, the resin layer may have a poor durability and be broken by friction or an impact. When the average thickness is greater than 50 ⁇ , it becomes harder for heat from the thermal head to be conducted uniformly through the solid reagent phase layer, to thereby degrade sharpness.
- the amount of deposition of the reagent coating liquid in the solid reagent phase layer 103 is not particularly limited, and may be
- the amount of deposition is preferably from 0.2 g/m 2 to 50 g/m 2 .
- the amount of deposition is less than 0.2 g/m 2 , the coating amount may be insufficient, and the resin layers may have deficits.
- the amount of deposition is greater than 50 g/m 2 , it may take time to dry the liquid, or the resin layers may have unevenness.
- the reagent coating liquid is dried and the solid reagent phase layer 103 is formed, it is possible to form the labeled antibody 16 or the capture antibody (17 or 18) as a solid phase over the surface of the solid reagent phase layer 103, by applying a solution containing the labeled antibody 16 or the capture antibody (17 or 18) over the surface of the solid reagent phase layer 103 to form a uniform coating film, and then drying the coating film. It is preferable that the coating film be applied to have a uniform thickness.
- the drying method is not particularly limited and may be through-flow drying, vacuum drying, natural drying, freeze drying, etc. However, it is preferable to dry the coating film at reduced pressure or in a vacuum.
- the drying temperature is preferably room temperature of from 20°C to 50°C, and the drying time is preferably from 30 minutes to 24 hours. When the drying temperature is lower than 20°C, it takes a longer time to dry, which may reduce the
- the drying temperature is higher than 50°C, the reagent may be degenerated.
- the drying time is shorter than 30 minutes, the coating film may be dried insufficiently.
- the productivity may be low, and the color of the resin may be changed depending on the kind of the resin.
- the reagent coating liquid is dried and the solid reagent phase layer 103 is formed, it is also possible to form the labeled antibody 16 or the capture antibody (17 or 18) as a solid phase, by applying a solution containing the labeled antibody 16 or the capture antibody (17 or 18) over the surface of the solid reagent phase layer 103, keeping the solution-applied solid reagent phase layer 103 stationary under a humid atmosphere so as not for the applied solution to dry, washing the surface of the resin layer as lightly as rinsing with a liquid containing the same components as the aqueous solution in which the reagents are dissolved, and then drying the surface.
- Preferable ranges of the drying conditions drying time, drying temperature) are as described above.
- the reagent transfer member 100 include a back layer 104 over a surface of the support member 101 opposite to a surface thereof over which the release layer 102 is provided. During transfer, heat is directly applied by a thermal head or the like to this opposite surface in a manner to match the shape of the resin layers.
- the back layer 104 have resistance to high heat, and resistance to friction with the thermal head or the like.
- the back layer 104 contains a binder resin, and further contains other components according to necessity.
- the binder resin is not particularly limited, and an arbitrary binder resin may be selected according to the purpose. Examples thereof include a silicone -modified urethane resin, a silicone-modified acrylic resin, a silicone resin, a silicone rubber, a fluorine resin, a polyimide resin, an epoxy resin, a phenol resin, a melamine resin, and nitrocellulose.
- One of these may be used alone, or two or more of these may be used in combination.
- the other components are not particularly limited, and arbitrary components may be selected according to the purpose. Examples thereof include inorganic particles such as talc, silica, and organopolysiloxane, and a lubricant.
- the method for forming the back layer 104 is not particularly limited, and an arbitrary method may be selected according to the purpose. Examples thereof include a common coating method using a gravure coater, a wire bar coater, a roll coater, etc.
- the average thickness of the back layer 104 is not particularly limited, and may be appropriately selected according to the purpose. However, it is
- ⁇ Undercoat Layer- It is possible to provide an undercoat layer between the support member 101 and the release layer 102, or between the release layer 102 and the solid reagent phase layer 103.
- the undercoat layer contains a resin, and further contains other components according to necessity.
- the resin is not particularly limited, and an arbitrary resin may be selected according to the purpose.
- the various kinds of resins usable as the solid reagent phase layer 103 and the release layer 102 can be used.
- ⁇ Protective Film- It is preferable to provide a protective film over the solid reagent phase layer 103 for protection from contamination or damages during storage.
- the material of the protective film is not particularly limited, and an arbitrary material may be selected according to the purpose as long as it can be peeled from the solid reagent phase layer 103 easily.
- the average thickness of the protective film is not particularly limited, and may be appropriately selected according to the purpose. However, it is preferably from 5 ⁇ to 100 ⁇ , and more preferably from 10 ⁇ to 30 ⁇ .
- the method for thermally transferring the solid reagent phase layer 103 onto the flow path member 12 may be a method including a step of bringing the solid reagent phase layer 103 of the reagent transfer member 100 into contact with the flow path member 12, and transferring the solid reagent phase layer 103 onto the flow path member 12.
- a printer used for thermal transfer is not particularly limited, and an arbitrary printer may be selected according to the purpose. Examples thereof include a thermal printer including a serial thermal head, a line-shaped thermal head, or the like.
- the energy applied for thermal transfer is not particularly limited, and may be appropriately selected according to the purpose. However, it is preferably from 0.05 mJ/dot to 0.5 mJ/dot.
- the solid reagent phase layer 103 may be melted insufficiently.
- the reagent may be degenerated due to heat, or any portion of the reagent transfer member 100 other than the solid reagent phase layer 103 may be melted to contaminate the thermal head.
- testing device 10 is not particularly limited, and arbitrary applications may be selected according to the purpose. Examples thereof include a biochemical sensor (sensing chip) for blood testing or DNA testing, and a compact analytical device (chemical sensor) for quality control of foods and beverages.
- biochemical sensor sensing chip
- compact analytical device chemical sensor
- samples may be selected according to the purpose.
- examples thereof include a pathogen such as a bacterium and a virus, blood, saliva, a lesional tissue, etc. separated from living organisms, and egestion such as enteruria.
- the sample may be a part of a fetus cell in an amniotic fluid, or of a dividing egg cell in a test tube.
- these samples may be, after condensed to a sediment directly or by centrifugation or the like according to necessity, subjected to a pre-treatment for cell
- the testing device 10 of the present embodiment also has a function of performing chromatography (separation and refinement) of a test liquid, because the flow path member 12 serves as a stationary phase.
- the flow path member 12 containing a continuous cell of which internal wall has hydrophilicity serves as the stationary phase (a carrier).
- the stationary phase a carrier
- a component having a higher hydrophilicity is more likely to adsorb to the porous portion serving as the stationary phase, and repeats adsorbing and desorbing more times. Therefore, such a component permeates the fluid path at a lower speed. Conversely, a component having a higher hydrophobicity permeates without adsorbing to the stationary phase. Therefore, such a component moves rapidly through the fluid path.
- testing device 10 As a highly functional chemical or biochemical sensor. « ⁇ Testing Method»>
- a testing method using the testing device 10 is not particularly limited, and may include a step of supplying a hydrophilic test liquid into the flow path member 12 of the testing device 10, and a step of bringing the labeled antibody 16 (an example of a reagent) formed as a solid phase over the resin layer 15a into contact with the test liquid 30 to thereby release the labeled antibody from the resin layer 15a.
- the testing method using the testing device 10 may include a step of supplying the test liquid 30 into the flow path member of the testing device 10, and a step of capturing an antigen 31 (an example of a portion of a sample) with the capture antibody 17 formed as a solid phase over the resin layer 15b, when any antigen 31 is contained in the test liquid 30.
- the hydrophilic test liquid 30 is dropped and supplied into a dropping portion 12c (see Fig. l) formed in the flow path member 12 of the testing device 10. Subsequently, the supplied test liquid 30 is brought into contact with the labeled antibody 16 formed as a solid phase over the resin layer 15a, so that the labeled antibody may be released from the resin layer 15a.
- the labeled antibody 16 released from the resin layer 15a reacts and conjugates with the antigen 31 (see Fig. 3).
- the capture antibody 17 is formed as a solid phase over the resin layer 15b by means of the hydrophobic group 17g. Therefore, even when it contacts the test liquid 30, it does not become affinitive with the test liquid 30 and is not easily released into the test liquid. Even if a portion of the capture antibody 17 is released into the test liquid 30, the released portion binds with a fiber constituting the flow path member 12 soon after. Hence, the labeled antibody 16 is fixed at just about the resin layer 15b, and hence the test line sharply develops a color (see Fig. 4A and Fig. 4B).
- the capture antibody 18 having a hydrophobic group is formed as a solid phase over a surface of the resin layer 15c facing the flow path member 12.
- the labeled antibody 16 conjugates with the capture antibody 18 and is hence captured.
- the capture antibody 18 is formed as a solid phase over the resin layer 15c by means of a hydrophilic group. Therefore, even when it contacts the test liquid 30, it does not become affinitive with the test liquid 30 and is not easily released into the test liquid.
- testing kit that includes : the testing device
- FIG. 9 is a conceptual diagram of a testing kit according to an embodiment of the present invention.
- the tool for picking a sample include publicly-known tools such as a sterilized cotton swab 51 for picking a sample from throat, nasal cavity, or the like.
- the liquid for treating a sample include publicly-known liquids such as a dilution buffer 52 for diluting a sample, and an extractant liquid for extracting a sample. « ⁇ Supplemental to Embodiment»>
- An indicator used in a chemical assay means a reagent that indicates a chemical property of a solvent.
- the indicator is not particularly limited, and examples thereof include a pH indicator, various ionophores that change colors by reacting with various ions such as a lead ion, a copper ion, and a nitrite ion, and reagents that change colors by reacting with various agricultural chemicals.
- the embodiment described above is about a case where the support member 101 and the solid reagent phase layer 103 of the reagent transfer member 100 are separated from each other by heat during transfer.
- the present invention is not limited to this
- the support member 101 and the solid reagent phase layer 103 may be separated from each other by light.
- the release layer 102 may contain a light absorption agent such as carbon black, so that it may generate heat by absorbing light. In this way, the release layer 102 may be melted to let the solid reagent phase layer 103 be separated.
- the release layer 102 may contain a material that degenerates upon light irradiation. By making the material absorb light to make the release layer 102 fragile, it is possible to separate the solid reagent phase layer 103.
- the embodiment described above is about a case where a flow path is formed throughout the flow path member 12.
- the present invention is not limited to this.
- the testing device 10 of the present embodiment may be provided with an arbitrary protective member for the purposes of preventing contamination when a hand touches the flow path member 12.
- Examples of such a protective member include a housing that covers the entire testing device 10, and a film provided over the flow path member 12.
- a protective member When providing a protective member, it is preferable to form an opening at a portion thereof that is above the dropping portion 12c of the flow path member 12. It is also preferable to form an opening in the protective member for releasing pressure in the flow path.
- the embodiment described above is about a case where the resin layers 15 are provided at a plurality of positions over the flow path member 12. However, depending on the kind of the reagent, there may be a resin layer 15 at only one position over the flow path member 12.
- the flow path member 12 that is provided with a resin layer 15al over which a reagent that specifically binds with a component A in the test liquid is formed as a solid phase, and resin layers 15b 1 and 15cl over which reagents for capturing them are formed as a solid phase is further provided with a resin layer 15a2 over which a reagent that specifically binds with a component B in the test liquid is formed as a solid phase, and resin layers 15b2 and 15c2 over which reagents for capturing them are formed as a solid phase, a testing device that can detect a plurality of components at the same time can be obtained.
- the test liquid 30 is hydrophilic.
- the test liquid may be a solvophilic test liquid that contains an organic solvent such as alcohols (e.g., methyl alcohol, ethyl alcohol, 1-propyl alcohol, and 2-propyl alcohol), and ketones (e.g., acetone, and MEK (methyl ethyl ketone)).
- alcohols e.g., methyl alcohol, ethyl alcohol, 1-propyl alcohol, and 2-propyl alcohol
- ketones e.g., acetone, and MEK (methyl ethyl ketone)
- a silicone-based rubber emulsion (KS779H manufactured by Shin-Etsu Chemical Co., Ltd., with a solid content of 30% by mass) (16.8 parts by mass), a chloroplatinic acid catalyst (0.2 parts by mass), and toluene (83 parts by mass) were mixed, to thereby obtain a back layer coating liquid.
- a polyethylene wax (POLYWAX 1000 manufactured by Toyo ADL Corporation, with a melting point of 99°C, and a needle penetration of 2 at 25°C) (14 parts by mass), an ethylene/vinyl acetate copolymer (EV-150 manufactured by Du Pont-Mitsui Polychemicals Co., Ltd., with a weight average molecular weight of 2,100, and VAc of 21%) (6 parts by mass), toluene (60 parts by mass), and methyl ethyl ketone (20 parts by mass) were dispersed until the average particle diameter became 2.5 ⁇ , to thereby obtain a release layer coating liquid.
- EV-150 ethylene/vinyl acetate copolymer manufactured by Du Pont-Mitsui Polychemicals Co., Ltd., with a weight average molecular weight of 2,100, and VAc of 21%)
- a polyvinyl butyral resin (BL-10 manufactured by Sekisui Chemical Co., Ltd., with a butyralation degree of 72mol%) (5 parts by mass), and ethanol (95 parts by mass) were mixed, to thereby obtain a fixing-purpose solid reagent phase layer coating liquid.
- a polyvinyl butyral resin (BL-1 manufactured by Sekisui) is a polyvinyl butyral resin (BL-1 manufactured by Sekisui).
- An antibody dilution buffer (Dulbecco's phosphate buffered saline D8662 manufactured by Sigma Aldrich Co., LLC.) was added to an anti-human IgG antibody (11886 manufactured by Sigma Co.) such that the antibody would be prepared to be 0.9 mg/mL, to thereby obtain a test line reagent coating liquid.
- a gold colloid coating liquid a 20 mM tris-HCl buffer (with pH of 8.2), 0.05% by mass polyethylene glycol, and 5% by mass sucrose
- the back layer coating liquid was applied to one surface of a support member, which was a polyethylene terephthalate (PET) film
- the release layer coating liquid was applied over a surface of the PET film opposite to the surface over which the back layer was formed, and dried at 50°C for 180 seconds, to thereby form a release layer having an average thickness of 85 ⁇ .
- the fixing-purpose solid reagent phase layer coating liquid was applied over the release layer, and dried at 70°C for 60 seconds, to thereby form a solid reagent phase layer having an average thickness of 5 ⁇ .
- the test line reagent coating liquid was applied over the solid reagent phase layer, and dried at 25°C for 5 hours, to thereby form the reagent as a solid phase over the solid reagent phase layer. In this way, a test line thermal transfer member was obtained.
- the fixing-purpose solid reagent phase layer coating liquid was applied over the release layer, and dried at 70°C for 60 seconds, to thereby form a solid reagent phase layer having an average thickness of 5 ⁇ .
- the control line reagent coating liquid was applied over the solid reagent phase layer, and dried at 25°C for 5 hours, to thereby form the reagent as a solid phase over the solid reagent phase layer. In this way, a control line thermal transfer member was obtained.
- a back layer and a release layer were formed in the manner described above. After this, the release-purpose solid reagent phase layer coating liquid was applied over the release layer, and dried at 70°C for 60 seconds, to thereby form a solid reagent phase layer having an average thickness of 5 ⁇ . Then, the labeled antibody reagent coating liquid was applied over the solid reagent phase layer in an amount of 12 ⁇ ,/ ⁇ 2 , and dried at 25°C for 5 hours, to thereby form a labeled antibody layer over the solid reagent phase layer. In this way, a labeled antibody thermal transfer member was obtained.
- thermoplastic resin which was a polyester-based hot-melt adhesive (ALONMELT PES375S40 manufactured by Toagosei Co., Ltd.), was heated to 190° C, and then with a roll coater, applied over a PET film (LUMIRROR S10 manufactured by Toray Industries, Inc., with an average thickness of 50 ⁇ ) cut into a size of 40 mm in width and 80 mm in length, to have a thickness of 50 ⁇ over the PET film, to thereby form an adhesive layer.
- PET film LMIRROR S10 manufactured by Toray Industries, Inc., with an average thickness of 50 ⁇
- This applied product was kept stationary for 2 hours or longer.
- each of the materials shown in Table 1 each of which was cut into a size of 40 mm in width and 70 mm in length, was overlapped with the adhesive layer-applied surface such that a
- the voidage of the paper substrates A to E was calculated according to the calculation formula 1 below, based on the basis weight (g/m 2 ) and the thickness ( ⁇ ) of the paper substrates, and the specific gravity of the component thereof.
- Voidage (%) ⁇ l-[basis weight (g/m 2 )/thickness ⁇ mVspecific gravity of the component] ⁇ x 100
- the paper substrates could be said to be porous. From the results in Table 1 below, all of the paper substrates A to E were porous.
- Fig. 10A is a top plan view of a testing device of Example.
- Fig. 10B is a
- a thermal head having a dot density of 300 dpi manufactured by TDK Corporation was used at a printing speed of 42 mm/sec and at a printing energy of 0.17 mJ/dot, and constructed as an evaluation system for evaluation of the printing.
- test line thermal transfer member was transferred onto a position that was 15 mm away from the position to which the labeled antibody thermal transfer member was transferred, to form a line shape having a width of 0.7 mm and a length of 4 mm, as shown in Fig. 10A and Fig. 10B. Then, the control line thermal transfer member was
- the absorbent member 14 (CFSP 223000 manufactured by Merck Millipore Corporation) was provided as shown in Fig. 10A and Fig. 10B, to thereby obtain immunochromatography assays (testing devices 10) A to E of Example 1.
- An antibody dilution buffer (Dulbecco's phosphate buffered saline D8662 manufactured by Sigma Aldrich Co., LLC.) was added to human IgG such that the human IgG would be prepared to be 500 ⁇ g/mL, to thereby obtain a test liquid.
- test liquid 100 ⁇ L was dropped into the upstream end portion of the immunochromatography assays A to E. Thirty minutes later, the immunochromatography assays were observed. Any of them in which color development could be clearly recognized at the positions of the test line and the control line, and the color development had a uniform density all along and was continuous as lines was evaluated as A. Any of them in which color development was continuous as lines to suffice for determination, but had some density variations from place to place was evaluated as B. Any of them in which color development could be recognized narrowly and formed lines, but the lines were discontinuous partially was evaluated as C. Any of them in which color development was not in line shapes, such as a case where no color development could be recognized, or a case where lines flowed to the downstream side was evaluated as D.
- the immunochromatography assays after the color development which were used in [l], were put into a housing case for measurement, and measured with a chromato-reader (DIASCAN 10 manufactured by Otsuka Electronics Co., Ltd.) to obtain an optical density of the lines. A higher optical density is more preferable.
- DIMSCAN 10 manufactured by Otsuka Electronics Co., Ltd.
- immunochromatography assays those having an optical density of 250 or higher were evaluated as A, those having an optical density of 150 or higher but lower than 250 were evaluated as B, those having an optical density of 50 or higher but lower than 150 were evaluated as C, and those that had an optical density of lower than 50 or could not be measured because no lines could be recognized were evaluated as D.
- chemical assays those having an optical density of 400 or higher were evaluated as A, those having an optical density of 250 or higher but lower than 400 were evaluated as B, those having an optical density of 100 or higher but lower than 250 were evaluated as C, and those that had an optical density of lower than 100 or could not be measured because no lines could be recognized were evaluated as D. Evaluation results are shown in Table 4a and Tables 4b- 1 and 4b-2.
- Immunochromatography assays A to E of Example 2 were fabricated in the same manner as in Example 1, except that the polyvinyl butyral resin used for the fixing-purpose solid reagent phase layer coating liquid in Example 1 was changed to a polyvinyl acetal resin (KS-10 manufactured by Sekisui Chemical Co., Ltd., with an acetalation degree of 78mol%), and the polyvinyl butyral resin used for the release-purpose solid reagent phase layer coating liquid in Example 1 was changed to a polyvinyl butyral resin (a mixed type having an acetoacetal group and a butyral group) (BX-L manufactured by Sekisui Chemical Co., Ltd., with an acetalation degree of 63 ⁇ 3mol%).
- KS-10 polyvinyl acetal resin
- BX-L a mixed type having an acetoacetal group and a butyral group
- Immunochromatography assays A to E of Example 3 were fabricated in the same manner as in Example 1, except that the anti-human IgG antibody used for the test line reagent coating liquid in Example 1 was changed to an anti-hCG monoclonal antibody
- Example 1 (566-70621 manufactured by Wako Pure Chemical Industries, Ltd.), and the gold colloid-labeled anti-human IgG antibody used for the labeled antibody reagent coating liquid in Example 1 was changed to a gold colloid-labeled antibody produced in the manner described below.
- a KH2PO4 buffer (pH of 7.0) that was prepared to be 50 mM was added in an amount of 1 mL to a gold colloid solution (EMGC50 manufactured by BBI Solutions Inc.) (90 mL).
- EMGC50 manufactured by BBI Solutions Inc.
- an anti-hCG monoclonal antibody (ANTI-HCG 5008 SP-5 manufactured by Medix Biochemica Inc.) that was prepared to be 50 ⁇ g/mL was added thereto in an amount of 1 mL, and they were stirred.
- a 1% by mass polyethylene glycol aqueous solution (168-11285 manufactured by Wako Pure Chemical Industries, Ltd.) was added thereto in an amount of 550 ⁇ , and they were stirred.
- a 10% by mass BSA aqueous solution (A-7906 manufactured by Sigma Aldrich Co., LLC.) was added thereto in an amount of 1.1 mL, and they were stirred.
- the obtained solution was centrifuged for 30 minutes, and from which, a supernatant was removed except for about 1 mL of the supernatant.
- the resultant was treated with an ultrasonic cleaner to redisperse the gold colloid.
- the centrifugation was performed with a centrifuge (HIMAC CF16RN manufactured by Hitachi Koki Co., Ltd.), at a centrifugal acceleration of 8,000xg, and at 4°C.
- the resultant was dispersed in a gold colloid preservation liquid (a 20 mM tris-HCl buffer (pH of 8.2), 0.05% by mass polyethylene glycol, 150 mM NaCl, a 1% by mass BSA aqueous solution, and a 0.1% by mass NaN3 aqueous solution) (20 mL), and again centrifuged under the same conditions as described above. From which, a supernatant was removed except for about 1 mL of the supernatant. The resultant was treated with an ultrasonic cleaner to redisperse the gold colloid, to thereby obtain a gold
- hCG recombinant hCG, 7727-CGO10 manufactured by R&D Systems, Inc.
- hCG recombinant hCG, 7727-CGO10 manufactured by R&D Systems, Inc.
- test liquid 100 ⁇ was dropped into the upstream end portion of the immunochromatography assays A to E. Thirty minutes later, the immunochromatography assays were observed. Any of them in which color development could be clearly recognized at the positions of the test line and the control line, and the color development had a uniform density all along and was continuous as lines was evaluated as A. Any of them in which color development was continuous as lines to suffice for determination, but had some density variations from place to place was evaluated as B. Any of them in which color development could be recognized narrowly and formed lines, but the lines were discontinuous partially was evaluated as C. Any of them in which color development was not in line shapes, such as a case where no color development could be recognized, or a case where lines flowed to the downstream side was evaluated as D. Evaluation results are shown in Table 4a and Tables 4b- 1 and 4b-2.
- An antibody dilution buffer (Dulbecco's phosphate buffered saline D8662 manufactured by Sigma Aldrich Co., LLC.) was added to an anti-human IgG antibody (11886 manufactured by Sigma Co.), such that the antibody would be prepared to be 10 g/mL, to thereby obtain a test line reagent coating liquid.
- a labeled antibody reagent coating liquid was obtained in the same manner as in Example 1.
- Example 2 In the same manner as in Example 1, a back layer having an average thickness of 0.02 ⁇ was formed over one surface of a PET film (LUMIRROR F57 manufactured by Toray Industries, Inc.) having an average thickness of 4.5 ⁇ .
- a PET film (LUMIRROR F57 manufactured by Toray Industries, Inc.) having an average thickness of 4.5 ⁇ .
- Example 2 In the same manner as in Example 1, a release layer having an average thickness of 85 ⁇ was formed.
- the fixing-purpose solid reagent phase layer coating liquid was applied over the release layer, and dried at 70°C for 60 seconds, to thereby form a solid reagent phase layer (resin layer) having an average thickness of 5 ⁇ .
- the test line reagent coating liquid was applied over the solid reagent phase layer in an amount of 100 ⁇ L per unit area (cm 2 ), to form a water film.
- the thermal transfer member was set in a container maintained to a relative humidity of 80% so as not to let the water film dry, and kept stationary at 37°C for 1 hour.
- the surface of the solid reagent phase layer was washed with an antibody dilution buffer, and dried in a vacuum dryer at 25°C for 1 hour, to thereby form the reagent as a solid phase over the solid reagent phase layer. In this way, a test line thermal transfer member was obtained.
- fixing-purpose solid reagent phase layer coating liquid was applied over the release layer, and dried at 70°C for 60 seconds, to thereby form a solid reagent phase layer (resin layer) having an average thickness of 5 ⁇ .
- control line reagent coating liquid was coated over the solid reagent phase layer and kept stationary, and then the surface of the solid reagent phase layer was washed and dried, to thereby form the reagent as a solid phase over the solid reagent phase layer. In this way, a control line thermal transfer member was obtained.
- a labeled antibody thermal transfer member was obtained in the same manner as in Example 1.
- Example 2 In the same manner as in Example 1, a labeled antibody, a test line, and a control line were formed over the paper substrates A to E and an absorption pad was placed, to thereby obtain immunochromatography assays (testing devices 10) A to E of Example 4. Visibility and density were evaluated in the same manner as in Example 1. The results are shown in Table 4a and Tables 4b- 1 and 4b"2.
- Example 5 were obtained in the same manner as in Example 4, except for the operation described just above. Visibility and density were evaluated in the same manner as in Example 1. The results are shown in Table 4a and Tables 4b-l and 4b-2.
- Example 6 Immunochromatography assays (testing devices 10) A to E of Example 6 were obtained in the same manner as in Example 4, except for the operation described just above. Visibility and density were evaluated in the same manner as in Example 1. The results are shown in Table 4a and Tables 4b- 1 and 4b-2.
- An antibody dilution buffer was added to an anti-human IgG antibody such that the antibody would be prepared to be 0.9 mg/mL, to thereby obtain a test line reagent coating liquid.
- An antibody dilution buffer was added to human IgG, such that the human IgG would be prepared to be 0.9 mg/mL, to thereby obtain a control line reagent coating liquid.
- thermoplastic resin which was a polyester-based hot-melt adhesive (ALONMELT PES375S40 manufactured by Toagosei Co., Ltd.), was heated to 190°C, and then with a roll coater, applied over a PET film (LUMIRROR S10 manufactured by Toray Industries, Inc., with an average thickness of 50 ⁇ ) cut into a size of 40 mm in width and 35 mm in length, to have a thickness of 50 ⁇ over the PET film, to thereby form an adhesive layer.
- This applied product was kept stationary for 2 hours or longer.
- each of the materials shown in Table 1 each of which was cut into the same size as the PET film, was overlapped with the adhesive layer-applied surface. Then, a load of 1 kgf/cm 2 was applied to them at 150°C for 10 seconds, to thereby obtain paper substrates A to E.
- Fig. 11A is a top plan view of a testing device of Comparative Example 1.
- FIG. 11B is a cross-sectional diagram of the testing device of Fig. 11A taken along a line ⁇ . Then, with the positive-pressure spray device, the control line reagent coating liquid was applied at a position e that was 5 mm away from the position d, to form a line shape having a width of 0.7 mm. After the application, the coating liquids were dried at 20°C at -20RH% for 16 hours.
- the labeled antibody solution produced in 1-3 was applied in an amount of 60 ⁇ 2 over a glass fiber pad (GFCP 203000 manufactured by Merck Millipore Corporation, p in Fig. 11A and Fig. 11B) cut into a size of 40 mm in width and 18 mm in length, and dried at reduced pressure for one night, to thereby produce a labeled antibody retaining pad.
- GFCP 203000 manufactured by Merck Millipore Corporation
- Each of the paper substrates A to E was bonded to a PET film (LUMIRROR S10 manufactured by Toray Industries, Inc., with an average thickness of 100 ⁇ ), which was a base film cut into a size of 40 mm in width and 80 mm in length, at a position that was 33 mm away from a longer-direction one end of the base film (PET film), such that a surface of the paper substrate opposite to the surface thereof over which the reagents were applied would face the base film (PET film).
- PET film LMIRROR S10 manufactured by Toray Industries, Inc., with an average thickness of 100 ⁇
- the labeled antibody retaining pad produced as above which was cut into a size of 40 mm in width and 18 mm in length, was pasted over the top surface of the paper substrate such that it would overlap with the upstream end of the paper substrate by 2 mm. Further, a sample pad (CFSP 223000 manufactured by Merck Millipore
- Immunochromatography assays A to E of Comparative Example 2 were fabricated in the same manner as in Comparative Example 1, except that the anti-human IgG antibody used for the test line reagent coating liquid in Comparative Example 1 was changed to an anti-hCG
- Comparative Example 1 was changed to the gold colloid-labeled antibody produced in Example 3.
- Examples 1 to 6 color development in lines could be recognized in all of the immunochromatography assays formed of the paper substrates A to E in the evaluation of visibility (Table 4a). Particularly, clear lines could be recognized in A to C. Above all, in Examples 4 to 6, highly visible lines having a uniform color development density all along could be recognized. Further, lines having a high density could be recognized in all of the immunochromatography assays formed of the paper substrates A to E in the evaluation of optical density (Tables 4b- 1 and 4b-2). Above all, in Examples 4 to 6, particularly dense lines of which density was 250 or higher on the reading basis could be recognized.
- a silicone-based rubber emulsion (KS779H manufactured by Shin-Etsu Chemical Co., Ltd., with a solid content of 30% by mass) (16.8 parts by mass), a chloroplatinic acid catalyst (0.2 parts by mass), and toluene (83 parts by mass) were mixed, to thereby obtain a back layer coating liquid.
- a polyethylene wax (POLYWAX 1000 manufactured by Toyo ADL Corporation, with a melting point of 99°C, and a needle penetration of 2 at 25°C) (14 parts by mass), an ethylene/vinyl acetate copolymer (EV-150 manufactured by Du Pont-Mitsui Polychemicals Co., Ltd., with a weight average molecular weig ht of 2,100, and VAc of 21%) (6 parts by mass), toluene (60 parts by mass), and methyl ethyl ketone (20 parts by mass) were dispersed until the average particle diameter became 2.5 ⁇ , to thereby obtain a release layer coating liquid.
- EV-150 ethylene/vinyl acetate copolymer manufactured by Du Pont-Mitsui Polychemicals Co., Ltd., with a weight average molecular weig ht of 2,100
- a polyvinyl butyral resin (BL- 10 manufactured by Sekisui Chemical Co., Ltd., with a butyralation degree of 72mol%) (5 parts by mass), and ethanol (95 parts by mass) were mixed, to thereby obtain a fixing-purpose solid reagent phase layer coating liquid.
- 3,5-di-tert-butyl salicylic acid (149136-5G manufactured by Sigma Aldrich Co., LLC.) (5 parts by mass), sodium hydroxide (306576-25G manufactured by Sigma Aldrich Co., LLC.) (0.8 parts by mass), and distilled water (32 parts by mass) were mixed and stirred sufficiently, to make a 3,5-di-tert-butyl salicylic acid sodium salt aqueous solution, to thereby obtain a sensing line reagent coating liquid.
- the back layer coating liquid was applied to one surface of a support member, which was a PET film (LUMIRROR F57 manufactured by Toray Industries, Inc.) having an average thickness of 4.5 ⁇ , and dried at 80°C for 10 seconds, to thereby form a back layer having an average thickness of 0.02 ⁇ .
- a support member which was a PET film (LUMIRROR F57 manufactured by Toray Industries, Inc.) having an average thickness of 4.5 ⁇ , and dried at 80°C for 10 seconds, to thereby form a back layer having an average thickness of 0.02 ⁇ .
- the release layer coating liquid was applied over a surface of the PET film opposite to the surface over which the back layer was formed, and dried at 50°C for 180 seconds, to thereby form a release layer having an average thickness of 85 ⁇ .
- the fixing-purpose solid reagent phase layer coating liquid was applied over the release layer, and dried at 70°C for 60 seconds, to thereby form a solid reagent phase layer having an average thickness of 5 ⁇ .
- the sensing line reagent coating liquid was applied over the solid reagent phase layer, and dried at 25°C for 5 hours, to thereby form the reagent as a solid phase over the solid reagent phase layer. In this way, a sensing line thermal transfer member was obtained.
- thermoplastic resin which was a polyester-based hot-melt adhesive (ALONMELT PES375S40 manufactured by Toagosei Co., Ltd.), was heated to 190°C, and then with a roll coater, applied over a PET film
- each of the paper substrates A to E was overlapped with a surface of the reagent thermal transfer member over which the reagent was formed as a solid phase. After this, with a thermal transfer printer, the sensing line thermal transfer member was transferred onto the paper substrate at a position that was 30 mm away from an upstream end of the paper substrate to form a line shape having a size of 0.7 mm in width and 4 mm in length, to thereby form a resin layer 15d, as shown in Fig.
- Fig. 12A is a top plan view of a testing device of the
- Example. Fig. 12B is a cross-sectional diagram of the testing device of
- Fig. 12A taken along a line F-F.
- a thermal head having a dot density of 300 dpi manufactured by TDK Corporation was used at a printing speed of 42 mm/sec and at a printing energy of 0.17 mJ/dot, and constructed as an evaluation system for evaluation of the printing.
- test liquid 100 ⁇ was dropped into the upstream end portion of the chemical assays A to E. Ten minutes later, the chemical assays were observed, and determined based on the same evaluation criteria as in Example 1. The evaluation results are shown in Table 6a and Table 6b.
- the sensing line reagent coating liquid was applied over the paper substrates A to E at a position f that was 30 mm away from a longer- direction one end of the paper substrates, to form a line shape having a width of 0.7 mm, as shown in Fig. 13A and Fig. 13B.
- Fig. 13A is a top plan view of a testing device of Comparative Example.
- Fig. 13B is a cross -sectional diagram of the testing device of Fig. 13A taken along a line G"G.
- the coating liquid was dried at 20°C at -20RH% for 16 hours.
- Example 7 color development in lines was recognized in all of the chemical assays formed of the paper substrates A to E in the evaluation of visibility. Further, lines having a high density could be recognized in all of the chemical assays formed of the paper substrates A to E in the evaluation of optical density. On the other hand, in
- Comparative Example 3 although color development in line shapes could be recognized in the paper substrates A to C, bleeding was heavy at the lines and color development could only be recognized narrowly in the paper substrates D and E in the evaluation of visibility. Further, in the evaluation of optical density, although a density of 250 or higher on the reading basis could be observed in the paper substrates A to C, color development was blurred and pale in the paper substrates D and E.
- a testing device including:
- a reagent reactive with the sample is provided as a solid phase over a surface of the resin layer facing the flow path member.
- the testing device including:
- the reagent provided as a solid phase over the first resin layer is a capture antibody
- the reagent provided as a solid phase over the second resin layer is a labeled antibody
- the testing device including:
- the first resin layer contains a resin having a hydrophobic group.
- the resin having a hydrophobic group is a hydrophobic resin or a first amphiphilic resin.
- the second resin layer contains a second amphiphilic resin.
- the resin layer contains a water-insoluble resin.
- the resin layer is a non-porous member.
- a testing kit including:
- the testing device according to any one of ⁇ 1> to ⁇ 9>> * and a sample picking member configured to pick the sample, or a liquid for treating the sample, or both thereof.
- a transfer member for testing device fabrication including:
- a release layer provided over the support member,' and a solid reagent phase layer provided over the release layer, wherein a reagent reactive with a sample is provided as a solid phase over a surface of the solid reagent phase layer.
- a method for fabricating a testing device including:
- a testing method including:
- a testing method including: supplying a sample into the flow path member of the testing device according to any one of ⁇ 1> to ⁇ 9>, and
- test liquid an example of a sample
Abstract
Description
Claims
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EP15755498.1A EP3111219B1 (en) | 2014-02-28 | 2015-02-27 | Testing device, testing kit and testing method |
CN201580023632.2A CN106461650B (en) | 2014-02-28 | 2015-02-27 | Test device, testing cassete, transfer member, test device production method and test method |
US15/121,915 US10473656B2 (en) | 2014-02-28 | 2015-02-27 | Testing device including resin layer, testing kit, transfer member, testing device fabrication method, and testing method |
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JP2015036766A JP6686278B2 (en) | 2014-02-28 | 2015-02-26 | Inspection device, inspection kit, transfer medium, inspection device manufacturing method, and inspection method |
JP2015-036766 | 2015-02-26 |
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JP2017116537A (en) * | 2015-12-18 | 2017-06-29 | 株式会社リコー | Thermal transfer medium for inspection device, inspection device and manufacturing method of the same, and inspection kit |
WO2017188095A1 (en) * | 2016-04-25 | 2017-11-02 | Ricoh Company, Ltd. | Testing device and method for producing same, testing method, and testing kit and transfer medium for producing testing device |
JP2018017701A (en) * | 2016-07-29 | 2018-02-01 | 株式会社リコー | Immuno-chromatography method, inspection system, and transfer medium for manufacturing inspection system, and inspection kit |
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WO2017188095A1 (en) * | 2016-04-25 | 2017-11-02 | Ricoh Company, Ltd. | Testing device and method for producing same, testing method, and testing kit and transfer medium for producing testing device |
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