WO2001069237A1 - Specimen avec capacite de separation de composant solide - Google Patents
Specimen avec capacite de separation de composant solide Download PDFInfo
- Publication number
- WO2001069237A1 WO2001069237A1 PCT/JP2001/002069 JP0102069W WO0169237A1 WO 2001069237 A1 WO2001069237 A1 WO 2001069237A1 JP 0102069 W JP0102069 W JP 0102069W WO 0169237 A1 WO0169237 A1 WO 0169237A1
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- WIPO (PCT)
- Prior art keywords
- reagent
- beads
- component
- reagent layer
- test
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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
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N21/78—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/8483—Investigating reagent band
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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
- G01N33/5002—Partitioning blood components
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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
- G01N33/52—Use of compounds or compositions for colorimetric, spectrophotometric or fluorometric investigation, e.g. use of reagent paper and including single- and multilayer analytical elements
- G01N33/521—Single-layer analytical elements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T436/00—Chemistry: analytical and immunological testing
- Y10T436/25—Chemistry: analytical and immunological testing including sample preparation
- Y10T436/25375—Liberation or purification of sample or separation of material from a sample [e.g., filtering, centrifuging, etc.]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T436/00—Chemistry: analytical and immunological testing
- Y10T436/25—Chemistry: analytical and immunological testing including sample preparation
- Y10T436/25375—Liberation or purification of sample or separation of material from a sample [e.g., filtering, centrifuging, etc.]
- Y10T436/255—Liberation or purification of sample or separation of material from a sample [e.g., filtering, centrifuging, etc.] including use of a solid sorbent, semipermeable membrane, or liquid extraction
Definitions
- the present invention relates to a test strip suitable for detecting a test substance in blood, and mainly belongs to the technical field of chemical analysis of biological material. Background art
- a series of analytical processes such as absorption, diffusion, reaction, and detection of the sample solution are usually required.
- a blood test using blood containing a blood cell component and a plasma component (hereinafter, also referred to as “whole blood”), when detecting and quantifying glucose in a plasma component as a test substance, the blood cell component is used.
- whole blood blood containing a blood cell component and a plasma component
- the blood cell component is used.
- the blood cell component and the plasma component are separated from the whole blood, and the test is performed on the separated plasma component.
- Various proposals have been made for techniques for detecting substances.
- a test device using a specific gravity difference between a blood cell component and a plasma component and having a blood cell separation mechanism by centrifugal separation is known.
- this test device requires a centrifugal separator, which makes the device for detecting the test substance complex and large-scale, and the reagents and the like to be used may be complicated. May not be preferred.
- test strip which separates blood cell components in whole blood and detects a test substance in a plasma component using a coloring reagent which develops a color with respect to the test substance.
- This test piece is superior to the above-described test device in that the test substance can be detected only by spotting whole blood on the test piece.
- test piece examples include an asymmetric membrane, a glass filter, or a blood cell separation layer having a porous structure formed by solidifying polymer particles with an organic polymer;
- a laminated test piece obtained by laminating a reagent layer containing a coloring reagent that develops a color on a test substance on a light-transmissive support for example, Japanese Patent Application Laid-Open No. 49-53888, And the polymer particles are solidified with an organic adhesive or the like to form a layer containing an appropriate particle gap and containing the coloring reagent to separate blood cell components.
- Test pieces for example, Japanese Patent Application Laid-Open No. 57-160063 which attempt to develop plasma components and detect test substances are known.
- the laminated test piece whole blood easily spreads on the blood cell separation layer, and the blood cell component and the plasma component are separated in the vertical direction mainly using their own weight.
- a blood cell layer is formed on the uppermost part of the separation layer. Therefore, for example, when the test substance is quantified by transmitted light measurement, even if the test substance is colored by the coloring reagent, the measurement light is blocked by the blood cell layer, and the transmitted light cannot be measured. There is.
- detection and measurement may be performed while supplying oxygen to the test substance.
- a blood cell layer is easily formed on the blood cell separation layer. Therefore, oxygen permeability is poor, and it is necessary to provide an oxygen supply means such as an oxygen permeable membrane between the reagent layer and the support in order to supply oxygen. It is difficult to provide an oxygen supply means such as an oxygen permeable membrane on the laminated test piece, and it increases the production cost of the test piece.
- a test piece in which a polymer particle is solidified with an organic polymer to form a blood cell separation layer is formed, and the organic polymer absorbs moisture and swells. In some cases, the interparticle gap becomes small, and a sufficient amount of plasma components may not spread to the reagent layer.
- the plasma component is vertically moved by capillary action. It can be deployed not only in the horizontal direction but also in the horizontal direction.
- the blood cell component easily spreads on the reagent layer as in the case of the above-mentioned laminated test piece, deterioration of oxygen permeability due to shading of the blood cell layer and formation of the blood cell layer in transmitted light measurement is as follows. Challenges remain. Also, in this test piece, when the plasma component spreads in the layer, the dye and the like generated by the reaction with the coloring reagent may further develop, and the distribution concentration of the detected test substance may be biased. May occur.
- the present invention has been made in view of the above-mentioned circumstances, and is capable of measuring a test substance by transmitted light measurement, has a high oxygen permeability, and is a test capable of measuring the test substance with higher accuracy.
- the task is to provide pieces.
- the present invention has the following configuration as means for solving the above problems.
- the present invention provides a test piece having a solid component separation ability capable of separating a solid component from a sample containing a solid component and a liquid component and detecting a test substance contained in the liquid component, comprising beads, An inorganic gel, and a reagent layer having a porous structure containing a reagent that causes a detectable reaction with the test substance; and a support for supporting the reagent layer, wherein the beads are adhered to each other by the inorganic gel.
- a test piece characterized in that a particle gap for trapping the solid component is formed between beads.
- the sample is blood (whole blood) containing a blood cell portion and a plasma portion
- the support has a hydrophilic portion on the surface, and the reagent layer is supported by the hydrophilic portion.
- the particle diameter of the beads is 0.5 to 10; zm, and the content of the beads is 1 to 30% by weight in final concentration, and the inorganic gel is formed. It is preferable that the content of the inorganic gelling agent is 0.1 to 3% by weight at the final concentration.
- the reagent reacts with a test substance to cause an optical change, and the support is preferably formed of a light-transmitting substance.
- the test strip of the present invention includes a reagent layer and a support for supporting the reagent layer.
- the reagent layer has a porous structure containing beads, an inorganic gel, and a reagent that causes a detectable reaction with a test substance.
- the beads are adhered to each other by an inorganic gel, and a particle gap is formed between the beads to collect solid components in the sample.
- the beads may be any as long as they can collect solid components in the gap between particles. However, it is preferable that the beads have a narrow particle size distribution in the range of the particle size in separating the solid components. When using beads with a wide particle size distribution or beads with a relatively large particle size, use beads containing particles with a relatively small particle size of 10 ⁇ or less. Is preferred for forming a suitable particle gap.
- the preferred particle size of the beads depends on the size of the solid component to be collected in the particle gap (for example, the blood cell component, etc.). Depending on the use conditions of the beads, beads with a particle size of about 30 m are used. However, it is preferably 0.5 to 10 ⁇ , more preferably 3 to 8 ⁇ m. If the particle size of the beads is smaller than the above range, the liquid component may not be developed smoothly.If the particle size of the beads is larger than the above range, the solid component may not be sufficiently collected. There is.
- the preferred content of beads in the reagent layer depends on the desired development distance of the liquid component and the preferred thickness of the reagent layer, but is preferably 1 to 30% by weight in the final concentration. If the content of the beads is smaller than the above range, the layer thickness of the reagent layer may be insufficient. If the content of the beads is too large, the layer thickness of the reagent layer may be unnecessarily large. There is.
- the beads have a shape closer to a sphere in order to form a good particle gap.
- beads satisfying the above-mentioned conditions can be suitably used regardless of the type of beads.
- examples of such beads include inorganic beads such as glass beads, polymerized beads such as latex beads, and the like.
- polymer beads that can easily control the particle size, particle shape, and particle size distribution in production.
- Such a polymerized bead can be obtained by purchasing a commercial product, and can also be produced according to a conventional method such as a suspension polymerization method or an emulsion polymerization method.
- the inorganic gel is used for bonding the beads to each other to make the reagent layer a porous structure. Things. Inorganic gels are generally less likely to swell when absorbing water than organic gels. For example, when measuring a test substance by transmission light measurement, the cell length (reagent layer thickness) is kept constant. There is an advantage that the particle gap of the reagent layer is easily kept constant during the development of the liquid component.
- the inorganic gelling agent that forms an inorganic gel is generally easy to adsorb a compound having a polar substituent or a dye, it adsorbs the reagent or a reaction product (a dye, etc.) between the reagent and the test substance.
- This method has the advantage that the distribution of the detected test substance is less likely to be biased.
- the inorganic gel when the inorganic gel is a gel exhibiting thixotropic properties, it has excellent fluidity at the time of the inorganic sol, and is solidified (gelled) by standing, so that it is difficult to form a reagent layer on the support. Is preferred.
- the inorganic gel becomes transparent by the addition of water in order to detect a test substance by an optical change.
- the preferred content of the inorganic gelling agent in the reagent layer varies depending on the amount of beads used and the properties (gel forming ability, etc.) of the inorganic gelling agent used, but is preferably 0 at the final concentration. 1-3% by weight. If the content of the inorganic gelling agent is less than the above range, adhesion between beads may be insufficient and a reagent layer may not be formed. If the content of the inorganic gelling agent is too large, excess inorganic The gelling agent may fill the particle gap and adversely affect the development of the liquid component.
- inorganic gelling agent commonly used inorganic gelling agents can be used.
- Rabonite series manufactured by Nippon Silica Kogyo Co., Ltd.
- Lucentite SWN manufactured by SWF
- thixotropic W Kyowa Chemical Industry Co., Ltd.
- Smetaton SA Kunipia (Kunimine Industry Co., Ltd.)
- Multigen Toyojun Mining Co., Ltd.
- the reagent is a compound such as a dye precursor that produces an optically detectable substance such as a dye or a fluorescent dye by an oxidation-reduction reaction, an acid-base reaction, a condensation reaction, a complex formation reaction, or the like, or is electrochemically detected. It can be found widely in oxidized or reduced forms of possible electron mediators or compounds that form complex compounds.
- a reagent that generates an optically detectable substance will be specifically described.
- the dye precursor a compound having a conjugated system such as an aromatic ring is preferable. Couplers and hydrogen donors such as 4-amino-1,2-dihydro-1,5-dimethyl-2-phenyl-3H-pyrazol-3-one (hereinafter abbreviated as "4-AA") Reagents that generate quinone-based dyes by oxidative condensation with the body, dye precursors that generate oxidized chromogenic dyes such as ortho-tolidine and benzidine, and dye precursors that develop color when oxidized, such as the leuco-form of the dye Reagents that generate fluorescent substances when oxidized, luminescent substances such as chemiluminescent substances, reagents that generate dyes by reduction, such as tetrazolium salts, and azo dyes that change in pH Diazonium salts that produce chromogenic substances, reagents for color reaction, reagents for producing
- the hydrogen donor is a compound such as phenol which condenses with 4-AA or 3-methyl-2-benzothiazolinone hydrazone to form a quinone dye in the presence of an oxidizing agent.
- ortho-tolidine and benzidines examples include ortho-tolidine, dianisidine, 3,3 'diaminobenzidine, 3,3', 5,5'-tetramethylbenzidine, and N- (3-snolehop Gpi / re). 1, 3, 3 ', 5, 5'-tetramethylbenzidine and the like.
- the leuco body is a colorless dye precursor that is oxidized to form a dye and develop color.
- the dyes whose oxidized body is oxidized include 2,6-dichloro-4-[(4-hydroxypheninole) imino] —2,5-cyclohexadiene-one, 2,6-dichloro- Mouth-one 4-([3-Chloro-1-4-hydroxyphenyl) imino] — 2,5-cyclohexadiene-one, 7— (getylamino) -13-imimino 8-Methyl-13H-phenoxazine salt , 3- (Jethylamino) -17-amino-5-phenylphenazine salt, 3,7-bis (dimethylamino) phenothiazine-15-dium salt, 1-hydroxy-5-methylphenazine salt, 7-h Droxy 3 H—phenoxazine-13-one-10-oxide; leuco forms include 4,4,1-benzylidenebis (N, N-dimethylaniline) and 4,4′-bis [N-ethyl
- dye precursors that are oxidized to produce color include 4-methoxyphenol, 4-ethoxyphenol, 2-ethoxyphenol, 1- (2-hydroxy-5-methoxyphenol) ethanone, 2- Hydroxy-5-methoxybenzoic acid, 2-hydroxy-5-methoxybenzanoledehyde, 2-hydroxy-5-methoxybenzoate methinole, 4-methoxy-1-2-nitrophenol, 2-Chloro-4-methoxypheno ⁇ ⁇ 4-Hydroxy-3-Methoxybenzaldehyde, 4-Hydroxoxy-3-Methoxybenzoic acid.
- 2,4-diamino-6-hydroxypyrimidine 4,5-diamino-16-hydroxypyrimidine
- 4-amino-2,6-dihydroxypyrimidine '6-hydroxy2,4,5-triaminopyrimidine
- 4,5-diamino2,6-dihydroxypyrimidine 4-amino-6-hydroxy-2-methylpyrimidine
- 4-amino-16-hydroxy-12-methoxypyrimidine and the like 2,4-diamino-6-hydroxypyrimidine, 4,5-diamino-16-hydroxypyrimidine, 4-amino-2,6-dihydroxypyrimidine, '6-hydroxy2,4,5-triaminopyrimidine, 4,5-diamino2,6-dihydroxypyrimidine, 4-amino-6-hydroxy-2-methylpyrimidine, 4-amino-16-hydroxy-12-methoxypyrimidine and the like.
- Examples of the reagents that are oxidized to generate a fluorescent substance include 4-hydroxyphenylacetic acid, (4-hydroxy-13-methoxyphenyl) acetic acid, 3- (4-hydroxyphenyl) propionic acid, and 4-hydroxy ( 2-aminoethyl) phenol, 4-hydroxydroxy N, N, N-trimethylenobenzene metaminium, anoreffaminopalladroxydroxyhydric acid, 4-hydroxydroxyphenethylamine, N- (4-hexyl) Droxifuel) acetanilide, 2,7-dichlorofluorescein acetate, and the like.
- an oxidizing agent such as hydrogen peroxide or an oxidizing enzyme such as peroxidase is preferably used as an oxidizing agent involved in the oxidation reaction.
- the oxidizing agent involved in the oxidation reaction is not limited to these, and various known oxidizing agents and oxidizing enzymes may be used.
- Examples of the luminescent substance such as the chemiluminescent substance include firefly luciferin, firefly luciferin, aequorin, lucigenin derivative, luminol derivative, ataridinium ester, persulfuric acid ester and the like.
- tetrazolium salt examples include 2,3,5-triphenyltetrazolium salt, 2,5-diphenyl-13- (1-naphthyl) -12H-tetrazolium salt, 3,3— [3,3,1 Dimethoxy (1,1,1biphenyl) 1,4,4'-diyl] bis [2- (4-ditophenyl) -1,5-phenyl-1 2H-tetrazolium] salt, 3,3- [3 , 3'-Dimethoxy-1 (1,1, -biphenyl) 1-4,4'Jil] -Bis [2,5-diphenyl2H-tetrazolium] Salt, 2- (4-Feodofenii) 1) 3- (4-Nitrophenyl) 1-5-phenyl 1-2H-tetrazolium salt, 2- (4-hydrophenyl) 1-3- (412-trophenyl) 15- (2,4-disulfophenyl) 1 2 H—te
- Examples of the compound which is reduced to produce a dye include reductants such as 1,1′-dimethyl-1,4,4,1bivilillium salt and 1,1′-dibenzyl-1,4,4,1bivilillium salt.
- reductants such as 1,1′-dimethyl-1,4,4,1bivilillium salt and 1,1′-dibenzyl-1,4,4,1bivilillium salt.
- 7-hydroxy-3H-phenoxazine-13-10-10-oxide and the like are reduced to generate a fluorescent dye.
- nicotinamide adenine dinucleotide NAD
- nicotinamide adenine dinucleotide phosphate or the like is preferably used as a reducing agent involved in the reduction reaction.
- the reducing agent involved in the reduction reaction is not limited to these, and may be various known reducing agents.
- Examples of the compound that develops or changes color due to the change in pH include sulfonephthalein dyes such as Promocresol Nore Green, Bromophenolone Resley, Phenonolerede, Bromopyrogallo monoledo Red, and Pyrogallol Red, Malachite Green, and Rozolic Acid.
- Quinoline dyes such as triphenylmethane dyes, quinaldine red, N- (parahydroxyphenyl) 1-2,6-dichloroparabenzoquinoneimine, 7-hydroxy-3H-phenoxazine-13-one-10-oxide, etc.
- Oxazone dyes coumarin dyes such as 6,7-dihydroxy-14-methylcoumarin, and conductive polymer compounds such as a-line oligomers.
- diazonium salts examples include 2-methoxyl 4-morpholinobenzenediazo-dum salt, which forms an azo dye by coupling with indoxyl, and perobilino .
- 2-methoxyl 4-morpholinobenzenediazo-dum salt forms an azo dye by coupling with indoxyl, and perobilino .
- ⁇ by one Gen coupling 3 for generating a zone-based dye 3 'Jime Tokishibifue two Le - 4, 4' - like Jiazoniumu salts.
- a reagent in this category there is a reagent involved in a reaction for producing a diazodium salt.
- a reagent examples include 4-aminobenzenearsonic acid, which forms a diazodium salt in the presence of nitrite, and N-, which forms an azo-based dye by coupling with 4-aminobenzenearsonic acid or its diazo-dum salt.
- 4-aminobenzenearsonic acid which forms a diazodium salt in the presence of nitrite
- N- which forms an azo-based dye by coupling with 4-aminobenzenearsonic acid or its diazo-dum salt.
- 1-naphthylethylenediamine and the like 2,4-dichloroaniline, N, N-getyl-N, 11-naphthylnaphthylethylenediamineoxalate (Tsuda reagent), which forms azo dyes by force-pressing in the presence of nitrite, may be mentioned. You.
- nitrite may be used.
- Reagents for the color reaction include hydrogen peroxide and 1,4-diaminobenzene for detecting aldehyde, and 2,3-dimethyl-2,3-bis (hydroxyamino) for detecting aldehyde.
- Reagents for the reaction for producing the fluorescent substance include 2-hydroxy-1,2-diphenylethanone for detecting a guanidino compound, orthophthalaldehyde for detecting histamine, and ortho for detecting spermidine.
- Examples include 1,2-diamino-4,5-dimethoxybenzene in the detection of phthalaldehyde and alpha keto acid, but are not limited to these.
- Enzyme substrates that react with the enzyme to produce dyes and fluorescent substances include N-tosyl-1-L-phenylalanine-12-methylacridone, a substrate for chymotrypsin, and L-alanine, a substrate for aminopeptidase.
- the enzyme or enzyme substrate may be chemically bound to, for example, an antibody or a fragment thereof.
- the compound that forms a complex and changes color or discoloration is a compound such as a ligand that forms a complex with a metal ion panion through a coordinate bond zion bond to generate a dye or a fluorescent substance.
- Compounds that form a complex with a metal ion to form a color and discoloration include compounds known as metal indicator metal ionophores and compounds that form a complex with a colored transition metal ion to color.
- ethylenediaminetetraacetic acid, 2,2-biviridine, 1-hydroxy-12- (2-hydroxyphenylenazo) benzene, dibenzo-18-crown-16, dicyclohexynole-18-crown-16 , Cyclic polyamines, elixir [4] arenes, 3- [N, N-bis (carboxymethyl) aminomethyl] 1-1,2-dihydroxyxanthraquinone, 5 ', 5 "-dibu-Lomopyrogallo Noresnorefonephthalein, 2-hydroxy-1- (1-hydroxy-2-naphthinoreazo) -1-6-nitro-1-4-naphthalene sulfonate, 2,6-dichloro-1--4 ' Droxy 3 ', 3 "-Dimethylfuxone-1 5', 5" -Dicanoleponic acid, 3,3,1-bis [N, N-bis (carboxymethyl) aminomethyl] fluorescein,
- compounds that form a colored complex with a monovalent cation include tetrakis [3,5-bis (trifluoromethyl) phenyl] borate salt and tetraphenylphospho-dim salt.
- compounds that form a fluorescent complex with calcium ions and the like include
- tetraphenylarsonium salts that form colored complexes with anions, and the fluorescence intensity decreases when they form a complex with chloride ions, ⁇ -ethoxycarbonylmethyl-6-methoxyquinolinium, boron 8-hydroxy-1- (salicylideneamino) -1,6-naphthalenedisulfonate, which forms a complex with the compound.
- the reagent for the test substance include, for example, when the test substance is glucose, glucose oxidase, peroxidase, 4-—, and ⁇ -methyl-1- ( 2-Hydroxy_3-sulfopropyl) 1,3,5-dimethinorea diphosphate, and when the test substance is cholesterol, cholesterol oxidase, peroxidase, 4- ⁇ , and ⁇ — Methyl- ⁇ — (2-hydroxy If the test substance is lactate, lactate dehydrogenase, NAD +, diaphorase, and tetrazolium uv oleate are used. In the case where the test substance is alkaline phosphatase, examples thereof include p-two-mouth phenyl phosphate.
- Electrochemically detectable reagents include, for example, oxidized or reduced forms of electron mediators, and ligands that form complex compounds by ionic or coordinate bonding to specific ions. No. ⁇
- An electron mediator is a chemical substance that oxidizes or reduces a test substance with an enzyme or the like and, at that time, directly or indirectly accepts or gives an electron from or to the test substance.
- the test substance can be quantified from the electrochemical response when the reduced or oxidized form of the electron transfer substance is oxidized or reduced at the electrode.
- the electron mediator include 1,1,1-dimethyl-4,4'-bibiridylium salt, 1,1'-dibenzyl-4,4'-bibiridylium salt, 1,4-di-minobenzene, and 2-methyl- 1,4-naphthoquinone, N-methylphenazine salt, 1-hydroxy-5-methylphenazine salt, 1-methoxy-5-methylphenazine salt, 9-dimethylaminobenzoalphaphenoxazine 7-dium salt, phenoctene derivative, hexacyanoiron (II) salt, 7-hydroxy-3H-phenoxazine-13-one-10-oxide, 3,7-diamino-5-phenylphenazidinium salt, 3 — (Jethylamino) 1-7-amino-5-feyulfene nadinium salt, 1,4-benzenediolone, 1,4-dihydroxy-1,2,3,5-trimethylbenzene,
- ligands that form complexes with anions include tetraphenylarsonium salts and 6-methoxy N- (3-sulfopropyl) quinolinium salts.
- the reagent contained in the reagent layer has been specifically described above.
- the reagent layer also has a solid component separation ability of the reagent layer, a test substance and a reagent. Additives ordinarily used may be added as long as the reaction is not inhibited.
- a suitable additive to be used in such a case is, for example, a buffer prepared from bis-tris buffer (bis. (2-hydroxyxethyl) imino tris (hydroxymethyl) methane and hydrochloric acid. ), A buffer such as a phosphate buffer, a citrate buffer, a ⁇ - (2-acetamido) iminodiacetic acid buffer, and a neutral salt such as sodium chloride.
- a support made of a light-transmitting substance is used as the support, and as an additive, a powder of titanium oxide or the like that enhances the reflection efficiency of the measurement light by reflecting or scattering the measurement light is exemplified. be able to.
- Surfactants can also be used as additives to enhance the development of liquid components.
- examples of such a surfactant include sugar alkyl ethers such as n-octyl-1-D-darcopyranoside, ⁇ -octyl- ⁇ -D-thioglucopyranoside, ⁇ -heptyl-1- ⁇ -D-thiodarcoviranoside, and the like.
- Sugar ester N, N-bis (3-D-dalconamide propyl) deoxycolamide, and the like.
- the layer thickness of the reagent layer affects the developing distance of the liquid component, and as the layer thickness increases, the developing distance of the liquid component also increases, and as the layer thickness decreases, the developing distance of the liquid component tends to decrease.
- the preferred layer thickness of the reagent layer depends on the desired development distance of the liquid component, but is preferably 5 to 130 ⁇ , more preferably 30 to 100 ⁇ , and More preferably, it is 50 to 90 ⁇ m. If the thickness of the reagent layer is smaller than the above range, the liquid component may not be sufficiently developed, which may hinder accurate detection and measurement of the test substance, and the thickness of the reagent layer is larger than the above range. Too much may require a large amount of sample to detect the analyte.
- the shape and material of the support are not particularly limited as long as the support can support the reagent layer. However, it is preferable that the support has a hydrophilic portion on its surface and the hydrophilic portion supports the reagent layer. It is considered that the reason for this is that the hydrophilic portion greatly affects the development of the liquid component after the sample is spotted on the reagent layer.
- the liquid component develops in the reagent layer by developing in the vertical direction due to its own weight, and developing in the vertical and horizontal directions by a capillary action.
- the hydrophilic portion has good affinity with water and weakens the surface tension of the water-soluble liquid component. Therefore, it is considered that the hydrophilic portion acts on the liquid component in the reagent layer so as to flow in the lateral direction, and the liquid component develops obliquely downward by the action of the hydrophilic portion.
- the action in the lateral direction by the hydrophilic portion has a large area of action and works only in the lateral direction, It is considered that this greatly contributes to the development of the liquid component in the lateral direction as compared to the above-mentioned kyaryrical action. For this reason, when a test substance in whole blood is measured by transmitted light measurement or the like, the test substance is measured at a position more distant in the lateral direction of the reagent layer than at a portion where blood cell components adhere to the detection of the test substance. A test substance can be detected, which is more preferable for performing transmitted light measurement.
- the support preferably has a hydrophilic portion and a hydrophobic portion, and the hydrophilic portion has an appropriate shape (for example, a square shape, a square shape, a circular shape, an oval shape, or a shape formed by combining these shapes). Etc.) is preferable because the size of the reagent layer can be made appropriate.
- the support having a hydrophilic portion and a hydrophobic portion may be produced by subjecting a hydrophilic material to a hydrophobic treatment, for example, by applying a hydrophobic substance such as silicon or oil to a hydrophilic material, Alternatively, it may be produced by subjecting a hydrophobic material to a hydrophilic treatment.
- the support is made of a light-transmitting substance, because measurement of transmitted light becomes possible when the test substance is detected by optical change.
- the light transmissive substance include an inorganic compound such as glass and an organic polymer compound such as transparent plastic.
- organic polymer compounds such as transparent plastics can be hydrophilized by ultraviolet irradiation, silanol treatment, etc., even if they are hydrophobic polymers.
- Transparent plastic can be suitably used as a support.
- organic polymer compound include polyolefin resins such as polyethylene, polypropylene, and polyphenylene ethylene, and easily available organic high molecular compounds such as polystyrene and polyethylene terephthalate.
- the test piece of the present invention comprises an inorganic sol (colloid solution in which an inorganic gelling agent is dispersed) in which the reagent is uniformly dispersed or dissolved and the beads are uniformly dispersed, on the support. It can be manufactured by forming a layered structure.
- the beads may be dispersed in an inorganic sol, or an inorganic gelling agent powder and beads are preliminarily mixed, and water or the reagent is uniformly dispersed or dissolved in the mixed powder. It may be dispersed in the inorganic sol by adding a medium.
- the reagent includes The reagent may be uniformly dispersed or dissolved in the mechanical sol, or may be uniformly dispersed or dissolved in an aqueous dispersion medium before the addition of the inorganic gelling agent.
- the layer formation of the inorganic sol on the support can also be performed by a commonly used method.
- the layer can be formed by applying a uniform and predetermined layer thickness with a doctor knife or the like. Good, but if a hydrophilic part patterned in a predetermined shape is provided on the support and an appropriate amount of inorganic sol according to the area of the hydrophilic part is supplied to the hydrophilic part, the inorganic sol spreads on the hydrophilic part, and a uniform layer is formed. It is preferable because a thick reagent layer can be formed on the support.
- the reagent layer can be formed by removing water from the inorganic sol supplied on the support to such an extent that the properties of the inorganic gel for bonding the beads are not impaired.
- the removal of water from the inorganic sol may be carried out by drying under conditions that prevent denaturation of the reagent and do not affect the detection result of the test substance, and drying conditions vary depending on the type of reagent used, etc. For example, drying at 25 ° C, drying at 40 to 50 ° C, drying under reduced pressure, drying under low temperature conditions (for example, around 5 ° C), or a combination thereof And drying under the same conditions.
- drying under low-temperature conditions for example, around 5 ° C
- the test strip of the present invention spots a sample containing at least a test substance in a liquid component at an appropriate position on the reagent layer, and detects a reaction between the test substance and the reagent developed in the reagent layer. As a result, the test substance can be detected.
- the test sample of the present invention may be a sample containing only a liquid component that does not contain a solid component, but the test sample of the present invention separates a solid component from a sample to obtain a liquid component. Since it has a solid component separation ability capable of detecting a test substance, it is more preferably used for analysis of a sample containing a solid component and a liquid component. Examples of such a sample include, as described above, blood (whole blood) containing a blood cell component as a solid component and a plasma component as a liquid component.
- the test strip of the present invention can be used not only for whole blood but also for biological materials such as urine (biological samples), foods, medicines, trace substances existing in the natural environment, industrial chemical substances, and trace amounts in waste. It can be used for analysis of substances.
- whole blood is used as a sample
- the state of the test strip of the present invention during sample analysis will be described.
- the reagent layer in the test strip of the present invention has a porous structure formed by the beads, the inorganic gel, and the reagent, the whole blood is spotted on the reagent layer to form a reagent layer on the reagent layer.
- the blood cell component remains, and the plasma component spreads laterally from the spotted portion in the reagent layer.
- the reagent layer contains an inorganic gel, whole blood spotted on the reagent layer does not easily spread on the reagent layer, and blood cell components do not easily spread on the reagent layer.
- the test substance in the plasma component can be detected at a position on the reagent layer that spreads laterally from the portion where the blood cell component adheres, and the measurement light is not blocked by the blood cell component. Can be measured by transmitted light measurement.
- the blood cell layer is not easily formed on the reagent layer because the blood cell component is unlikely to spread on the reagent layer, and the reagent layer is excellent in oxygen permeability because it has a porous structure. In the reagent layer, the blood cell component is unlikely to spread on the reagent layer, and the plasma component also spreads in the reagent layer in the horizontal direction. Substances can be detected.
- the beads in the reagent layer are bonded to each other by the inorganic gel to form a porous structure, the reagents in the reagent layer and the reaction products of the reagent and the test substance are easily adsorbed by the inorganic gel. Further development of the reagents and reaction products is suppressed, and the distribution concentration in these reagent layers is easily kept constant. Therefore, more accurate measurement of the test substance can be performed.
- the test substance in the present invention is not particularly limited as long as it is present in the liquid component and can be detected by the reagent.
- Examples of the test substance when the specimen is a biological sample include glucose and cholesterol. , Lactic acid, alkaline phosphatase and the like.
- the liquid component may be water-soluble or non-water-soluble, but is generally water-soluble in many cases, and is preferably water-soluble in the present invention.
- the method for detecting the test substance is not particularly limited as long as it can detect the reaction between the reagent and the test substance.
- the method is caused by the reaction between the reagent and the test substance.
- a method of detecting a test substance from an electrochemical change caused by the reaction can be exemplified.
- these methods for detecting a test substance when reagents that react quantitatively with the test substance are used as the reagent, not only the test substance is detected, but also optical changes, electrochemical changes, etc. are measured. Thus, the test substance can be quantified.
- a support made of a light-transmitting substance is used, and the test substance is detected by measuring the optical change by, for example, measuring a transmitted light or a reflected light. Can be detected.
- the optical change can generally be exemplified by a color-forming reaction due to a reaction between a test substance and the above-mentioned reagent.
- the measurement of the optical change using a generally used absorptiometer or a fluorometer, Raman spectroscopy, or the like can be applied.
- Examples of the method for detecting a test substance from the electrochemical change include a method using an oxidation-reduction reaction, and a method using a complex compound generated from this ion when the test substance is an ion.
- a commonly used electrode such as a carbon electrode
- an oxidized or reduced form of the reagent generated by an oxidation-reduction reaction with a test substance is used as the electrode.
- the method is to reduce or oxidize at a potential within the measurable range (normally 1.1 V to 111.0 V for carbon electrodes) and measure the potential at this time to quantify the test substance.
- a potential within the measurable range normally 1.1 V to 111.0 V for carbon electrodes
- the oxidation-reduction reaction may be a reaction in which a test substance and a reagent directly transfer electrons, or a reaction in which electrons are transferred indirectly.
- a liquid membrane electrode having a porous polymer layer or the like provided on the surface of the electrode is used, and the liquid membrane electrode is impregnated with the reagent, and the reagent is coated.
- a test substance is selectively bound to a test substance by a coordination bond or an ionic bond, moves in a polymer layer, and a membrane potential generated at that time is measured to determine the test substance.
- FIG. 1 is a diagram showing a test piece manufactured in Example 1 of the present invention.
- FIG. 2 is a diagram showing a state where 1 ⁇ L of whole blood is spotted on the reagent layer of the test piece of FIG.
- FIG. 3 is a diagram showing a state in which 0.5 ⁇ L of whole blood is spotted on the reagent layer of the test piece of FIG.
- FIG. 4 is a diagram showing a state in which 0.1 ⁇ L of whole blood is spotted on the reagent layer of the test piece of FIG. BEST MODE FOR CARRYING OUT THE INVENTION
- Example 1 a test piece using blood (whole blood) as a specimen and glucose (Glc) in the blood as a test substance will be described as an example of the present invention.
- a test piece using blood (whole blood) as a specimen and glucose (Glc) in the blood as a test substance will be described as an example of the present invention.
- distilled water produced by a pure water production apparatus Autostill WG 220 (manufactured by Yamato Scientific Co., Ltd.) is treated by a treatment apparatus Milli—QL abo (manufactured by Nippon Millipore). Milli-Q water was used.
- the transparent polystyrene plate is washed with ethanol and 1 mm Q water, dried, and then irradiated with ultraviolet light (PL 16-110, light source: low-pressure mercury lamp 110 W, both manufactured by Sen Special Light Source). UV light was applied for 1 to 30 minutes (preferably 3 minutes), and the surface of the transparent polystyrene plate was subjected to a hydrophilic treatment to obtain a support 1.
- the shape of the hydrophilic portion of the support 1 was a honey-tan type in which two circles having a diameter of 5 mm were connected.
- Inorganic gelling agents Rabonite X LG, bis-tris buffer (pH 6.5), POD (phenolic oxidase), GOD (gunolecosoxidase), 4-AA (4-aminoantipyrine) 4-amino-1,2-dihydro-1,5-dimethyl-2-phenyl-3H-virazol-3-one)), TOO S (N-ethyl-N- (2-hydroxy-1-3-sulfo) Propyl) -13-methylaline) and latex bead OTG-2 (average particle size: 4.5 ⁇ ) were added to the final concentrations shown in Table 1 below. The mixture was mixed with Milli-Q water to obtain a colloid solution (sol) of Rabonite XLG.
- sol colloid solution
- the inorganic sol obtained by the above operation was spotted on the hydrophilic portion of the support 1 obtained by the above operation by 10 ⁇ L, and dried at 4 ° C. for 1 hour, as shown in FIG. Reagent layer 2 was prepared.
- Fresh whole blood (fingertip blood) was spotted at 1, 0.5, 0.1 / L on the tip of the hyotan type in the reagent layer 2 of each test piece.
- Figures 2 to 4 show the appearance of the test piece when whole blood was spotted.
- the part wetted by the plasma component is colored light red, and can be confirmed visually. This is primarily due to color development of the TOO S (X ma 5 5 5 nm).
- glucose in plasma components can be detected by spotting a very small amount of whole blood. Further, the test piece of the present example can be easily manufactured as described above.
- the amount of Rabonite XLG and other reagents used was fixed, and the amount of beads used was changed according to Table 2 below. Prepared. Then, the expected thickness of the reagent layer was measured. Note that the expected film thickness is a film thickness ( ⁇ ) obtained by observing and calculating fragments of the reagent layer by SEM.
- the moving distance is the distance (mm) from the point at which the separated plasma component moved to the head at 5 seconds after the whole blood was spotted.
- test pieces were prepared in the same manner as in Example 1 described above using each reagent so that the final concentrations described in Table 3 below were obtained. Then, in the same manner as in Example 2 described above, the expected film thickness of the reagent layer in each test piece was measured, whole blood was spotted on the reagent layer, and the moving distance of the plasma component at this time was measured. Table 3 shows the reagent formulation for each test piece, and Table 4 shows the measured results of the expected film thickness and the moving distance.
- the plasma component migration distance depends on the amount of beads used, i.e., the thickness of the reagent layer, if the pH is constant even if the amount of reagent used is slightly changed.
- Example 5 a test piece was prepared in the same manner as in Example 1 described above using each reagent so that the final concentration described in Table 5 below was obtained.
- “beads having different particle diameters” 4.5111 and 6.6111
- Table 5 shows the reagent formulation for each test piece
- Table 6 shows the measured results of the expected film thickness and the moving distance.
- Example 1 was the same as in Example 1 except that HPC-M (hydroxyshethyl propylcellulose: a product of Shin-Etsu Chemical Co., Ltd.), a kind of organic gelling agent, was used in place of Laponite XLG at a final concentration of 2% by weight. Similarly, a reagent layer and a test piece were prepared. Fresh whole blood (fingertip blood) was spotted on the reagent layer of the obtained test piece, but the plasma component did not penetrate into the reagent layer, and the spotted whole blood could not be separated.
- HPC-M hydroxyshethyl propylcellulose: a product of Shin-Etsu Chemical Co., Ltd.
- a kind of organic gelling agent was used in place of Laponite XLG at a final concentration of 2% by weight.
- a reagent layer and a test piece were prepared. Fresh whole blood (fingertip blood) was spotted on the reagent layer of the obtained test piece, but the plasma component did not penetrate
- the solid component in detecting a test substance from a sample composed of a solid component and a liquid component and containing the test substance in the liquid component, the solid component is formed by the beads and the inorganic gel and collected.
- the test substance is also measured by transmitted light measurement c which can be can, good oxygen permeability, and provides a test strip 'capable of measuring analyte at a higher accuracy
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE60138610T DE60138610D1 (de) | 2000-03-15 | 2001-03-15 | Teststreifen mit poröser Filterschicht |
EP01912407A EP1271143B1 (en) | 2000-03-15 | 2001-03-15 | Test strip having a porous filter layer |
US10/221,644 US7201871B2 (en) | 2000-03-15 | 2001-03-15 | Specimen having capability of separating solid component |
AT01912407T ATE430931T1 (de) | 2000-03-15 | 2001-03-15 | Teststreifen mit poröser filterschicht |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2000072545A JP4474010B2 (ja) | 2000-03-15 | 2000-03-15 | 固体成分分離能を有する試験片 |
JP2000-72545 | 2000-03-15 |
Publications (1)
Publication Number | Publication Date |
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WO2001069237A1 true WO2001069237A1 (fr) | 2001-09-20 |
Family
ID=18590932
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2001/002069 WO2001069237A1 (fr) | 2000-03-15 | 2001-03-15 | Specimen avec capacite de separation de composant solide |
Country Status (7)
Country | Link |
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US (1) | US7201871B2 (ja) |
EP (1) | EP1271143B1 (ja) |
JP (1) | JP4474010B2 (ja) |
CN (1) | CN1227531C (ja) |
AT (1) | ATE430931T1 (ja) |
DE (1) | DE60138610D1 (ja) |
WO (1) | WO2001069237A1 (ja) |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
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DE60314990T2 (de) * | 2002-01-31 | 2008-04-30 | Arkray, Inc. | Verfahren zur quantifizierung von glykosyliertem protein unter verwendung einer redoxreaktion sowie eines quantifizierungskits |
WO2003100400A1 (fr) * | 2002-05-27 | 2003-12-04 | Hitachi High-Technologies Corporation | Procede de pre-test de microparticules, procede de detection de microparticules et instrument de detection de microparticules |
JP2006058093A (ja) * | 2004-08-18 | 2006-03-02 | National Institute For Materials Science | 血液分析装置 |
US7418032B2 (en) * | 2005-03-15 | 2008-08-26 | International Business Machines Corporation | Altering power consumption in communication links based on measured noise |
US20090007947A1 (en) * | 2006-12-22 | 2009-01-08 | Angela Spangenberg | Portable weather shielding canopy |
US7838256B2 (en) * | 2007-02-23 | 2010-11-23 | Board Of Regents Of The University Of Nebraska | Assay and kit for drug efflux transporter activity |
EP2263797B1 (de) * | 2007-06-25 | 2011-09-07 | ibidi GmbH | Probenkammer |
CN102077091B (zh) * | 2008-06-30 | 2016-08-17 | 积水医疗株式会社 | 用于结合测定的多孔性固相和使用所述多孔性固相的结合测定法 |
US8668874B2 (en) * | 2009-06-05 | 2014-03-11 | Arizona Board Of Regents For And On Behalf Of Arizona State University | Integrated optoelectrochemical sensor for nitrogen oxides in gaseous samples |
WO2011144652A2 (en) * | 2010-05-18 | 2011-11-24 | Delta Dansk Elektronik, Lys & Akustik | Method for depositing sensor material on a substrate |
FR3034686B1 (fr) * | 2015-04-13 | 2019-06-14 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | Procede pour greffer un indicateur colore sur un support solide et kit de mise en œuvre |
JP6815335B2 (ja) * | 2016-02-04 | 2021-01-20 | テルモ株式会社 | 血糖値測定試薬、血糖値測定チップ、及び血糖値測定装置セット |
CN110006881B (zh) * | 2019-04-01 | 2020-09-11 | 深圳大学 | 尿液中碘含量的检测试剂盒及尿液中碘含量的检测方法 |
DE102019205714A1 (de) * | 2019-04-18 | 2020-10-22 | Mahle International Gmbh | Thermoelektrische flexible Matte |
CN111175292A (zh) * | 2020-01-20 | 2020-05-19 | 杭州联晟生物科技有限公司 | 一种检测乳酸的试纸条及其制备方法 |
CN114184693B (zh) * | 2021-10-14 | 2023-10-13 | 重庆医科大学 | 4-羟苯乙酸作为标志物在制备脓毒症脑病的诊断试剂盒中的应用 |
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- 2000-03-15 JP JP2000072545A patent/JP4474010B2/ja not_active Expired - Fee Related
-
2001
- 2001-03-15 WO PCT/JP2001/002069 patent/WO2001069237A1/ja active Application Filing
- 2001-03-15 CN CNB018095526A patent/CN1227531C/zh not_active Expired - Lifetime
- 2001-03-15 US US10/221,644 patent/US7201871B2/en not_active Expired - Lifetime
- 2001-03-15 AT AT01912407T patent/ATE430931T1/de not_active IP Right Cessation
- 2001-03-15 EP EP01912407A patent/EP1271143B1/en not_active Expired - Lifetime
- 2001-03-15 DE DE60138610T patent/DE60138610D1/de not_active Expired - Lifetime
Patent Citations (6)
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GB1440464A (en) * | 1972-06-30 | 1976-06-23 | Eastman Kodak Co | Multilayer analytical elements |
US4069017A (en) * | 1977-01-14 | 1978-01-17 | Eastman Kodak Company | Colorimetric assay for bilirubin |
EP0013156A1 (en) * | 1978-12-27 | 1980-07-09 | EASTMAN KODAK COMPANY (a New Jersey corporation) | Particulate structure and element for analysis or transport of a liquid and method of making said element |
JPH0954087A (ja) * | 1995-08-10 | 1997-02-25 | Kdk Corp | ヘモグロビン▲A1c▼測定用乾式試験具 |
JPH0989888A (ja) * | 1995-09-19 | 1997-04-04 | Kdk Corp | 全血対応分析要素 |
JP2000065826A (ja) * | 1998-08-21 | 2000-03-03 | Fuji Photo Film Co Ltd | 血液濾過器具及び全血用乾式分析要素 |
Also Published As
Publication number | Publication date |
---|---|
US7201871B2 (en) | 2007-04-10 |
JP4474010B2 (ja) | 2010-06-02 |
EP1271143A4 (en) | 2007-04-18 |
CN1429339A (zh) | 2003-07-09 |
DE60138610D1 (de) | 2009-06-18 |
ATE430931T1 (de) | 2009-05-15 |
EP1271143B1 (en) | 2009-05-06 |
EP1271143A1 (en) | 2003-01-02 |
US20030044316A1 (en) | 2003-03-06 |
JP2001264315A (ja) | 2001-09-26 |
CN1227531C (zh) | 2005-11-16 |
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