WO2018235332A1 - 検体検出装置及び検体検出方法 - Google Patents
検体検出装置及び検体検出方法 Download PDFInfo
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- 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
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/6428—Measuring fluorescence of fluorescent products of reactions or of fluorochrome labelled reactive substances, e.g. measuring quenching effects, using measuring "optrodes"
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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
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/645—Specially adapted constructive features of fluorimeters
- G01N21/648—Specially adapted constructive features of fluorimeters using evanescent coupling or surface plasmon coupling for the excitation of fluorescence
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
- B01L3/50—Containers for the purpose of retaining a material to be analysed, e.g. test tubes
- B01L3/508—Containers for the purpose of retaining a material to be analysed, e.g. test tubes rigid containers not provided for above
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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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N21/03—Cuvette constructions
- G01N21/05—Flow-through cuvettes
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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
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/27—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection ; circuits for computing concentration
- G01N21/274—Calibration, base line adjustment, drift correction
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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
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/55—Specular reflectivity
- G01N21/552—Attenuated total reflection
- G01N21/553—Attenuated total reflection and using surface plasmons
- G01N21/554—Attenuated total reflection and using surface plasmons detecting the surface plasmon resonance of nanostructured metals, e.g. localised surface plasmon resonance
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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
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
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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
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/645—Specially adapted constructive features of fluorimeters
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2300/00—Additional constructional details
- B01L2300/06—Auxiliary integrated devices, integrated components
- B01L2300/0627—Sensor or part of a sensor is integrated
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2300/00—Additional constructional details
- B01L2300/06—Auxiliary integrated devices, integrated components
- B01L2300/0681—Filter
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2300/00—Additional constructional details
- B01L2300/08—Geometry, shape and general structure
- B01L2300/0809—Geometry, shape and general structure rectangular shaped
- B01L2300/0819—Microarrays; Biochips
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2300/00—Additional constructional details
- B01L2300/12—Specific details about materials
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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
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/6428—Measuring fluorescence of fluorescent products of reactions or of fluorochrome labelled reactive substances, e.g. measuring quenching effects, using measuring "optrodes"
- G01N2021/6439—Measuring fluorescence of fluorescent products of reactions or of fluorochrome labelled reactive substances, e.g. measuring quenching effects, using measuring "optrodes" with indicators, stains, dyes, tags, labels, marks
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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
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/645—Specially adapted constructive features of fluorimeters
- G01N2021/6463—Optics
- G01N2021/6471—Special filters, filter wheel
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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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N21/13—Moving of cuvettes or solid samples to or from the investigating station
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/12—Circuits of general importance; Signal processing
- G01N2201/127—Calibration; base line adjustment; drift compensation
- G01N2201/12723—Self check capacity; automatic, periodic step of checking
Definitions
- the present invention relates to an analyte detection system and an analyte detection method for detecting a substance to be measured contained in a sensor chip, and more specifically, to an individual difference in an optical system included in an analyte detection device and a fluorescent dye for labeling a substance to be measured
- the present invention relates to an analyte detection system and an analyte detection method capable of detecting a substance to be measured with high accuracy regardless of the type of the object.
- analyte detection method which make it possible to detect such substances by applying the physical phenomenon of the substance when detecting a very small substance.
- an analyte detection method for example, the presence or absence of a substance to be measured or its antigen using an antigen which is a substance to be measured contained in a sample solution and an antibody or antigen labeled with a labeling substance is used.
- Immunoassays immunoassays that measure amounts are known.
- the immunoassay includes enzyme-linked immunosorbent assay (EIA) using an enzyme as a labeling substance, and fluorescence immunoassay (FIA) using a fluorescent substance as a labeling substance.
- EIA enzyme-linked immunosorbent assay
- FIA fluorescence immunoassay
- an analyte detection apparatus using a fluorescence immunoassay method a phenomenon in which high light output is obtained by resonance of electrons and light in a minute area such as nanometer level (Surface Plasmon Resonance (SPR: Surface Plasmon Resonance)
- SPR device A surface plasmon resonance device (hereinafter, also referred to as “SPR device”) adapted to detect a very minute alanite in a living body by applying the phenomenon).
- SPFS surface plasmon excitation-enhanced fluorescence spectroscopy
- SPR surface plasmon resonance
- analyte detection can be performed with higher accuracy than that of the SPR device based on the principle of surface plasmon-field enhanced fluorescence spectroscopy (SPFS)
- SPFS device The surface plasmon excitation enhanced fluorescence spectrometer (hereinafter, also referred to as “SPFS device”) is one of such an analyte detection device.
- a sensor chip including a dielectric member, a metal film adjacent to the top surface of the dielectric member, and a liquid holding member disposed on the top surface of the metal film is used.
- a reaction section having a ligand for capturing an analyte is provided on a metal film.
- the analyte is captured by the ligand by supplying the sample liquid containing the analyte to the liquid holding member (primary reaction).
- a liquid (labeling liquid) containing a secondary antibody labeled with a fluorescent substance is introduced into the liquid holding member.
- the analyte captured by the ligand is labeled with a fluorescent substance by an antigen-antibody reaction (secondary reaction).
- the excitation light wavelength, the incident angle, the immune reaction efficiency, and the like vary for each sample detection apparatus due to the variation or assembly variation of the parts used. There are individual differences among devices.
- the correction coefficient of the device individual difference according to the type of the substance to be measured is stored in advance in the storage means of the sample detection device, and identification information on the type of the substance to be measured is obtained from the sensor chip.
- the device individual difference is corrected by correcting the fluorescence signal obtained by irradiating the sensor chip with the excitation light using the correction coefficient extracted from the storage unit according to the identification information.
- the calibration operation described above generally needs to be performed for each sample detection device (sample detection unit) because individual differences exist in the sample detection device (sample detection unit). For this reason, in a sample detection device using a plurality of sample detection devices in combination or mounting a plurality of sample detection units, calibration work must be performed for each sample detection device or sample detection unit.
- An object of the present invention is to provide an analyte detection apparatus and an analyte detection method.
- An analyte detection apparatus for detecting an analyte based on the intensity of fluorescence emitted from the fluorescent substance by irradiating excitation light to a sensor chip containing the analyte labeled with the fluorescent substance, ,
- An analyte detection unit comprising an excitation light irradiation unit for irradiating the excitation light, and a fluorescence detection unit for detecting the fluorescence;
- a control unit configured to detect the analyte based on a detection value dependent on the intensity of the fluorescence detected by the fluorescence detection unit; The control unit corrects the detection value and calculates a correction detection value using the individual difference information stored in advance based on the individual difference of the sample detection unit and the correction coefficient for each of the sensor chips. Configured as.
- a sample detection method reflecting one aspect of the present invention is A sensor chip including an analyte labeled with a fluorescent substance using an analyte detection unit including an excitation light irradiation unit for irradiating excitation light and a fluorescence detection unit for detecting fluorescence
- an analyte detection unit including an excitation light irradiation unit for irradiating excitation light and a fluorescence detection unit for detecting fluorescence
- the fluorescence emitted from the fluorescent substance is detected by the fluorescence detection unit, and the analyte is detected based on the detected value depending on the intensity of the detected fluorescence.
- Sample detection method to perform A correction detection value is calculated by correcting the detection value using individual difference information acquired in advance based on the individual difference of the sample detection unit and a correction coefficient for each of the sensor chips.
- an individual difference information which differs depending on the optical system of the sample detection apparatus independently of the substance to be measured and a fluorescent substance different depending on the fluorescent substance labeling the substance to be measured independently of the optical system of the sample detection apparatus
- correction values are calculated for each sample detection device based on information and each other's individual differences are reduced
- calibration is performed for each test item (measurement target substance) for all sample detection devices (sample detection units). Since it is not necessary to carry out work and obtain correction values, it is possible to reduce the effort of the user in calibration work.
- sample detection unit sample detection unit
- the correction value is set for each sample detection apparatus only by providing only the fluorescent substance information of the fluorescent substance used in the new test item. Since it is possible to calculate and reduce individual differences between each other, it is not necessary to store the correction value again in the sample detection apparatus, so it is possible to cope with a new examination item without burdening the user.
- FIG. 1 is a schematic view for explaining the configuration of a surface plasmon excitation enhanced fluorescence spectrometer (SPFS device) which is an embodiment of the sample detection device of the present invention.
- FIG. 2 is a schematic view for explaining the configuration of a sample detection unit in the SPFS device of FIG.
- FIG. 3 is a schematic view for explaining the configuration of a sensor chip used in the sample detection unit of FIG.
- FIG. 4 is a flow chart showing an example of the operation procedure of the SPFS device of FIG.
- FIG. 5 is a graph showing an example of absorption spectra of fluorescent substance X and fluorescent substance Y.
- FIG. 6 is a graph showing an example of the emission spectra of the fluorescent substance X and the fluorescent substance Y, and the transmittance with respect to the wavelength of the optical filter.
- FIG. 1 is a schematic view for explaining the configuration of a surface plasmon excitation enhanced fluorescence spectrometer (SPFS device) which is an embodiment of the sample detection device of the present invention
- FIG. 2 is an analyte detection in the SPFS device of FIG.
- FIG. 3 is a schematic view for explaining the configuration of a unit
- FIG. 3 is a schematic view for explaining the configuration of a sensor chip used in the sample detection unit of FIG.
- the SPFS apparatus 10 of this embodiment detects a sample based on the detection values obtained by the plurality of sample detection units 10A, 10B and 10C and the respective sample detection units 10A, 10B and 10C. And an identification information acquisition unit 18 for acquiring information stored in an identification information storage unit 118 provided in a sensor chip 100 described later.
- Each of the sample detection units 10A, 10B, and 10C includes an excitation light irradiation unit 20, a fluorescence detection unit 30, a liquid transfer unit 40, and a transport unit 50, as shown in FIG.
- Each of the sample detection units 10A, 10B, and 10C is used in a state where the sensor chip 100 is mounted on the chip holder 54 of the transport unit 50.
- the sensor chip 100 includes a dielectric member 102 having an incident surface 102a, a film forming surface 102b and an emitting surface 102c, a metal film 104 formed on the film forming surface 102b, and a film forming surface 102b or And a flow path forming member 106 fixed on the metal film 104.
- the sensor chip 100 is replaced for each sample test.
- the sensor chip 100 is preferably a structure having a length of about several mm to several cm on each side, but is a smaller structure or a larger structure that is not included in the category of “chip”. It does not matter.
- the dielectric member 102 can be a prism made of a dielectric that is transparent to the excitation light ⁇ .
- the incident surface 102 a of the dielectric member 102 is a surface on which the excitation light ⁇ emitted from the excitation light irradiation unit 20 is incident on the inside of the dielectric member 102.
- the metal film 104 is formed on the film formation surface 102 b.
- the excitation light ⁇ incident on the inside of the dielectric member 102 is reflected at the interface between the metal film 104 and the film forming surface 102 b of the dielectric member 102 (hereinafter referred to as “the back surface of the metal film 104 for convenience”).
- the excitation light ⁇ is emitted to the outside of the dielectric member 102 through 102 c.
- the shape of the dielectric member 102 is not particularly limited, and the dielectric member 102 shown in FIG. 2 is a prism formed of a hexahedron (truncated square pyramid shape) having a substantially trapezoidal vertical cross section, for example, the vertical
- the cross-sectional shape may be a triangular (so-called triangular prism), semicircular, or semi-elliptical prism.
- the incident surface 102 a is formed so that the excitation light ⁇ does not return to the excitation light irradiation unit 20.
- the light source of the excitation light ⁇ is, for example, a laser diode (hereinafter also referred to as “LD”)
- LD laser diode
- the angle of the incident surface 102a is set so that the excitation light ⁇ does not perpendicularly enter the incident surface 102a in the scanning range centered on the ideal enhancement angle.
- the design of the sensor chip 100 substantially determines the resonance angle (and the enhancement angle in the vicinity of the pole).
- the design elements are the refractive index of the dielectric member 102, the refractive index of the metal film 104, the film thickness of the metal film 104, the extinction coefficient of the metal film 104, the wavelength of the excitation light ⁇ , and the like.
- the analytes immobilized on the metal film 104 shift the resonance angle and the enhancement angle, but the amount is less than a few degrees.
- the dielectric member 102 has some birefringence characteristics.
- the material of the dielectric member 102 includes, for example, various inorganic substances such as glass and ceramics, natural polymers, synthetic polymers, etc., and is a material excellent in chemical stability, manufacturing stability, optical transparency, and low birefringence. Is preferred.
- the material is not particularly limited as described above as long as it is at least formed of a material optically transparent to excitation light ⁇ and low in birefringence.
- it is preferable to be formed of a resin material.
- the method of manufacturing the dielectric member 102 is not particularly limited, but injection molding using a mold is preferable from the viewpoint of manufacturing cost.
- the dielectric member 102 is formed of a resin material, for example, polyolefins such as polyethylene (PE) and polypropylene (PP), cyclic olefin copolymer (COC), polycyclic olefins such as cyclic olefin polymer (COP), polystyrene, Polycarbonate (PC), acrylic resin, triacetyl cellulose (TAC), etc.
- PE polyethylene
- PP polypropylene
- COC cyclic olefin copolymer
- COP cyclic olefin polymer
- PC Polycarbonate
- acrylic resin triacetyl cellulose
- the metal film 104 is formed on the film formation surface 102 b of the dielectric member 102.
- an interaction surface plasmon resonance
- photons of the excitation light ⁇ incident on the film formation surface 102 b under total reflection conditions and free electrons in the metal film 104 and It is possible to generate a light at the place.
- the material of the metal film 104 is not particularly limited as long as it is a metal capable of causing surface plasmon resonance.
- a metal capable of causing surface plasmon resonance.
- Such a metal is suitable as the metal film 104 because it is stable against oxidation and the electric field enhancement by surface plasmon light becomes large.
- the method for forming the metal film 104 is not particularly limited, but, for example, sputtering method, evaporation method (resistance heating evaporation method, electron beam evaporation method, etc.), electrolytic plating, electroless plating method, etc. may be mentioned.
- sputtering method evaporation method (resistance heating evaporation method, electron beam evaporation method, etc.), electrolytic plating, electroless plating method, etc.
- the thickness of the metal film 104 is not particularly limited, but is preferably in the range of 5 to 500 nm, and from the viewpoint of the electric field enhancing effect, more preferably gold, silver, copper, It is preferably in the range of 20 to 70 nm in the case of platinum, 10 to 50 nm in the case of aluminum, and 10 to 70 nm in the case of these alloys.
- the thickness of the metal film 104 is within the above range, surface plasmon light is easily generated, which is preferable. Moreover, if it is the metal film 104 which has such thickness, the magnitude
- a ligand for capturing an analyte is immobilized on the surface of the metal film 104 not facing the dielectric member 102 (hereinafter referred to as “surface of the metal film 104” for convenience). It is done. By immobilizing the ligand, it is possible to selectively detect the analyte.
- the ligand is uniformly immobilized on a predetermined region (reaction field 116) on the metal film 104.
- the type of ligand is not particularly limited as long as it can capture the analyte.
- the ligand is an antibody specific to the analyte or a fragment thereof.
- the flow path forming member 106 is disposed on the film forming surface 102 b of the dielectric member 102 or on the metal film 104 as shown in FIG. 3.
- the flow path forming member 106 is bonded to the dielectric member 102 or the metal film 104 by the adhesive sheet (flow path seal 114) in which the through holes are formed, and the dielectric member 102, the flow path forming member 106, A space surrounded by the flow path seal 114, that is, a through hole of the flow path seal 114 is used as the flow path 112.
- the channel forming member 106 is not limited to this, and for example, a channel groove is formed on the surface facing the film forming surface 102 b or the metal film 104, and the channel forming member 106 is formed on the metal film 104. Is disposed to cover the reaction field 116, the space surrounded by the flow path forming member 106 and the dielectric member 102, that is, the flow path grooves, for sending the sample liquid, the labeling liquid, the cleaning liquid, and the like. It can be used as the flow path 112.
- the flow path forming member 106 may be bonded to the dielectric member 102 or the metal film 104 by, for example, adhesion using an adhesive or a transparent adhesive sheet, laser welding, ultrasonic welding, or pressure bonding using a clamp member. it can.
- the width of the flow path 112 thus formed is preferably 0.1 mm to 5 mm, and the length thereof is preferably 10 mm to 50 mm.
- the height of the flow path 112 in the vicinity of the first through hole 110a is preferably 50 ⁇ m to 500 ⁇ m.
- the flow path forming member 106 has a first through hole 110 a formed at one end of the flow path 112 and a second through hole 110 b formed at the other end of the flow path 112.
- each of the first through holes 110a and the second through holes 110b has a substantially cylindrical shape.
- the first through holes 110a and the second through holes 110b are used as an inlet for injecting a sample solution, a labeling solution, a washing solution and the like into the flow channel 112, and an outlet for taking out a sample solution, a labeling solution, a washing solution and the like. Function.
- the material of the flow path forming member 106 is not particularly limited as long as it is formed of a material optically transparent to at least fluorescence ⁇ described later, but the sensor chip 100 which is inexpensive and excellent in handleability is For provision, for example, it is preferable to be formed of a resin material.
- the method for manufacturing the flow path forming member 106 is not particularly limited, but injection molding using a mold is preferable from the viewpoint of manufacturing cost.
- polyesters such as polyethylene terephthalate (PET), polyethylene naphthalate, polyolefins such as polyethylene (PE), polypropylene (PP), cyclic olefin copolymer (COC), Polycyclic olefins such as cyclic olefin polymer (COP), vinyl resins such as polyvinyl chloride and polyvinylidene chloride, polystyrene, polyetheretherketone (PEEK), polysulfone (PSF), polyethersulfone (PES), polycarbonate (PC), polyamide, polyimide, acrylic resin, triacetyl cellulose (TAC), etc.
- PET polyethylene terephthalate
- PE polyethylene naphthalate
- polyolefins such as polyethylene (PE), polypropylene (PP), cyclic olefin copolymer (COC)
- COC cyclic olefin polymer
- vinyl resins such as polyvinyl chloride
- the identification information storage unit 118 is provided in the sensor chip 100 at a position where the excitation light ⁇ and the fluorescence ⁇ described later are not blocked.
- the identification information storage unit 118 identifies a correction coefficient for each sensor chip 100, such as fluorescent substance information described later such as information for identifying an inspection item or information for identifying a fluorescent substance used in the sensor chip 100. Identification information is stored. For example, a barcode, a two-dimensional code, an RFID (radio frequency identifier), or the like may be used as the identification information storage unit 118, and information on an inspection item or a fluorescent substance can be described as characters.
- the sensor chip 100 configured as described above is mounted on the chip holder 54 of the transport unit 50 of the SPFS apparatus 10 as shown in FIG. 2, and the sample detection is performed by each of the sample detection units 10A, 10B, and 10C.
- the identification information acquisition unit 18 acquires the identification information stored in the identification information storage unit 118 of the sensor chip 100 and causes the control unit 12 to store the identification information.
- the identification information acquisition unit 18 can be appropriately selected according to the mode of the identification information storage unit 118, and can be, for example, a barcode reader, a two-dimensional code reader, an RFID reader, etc. It can also be a keyboard or mouse for direct input.
- each component of each sample detection unit 10A, 10B, 10C will be described based on FIG.
- the sample detectors 10A, 10B, and 10C basically have the same configuration. Therefore, in FIG. 2, only the configuration of the sample detector 10A will be described.
- the specimen detection unit 10A in the present embodiment includes the excitation light irradiation unit 20, the fluorescence detection unit 30, the liquid delivery unit 40, and the transport unit 50.
- the excitation light irradiation unit 20 irradiates the sensor chip 100 held by the chip holder 54 with the excitation light ⁇ . As described later, at the time of measurement of the fluorescence ⁇ , the excitation light irradiation unit 20 directs only the P wave to the metal film 104 to the incident surface 102 a so that the incident angle to the metal film 104 becomes an angle that causes surface plasmon resonance. To emit.
- excitation light is light which excites a fluorescent substance directly or indirectly.
- the excitation light ⁇ generates localized field light on the surface of the metal film 104 that excites the fluorescent substance when the metal film 104 is irradiated at an angle where surface plasmon resonance occurs via the dielectric member 102. It is light.
- the excitation light irradiation unit 20 includes a configuration for emitting the excitation light ⁇ toward the dielectric member 102 and a configuration for scanning the incident angle of the excitation light ⁇ with respect to the back surface of the metal film 104.
- the excitation light irradiation unit 20 includes a light source unit 21, an angle adjustment mechanism 22, and a light source control unit 23.
- the light source unit 21 irradiates excitation light ⁇ which is collimated and has a constant wavelength and light quantity to the back surface of the metal film 104 so that the shape of the irradiation spot becomes substantially circular.
- the light source unit 21 includes, for example, a light source of excitation light ⁇ , a beam shaping optical system, an APC (Automatic Power-Control) mechanism, and a temperature adjustment mechanism (all not shown).
- the type of light source is not particularly limited, and includes, for example, a laser diode (LD), a light emitting diode, a mercury lamp, and other laser light sources.
- LD laser diode
- the light emitted from the light source is converted into a beam by a lens, a mirror, a slit or the like.
- the light emitted from the light source is not monochromatic light
- the light emitted from the light source is converted to monochromatic light by a diffraction grating or the like.
- the light emitted from the light source is not linearly polarized light
- the light emitted from the light source is converted to linearly polarized light by a polarizer or the like.
- the beam shaping optical system includes, for example, a collimator, a band pass filter, a linear polarization filter, a half wave plate, a slit, a zoom unit, and the like.
- the beam shaping optical system may include all of these or may include only a part.
- the collimator collimates the excitation light ⁇ emitted from the light source.
- the band pass filter converts the excitation light ⁇ emitted from the light source into narrow band light of only the central wavelength.
- the excitation light ⁇ from the light source has a slight wavelength distribution width.
- the linear polarizing filter turns the excitation light ⁇ emitted from the light source into light of completely linear polarization.
- the half-wave plate adjusts the polarization direction of the excitation light ⁇ such that the P-wave component is incident on the metal film 104.
- the slit and zoom means adjust the beam diameter, contour shape, etc. of the excitation light ⁇ so that the shape of the irradiation spot on the back surface of the metal film 104 becomes a circle of a predetermined size.
- the APC mechanism controls the light source so that the output of the light source is constant. More specifically, the APC mechanism detects the light quantity of light branched from the excitation light ⁇ by a photodiode or the like (not shown). Then, the APC mechanism controls the output of the light source to a constant level by controlling the input energy with the regression circuit.
- the temperature control mechanism is, for example, a heater or a peltier element.
- the wavelength and energy of the light emitted from the light source may vary with temperature. Therefore, by keeping the temperature of the light source constant by the temperature adjustment mechanism, the wavelength and energy of the light emitted from the light source are controlled to be constant.
- the angle adjustment mechanism 22 adjusts the incident angle of the excitation light ⁇ to the metal film 104. In order to irradiate the excitation light ⁇ at a predetermined incident angle toward a predetermined position of the metal film 104 through the dielectric member 102, the angle adjustment mechanism 22 makes the optical axis of the excitation light ⁇ relative to the chip holder 54. Rotate.
- the angle adjustment mechanism 22 rotates the light source unit 21 about an axis orthogonal to the optical axis of the excitation light ⁇ (an axis perpendicular to the paper surface of FIG. 2).
- the position of the rotation axis is set so that the position of the irradiation spot on the metal film 104 hardly changes even when the incident angle is scanned.
- the irradiation position is set by setting the position of the rotation center near the intersection of the optical axes of the two excitation lights ⁇ at both ends of the scanning range of the incident angle (between the irradiation position on the film forming surface 102b and the incident surface 102a). Can be minimized.
- the angle at which the maximum light quantity of the plasmon scattered light can be obtained is the enhancement angle.
- the basic incident conditions of the excitation light ⁇ are determined by the material and shape of the dielectric member 102 of the sensor chip 100, the film thickness of the metal film 104, the refractive index of the sample liquid in the flow channel 112, etc.
- the optimum incidence conditions slightly fluctuate due to the type and amount of analyte in the flow path 112, the shape error of the dielectric member 102, and the like. For this reason, it is preferable to determine the optimum enhancement angle for each sample test.
- the light source control unit 23 controls various devices included in the light source unit 21 to control the irradiation of the excitation light ⁇ of the light source unit 21.
- the light source control unit 23 is configured by, for example, a known computer or microcomputer including an arithmetic device, a control device, a storage device, an input device, and an output device.
- the fluorescence detection unit 30 detects the fluorescence ⁇ generated from the fluorescent substance excited by the irradiation of the metal film 104 with the excitation light ⁇ . Further, as necessary, the fluorescence detection unit 30 also detects plasmon scattered light generated by the irradiation of the excitation light ⁇ to the metal film 104.
- the fluorescence detection unit 30 includes, for example, a light receiving unit 31, a position switching mechanism 37, and a sensor control unit 38.
- the light receiving unit 31 is disposed in the normal direction (z-axis direction in FIG. 2) of the metal film 104 of the sensor chip 100.
- the light receiving unit 31 includes a first lens 32, an optical filter 33, a second lens 34, and a light receiving sensor 35.
- the first lens 32 is, for example, a condensing lens, and condenses the light generated from the metal film 104.
- the second lens 34 is, for example, an imaging lens, and causes the light collected by the first lens 32 to form an image on the light receiving surface of the light receiving sensor 35.
- the light path between the two lenses 32 and 34 is a substantially parallel light path.
- the optical filter 33 is disposed between the two lenses 32 and 34.
- the optical filter 33 guides only the fluorescence component to the light receiving sensor 35 and removes the excitation light component (plasmon scattered light) in order to detect the fluorescence ⁇ with high S / N.
- the optical filter 33 includes, for example, an excitation light reflection filter, a short wavelength cut filter, and a band pass filter.
- the optical filter 33 is, for example, a filter including a multilayer film that reflects a predetermined light component, but may be a color glass filter that absorbs the predetermined light component.
- the light receiving sensor 35 detects the fluorescence ⁇ .
- the light receiving sensor 35 is not particularly limited as long as it has high sensitivity capable of detecting the weak fluorescence ⁇ from the fluorescent substance labeled with a minute amount of analyte, for example, photoelectron A multiplier tube (PMT), an avalanche photodiode (APD), a low noise folio diode (PD), etc. can be used.
- PMT photoelectron A multiplier tube
- APD avalanche photodiode
- PD low noise folio diode
- the position switching mechanism 37 switches the position of the optical filter 33 to the light path in the light receiving unit 31 or out of the light path. Specifically, when the light receiving sensor 35 detects fluorescence ⁇ , the optical filter 33 is disposed on the optical path of the light receiving unit 31, and when the light receiving sensor 35 detects plasmon scattered light, the optical filter 33 is used as the light receiving unit 31. Arranged outside the light path.
- the position switching mechanism 37 is constituted of, for example, a rotational drive unit and a known mechanism (a turntable, a rack and pinion, etc.) for moving the optical filter 33 in the horizontal direction using rotational movement.
- the sensor control unit 38 controls detection of an output value of the light receiving sensor 35, management of sensitivity of the light receiving sensor 35 based on the detected output value, and control of change of sensitivity of the light receiving sensor 35 for obtaining an appropriate output value.
- the sensor control unit 38 is configured by, for example, a known computer or microcomputer including an arithmetic device, a control device, a storage device, an input device, and an output device.
- the liquid transfer unit 40 supplies a sample solution, a labeling solution, a washing solution, and the like into the flow path 112 of the sensor chip 100 mounted on the chip holder 54.
- the liquid delivery unit 40 includes a syringe pump 41, a pipette nozzle 46, a pipette tip 45 and a liquid feed pump drive mechanism 44.
- the liquid delivery unit 40 is used with the pipette tip 45 attached to the tip of the pipette nozzle 46. If the pipette tip 45 is replaceable, cleaning of the pipette tip 45 becomes unnecessary, and contamination of impurities can be prevented.
- the syringe pump 41 includes a syringe 42 and a plunger 43 capable of reciprocating in the syringe 42.
- the reciprocation of the plunger 43 quantitatively sucks and discharges the liquid.
- the liquid feed pump drive mechanism 44 includes a drive unit of the syringe pump 41 and a moving unit of the pipette nozzle 46 to which the pipette tip 45 is attached.
- the drive device of the syringe pump 41 is a device for reciprocating the plunger 43, and includes, for example, a stepping motor.
- the driving device including the stepping motor can control the amount of liquid delivery and the liquid feeding speed of the syringe pump 41, and thus is preferable from the viewpoint of managing the amount of residual liquid of the sensor chip 100.
- the moving device of the pipette nozzle 46 freely moves, for example, the pipette nozzle 46 in two directions of an axial direction (for example, the vertical direction) of the pipette nozzle 46 and a direction transverse to the axial direction (for example, the horizontal direction).
- the moving device of the pipette nozzle 46 is constituted by, for example, a robot arm, a two-axis stage or a turntable which can move up and down.
- the liquid delivery unit 40 has a tip of the pipette tip 45 It is preferable to further have a mechanism for detecting the position.
- the liquid transfer unit 40 sucks various liquids from a liquid storage unit (not shown) and supplies the liquid into the flow path 112 of the sensor chip 100. At this time, by moving the plunger 43, the liquid reciprocates in the flow path 112 of the sensor chip 100, and the liquid in the flow path 112 is agitated. Thereby, equalization
- the inlet (first through hole 110a) of the sensor chip 100 is protected by the multilayer film 111 or the like, and when the pipette chip 45 penetrates the multilayer film, the first through hole is formed. It is preferable that the sensor chip 100 and the pipette tip 45 be configured to be able to seal the 110 a.
- the second through hole 110b has a lid seal 120 attached to the upper opening thereof, and the second through hole 110b becomes a reservoir portion in which the injected liquid passes through the flow path and is temporarily stored.
- the lid seal 120 has a small hole for air escape.
- the liquid in the flow path 112 is again sucked by the syringe pump 41 and discharged to a waste liquid portion (not shown) or the like.
- a waste liquid portion not shown
- reactions with various liquids, washing, and the like can be performed, and the fluorescent substance-labeled analyte can be immobilized on the reaction site in the flow path 112.
- the transport unit 50 transports and fixes the sensor chip 100 mounted on the chip holder 54 by the user to the liquid delivery position or the measurement position.
- the “liquid transfer position” is a position at which the liquid transfer unit 40 supplies a liquid into the flow path 112 of the sensor chip 100 or removes the liquid in the flow path 112.
- the “measurement position” is a position at which the excitation light irradiation unit 20 irradiates the sensor chip 100 with the excitation light ⁇ and the fluorescence detection unit 30 detects the fluorescence ⁇ generated accordingly.
- the transport unit 50 includes a transport stage 52 and a chip holder 54.
- the chip holder 54 is fixed to the transfer stage 52 and holds the sensor chip 100 in a detachable manner.
- the shape of the chip holder 54 is not particularly limited as long as it can hold the sensor chip 100 and does not interfere with the optical paths of the excitation light ⁇ and the fluorescence ⁇ .
- the chip holder 54 is provided with an opening through which the excitation light ⁇ and the fluorescence ⁇ pass.
- the transfer stage 52 is configured to be able to move the chip holder 54 in one direction (x-axis direction in FIG. 2) and the opposite direction.
- the transfer stage 52 is driven by, for example, a stepping motor.
- the sample detection units 10A, 10B, and 10C configured as described above are connected to the control unit 12.
- the control unit 12 controls the angle adjustment mechanism 22, the light source control unit 23, the position switching mechanism 37, the sensor control unit 38, the transport stage 52, and a detection value depending on the intensity of the fluorescence ⁇ detected by the fluorescence detection unit 30. And detect the analyte, and calculate the amount, concentration, etc. of the analyte as necessary.
- the control unit 12 is configured by, for example, a known computer or microcomputer including an arithmetic device, a control device, a storage device, an input device, and an output device.
- a detection value what quantified the intensity
- the control unit 12 controls each of the sample detection units 10A, 10B, and 10C to detect a sample contained in the sensor chip 100 as described below.
- FIG. 4 is a flowchart showing an example of the operation procedure of the sample detection unit 10A.
- the identification information storage unit 118 of the sensor chip 100 is a barcode
- the identification information acquisition unit 18 is a barcode reader
- the user mounts the sensor chip 100 on the chip holder 54 of the transport unit 50 (S100).
- the control unit 12 operates the identification information acquisition unit 18 to acquire the identification information stored in the identification information storage unit 118 of the sensor chip 100 mounted on the chip holder 54 and stores the identification information in the control unit 12 (S110). .
- control unit 12 operates the transfer stage 52 to move the sensor chip 100 mounted on the chip holder 54 to the liquid transfer position (S120).
- control unit 12 operates the liquid transfer unit 40 to introduce the cleaning liquid stored in the liquid storage unit (not shown) into the flow path 112, cleans the flow path 112, and stores the storage reagent in the flow path 112. It removes (S130).
- the washing liquid used for washing is discharged by the liquid feeding unit 40, and instead, the measurement liquid stored in the liquid storage unit (not shown) is introduced into the flow path 112. If there is no influence on the result of the enhancement angle detection (S150) in the later step, the preservation reagent washing solution and the measuring solution can also be used, and the enhancement angle measurement can be performed without discharging the washing solution.
- control unit 12 operates the transfer stage 52 to transfer the sensor chip 100 mounted on the chip holder 54 to the measurement position (S140). Then, the control unit 12 operates the excitation light irradiation unit 20 and the fluorescence detection unit 30 to irradiate the sensor chip 100 with excitation light ⁇ , and detects and enhances plasmon scattered light of the same wavelength as the excitation light ⁇ . A corner is detected (S150).
- control unit 12 operates the excitation light irradiation unit 20 to scan the incident angle of the excitation light ⁇ with respect to the metal film 104 and operate the fluorescence detection unit 30 to detect plasmon scattered light. At this time, the control unit 12 operates the position switching mechanism 37 to place the optical filter 33 outside the optical path of the light receiving unit 31. Then, the control unit 12 determines the incident angle of the excitation light ⁇ when the light amount of the plasmon scattered light is maximum as the enhancement angle.
- control unit 12 operates the excitation light irradiation unit 20 and the fluorescence detection unit 30 to irradiate the sensor chip 100 disposed at the measurement position with the excitation light ⁇ , and the output value of the light receiving sensor 35 (optical blank value ) Is recorded (S160).
- control unit 12 operates the angle adjustment mechanism 22 to set the incident angle of the excitation light ⁇ to the enhancement angle. Further, the control unit 12 operates the position switching mechanism 37 to arrange the optical filter 33 in the optical path of the light receiving unit 31.
- control unit 12 operates the transfer stage 52 to move the sensor chip 100 to the liquid transfer position (S170). Then, the control unit 12 operates the liquid transfer unit 40 to discharge the measurement liquid in the flow path 112 and introduce the sample liquid stored in the liquid storage portion (not shown) into the flow path 112. In the flow path 112, the analyte is captured at the reaction site on the metal film 104 by the antigen-antibody reaction (primary reaction) (S180).
- the sample liquid used here is a liquid prepared using a sample, and for example, the sample and the reagent are mixed and treated for binding the fluorescent substance to the analyte contained in the sample.
- a sample include blood, serum, plasma, urine, nostril fluid, saliva, stool, body cavity fluid (such as spinal fluid, ascites fluid, pleural fluid) and the like.
- the analyte contained in the sample may be, for example, a nucleic acid (DNA, which may be single-stranded or double-stranded, RNA, polynucleotide, oligonucleotide, PNA (peptide nucleic acid), etc., or nucleoside , Nucleotides and their modified molecules), proteins (polypeptides, oligopeptides etc), amino acids (including modified amino acids), carbohydrates (oligosaccharides, polysaccharides, sugar chains etc), lipids, or modified molecules thereof,
- the complex may, for example, be a carcinoembryonic antigen such as AFP ( ⁇ -fetoprotein), a tumor marker, a signal transduction substance, a hormone or the like without particular limitation.
- the control unit 12 operates the liquid transfer unit 40 to introduce the labeling solution stored in the liquid storage unit (not shown) into the flow path 112.
- the analyte captured on the metal film 104 is labeled with a fluorescent substance by an antigen-antibody reaction (secondary reaction) (S200).
- a fluid containing a secondary antibody labeled with a fluorescent substance can be used as the labeling solution.
- the labeling solution in the flow path 112 is removed, the inside of the flow path 112 is washed with the washing liquid, and after the washing liquid is removed, the measurement liquid is introduced into the flow path 112 (S210).
- control unit 12 operates the transfer stage 52 to move the sensor chip 100 to the measurement position (S220).
- control unit 12 operates the excitation light irradiation unit 20 and the fluorescence detection unit 30 to irradiate the sensor chip 100 disposed at the measurement position with the excitation light ⁇ and label the analyte captured by the ligand.
- the fluorescence ⁇ emitted from the fluorescent substance to be detected is detected (S230).
- the controller 12 can convert the amount and concentration of the analyte, etc., as necessary, based on the detected intensity of the fluorescence ⁇ .
- the control unit 12 generates individual difference information which differs depending on the optical system of the specimen detection units 10A, 10B, and 10C, and fluorescent material information which varies depending on the fluorescent material labeling the analyte, which is a correction coefficient for each sensor chip.
- the intensity (detection value) of the fluorescence ⁇ detected by each of the sample detection units 10A, 10B, and 10C is corrected based on the individual difference correction value. (S240).
- the individual difference information is information obtained when the SPFS device 10 is manufactured, and is stored in advance in the individual difference information storage unit 14 of the control unit 12.
- Information on the wavelength of the excitation light emitted from the excitation light irradiation unit 20 (excitation light wavelength individual difference information such as reference wavelength or excitation light wavelength of each specimen detection unit 10A, 10B, 10C) as individual difference information, light receiving unit
- the information on the wavelength band of the fluorescence passed by the optical filter 33 of 31 reference wavelength and wavelength individual difference information of the optical filter 33 of each of the specimen detection units 10A, 10B, and 10C) is included.
- the individual difference information storage unit 14 of the control unit 12 has individual difference information for each sample detection unit. It is memorized.
- the fluorescent substance information is information that differs depending on the type of fluorescent dye, and the change rate of the absorption coefficient with respect to individual differences in the wavelength of excitation light (for example, how% the absorption coefficient differs when the wavelength shifts by 1 nm), the optical filter 33 The change rate of the amount of fluorescent light with respect to individual differences in the wavelength (for example, how much the detected value differs when the wavelength shifts by 1 nm).
- a plurality of pieces of fluorescent substance information are associated with identification information and stored in advance in the fluorescent substance information storage unit 16 (correction coefficient storage unit) of the control unit 12. Based on the identification information acquired by the identification information acquisition unit 18, the control unit 12 selects, from the fluorescent material information storage unit 16, fluorescent substance information on the fluorescent substance included in the sensor chip 100.
- the fluorescent substance information storage unit 16 only needs to store information for the number of types of fluorescent substances smaller than the number of types of inspection items, so that separate information is stored for each inspection item. There is no need to store such a large amount of information, and means with a small storage capacity can be used. Also, even if a new test item is added, it is not necessary to store additional information if the fluorescent substance used is the same as the already registered fluorescent substance, and it is newly added only when a new fluorescent substance is adopted. It is only necessary to associate new fluorescent substance information with identification information and store it in the fluorescent substance information storage section 16, such as installing the provided fluorescent substance information file in the fluorescent substance information storage section 16.
- the fluorescent substance information may be stored in the identification information storage unit 118 provided in the sensor chip 100, and may be acquired by the identification information acquisition unit 18 for each inspection of the sensor chip 100.
- the method of storing fluorescent substance information in the fluorescent substance information storage unit 16 of the control unit 12 and the method of storing fluorescent substance information in the identification information storage unit 118 of the sensor chip 100 may be used in combination. It is possible.
- the fluorescent substance information corresponding to the identification information is selected from the fluorescent substance information storage unit 16 of the control unit 12 and used for correction.
- the fluorescent substance information can be calibrated to be used for correction.
- the individual difference information storage unit 14 of the control unit 12 information on the wavelength of excitation light is stored as individual difference information.
- the wavelength stored here is a peak wavelength at which the intensity of the excitation light is maximum.
- a reference wavelength ⁇ of excitation light, an excitation light wavelength ⁇ A of the specimen detection unit 10A, an excitation light wavelength ⁇ B of the specimen detection unit 10B, and an excitation light wavelength ⁇ C of the specimen detection unit 10C are stored.
- the excitation light wavelength sensitivity coefficient ⁇ X of the fluorescent substance X and the excitation light wavelength sensitivity coefficient ⁇ Y of the fluorescent substance Y are stored as fluorescent substance information.
- the excitation light wavelength sensitivity coefficient is a value representing how% the detected value differs when the excitation light wavelength shifts by 1 nm.
- the inclination of the absorption spectrum at the reference wavelength ⁇ eg, the reference wavelength ⁇ ⁇ 5 nm is the excitation light wavelength It becomes a sensitivity factor.
- the detection value S is corrected as in the following equation (1).
- n is any one of A, B and C.
- Transmission wavelength range is generally as L s nm ⁇ L l nm, expressed by the two wavelengths of shorter wavelength side wavelength L s and the long wavelength side wavelength L l.
- the transmission band wavelength of the optical filter when the transmission spectrum of the optical filter 33 has the characteristic as shown in FIG. Although defined, for example, a wavelength having an arbitrary transmittance such as a wavelength at which the transmittance is 20% or a wavelength at which the transmittance is 80% may be defined as the transmission band wavelength.
- the short wavelength side wavelength L s of the transmission wavelength band is a region where the fluorescence intensity is high.
- the fluctuation of the value is large. Therefore, by storing a transmission band wavelength corresponding to the short wavelength side wavelength L s of the transmission wavelength band, and corrects the detection value.
- the reference wavelength ⁇ and the transmission band wavelength of each optical filter are stored for both the short wavelength side wavelength L s and the long wavelength side wavelength L 1 of the transmission wavelength band.
- the correction detection value can be calculated more accurately by performing the correction.
- the fluorescent substance information storage unit 16 of the control unit 12 stores the filter wavelength sensitivity coefficient ⁇ X of the fluorescent substance X and the filter wavelength sensitivity coefficient ⁇ Y of the fluorescent substance Y as fluorescent substance information.
- the filter wavelength sensitivity coefficient is a value representing how% the detected value differs when the cut wavelength of the optical filter 33 is shifted by 1 nm.
- the emission spectra of the fluorescent substance X and the fluorescent substance Y and the transmittance for the wavelength of the optical filter 33 have the characteristics as shown in FIG. That is, it is represented by an integral value (area) obtained by multiplying the light emission spectrum by the transmittance of the optical filter 33.
- the transmission band wavelength changes in a range of ⁇ ⁇ 2 nm
- the rate of change of the amount of fluorescence light (the rate of change of the integrated value (area)) of the optical filter 33 is the filter It becomes a wavelength sensitivity coefficient.
- the detection value S is corrected as shown in the following equation (2).
- n is any one of A, B and C.
- the detection value S is corrected as shown in the following formula (3) the detection value S C is calculated.
- the individual difference information of each sample detection unit 10A, 10B, 10C is shown in Table 1 below.
- correction coefficients for each sensor chip are shown in Table 2 below.
- the correction coefficient in the case where the test of the test item 1 is performed in the sample detection unit 10A is 0.979 as described below.
- the correction coefficient is 1.030 when the test item 1 is tested in the sample detection unit 10C, 0.989 when the test item 3 is tested in the sample detection unit 10A, and the sample detection unit 10C is The correction coefficient in the case where the inspection item 3 is inspected in the above is 1.010.
- the fact that the correction coefficients are different in this way means that about 5% of the individual differences of the sample detection units are present for the sample detection unit 10A and the sample detection unit 10C with respect to the test of the same test item 1 It means that you are
- the influence of the individual difference of the specimen detection part is about 2% between the specimen detection part 10A and the specimen detection part 10C, and the examination item (fluorescent substance) is different even in the same sample detection part For example, it means that the influence of the individual difference of the sample detection unit is different.
- the sample detection units are used. It is only necessary to store a total of 12 correction coefficients, i.e., 8 individual difference information and 4 correction coefficients for each sensor chip. Furthermore, as the number of specimen detection units and the number of examination items increase, the present invention can reduce the numerical values to be stored relatively in comparison with the conventional case.
- the enhancement angle detection (S140) and the optical blank value measurement (S150) are performed before the primary reaction (S170), but the enhancement angle detection is performed after the primary reaction (S170).
- the optical blank value measurement (S150) may be performed.
- the detection of the enhancement angle (S140) may be omitted.
- a secondary reaction (S190) in which the analyte is labeled with a fluorescent substance is performed (two-step system).
- the timing at which the analyte is labeled with a fluorescent substance is not particularly limited.
- a labeling solution can be added to the sample solution to label the analyte in advance with a fluorescent substance. Further, by simultaneously injecting the sample solution and the labeling solution into the flow channel 112, the analyte labeled with the fluorescent substance is captured by the ligand. In this case, the analyte is labeled with a fluorescent substance and the analyte is captured by the ligand.
- both the primary reaction and the secondary reaction can be completed by introducing the sample solution into the flow channel 112 (one-step system).
- enhanced angle detection S140 is performed before the antigen-antibody reaction.
- the present invention is not limited to this.
- the detection value is corrected based on the individual difference information and the fluorescent substance information stored in advance in the control unit 12 without providing the identification information acquisition unit.
- the correction detection value may be calculated.
- the sample detection apparatus can be applied to a sample detection apparatus using fluorescence immunoassay (FIA) such as an SPR apparatus, etc.
- FIA fluorescence immunoassay
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Abstract
Description
このような検体検出方法としては、例えば、試料液に含まれる測定対象物質である抗原と、標識物質で標識された抗体または抗原との抗原抗体反応を利用して、測定対象物質の有無やその量を測定する免疫測定法(イムノアッセイ)が知られている。
例えば、蛍光免疫測定法を利用した検体検出装置としては、ナノメートルレベルなどの微細領域中で電子と光が共鳴することにより、高い光出力を得る現象(表面プラズモン共鳴(SPR:Surface Plasmon Resonance)現象)を応用し、例えば、生体内の極微少なアラナイトの検出を行うようにした表面プラズモン共鳴装置(以下、「SPR装置」とも言う)が挙げられる。
また、複数の検体検出ユニットを搭載可能な検体検出装置に対して、検体検出ユニット追加・増設しても、追加した検体検出ユニットに対して改めて較正作業を行う必要がなく、ユーザーあるいは装置組立作業者の作業負担の軽い検体検出装置及び検体検出方法を提供することを目的とする。
蛍光物質で標識されたアナライトを含むセンサーチップに対して、励起光を照射することで、前記蛍光物質から放出される蛍光の強度に基づき、前記アナライトの検出を行う検体検出装置であって、
前記励起光を照射するための励起光照射ユニットと、前記蛍光を検出するための蛍光検出ユニットと、からなる検体検出部と、
前記蛍光検出ユニットにより検出された蛍光の強度に依存する検出値に基づき、前記アナライトの検出を行う制御部と、を備え、
前記制御部は、前記検体検出部の個体差に基づき事前に記憶された個体差情報と、前記センサーチップ毎の補正係数と、を用いて、前記検出値を補正して補正検出値を算出するように構成される。
励起光を照射するための励起光照射ユニットと、蛍光を検出するための蛍光検出ユニットと、からなる検体検出部を用いて、蛍光物質で標識されたアナライトを含むセンサーチップに対して、前記励起光照射ユニットから前記励起光を照射することで、前記蛍光物質から放出される蛍光を前記蛍光検出ユニットにより検出し、検出された蛍光の強度に依存する検出値に基づき、前記アナライトの検出を行う検体検出方法であって、
前記検体検出部の個体差に基づき事前に取得された個体差情報と、前記センサーチップ毎の補正係数と、を用いて、前記検出値を補正して補正検出値を算出する。
図1は、本発明の検体検出装置の一実施例である表面プラズモン励起増強蛍光分光測定装置(SPFS装置)の構成を説明するための模式図、図2は、図1のSPFS装置における検体検出部の構成を説明するための模式図、図3は、図2の検体検出部で用いられるセンサーチップの構成を説明するための模式図である。
制御部12は、識別情報取得部18を操作して、チップホルダー54に装着されたセンサーチップ100の識別情報記憶部118に記憶された識別情報を取得し、制御部12に記憶する(S110)。
次いで、制御部12は、送液ユニット40を操作して、図示しない液貯留部に貯留される洗浄液を流路112内に導入し、流路112を洗浄し、流路112内の保存試薬を除去する(S130)。洗浄に用いられた洗浄液は、送液ユニット40により排出され、代わりに図示しない液貯留部に貯留される測定液を流路112内に導入する。なお、後工程の増強角検出(S150)の結果に影響がなければ、保存試薬洗浄液と測定液を兼用し、洗浄液を排出せずそのまま増強角測定を行うこともできる。
そして制御部12は、送液ユニット40を操作して、流路112内の測定液を排出し、図示しない液貯留部に貯留される試料液を流路112内に導入する。流路112内では、抗原抗体反応(1次反応)によって、金属膜104上の反応場にアナライトが捕捉される(S180)。
このとき、制御部12は、検体検出部10A,10B,10Cの光学系により異なる個体差情報と、センサーチップ毎の補正係数である、アナライトを標識する蛍光物質により異なる蛍光物質情報と、に基づき、検体検出部10A,10B,10C毎の個体差補正値を算出し、各検体検出部10A,10B,10Cにより検出された蛍光γの強度(検出値)を個体差補正値に基づいて補正している(S240)。
制御部12の個体差情報記憶部14には、個体差情報として、励起光の波長に関する情報が記憶されている。ここで記憶されている波長は、励起光の強度が最大となるピーク波長とする。励起光の基準波長λ、検体検出部10Aの励起光波長λA、検体検出部10Bの励起光波長λB、検体検出部10Cの励起光波長λCが記憶されている。
ここで、励起光波長感度係数とは、励起光波長が1nmずれた場合に検出値が何%異なるかを表した値である。
ここで、フィルター波長感度係数とは、光学フィルター33のカット波長が1nmずれた場合に検出値が何%異なるかを表した値である。
以下、より具体的な数値を用いた実施例について説明する。
なお、検査項目を1種類に限定する場合には、識別情報取得部を設けずに、制御部12に事前に記憶されている個体差情報と蛍光物質情報とに基づき、検出値を補正して、補正検出値を算出するようにしてもよい。
10A 検体検出部
10B 検体検出部
10C 検体検出部
12 制御部
14 個体差情報記憶部
16 蛍光物質情報記憶部
18 識別情報取得部
20 励起光照射ユニット
21 光源ユニット
22 角度調整機構
23 光源制御部
30 蛍光検出ユニット
31 受光ユニット
32 第1レンズ
33 光学フィルター
34 第2レンズ
35 受光センサー
37 位置切替機構
38 センサー制御部
40 送液ユニット
41 シリンジポンプ
42 シリンジ
43 プランジャー
44 送液ポンプ駆動機構
45 ピペットチップ
46 ピペットノズル
50 搬送ユニット
52 搬送ステージ
54 チップホルダー
100 センサーチップ
102 誘電体部材
102a 入射面
102b 成膜面
102c 出射面
104 金属膜
106 流路形成部材
110a 貫通孔
110b 貫通孔
111 多層フィルム
112 流路
114 流路シール
116 反応場
118 識別情報記憶部
120 蓋シール
Claims (10)
- 蛍光物質で標識されたアナライトを含むセンサーチップに対して、励起光を照射することで、前記蛍光物質から放出される蛍光の強度に基づき、前記アナライトの検出を行う検体検出装置であって、
前記励起光を照射するための励起光照射ユニットと、前記蛍光を検出するための蛍光検出ユニットと、からなる検体検出部と、
前記蛍光検出ユニットにより検出された蛍光の強度に依存する検出値に基づき、前記アナライトの検出を行う制御部と、を備え、
前記制御部は、前記検体検出部の個体差に基づき事前に記憶された個体差情報と、前記センサーチップ毎の補正係数と、を用いて、前記検出値を補正して補正検出値を算出するように構成される検体検出装置。 - 前記個体差情報は、前記励起光照射ユニットが照射する励起光の波長が含まれる請求項1に記載の検体検出装置。
- 前記蛍光検出ユニットは、光学フィルターを備え、
前記個体差情報は、前記光学フィルターの透過波長帯域情報が含まれる請求項1または2に記載の検体検出装置。 - 前記センサーチップに設けられた識別情報記憶部に記憶される識別情報を取得するための識別情報取得部をさらに備え、
前記制御部は、前記識別情報取得部により取得された識別情報に基づき、前記センサーチップ毎の補正係数を決定する請求項1から3のいずれかに記載の検体検出装置。 - 前記制御部は、前記センサーチップ毎の補正係数が前記識別情報に関連付けられて記憶される補正係数記憶部を備え、
前記制御部は、前記識別情報取得部により取得された識別情報に基づき、前記補正係数記憶部から該当する補正係数を選択するように構成される請求項4に記載の検体検出装置。 - 前記識別情報記憶部に、前記センサーチップ毎の補正係数が記憶され、
前記制御部は、前記識別情報取得部により取得された前記識別情報記憶部に記憶された補正係数を用いて、前記検出値を補正して前記補正検出値を算出するように構成される請求項4または5に記載の検体検出装置。 - 前記センサーチップ毎の補正係数は、前記蛍光物質により異なる蛍光物質情報である請求項1から6のいずれかに記載の検体検出装置。
- 前記検体検出部を複数備え、
前記制御部は、検体検出部毎に前記個体差情報が記憶される請求項1から7のいずれかに記載の検体検出装置。 - 前記センサーチップが、
誘電体部材と、
前記誘電体部材の上面に隣接する金属膜と、
前記金属膜の上面に隣接する反応場と、
前記反応場の上面に配置される液保持部材と、を備え、
前記励起光照射ユニットから、前記金属膜に前記誘電体部材を介して前記励起光を照射するとともに、前記金属膜に照射された前記励起光により、前記反応場に捕捉された蛍光標識された前記アナライトから生じる蛍光を前記蛍光検出ユニットにより検出するように構成する請求項1から8のいずれかに記載の検体検出装置。 - 励起光を照射するための励起光照射ユニットと、蛍光を検出するための蛍光検出ユニットと、からなる検体検出部を用いて、蛍光物質で標識されたアナライトを含むセンサーチップに対して、前記励起光照射ユニットから前記励起光を照射することで、前記蛍光物質から放出される蛍光を前記蛍光検出ユニットにより検出し、検出された蛍光の強度に依存する検出値に基づき、前記アナライトの検出を行う検体検出方法であって、
前記検体検出部の個体差に基づき事前に取得された個体差情報と、前記センサーチップ毎の補正係数と、を用いて、前記検出値を補正して補正検出値を算出する検体検出方法。
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