US20170010260A1 - Analysis device and analysis method - Google Patents

Analysis device and analysis method Download PDF

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Publication number
US20170010260A1
US20170010260A1 US15/271,328 US201615271328A US2017010260A1 US 20170010260 A1 US20170010260 A1 US 20170010260A1 US 201615271328 A US201615271328 A US 201615271328A US 2017010260 A1 US2017010260 A1 US 2017010260A1
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Prior art keywords
pulse
reference value
pulse width
substrate
detection signal
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US15/271,328
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Inventor
Masayuki Ono
Shingo Yagyu
Makoto Itonaga
Yuichi Hasegawa
Koji Tsujita
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JVCKenwood Corp
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JVCKenwood Corp
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Assigned to JVC Kenwood Corporation reassignment JVC Kenwood Corporation ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: YAGYU, SHINGO, ITONAGA, MAKOTO, ONO, MASAYUKI, TSUJITA, KOJI, HASEGAWA, YUICHI
Publication of US20170010260A1 publication Critical patent/US20170010260A1/en
Priority to US16/412,807 priority Critical patent/US10627398B2/en
Abandoned legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
    • G01N33/543—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals
    • G01N33/54366—Apparatus specially adapted for solid-phase testing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/06—Investigating concentration of particle suspensions
    • G01N15/0606—Investigating concentration of particle suspensions by collecting particles on a support
    • G01N15/0612—Optical scan of the deposits
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/10—Investigating individual particles
    • G01N15/14—Optical investigation techniques, e.g. flow cytometry
    • G01N15/1429—Signal processing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/10—Investigating individual particles
    • G01N15/14—Optical investigation techniques, e.g. flow cytometry
    • G01N15/1434—Optical arrangements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/10—Investigating individual particles
    • G01N15/14—Optical investigation techniques, e.g. flow cytometry
    • G01N15/1456—Optical investigation techniques, e.g. flow cytometry without spatial resolution of the texture or inner structure of the particle, e.g. processing of pulse signals
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
    • G01N33/543—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/01—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials specially adapted for biological cells, e.g. blood cells
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N2015/0038—Investigating nanoparticles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/10—Investigating individual particles
    • G01N15/14—Optical investigation techniques, e.g. flow cytometry
    • G01N2015/1486—Counting the particles

Definitions

  • the present disclosure relates to an analysis device and an analysis method for analyzing biomaterials such as antibodies and antigens.
  • Immunoassays are known that quantitatively analyze disease detection and therapeutic effects by detecting particular antigens or antibodies as biomarkers associated with diseases.
  • One of the immunoassays is an enzyme-linked immunosorbent assay (ELISA) for detecting antigens or antibodies labeled by enzymes, which is widely used because of having the advantage of low costs.
  • ELISA enzyme-linked immunosorbent assay
  • the ELISA requires a long period of time, such as from several hours to a day, to complete a series of multiple steps including pretreatment, antigen-antibody reaction, bond/free (B/F) separation, and enzyme reaction.
  • Another technology is disclosed in which antibodies fixed to an optical disc are allowed to bind to antigens in a specimen, and the antigens are further bound to particles having antibodies and then scanned with an optical head, so as to count the particles captured on the disc in a short period of time (Japanese Unexamined Patent Application Publication No. H05-005741). Still another technology is disclosed in which biosamples or particles are adsorbed to a surface of an optical disc on which a tracking structure is formed, so as to detect changes in signal by an optical pickup (Japanese Translation of PCT International Application Publication No. 2002-530786).
  • a first aspect of the present embodiment provides an analysis device including: an optical scanning unit configured to optically scan a surface of a substrate to which particles are fixed; a pulse detector configured to detect a pulse wave and a pulse width of the pulse wave included in a detection signal obtained from the optical scanning unit when the optical scanning unit scans the substrate; and a counting unit configured to count the particles based on a pulse interval between two pulse waves each having a pulse width less than a first reference value when the pulse detector consecutively detects the two pulse waves.
  • a second aspect of the present embodiment provides an analysis method including: optically scanning a surface of a substrate to which particles are fixed; detecting a pulse wave and a pulse width of the pulse wave included in a detection signal obtained by scanning the substrate; and counting the particles based on a pulse interval between two pulse waves each having a pulse width less than a first reference value when the two pulse waves are consecutively detected in the detection signal.
  • FIG. 1 is a schematic block diagram for describing a fundamental configuration of an analysis device according to an embodiment.
  • FIG. 2A to FIG. 2F are enlarged cross-sectional views each schematically showing a substrate of the analysis device according to the embodiment, for describing an example of a method of fixing antibodies, antigens, and beads to the substrate.
  • FIG. 3 is a view showing simulation results of detection of adjacent beads while varying the number of beads, for describing characteristics between a spot position and signal intensity when scanning the substrate.
  • FIG. 4 is a view for describing characteristics between a spot position and signal intensity when scanning the substrate of the analysis device according to the embodiment, in which adjacent beads are detected while varying the number of beads.
  • FIG. 5 is a view for describing characteristics between a spot position and signal intensity when scanning the substrate of the analysis device according to the embodiment, in which adjacent beads are detected while varying the number of beads.
  • FIG. 6 is a view for describing a method of determining a reference value stored in a storage unit included in the analysis device according to the embodiment.
  • FIG. 7 is a view for describing a method of determining a reference value stored in the storage unit included in the analysis device according to the embodiment.
  • FIG. 8 is a flowchart for describing the operation of the analysis device according to the embodiment.
  • FIG. 9 is a view for describing the operation of the analysis device according to the embodiment.
  • FIG. 10 is a view for describing the operation of the analysis device according to the embodiment.
  • FIG. 11 is a view for comparing characteristics of biomarker concentration and counting results of beads in the analysis device according to the embodiment with those in a conventional device.
  • an analysis device includes a substrate 100 , a motor 2 that rotates the substrate 100 , an optical scanning unit 3 that optically scans the substrate 100 , and a controller 5 that controls the motor 2 and the optical scanning unit 3 .
  • the substrate 100 is formed into a circular shape having substantially the same dimensions as optical discs such as compact discs (CDs), digital versatile discs (DVDs), and Blu-ray discs (BD).
  • the substrate 100 has a track structure on the surface thereof that the optical scanning unit 3 can scan.
  • the track structure includes, for example, grooves, lands, and pits, and is formed into a spiral extending from the inner side to the outer side.
  • the substrate 100 is formed of a hydrophobic resin material, such as polycarbonate resin and cycloolefin polymer, used for common optical discs.
  • the substrate 100 may be, as necessary, provided with a thin film on the surface thereof, or subjected to surface treatment with a silane coupling agent.
  • antibodies 61 specifically binding to antigens 62 which are biomaterials serving as analytes, are fixed to the surface of the substrate 100 .
  • the antigens 62 are labeled with beads (particles) 66 to which antibodies 65 specifically binding to the antigens 62 are adsorbed, so that the antigens 62 and the beads 66 are correlatively fixed to the surface of the substrate 100 .
  • the antigens 62 are specifically bound to the antibodies 61 and 65 , so as to be used as biomarkers serving as indicators of diseases.
  • the antibodies 61 are preliminarily fixed to the surface of the substrate 100 .
  • the antibodies 61 are bound to the surface of the substrate 100 due to hydrophobic binding or covalent binding.
  • the antibodies 61 may be fixed to the surface of the substrate 100 via a substance such as avidin.
  • a sample solution 63 including the antigens 62 is applied dropwise to the surface of the substrate 100 .
  • the antigens 62 move through the sample solution 63 by Brownian motion and come into contact with the antibodies 61 , so as to be specifically bound to the antibodies 61 by an antigen-antibody reaction.
  • FIG. 2A the antibodies 61 are preliminarily fixed to the surface of the substrate 100 .
  • the antibodies 61 are bound to the surface of the substrate 100 due to hydrophobic binding or covalent binding.
  • the antibodies 61 may be fixed to the surface of the substrate 100 via a substance such as avidin.
  • a sample solution 63 including the antigens 62 is applied dropwise to the surface of the substrate 100
  • the surface of the substrate 100 to which the sample solution 63 is applied dropwise is subjected to spin washing with pure water or the like, so as to remove the sample solution 63 including excessive antigens 62 not bound to the antibodies 61 from the surface of the substrate 100 .
  • a buffer solution 64 including the beads 66 is applied dropwise to the surface of the substrate 100 .
  • the buffer solution 64 may be applied while the sample solution 63 remains on the surface of the substrate 100 .
  • the antibodies 65 adsorbed to the beads 66 specifically bind to the antigens 62 by the antigen-antibody reaction.
  • the beads 66 are then bound to the antigens 62 , so as to label the antigens 62 .
  • the beads 66 are formed of synthetic resin such as polystyrene including a magnetic material such as ferrite, and formed into a substantially spherical shape.
  • a diameter of the beads 66 is in the range of from several tens of nanometers to several hundreds of nanometers, and a particular example of the diameter is 200 nm.
  • the antibodies 61 and 65 may be any biomaterials having specificity that specifically bind to the antigens 62 .
  • a combination of the antibodies 61 and 65 is selected such that the antibodies 61 and 65 separately bind to different sites.
  • the types of the antibodies 61 and 65 are chosen differently from each other, so as to detect a biosample including two types of antigens 62 .
  • the antibodies 61 and 65 are, however, not limited thereto, and may be the same type because exosomes, which are different from typical antigens, include multiple antigens of the same kind of protein on the surface thereof.
  • the substrate 100 to which the buffer solution 64 is applied dropwise is washed with, for example, pure water, so as to remove the buffer solution 64 including excessive beads 66 not bound to the antigens 62 from the substrate 100 .
  • the substrate 100 is optically scanned by the optical scanning unit 3 , so as to detect the beads 66 to analyze the antigens 62 labeled with the beads 66 .
  • the optical scanning unit 3 includes a laser oscillator 31 , a collimator lens 32 , a beam splitter 33 , an actuator 34 , an objective lens 35 , a condensing lens 36 , and a light detector 37 .
  • the optical scanning unit 3 is an optical pickup that optically scans the substrate 100 .
  • the laser oscillator 31 emits laser light to the collimator lens 32 according to the control by the controller 5 .
  • the laser oscillator 31 is a semiconductor laser oscillator that emits laser light having, for example, a wavelength of 405 nm which is the same as that for reproduction of BD, and output of about 1 mW.
  • the collimator lens 32 collimates the laser light emitted from the laser oscillator 31 .
  • the beam splitter 33 reflects the laser light collimated by the collimator lens 32 toward the objective lens 35 .
  • the objective lens 35 concentrates the laser light transmitted via the beam splitter 33 on the surface of the substrate 100 , to which the antibodies 61 are fixed, due to the operation of the actuator 34 according to the control by the controller 5 , so as to image spot S.
  • the objective lens 35 has a numerical aperture of, for example, 0.85.
  • the laser light concentrated by the objective lens 35 is reflected from the substrate 100 and then reaches the beam splitter 33 .
  • the incident laser light passes through the beam splitter 33 and further reaches the light detector 37 via the condensing lens 36 .
  • the condensing lens 36 concentrates the laser light reflected from the substrate 100 into the light detector 37 .
  • the light detector 37 is, for example, a photodiode to output, to the controller 5 , a detection signal corresponding to the volume of the laser light reflected from the substrate 100 .
  • the controller 5 controls the operation of the motor 2 via a rotation controller 21 .
  • the motor 2 is controlled by the controller 5 to rotate the substrate 100 at a constant linear velocity (CLV).
  • the linear velocity is, for example, 4.92 m/s.
  • the controller 5 controls the operation of the laser oscillator 31 and the actuator 34 via an optical system controller 4 .
  • the actuator 34 is controlled by the controller 5 to move the optical scanning unit 3 in a radial direction of the substrate 100 so as to spirally scan the surface of the rotating substrate 100 .
  • the controller 5 also detects errors such as focus errors (FE) or tracking errors (TE) from the detection signal output from the light detector 37 .
  • the controller 5 controls the actuator 34 and other components to appropriately scan the surface of the substrate 100 depending on the errors detected.
  • the controller 5 includes a pulse detector 51 , a storage unit 52 , and a counting unit 50 .
  • the pulse detector 51 inputs the detection signal output from the light detector 37 .
  • the pulse detector 51 detects a pulse wave and a pulse width of the pulse wave included in the detection signal obtained from the optical scanning unit 3 .
  • the pulse detector 51 is a signal processing device such as a digital signal processor (DSP).
  • the storage unit 52 is a memory such as a semiconductor memory.
  • the storage unit 52 stores reference values corresponding to the pulse wave and the pulse width detected by the pulse detector 51 .
  • the counting unit 50 counts the number of beads 66 fixed to the surface of the substrate 100 according to the pulse wave detected by the pulse detector 51 and the reference values stored in the storage unit 52 .
  • the counting unit 50 is, for example, a central processing unit (CPU).
  • the counting unit 50 includes, as a logical structure, a first counter 501 , a second counter 502 , and a target counter 503 .
  • the first counter 501 measures pulse width Ta of the pulse wave detected by the pulse detector 51 .
  • the second counter 502 measures, depending on the pulse width Ta of the pulse wave detected by the pulse detector 51 , pulse interval Tb between the pulse wave and a pulse wave subsequently detected.
  • the target counter 503 counts the number of beads 66 according to the measurement results by the first counter 501 and the second counter 502 and the reference values stored in the storage unit 52 .
  • FIG. 3 shows simulation results of three detection signals DS 1 to DS 3 obtained in such a manner as to scan each of one projection pit assuming that one bead is present on the substrate 100 , adjacent two projection pits assuming that two beads are present on the substrate 100 , and adjacent three projection pits assuming that three beads are present on the substrate 100 .
  • the transverse axis represents a position of the spot S corresponding to each front bead 66 in a particular interval
  • the vertical axis represents signal intensity obtained such that each signal is normalized by a detection signal detected when there is no bead 66 .
  • the pulse width is assumed to gradually increase as the number of beads 66 increases, as indicated by the detection signal DS 1 with one isolated bead 66 , the detection signal DS 2 with two beads 66 , and the detection signal DS 3 with three beads 66 in this order.
  • a detection signal D 2 obtained such that adjacent two beads 66 are actually scanned includes two pulse waves with substantially the same pulse width which is smaller than a pulse width of a detection signal D 1 obtained such that one isolated bead 66 is scanned.
  • a detection signal D 3 obtained such that adjacent three beads are actually scanned includes two pulse waves having substantially the same pulse width as those of the detection signal D 2 and having a larger pulse interval than the detection signal D 2 .
  • a detection signal with adjacent four beads 66 scanned also includes two pulse waves having substantially the same width as those of the detection signal D 2 and having a larger pulse interval than the detection signal D 3 .
  • the inventors resolved the effects of light on a structure (particles) with a smaller size than a wavelength of the light having different pits from common optical discs as described above, by solving Maxwell's equations with regard to times and space variables by a finite-difference time-domain (FDTD) method.
  • the counting unit 50 can count the number of beads 66 with high accuracy when a plurality of beads 66 adjacent to each other are present on the substrate 100 , on the basis of the predetermined reference values stored in the storage unit 52 .
  • the storage unit 52 preliminarily stores first pulse width T 1 of the respective detection signals D 2 and D 3 and first reference value T 2 determined depending on the first pulse width T 1 when the optical scanning unit 3 scans a plurality of beads 66 adjacent to each other.
  • the first reference value T 2 is, for example, the sum of the first pulse width T 1 and a predetermined value.
  • the predetermined value added to the first pulse width T 1 maybe a jitter value included in the detection signal.
  • the predetermined value added to the first pulse width T 1 may also be approximately 100% to 130% of the jitter value.
  • the first reference value T 2 may be a predetermined percentage of the first pulse width T 1 .
  • the first reference value T 2 is approximately 100% to 130% of the first pulse width T 1 .
  • the storage unit 52 preliminarily stores second pulse width T 3 of the detection signal Dl and second reference value T 4 determined depending on the second pulse width T 3 when the optical scanning unit 3 scans a bead 66 isolated from other beads 66 .
  • the second reference value T 4 is, for example, the sum of the second pulse width T 3 and a predetermined value.
  • the predetermined value added to the second pulse width T 3 may be a jitter value included in the detection signal.
  • the predetermined value added to the second pulse width T 3 may also be approximately 100% to 130% of the jitter value.
  • the second reference value T 4 may be a predetermined percentage of the second pulse width T 3 .
  • the second reference value T 4 is approximately 100% to 130% of the second pulse width T 3 .
  • the operator allows the rotation controller 21 and the optical system controller 4 to respectively start operations of the motor 2 and the optical scanning unit 3 according to the control by the controller 5 .
  • the substrate 100 to which antigens 62 and beads 66 are fixed on the surface thereof by the antigen-antibody reaction is rotated at a constant linear velocity by the motor 2 , so as to be optically scanned by the optical scanning unit 3 .
  • the optical scanning unit 3 detects, with the light detector 37 , the laser light emitted from the laser oscillator 31 and reflected from the surface of the substrate 100 .
  • the light detector 37 outputs a detection signal corresponding to the volume of the detected laser light to the pulse detector 51 .
  • step S 1 the pulse detector 51 obtains the detection signal output from the light detector 37 to detect a falling edge of the obtained detection signal.
  • the pulse detector 51 preliminarily holds a threshold set to intensity corresponding to approximately one half of a peak value of the detection signal detected when beads 66 are scanned, and detects a point where the detection signal falls below the threshold as a falling edge of the detection signal.
  • step S 2 the first counter 501 starts measuring time Ta from the point where the falling edge is detected in step S 1 , as shown in FIG. 9 .
  • step S 3 the pulse detector 51 detects a rising edge of the detection signal obtained from the light detector 37 .
  • the pulse detector 51 preliminarily holds the threshold set to the intensity corresponding to approximately one half of the peak value of the detection signal detected when beads 66 are scanned, and detects a point where the detection signal exceeds the threshold as a rising edge of the detection signal.
  • step S 4 the first counter 501 fixes the time Ta from the point where the falling edge is detected in step S 1 to the point where the rising edge is detected in step S 3 , and resets it.
  • the target counter 503 obtains and holds the time Ta fixed by the first counter 501 as a pulse width (half width) Ta of the pulse wave detected in steps S 1 to S 3 .
  • step S 5 the target counter 503 reads out the first reference value T 2 from the storage unit 52 , and determines whether the pulse width Ta held in step S 4 is less than the first reference value T 2 .
  • the target counter 503 sets the process proceeding to step S 6 when the pulse width Ta is less than the first reference value T 2 , or sets the process proceeding to step S 9 when the pulse width Ta is greater than or equal to the first reference value T 2 .
  • the adjacent flag is a flag set in the target counter 503 in association with the second counter 502 .
  • step S 9 it is assumed that the detection signal D 3 is input into the pulse detector 51 , and the pulse detector 51 detects the rising edge of the first pulse wave in step S 3 . In such a case, since the adjacent flag is “Low” in step S 6 , the counting unit 50 sets the process proceeding to step S 12 .
  • step S 12 the second counter 502 starts measuring time Tb from the point where the rising edge is detected in step S 3 .
  • the target counter 503 sets, in association with the second counter 502 , the adjacent flag to “High” from the point where the rising edge is detected in step S 3 , and the process proceeds to step S 8 .
  • step S 8 the controller 5 determines whether the scanning of the substrate 100 in a predetermined tracking range by the optical scanning unit 3 is finished. The controller 5 ends the process when the scanning is finished, or sets the process returning to step S 1 when the scanning is not yet finished.
  • step S 9 it is assumed that the detection signal D 3 is input into the pulse detector 51 , and the pulse detector 51 detects the rising edge of the second pulse wave in step S 3 . In such a case, since the adjacent flag is “High” in step S 6 , the counting unit 50 sets the process proceeding to step S 7 .
  • step S 7 the second counter 502 determines the time Tb from the point where the first rising edge is detected in step S 3 to the point where the second rising edge is detected in the next step S 3 , and resets it.
  • the target counter 503 obtains and holds the time Tb determined by the second counter 502 as a pulse interval Tb of the two pulse waves detected in the two sets of steps S 1 to S 3 , and sets the adjacent flag to “Low”.
  • step S 7 the target counter 503 determines that the optical scanning unit 3 has scanned a plurality of beads 6 adjacent to each other, so as to read out the first pulse width T 1 from the storage unit 52 to count the number of beads 66 according to “1+(Tb/T 1 )”.
  • the value obtained from (Tb/T 1 ) is, for example, rounded off to the nearest integer.
  • the target counter 503 counts the number of beads 66 according to “1+(Tb/T 1 )”.
  • the target counter 503 sets the process proceeding to step S 8 after step S 7 .
  • the target counter 503 When the pulse width Ta is greater than or equal to the first reference value T 2 in step S 5 , the target counter 503 reads out the second reference value T 4 from the storage unit 52 , and determines in step S 9 whether the pulse width Ta held in step S 4 is less than the second reference value T 4 . The target counter 503 sets the process proceeding to step S 10 when the pulse width Ta is less than the second reference value T 4 , or sets the process proceeding to step S 11 when the pulse width Ta is greater than or equal to the second reference value T 4 .
  • the detection signal D 1 is input into the pulse detector 51 , and the pulse detector 51 detects the rising edge of the pulse wave in step S 3 .
  • the pulse width Ta is greater than or equal to the first reference value T 2 in step S 5 , and the pulse width Ta is less than the second reference value T 4 in step S 9 , the counting unit 50 sets the process proceeding to step S 10 .
  • step S 10 the target counter 503 determines that the optical scanning unit 3 has scanned one bead 66 isolated from other beads 66 and therefore the count of beads 66 results in one. Thus, the target counter 503 determines that the number of beads 66 counted is one when the pulse wave having the pulse width Ta greater than or equal to the first reference value T 2 and less than the second reference value T 4 is detected. The target counter 503 then sets the adjacent flag to “Low”, and the process proceeds to step S 8 .
  • the target counter 503 determines in step S 11 that the pulse wave having the pulse width greater than or equal to the second reference value T 4 is noise derived from foreign substances or aggregations, so as not to consider the pulse wave when implementing counting processing.
  • the target counter 503 sets the adjacent flag to “Low”, and the process proceeds to step S 8 .
  • the target counter 503 determines that the pulse wave detected first is noise derived from foreign substances or aggregations, so as not to consider the pulse wave when implementing counting processing.
  • the target counter 503 adds the number based on the pulse width Ta and the first pulse width T 1 to count up the number of beads 66 .
  • the target counter 503 adds 1 to count up the number of beads 66 .
  • the transverse axis represents biomarker concentration of analytes, and the vertical axis represents the counted results of beads 66 .
  • the counted results obtained by the analysis device according to the embodiment are indicated by the curved line P 1
  • the counted results obtained by the conventional method are indicated by the curved line P 2 .
  • the points of contact (points of intersection) between the lower limits of error and the background noise level Q of the respective curved lines P 1 and P 2 are respectively denoted by the limits of detection R 1 and R 2 .
  • the limit of detection R 1 in the analysis device according to the embodiment is improved compared with the limit of detection R 2 in the conventional method, and it is apparent that the sensitivity of the biomarker detection is improved. Accordingly, the analysis device according to the embodiment can improve the sensitivity for detecting diseases.
  • the analysis device varies the number to be added depending on the pulse width of the detection signal to count up the beads 66 when a plurality of beads 66 adjacent to each other are fixed onto the substrate 100 . Therefore, the analysis device according to the embodiment can count the beads 66 with high accuracy to improve the quantitative analysis of analytes even when irregular pulse waves are detected in the detection signal because of arrangement of the beads 66 .
  • the analysis device can count the beads 66 with higher accuracy, so as to reduce the influence of jitter when classifying the pulse width Ta.
  • the combination of the biomaterials as analytes and specific biomaterials specifically binding to the analytes is not limited to the combination of the antigens 62 and the antibodies and antibodies 65 fixed to the beads 66 .
  • specifically-binding combinations include a combination of a ligand and an acceptor (such as enzymatic proteins, lectins, and hormones), and a combination of nucleic acids having complementary base sequences to each other.
  • a well formed of, for example, silicone rubber may be provided on the surface of the substrate 100 , and the reaction between the target antibodies 61 , antigens 62 and beads 66 and the removal of materials not reacted by washing may be implemented within the well, so as to exclude the steps of, for example, spin washing and drying to simplify the process.
  • a plurality of wells may be provided in the same radius within the allowable area of the substrate 100 , so as to measure a plurality of specimens simultaneously.
  • the present invention includes a program for executing, by a computer, the functions of a notifying device according to the embodiment described above.
  • the program may be read out from a storage medium and input into the computer, or may be transmitted via an electrical communication circuit and input into the computer.

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