JP2011158327A - Analyzer, and analyzing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an analyzer capable of suppressing the irregularity of a measured value in a surface-enhanced Raman spectroscopic method, and an analyzing method. <P>SOLUTION: There are disclosed: the analyzer 1 equipped with a magnetism collection member 31 for applying magnetism collection processing to a reaction container in which a specimen, magnetic particles and a reagent containing labelled particles comprising metal nanoparticles are dispensed to form flocculated matter where a composite of the measuring target in a specimen and a reagent is flocculated and a photometric unit 33 for spectrally diffracting Raman scattered light emitted by irradiating the flocculated matter with the laser beam emitted from a laser beam source to photometrically measure it to analyze the specimen on the basis of surface-enhanced Raman scattered light photometrically measured by the photometric unit; and an analyzing method. The analyzer 1 suppresses the quantity of the energy per unit time and unit area of the laser beam to be irradiated with a flocculated matter to 0.001-0.005 mW/μm<SP>2</SP>. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an analysis apparatus and an analysis method for analyzing a sample using Raman spectroscopy called surface-enhanced Raman scattering (SERS).

  Raman spectroscopic analysis is an analysis method for detecting Raman scattered light generated by irradiating a specimen with laser light, and can obtain unique information depending on the molecular structure of the detection target. For this reason, Raman spectroscopic analysis is known as an effective analysis method for detecting biochemical substances such as viruses and proteins, environmental chemical substances, biosensors, and the like. However, the Raman spectroscopic analysis has a problem that the Raman scattered light is very weak and is not suitable for the microanalysis.

By the way, it is known that the Raman scattering intensity of adsorbed species on a metal surface such as gold or silver having an atomic level roughness may be enhanced by 10 ² to 10 ⁶ times as compared with non-adsorbed species. This phenomenon is called surface enhanced Raman scattering. Furthermore, it has been discovered that by aggregating metal nanoparticles, the Raman scattering intensity can be increased to about 10 ¹⁴ times that of non-adsorbed species. Therefore, in recent years, by using metal nanoparticles such as gold and silver having an atomic level roughness as a labeling substance, and further increasing the Raman scattering intensity by aggregating the complex of the labeling substance and the detection target An analysis method for analyzing a detection object has attracted attention.

  Specifically, an analyzer has been proposed in which a reagent containing magnetic particles that react with a detection target in a specimen is added to the specimen containing a metal nanoparticle as a labeling substance (see Patent Document 1). In such an analyzer, a complex of magnetic particles, an object to be detected, and a labeling substance is aggregated by applying a magnetic force, and the generated aggregate is irradiated with laser light, and surface-enhanced Raman scattered light is collected. The detection target in the specimen is detected by measuring

International Publication No. 2008/116093

  By the way, it has been conventionally known that the surface-enhanced Raman spectroscopy has low reproducibility because the measured Raman signal intensity varies, the measured values vary. For this reason, when surface-enhanced Raman spectroscopy is applied to clinical tests including measurement of biological substances, it has been desired to suppress variations in measured values.

  The present invention has been made in view of the above, and an object of the present invention is to provide an analysis apparatus and an analysis method capable of suppressing variations in measured values in surface-enhanced Raman spectroscopy.

In order to solve the above-described problems and achieve the object, the analyzer of the present invention performs a magnetic flux collection process on a reaction container in which a specimen and a reagent containing labeled particles composed of magnetic particles and metal nanoparticles are dispensed. A magnetic flux collecting means for generating an aggregate in which a complex of the measurement object in the specimen and the reagent is aggregated; and Raman scattered light generated by irradiating the aggregate with laser light emitted from a laser light source. A unit of laser light applied to the aggregate in an analyzer that analyzes the sample based on surface-enhanced Raman scattered light measured by the photometric means. The amount of energy per time and unit area is controlled to 0.001 to 0.005 mW / μm ² .

  Further, in the analysis apparatus according to the present invention, in the above invention, the aggregate is irradiated by changing the irradiation position of the laser beam by holding the reaction vessel and rotating or moving the laser beam. A driving unit that suppresses the amount of energy per unit time and unit area of the laser light, and a control unit that controls the Raman scattered light to be measured in a time-sharing manner by the light receiving unit.

  Further, the analyzer according to the present invention is the above-described invention, wherein the objective lens for converging the laser light and irradiating the aggregate, the laser light source, the objective lens, and the photometric means are mounted on the reaction vessel. A driving stage that approaches or separates from the reaction vessel, and a control unit that performs control to change the spot diameter of the laser beam irradiated to the aggregate by moving the driving stage toward or away from the reaction vessel. It is characterized by that.

  The analyzer according to the present invention, in the above invention, includes a condenser lens that condenses the Raman scattered light, and a light receiving stage that is mounted with the photometry means and approaches or separates from the condenser lens. It is characterized by having.

  Further, the analyzer according to the present invention, in the above invention, the reflecting mirror and the beam splitter are arranged in parallel at a predetermined interval, and are inclined with respect to the optical path of the laser beam emitted from the laser light source, It has a light branching means for branching the laser light into a plurality of light beams and irradiating the branched light beams at different positions on the aggregate.

  In the analyzer according to the present invention as set forth in the invention described above, the laser beam applied to the aggregate has a spot diameter of 100 to 200 μm.

In addition, in order to solve the above-described problems and achieve the object, the analysis method of the present invention includes a magnetic flux collecting process in a reaction container in which a specimen and a reagent containing labeled particles composed of magnetic particles and metal nanoparticles are dispensed. A magnetic flux collecting step for generating an aggregate in which a complex of the measurement object in the specimen and the reagent is aggregated, and spectroscopy of Raman scattered light generated by irradiating the aggregate with laser light. A photometric step of measuring the sample, and analyzing the specimen based on the surface-enhanced Raman scattered light photometrically measured in the photometric step, wherein the photometric step comprises: The amount of energy per unit time and unit area is 0.001 to 0.005 mW / μm ² .

  Moreover, the analysis method of the present invention is characterized in that, in the above invention, the laser beam applied to the aggregate has a spot diameter of 100 to 200 μm.

According to the present invention, the amount of energy per unit time and unit area of the laser light applied to the aggregate is suppressed to 0.001 to 0.005 mW / μm ² , thereby avoiding fading and denaturation of the aggregate. As a result, it is possible to provide an analysis apparatus and an analysis method capable of suppressing variations in measured values in surface-enhanced Raman spectroscopy.

FIG. 1 is a schematic diagram illustrating a configuration of an analyzer 1 according to the first embodiment. FIG. 2 is a cross-sectional view showing a reaction vessel in which a complex in which a specimen reacts with a first reagent and a second reagent is settled as an aggregate on the inner surface of the bottom wall by magnetic force. FIG. 3 is a perspective view showing a schematic configuration of the container first transfer device, the magnetic flux collecting table, and the container second transfer device. FIG. 4 is a diagram showing a configuration of a container storage portion of the magnetic flux collecting table shown in FIG. FIG. 5 is a diagram for explaining the reaction between the measurement target in the specimen and the magnetic particles and label particles contained in the reagent. FIG. 6 is a schematic configuration diagram showing the photometry unit shown in FIG. FIG. 7 is a schematic diagram showing a configuration of the light receiving device of the photometric unit shown in FIG. FIG. 8 is a cross-sectional view showing the configuration of the drive stage that holds and rotates the reaction vessel. FIG. 9 is a diagram showing an apparent irradiation spot of the laser beam that the aggregate has on the bottom wall of the reaction vessel. FIG. 10 is a diagram showing an apparent irradiation spot of the laser beam that the aggregate has on the bottom wall of the reaction container when the reaction container is movable in the two-dimensional direction. FIG. 11 shows, as Example 1-1, the signal intensity in the wave number range of 750 to 950 cm ⁻¹ when the surface-enhanced Raman scattered light in which aggregates of the rotated reaction vessel were generated was measured 10 times. It is a figure which shows the relationship. FIG. 12 shows, as Comparative Example 1-1, the Raman scattered light in the wave number range of 750 to 950 cm ⁻¹ when the surface-enhanced Raman scattered light in which the aggregate of the reaction vessel not rotated is generated 10 times. It is a figure which shows the relationship with signal strength. FIG. 13 is a schematic configuration diagram showing a photometric unit used by the analyzer according to the second embodiment. FIG. 14 is a cross-sectional view showing a configuration of a container holding stage that holds the reaction container. FIG. 15 is a signal with respect to the elapsed time of surface-enhanced Raman scattered light generated when laser beams having different spot diameters were irradiated as Examples 2-1 to 2-3 and Comparative Examples 2-1 to 2-4. It is a figure which shows the time change of an intensity | strength. FIG. 16 is a schematic configuration diagram showing a photometric unit used by the analyzer according to the third embodiment. FIG. 17 is a diagram for explaining the configuration of the light branching element of the photometry unit and the principle of light branching.

  Embodiments according to the analyzer of the present invention will be described below in detail with reference to the drawings. The analyzer of the present invention is not limited by the embodiments described below.

(Embodiment 1)
First, Embodiment 1 according to the analysis apparatus and analysis method of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram illustrating a configuration of an analyzer 1 according to the first embodiment. As shown in FIG. 1, the analyzer 1 irradiates a laser beam to an aggregate in which a complex of a specimen and a reagent including magnetic particles and labeled particles is aggregated, and the surface of the aggregate is enhanced. A measurement mechanism 2 that measures Raman scattered light and a control mechanism 5 that controls the entire analyzer 1 including the measurement mechanism 2 and analyzes the measurement results in the measurement mechanism 2 are provided. The analyzer 1 automatically performs Raman spectroscopic analysis on a plurality of specimens in cooperation with the measurement mechanism 2 and the control mechanism 5.

  As shown in FIG. 1, the measurement mechanism 2 includes a sample transport device 21, a sample dispensing device 22, a reaction container transfer device 23, a first reagent storage 24, a first reagent dispensing device 25, a second reagent storage 26, A two-agent dispensing device 27, a container first transfer device 28, a magnetic collection table 30, a container second transfer device 32, and a photometric unit 33 are provided.

  As shown in FIG. 1, the sample transport device 21 includes a plurality of sample racks 21b that hold a plurality of sample containers 21a containing samples and sequentially transfer them in the direction of the arrows in the figure. The specimen stored in the specimen container 21a is a body fluid such as blood, urine, saliva collected from the specimen provider.

  The sample dispensing device 22 has a sample nozzle for aspirating and discharging a sample attached to the distal end portion, and an arm that freely moves up and down in the vertical direction and rotates around a vertical line passing through the base end portion of the sample dispensing device 22 as a central axis. It has. As shown in FIG. 1, the sample dispensing device 22 sucks a sample from the sample container 21 a transferred to the sample suction position Psa on the sample transport device 21 by the sample nozzle, and the sample on the reaction container transfer device 23. The specimen is discharged into the reaction container 20 that has been transferred to the discharge position Psd.

  The reaction container transfer device 23 holds a plurality of reaction containers 20, and, as shown in FIG. 1, each reaction container 20 is moved in the direction of the arrow along the specimen discharge position Psd, the first reagent discharge position Pr1d, and the second reagent discharge position. Sequentially transferred to Pr2d. Here, as shown in FIG. 2, the reaction vessel 20 is a cylindrical body in which a plurality of ribs 20 a are formed in the vertical direction on the upper outer periphery, and the bottom wall 20 c is formed via a tapered portion 20 b that is reduced in taper. A small-diameter portion 20d having a flat surface is provided at the lower portion.

  As shown in FIG. 1, the first reagent storage 24 stores a plurality of first reagent containers 24 a that store first reagents. The first reagent storage 24 is rotated clockwise or counterclockwise by a drive mechanism (not shown), and transfers the first reagent container 24a to be dispensed to the first reagent suction position Pr1a by the first reagent dispensing device 25. .

  Similar to the first reagent storage 24, the second reagent storage 26 stores a plurality of second reagent containers 26a storing the second reagent, and transfers the second reagent containers 26a to be dispensed to the second reagent suction position Pr2a. To do.

  Here, examples of the measurement target in the sample to be analyzed include, for example, antibodies, proteins, peptides, amino acids, carbohydrates, hormones, steroids, vitamins, bacteria, DNA, RNA, cells, viruses, and any antigen. Materials, haptens, antibodies and combinations thereof.

  The first reagent is a reagent containing a magnetic substance having a solid phase formed on a reaction substance that binds to the measurement object in the specimen or the measurement object or an analog thereof. The second reagent is a reagent containing a labeling substance that binds to the measurement object or a labeling substance that binds the measurement object or an analog thereof.

  Here, the labeling substance is a nanoparticle containing gold or silver having an atomic level surface roughness, and on the surface of the nanoparticle containing gold or silver, the reactive substance that binds to the measurement object, or the above-mentioned The object to be measured or its analog is coated. The first reagent is a reagent containing a labeling substance that binds to the measurement object, and the second reagent is a reagent containing magnetic particles solid-phased with a reaction substance that binds to the measurement object. The relationship between the reagent and the second reagent may be reversed.

  The first reagent dispensing device 25 has a probe for aspirating and discharging the first reagent attached to the distal end portion, and can freely move up and down in the vertical direction and rotate around a vertical line passing through its base end portion as a central axis. It has an arm to perform. As shown in FIG. 1, the first reagent dispensing device 25 sucks the first reagent from the first reagent container 24a transferred to the first reagent suction position Pr1a of the first reagent storage 24 with the probe, and transfers the reaction container. The apparatus 23 discharges to the reaction container 20 transferred to the first reagent discharge position Pr1d.

  The second reagent dispensing device 27 has the same configuration as that of the first reagent dispensing device 25, and as shown in FIG. 1, the second reagent transferred to the second reagent suction position Pr2a of the second reagent storage 26. The second reagent is sucked from the container 26a by the probe and discharged to the reaction container 20 transferred to the second reagent discharge position Pr2d by the reaction container transfer device 23.

  Next, the container first transfer device 28, the magnetism collecting table 30, and the container second transfer device 32 will be described with reference to FIGS. FIG. 3 is a perspective view showing a schematic configuration of the container first transfer device 28, the magnetic flux collecting table 30, and the container second transfer device 32. FIG. 4 is a diagram showing the configuration of the container storage portion 30a of the magnetic flux collecting table 30 shown in FIG.

  As shown in FIG. 1, the container first transfer device 28 sets the reaction container 20 into which the sample, the first reagent, and the second reagent are dispensed from the reaction container transfer device 23 to the set position of the magnetic collection table 30 at a predetermined timing. Transfer to Pst. For example, as shown in FIG. 3, the container first transfer device 28 includes an arm 28b having a gripping device 28a for gripping the reaction vessel 20 at the tip as shown by an arrow Y1, and the other end supported by a column 28c. ing. The support column 28c is driven by a rotation mechanism and an elevating mechanism (not shown), and moves the support column 28c together with the arm 28b as indicated by an arrow Y2, and rotates the support column 28c together with the arm 28b as indicated by an arrow Y3.

  As shown in FIG. 3, the magnetic flux collecting table 30 is formed with a plurality of container storage portions 30a for storing the reaction containers 20 along the circumferential direction, and is rotated by driving means (not shown) and set at the set position Pst. The reaction container 20 is transferred along the circumferential direction. As shown in FIG. 4, the magnetic flux collecting table 30 is provided with a magnetic flux collecting member 31 made of, for example, a permanent magnet at the lower portion of each container storage portion 30 a. The magnetism collecting member 31 is provided in each container storage unit 30a so as to be close to or in contact with the bottom wall 20c of each stored reaction container 20, and a complex obtained by reacting the specimen with the first reagent and the second reagent by a magnetic force. It settles as an aggregate on the inner surface of the bottom wall 20c.

  Here, with reference to FIG. 5, the magnetism collection process by the magnetism collection table 30 is demonstrated. FIG. 5 is a diagram for explaining the reaction between the measurement target in the specimen and the magnetic particles and label particles contained in the reagent.

  First, the reaction in the reaction vessel 20 transferred to the magnetic collection table 30 will be described. Before the reaction container 20 is transferred to the magnetism collecting table 30, the sample is dispensed in the reaction container transfer device 23, and as shown in FIG. A second reagent containing the gold nanoparticle Gnp as a substance is dispensed. These magnetic particles Mp and gold nanoparticles Gnp react with the measurement object Om in the specimen, and as shown in FIG. 5 (2), a complex in which the magnetic particles Mp, gold nanoparticles Gnp, and the measurement object Om are combined. Cb is formed. With the composite Cb formed in the reaction vessel 20, the reaction vessel 20 is transferred to the magnetism collection table 30.

  At this time, the complex Cb formed in the reaction vessel 20 contains the magnetic particles Mp. For this reason, when the reaction vessel 20 is transferred to the magnetic collection table 30, the composite Cb is attracted and aggregated by the magnetic force of the magnetic collection member 31 to the bottom wall 20c of the reaction vessel 20, and the reaction vessel 20 is aggregated. It sinks to the inner surface of the bottom wall 20c.

  As shown in FIGS. 1 and 3, the container second transfer device 32 moves the reaction container 20 in which aggregates have settled in the magnetic collection table 30 from the extraction position Pto of the magnetic collection table 30 to the photometric unit 33 at a predetermined timing. Transport. The container second transfer device 32 has the same configuration as the container first transfer device 28, has a gripping device 32a for gripping the reaction vessel 20 as indicated by an arrow Y6, and the other end supported by a column 32c. Arm 32b. The support column 32c is driven by a rotation mechanism and an elevating mechanism (not shown) to move the support column 32c together with the arm 32b as indicated by an arrow Y7, and to rotate the support column 32c together with the arm 32b as indicated by an arrow Y8.

  Next, the photometry unit 33 will be described with reference to FIGS. FIG. 6 is a schematic configuration diagram showing the photometry unit shown in FIG. FIG. 7 is a schematic diagram showing a configuration of the light receiving device of the photometric unit shown in FIG. The photometry unit 33 turns the reaction vessel 20 transferred by the vessel second transfer device 32 around the rotation center axis Arc of the reaction vessel 20 into an aggregate that has settled on the inner surface of the bottom wall 20c of the reaction vessel 20. A photometric process is performed on the surface, and the surface-enhanced Raman scattered light emitted from the aggregate is spectrally measured. As shown in FIG. 6, the photometric unit 33 includes a laser light source 33a, a dichroic mirror 33c, a reflecting mirror 33e, and a light receiving device 33g.

  The laser light source 33a is a light source that emits laser light that generates Raman-scattered light whose surface is enhanced on the aggregate of the reaction vessel 20, and emits laser light having a wavelength of 785 nm, for example. As shown in FIG. 6, the laser light is converged into parallel light by a collimator lens 33b disposed between the laser light source 33a and the dichroic mirror 33c, and then incident on the dichroic mirror 33c.

  The dichroic mirror 33c is a mirror having a wavelength selectivity that reflects the laser light emitted from the laser light source 33a and transmits the surface-enhanced Raman scattered light generated by the aggregate of the reaction vessel 20. As shown in FIG. 6, the laser beam reflected by the dichroic mirror 33c is converged by an objective lens 33d arranged between the reflecting mirror 33e.

  As shown in FIG. 6, the reflecting mirror 33e reflects the laser beam converged by the objective lens 33d, and irradiates the aggregate that has settled on the inner surface of the bottom wall 20c of the reaction vessel 20 from below. At this time, the reflecting mirror 33e irradiates the reflected laser light to a position off the center of the bottom wall 20c of the reaction vessel 20, that is, a position off the rotation center axis Arc of the reaction vessel 20 on the bottom wall 20c. Thereby, the aggregate generates Raman scattered light whose surface is enhanced by the laser light reflected by the reflecting mirror 33e. The generated Raman scattered light is reflected by the reflecting mirror 33e, converged to parallel light by the objective lens 33d, and then transmitted through the dichroic mirror 33c. And the Raman scattered light which permeate | transmitted the dichroic mirror 33c is condensed by the condensing lens 33f, and injects into the light-receiving device 33g.

  As shown in FIG. 7, the light receiving device 33g is provided with a slit 33h on the incident side of the Raman scattered light, and the grating 33i that splits the Raman scattered light that has passed through the slit 33h, and the Raman scattered light that has been split by the grating 33i. It has a line sensor 33j that receives and measures light for each wavelength. The light amount signal for each wavelength of the Raman scattered light measured by the light receiving device 33g is output to the control unit 51, and the analysis unit 53 analyzes the specific component of the sample and its content.

  FIG. 8 is a cross-sectional view showing the configuration of the drive stage 40 that holds and rotates the reaction vessel 20. The drive stage 40 rotates the reaction vessel 20 around the rotation center axis Arc (see FIG. 6), so that the unit time and unit of laser light applied to the aggregate Ag settled on the bottom wall 20c of the reaction vessel 20 It is a drive means which suppresses the energy amount per area. As shown in FIG. 8, in the drive stage 40, a rotary holder 42 that holds the reaction vessel 20 is rotatably installed via a bearing 41 that is disposed in an opening 40c formed in the stage 40b above the support column 40a. .

  The rotation holder 42 rotates together with the reaction vessel 20 around the vertical rotation center axis Arh by engaging the gear portion 42 a provided on the upper portion with the gear 44 attached to the rotation shaft 43 a of the drive motor 43. Therefore, the rotation holder 42 rotates with the rotation center axis Arc (see FIG. 6) of the reaction vessel 20 aligned with the rotation center axis Arh. For example, the rotation holder 42 is preferably rotated at 10 to 30 revolutions per minute (rpm), and most preferably at 20 revolutions per minute (rpm).

  Here, as shown in FIG. 8, in the driving stage 40, a mirror holder 45 for holding the reflecting mirror 33e is provided on the support column 40a. The mirror holder 45 is inclined at 45 ° with respect to the horizontal plane so as to hold the reflecting mirror 33e so that the laser light always enters the bottom wall 20c of the reaction vessel 20 perpendicularly. However, the mirror holder 45 is slightly displaced from the position where the optical axis AOL of the objective lens 33d and the rotation center axis Arh of the rotation holder 42 intersect the surface of the reflecting mirror 33e to the optical axis AOL direction or the rotation center axis Arh direction. The reflecting mirror 33e is held. Thereby, the laser beam is perpendicularly incident on a position deviated from the center of the bottom wall 20c of the reaction vessel 20, that is, a position deviated from the rotation center axis Arc of the reaction vessel 20 on the bottom wall 20c, and the inner surface of the bottom wall 20c. The aggregate Ag settled on the substrate is irradiated.

  The reaction container 20 for which photometry processing has been completed in the photometry unit 33 is taken out of the photometry unit 33 by a transfer mechanism (not shown) and discarded.

  As illustrated in FIG. 1, the control mechanism 5 includes a control unit 51, an input unit 52, an analysis unit 53, a storage unit 54, and an output unit 55. These units included in the measurement mechanism 2 and the control mechanism 5 are electrically connected to the control unit 51.

  The control part 51 is comprised using CPU etc., and controls the process and operation | movement of each structure part which the analysis apparatus 1 mentioned above. The control unit 51 performs predetermined input / output control on information input / output to / from each of these components, and performs predetermined information processing on the information. In the first embodiment, the control unit 51 controls the light receiving device 33g so as to measure Raman scattered light in a time division manner.

  The input unit 52 is configured using a keyboard, a mouse, and the like, and acquires various information necessary for analyzing the sample, instruction information for the analysis operation, and the like from the outside.

  The analysis unit 53 analyzes the specimen based on the light quantity signal of the Raman scattered light based on the Raman spectroscopic analysis result input from the photometry unit 33.

  The storage unit 54 is configured using a hard disk that magnetically stores information and a memory that loads various programs related to the process from the hard disk and electrically stores them when the analyzer 1 executes the process. Various information including the analysis result of the sample is stored. The storage unit 54 may include an auxiliary storage device that can read information from a storage medium such as a CD-ROM, a DVD-ROM, and a PC card.

  The output unit 55 is configured using a printer, a speaker, and the like, and outputs various information including the analysis result of the sample.

  As shown in FIG. 1, the analyzer 1 configured as described above controls the sample distribution in each reaction vessel 20 while transferring the plurality of reaction vessels 20 by the reaction vessel transfer device 23 as shown in FIG. 1. The sample is dispensed by the injection device 22, the first reagent is dispensed by the first reagent dispensing device 25, and the first reagent is dispensed by the second reagent dispensing device 27. Then, the sample, the first reagent, and the second reagent are dispensed, and the reaction container 20 transferred to the end of the reaction container transfer device 23 is transferred from the reaction container transfer device 23 to the magnetic collection table 30 by the container first transfer device 28. It is transferred to the set position Pst.

  As shown in FIG. 1, the reaction container 20 transferred to the set position Pst of the magnetic collection table 30 is transferred to the extraction position Pto by the rotation of the magnetic collection table 30, while the magnetic particles Mp contained in the first reagent are included. And the gold nanoparticle Gnp, which is a labeling substance contained in the second reagent, reacts with the measurement object Om in the specimen to form a complex Cb (see FIG. 5). As a result, while the reaction container 20 is transferred to the take-out position Pto, the composite Cb in which the magnetic particles Mp, the gold nanoparticles Gnp, and the measurement object Om are combined is attracted to the bottom wall 20c by the magnetic force of the magnetic collecting member 31. Then, it aggregates and settles on the inner surface of the bottom wall 20c as aggregate Ag (see FIG. 8).

  The reaction container 20 thus transferred to the take-out position Pto of the magnetic collection table 30 is transferred to the photometric unit 33 by the container second transfer device 32 as shown in FIG. As shown in FIG. 8, the reaction vessel 20 transferred to the photometry unit 33 is rotated by the rotary holder 42 around the rotation center axis Arh, while the laser light emitted from the laser light source 33a is reflected on the bottom wall 20c. The aggregate Ag settled on the inner surface from below is irradiated. Thereby, the aggregate Ag generates Raman scattered light whose surface is enhanced by the irradiated laser light.

  The generated surface-enhanced Raman scattered light is reflected by the reflecting mirror 33e, and then enters the light receiving device 33g through the objective lens 33d, the dichroic mirror 33c, and the condenser lens 33f. The light receiving device 33 g measures the Raman scattered light in a time-sharing manner under the control of the control unit 51 and outputs the light amount signal to the control unit 51. As a result, the analysis unit 53 analyzes the specific component of the specimen and its content based on the light quantity signal.

  At this time, as shown in FIG. 8, the analyzer 1 rotates the reaction vessel 20 around the rotation center axis Arh by the rotation holder 42, while the laser light emitted from the laser light source 33 a is bottomed from the bottom of the reaction vessel 20. The aggregate Ag settled on the inner surface of the wall 20c is irradiated. For this reason, the aggregate Ag on the inner surface of the bottom wall 20c changes the irradiation position of the laser beam in the circumferential direction under the analysis method according to the first embodiment of the present invention, and is irradiated per unit time and unit area. The amount of energy is controlled to an appropriate value that does not cause fading or denaturation.

Here, based on the energy amount of the laser light emitted from the laser light source 33a, the diameter of the irradiation spot Sp, the distance of the irradiation spot Sp from the rotation center axis Arc of the reaction vessel 20, and the rotation speed (rpm) of the rotary holder 42. When the amount of energy per unit time and unit area of the laser light irradiated to each irradiation spot Sp is calculated, it becomes 0.001 to 0.005 mW / μm ² per unit time and unit area.

  The light receiving device 33g measures the surface-enhanced Raman scattered light generated by the aggregate Ag by irradiation with the laser beam having the appropriate energy amount in a time division manner.

  For this reason, the analyzer 1 of Embodiment 1 can acquire the data which are reproducible and reliable, suppressing the dispersion | variation in a measured value in the analysis of the sample using surface enhancement Raman spectroscopy.

  Here, the reaction vessel 20 is continuously irradiated with laser light from below the bottom wall 20c, but the light receiving device 33g measures the surface-enhanced Raman scattered light generated by the aggregate Ag in a time division manner. For this reason, the aggregate of the reaction container 20 apparently has a plurality of laser beam irradiation spots Sp per unit time on the bottom wall 20c, as shown in FIG. 9A. Accordingly, when the number of rotations of the rotary holder 42 for rotating the reaction vessel 20 is increased and the measurement time by the light receiving device 33g is shortened, the aggregate of the reaction vessel 20 is apparently unit, as shown in FIG. 9B. The number of laser beam irradiation spots Sp per time can be increased.

  Moreover, when changing the irradiation position of the laser beam irradiated to the aggregate Ag on the inner surface of the bottom wall 20c, the driving stage 40 is replaced with two axes orthogonal to each other in the horizontal plane instead of rotating the reaction vessel 20 with the rotating holder 42. The reaction vessel 20 may be configured to be movable in two directions. In this way, the aggregate of the reaction vessel 20 apparently has a plurality of laser beam irradiation spots Sp in two axial directions per unit time on the bottom wall 20c as shown in FIG. 10 (a). Become. At this time, if the moving speed of the drive stage 40 in the biaxial direction is increased and the measurement time by the light receiving device 33g is shortened, the aggregates in the reaction vessel 20 appear to be unit, as shown in FIG. 10 (b). The number of laser light irradiation spots Sp per time can be increased. Furthermore, when the movement in the biaxial direction is combined, the aggregate of the reaction vessel 20 can freely change the position and number of irradiation spots Sp as shown in FIG. 10 (c) and FIG. 10 (d). .

(Example 1-1)
Next, Example 1-1 of the analyzer according to the first embodiment will be described. In Example 1-1, the laser light source 33a is placed on the bottom wall 20c of the reaction vessel 20 while the reaction vessel 20 is rotated at 12 revolutions per minute (rpm) by the rotating holder 42 using the analyzer 1 of the first embodiment. The emitted laser beam was irradiated. At this time, the surface-enhanced Raman scattered light generated by the aggregate Ag in the reaction vessel 20 is dispersed by the light receiving device 33g, and the wave number when measured 10 times in 0.04 seconds per time is 750 to 950 cm. The relationship with the signal intensity of the output signal of the light receiving device 33g in the range of ⁻¹ is shown in FIG. In FIG. 11, ten curves are displayed as output signals of the light receiving device 33g.

  As is clear from FIG. 11, the output signal had a small difference in intensity between the signals in 10 measurements. Therefore, it can be seen that the analyzer 1 can suppress variations in measured values. For this reason, the analyzer 1 can acquire reproducible and reliable data.

  At this time, the dispersion coefficient CV (= σ / X), which is the ratio of the standard deviation σ with respect to the intensity of the 10 output signals and the arithmetic mean X, was 1.5 (%).

(Comparative Example 1-1)
For comparison, the Raman scattered light generated by the aggregate Ag of the reaction vessel 20 is shown in Example 1-1, except that the rotation of the reaction vessel 20 by the rotation holder 42 is stopped using the analyzer 1 of the first embodiment. And measured under the same conditions. The results are shown in FIG. 12 in the same manner as in Example 1-1. Also in FIG. 12, ten curves are displayed as output signals of the light receiving device 33g.

  As is clear when compared with the measurement results of Example 1-1, the ten output signals of Comparative Example 1-1 have large differences in intensity between the signals in 10 measurements, and the measured values vary. It was found that it was difficult to obtain reproducible data. Regarding the intensity of the 10 output signals shown in Comparative Example 1-1, the dispersion coefficient was determined in the same manner as in Example 1-1, and was 10.0 (%). The dispersion coefficient in Example 1-1 was The performance was larger than the dispersion coefficient of Comparative Example 1-1.

  The photometric unit 33 intermittently oscillates the laser light source 33a to intermittently generate laser light to irradiate the aggregate of the reaction vessel 20, and the surface-enhanced Raman scattering generated by the intermittently oscillated laser light. The light may be measured by the light receiving device 33g.

(Embodiment 2)
Next, Embodiment 2 according to the analysis apparatus and analysis method of the present invention will be described below with reference to the drawings. FIG. 13 is a schematic configuration diagram showing a photometric unit used by the analyzer according to the second embodiment. FIG. 14 is a cross-sectional view showing a configuration of a container holding stage that holds the reaction container. In the following description, the same reference numerals are used for the same components as those of the analyzer according to the first embodiment.

  In the analyzer of the first embodiment, the photometric unit rotates the reaction vessel to change the irradiation position of the laser beam, thereby suppressing the amount of energy per unit time and unit area of the laser beam irradiated on the aggregate. On the other hand, the analyzer of the second embodiment suppresses the amount of energy per unit time and unit area of the laser light irradiated to the aggregate by the spot diameter of the laser light irradiated to the reaction vessel by the photometric unit.

  As shown in FIG. 13, the photometric unit 33A includes a laser light source 33a, a collimator lens 33b, a dichroic mirror 33c, an objective lens 33d, a reflecting mirror 33e, a condensing lens 33f, and a light receiving device 33g. In the photometric unit 33A, a light receiving device 33g is installed on the light receiving stage 34, and a laser light source 33a, a collimator lens 33b, a dichroic mirror 33c, an objective lens 33d, a condensing lens 33f, and a light receiving stage 34 are installed on the drive stage 36. Yes.

  As the light receiving stage 34, a single axis stage such as a rectilinear stage capable of approaching or moving away from the condenser lens 33f is used as indicated by an arrow A in the figure, and the light receiving device 33g is operated by operating an adjusting screw 34a such as a micrometer. And the condenser lens 33f are adjusted.

  The drive stage 36 is a uniaxial stage similar to the light receiving stage 34, and approaches or separates from the reflecting mirror 33e as indicated by an arrow B in the drawing by an adjusting screw 36a such as a micrometer, thereby reflecting the reflecting mirror of the objective lens 33d. Adjust the distance to 33e. As a result, the drive stage 36 is a control unit that performs control to change the spot diameter of the laser light irradiated to the aggregate Ag that has moved closer to and away from the reaction vessel 20 and settled on the bottom wall 20c.

At this time, the spot diameter of the laser light irradiated on the aggregate Ag is preferably 100 to 200 μm. When the spot diameter of the laser beam is set to a diameter in this range, the photometry unit 33 has a unit time of the laser beam irradiated to the aggregate Ag and an energy amount per unit area of 0.001 to 0.001 according to the analysis method of the present invention. It is suppressed to 0.005 mW / μm ² and does not cause discoloration or modification to the aggregate Ag.

  Here, when the distance between the driving stage 36 and the reflecting mirror 33e is adjusted, an aggregate of the reaction vessel 20 is generated, and the surface-enhanced Raman scattered light is incident on the objective lens 33d after being reflected by the reflecting mirror 33e. The angle changes. For this reason, as a result of the change in the incident angle of the Raman scattered light incident on the condenser lens 33f, the incident angle of the Raman scattered light incident on the light receiving device 33g from the condenser lens 33f changes. Therefore, the photometric unit 33A operates the adjusting screw 34a so that the Raman scattered light incident on the light receiving device 33g can be properly received, thereby moving the light receiving stage 34 closer to or away from the condenser lens 33f. The distance between the device 33g and the condenser lens 33f is adjusted. Note that the light receiving stage 34 and the driving stage 36 may be provided with actuators and automatically driven by the control unit 51.

  Next, irradiation of the laser beam to the reaction container 20 by the reflecting mirror 33e will be described below with reference to FIG. FIG. 14 is a cross-sectional view showing a configuration of a container holding stage that holds the reaction container.

  As shown in FIG. 14, the container holding stage 40A is a drive stage in which a container holder 42A is installed in an opening 40c formed in the stage 40b above the support column 40a. The container holding stage 40A holds the reaction container 20 in the container holder 42A.

  At this time, as shown in FIG. 14, the reflecting mirror 33e is supported by the container holding stage 40A via the mirror holder 45, but the horizontal plane so that the laser light is always incident on the bottom wall 20c of the reaction container 20 vertically. It is arranged at an angle of 45 ° to the angle. The reflecting mirror 33e is arranged so that the optical axis AOL of the objective lens 33d and the axis Ac passing through the center of the reaction vessel 20 intersect at the surface of the reflecting mirror 33e. As a result, the laser beam is incident on the aggregate Ag that is perpendicularly incident on the bottom wall 20 c on the axis Ac passing through the center of the reaction vessel 20 and settles on the inner surface of the bottom wall 20 c of the reaction vessel 20.

In the analyzer of the second embodiment, the photometric unit 33A and the container holding stage 40A are configured as described above. Therefore, in the analyzer according to the second embodiment, the laser beam having a spot diameter of 100 to 200 μm emitted from the laser light source 33a is irradiated from below the reaction vessel 20 to the aggregate that has settled on the inner surface of the bottom wall 20c. The That is, for the aggregate, laser light having an energy amount of 0.001 to 0.005 mW / μm ² that does not cause discoloration or denaturation of the aggregate per unit time or unit area under the analysis method of the present invention. Is irradiated.

  For this reason, the analyzer according to the second embodiment can suppress the variation in the measurement value in the analysis of the sample using the surface enhanced Raman spectroscopy, and can acquire the reproducible and highly reliable data.

(Examples 2-1 to 2-3)
The analysis method of the present invention is applied to each of the aggregates of the plurality of reaction vessels 20 in which the same amount of the same specimen, the first reagent, and the second reagent are dispensed and reacted using the analyzer of the second embodiment. In addition, the emission intensity is 28.5 mW, and the spot diameter is 100 μm (Example 2-1), 150 μm (Example 2-2), and 200 μm (Example 2-3). The surface-enhanced Raman scattered light was measured by the light receiving device 33g for 95 seconds. The result is shown in FIG. 15 as the time change of the signal intensity output from the light receiving device 33g.

  As shown in FIG. 15, when the spot diameter of the laser beam was 100 μm, 150 μm, and 200 μm, the signal intensity output from the light receiving device 33g was stable over time. Therefore, it can be seen that the analyzer according to the second embodiment can suppress variations in measured values. For this reason, the analyzer according to the second embodiment can acquire reproducible and highly reliable data.

(Comparative Examples 2-1 to 2-4)
For comparison, each of the aggregates in the plurality of reaction vessels 20 in which the same sample, the first reagent, and the second reagent are dispensed in the same amount and reacted using the analyzer of the second embodiment is used. Under the analysis method, the surface is enhanced by irradiating laser beams with spot diameters of 250 μm (Comparative Example 2-1), 50 μm (Comparative Examples 2-2 and 2-3), and 7 μm (Comparative Example 2-4). The Raman scattered light was measured in the same manner as in Examples 2-1 to 2-3. The results are also shown in FIG.

  As apparent from comparison with the measurement results of Examples 2-1 to 2-3, when the spot diameter of the laser beam is 50 μm (Comparative Examples 2-2, 2-3) or 7 μm (Comparative Example 2-4), The signal intensity output from the light receiving device 33g tends to decrease with time. When the spot diameter is 7 μm (Comparative Example 2-4), the signal intensity change width is large. However, when the spot diameter is 250 μm (Comparative Example 2-1), the signal intensity output from the light receiving device 33g is not changed over time or significantly, but the measurements of Examples 2-1 to 2-3 are performed. The value is reduced to about 50%. This is because when the spot diameter is 250 μm (Comparative Example 2-1), the spot diameter is larger than that of Examples 2-1 to 2-3, and the unit of laser light applied to the aggregate of the reaction vessel 20 It is considered that the amount of energy per unit time and area is reduced, and the discoloration and denaturation of the aggregates are suppressed.

  And when the spot diameter is 50 μm (Comparative Examples 2-2 and 2-3), it is reduced to about 80 to 50% of the measured values of Examples 2-1 to 2-3, and the spot diameter is 7 μm. In some cases, the measurement values of Examples 1 to 3 were reduced to about 60 to 20%. This is because, when the spot diameter is 7 μm (Comparative Example 2-4), the unit time of the laser light irradiated to the aggregate of the reaction vessel 20 is smaller than that of Examples 2-1 to 2-3. It is considered that the energy amount per unit area is increased and the aggregate is discolored or denatured.

(Embodiment 3)
Next, Embodiment 3 according to the analysis apparatus and analysis method of the present invention will be described below with reference to the drawings. FIG. 16 is a schematic configuration diagram showing a photometric unit used by the analyzer according to the third embodiment. FIG. 17 is a diagram for explaining the configuration of the light branching element of the photometry unit and the principle of light branching.

  In the analyzer of the second embodiment, the amount of energy per unit time and unit area of the laser light irradiated to the aggregate is controlled by the spot diameter of the laser light irradiated to the reaction vessel by the photometric unit. On the other hand, the analyzer of the third embodiment branches the laser light that the photometric unit irradiates the reaction vessel into a plurality of light beams, and irradiates the branched light beams to different positions on the aggregate. The amount of energy per unit time and unit area of the laser light irradiated to the aggregate is suppressed.

  As shown in FIG. 16, the photometric unit 33B includes a laser light source 33a, a light branching element 33k, a dichroic mirror 33c, a collimator lens 33b, a condenser lens 33f, and a light receiving device 33g.

  The light branching element 33k is an optical element that branches the laser light emitted from the laser light source 33a into four light beams. As shown in FIG. 17, the reflecting mirror M and the beam splitter Sb are parallel with a surface interval d. Are arranged. The optical branching element 33k is disposed between the laser light source 33a and the dichroic mirror 33c on the optical path of the laser light L0 emitted from the laser light source 33a. At this time, the optical branching element 33k is inclined at an angle α with respect to a plane orthogonal to the transmission direction of the laser light transmitted through the beam splitter Sb, and the reflecting mirror M is positioned in the front stage in the irradiation direction of the laser light source 33a. The beam splitter Sb is disposed at the position.

  When the laser beam L0 is incident on the first incident point P1 of the beam splitter Sb at an incident angle θ, the optical branching element 33k transmits a part as a branched light beam L1 and reflects the remaining part at a reflection angle θ. The light beam reflected at the first incident point P1 is reflected by the reflecting mirror M and enters the second incident point P2 at an incident angle θ, and a part of the light beam is branched as a branched light beam L2 as in the case of the first incident point P1. The light beam L1 is transmitted parallel to the light beam L1, and the remainder is reflected at the reflection angle θ.

  Similarly, the light branching element 33k transmits the branched light beams L3 and L4 in parallel with the branched light beam L1 at the third incident point P3 and the fourth incident point P4. However, since the light beam reflected at the fourth incident point P4 is not reflected by the reflecting mirror M and is emitted in a direction different from the branched light beams L1 to L4, the laser light L0 has four light beams L1 to L4. It is branched into the luminous flux.

  At this time, in the beam splitter Sb, the reflectance Ri at the first incident point P1 to the fourth incident point P4 is expressed by Ri = (4-i) / (5-i) (where i = 1 to 4). It is created so as to have a reflectance distribution.

Therefore, in the beam splitter Sb, the reflectance R1 at the first incident point P1 is 3/4, the reflectance R2 at the second incident point P2 is 2/3, the reflectance R3 at the third incident point P3 is 1/2, The four incident points P4 are created so as to have a reflectance distribution in which the reflectance R4 is zero. When the reflectance distribution of the beam splitter Sb is created as described above, the transmitted branched light beams L1 to L4 have the light intensity I1 to I4 given by the following equation equal to I0 / 4, and the laser light L0 has the light intensity Are split into four light beams having the same value.
I1 = I0. (1-R1) = I0 / 4
I2 = I0.R1. (1-R2) = I0 / 4
I3 = I0 * R1 * R2 * (1-R3) = I0 / 4
I4 = I0.R1.R2.R3. (1-R4) = I0 / 4

  In the photometry unit 33B of the analyzer according to the third embodiment, since the light branching element 33k is configured as described above, the laser light emitted from the laser light source 33a is 4 by the light branching element 33k as shown in FIG. It is branched into a luminous flux of books. The four branched light beams L1 to L4 are transmitted through the dichroic mirror 33c and irradiated to different positions of the aggregate in the reaction vessel 20, and Raman scattered light whose surface is enhanced is generated. The Raman scattered light is reflected by the dichroic mirror 33c, converged to parallel light by the collimator lens 33b, condensed by the condenser lens 33f, and then incident on the light receiving device 33g.

At this time, the amount of energy per unit time and unit area of the laser light irradiated to the different positions of the aggregate by the branched light beams L1 to L4 is 0.001 to 0.005 mW / μm ² .

  In the analyzer of the third embodiment, the laser beam irradiated to the reaction vessel by the light branching element 33k is branched into a plurality of light beams having the same light intensity, and the branched branch light beams are irradiated to different positions of the aggregate. Thereby, the analyzer of Embodiment 3 suppresses the amount of energy per unit time and unit area of the laser light irradiated to the aggregate based on the analysis method of the present invention. For this reason, the aggregate is irradiated with laser light with appropriate values per unit time and unit area, which does not cause fading or denaturation.

  Therefore, the analyzer according to the third embodiment can suppress the variation in the measured value in the analysis of the specimen using the surface enhanced Raman spectroscopy, and can acquire data having reproducibility and excellent reliability.

  As described above, the analysis apparatus and analysis method of the present invention are useful for suppressing variations in measured values in surface-enhanced Raman spectroscopy.

DESCRIPTION OF SYMBOLS 1 Analyzer 2 Measuring mechanism 20 Reaction container 21 Sample transport apparatus 22 Sample dispensing apparatus 23 Reaction container transfer apparatus 24 1st reagent storage 25 1st reagent dispensing apparatus 26 2nd reagent storage 27 2nd reagent dispensing apparatus 28 Container number 1 DESCRIPTION OF SYMBOLS 1 Transfer apparatus 30 Magnetic collection table 31 Magnetic collection member 32 Container 2nd transfer apparatus 33, 33A Photometry unit 33a Laser light source 33b Collimator lens 33c Dichroic mirror 33d Objective lens 33e Reflective mirror 33f Condensing lens 33g Light receiving apparatus 33k Light branching element 34 Light reception Stage 36 Drive stage 40 Drive stage 41 Bearing 42 Rotating holder 43 Drive motor 44 Gear 45 Mirror holder 5 Control mechanism 51 Control unit 52 Input unit 53 Analysis unit 54 Storage unit 55 Output unit Ag Aggregate M Reflector Sb Beam splitter

Claims (8)

Aggregates in which a complex of a measurement object in the sample and the reagent is aggregated by subjecting the sample to a reaction container in which a reagent containing labeled particles composed of magnetic particles and metal nanoparticles is dispensed. Magnetic flux collecting means for generating
Photometric means for spectroscopically measuring Raman scattered light generated by irradiating the aggregate with laser light emitted from a laser light source;
An analyzer for analyzing the specimen based on surface-enhanced Raman scattered light measured by the photometric means,
An analyzer characterized by suppressing the amount of energy per unit time and unit area of the laser light irradiated to the aggregate to 0.001 to 0.005 mW / μm ² . The amount of energy per unit time and unit area of the laser light irradiated on the aggregate by changing the irradiation position of the laser light by holding the reaction vessel and rotating or moving with respect to the laser light. Driving means for suppressing,
The analyzer according to claim 1, further comprising a control unit that controls the Raman scattered light to be measured by the light receiving unit in a time-sharing manner. An objective lens for converging the laser beam and irradiating the aggregate;
A drive stage mounted with the laser light source, the objective lens, and the photometric means to approach or leave the reaction vessel;
Control means for performing control to change the spot diameter of the laser beam irradiated to the aggregate by moving the drive stage toward or away from the reaction vessel;
The analyzer according to claim 1, further comprising:   The analyzer according to claim 3, further comprising: a condensing lens that condenses the Raman scattered light; and a light receiving stage that mounts the photometry means and approaches or separates from the condensing lens. .   A reflecting mirror and a beam splitter are arranged in parallel at a predetermined interval, are installed to be inclined with respect to the optical path of the laser light emitted from the laser light source, and the laser light is branched into a plurality of light beams. 2. The analyzer according to claim 1, further comprising: a light branching unit that irradiates different positions of the aggregate with the branched light beams.   6. The analyzer according to claim 1, wherein the laser beam irradiated to the aggregate has a spot diameter of 100 to 200 μm. Aggregates in which a complex of a measurement object in the sample and the reagent is aggregated by subjecting the sample to a reaction container in which a reagent containing labeled particles composed of magnetic particles and metal nanoparticles is dispensed. A magnetic flux collecting process for generating
A photometric step of spectroscopically measuring Raman scattered light generated by irradiating the aggregate with laser light; and
In the analysis method for analyzing the specimen based on the surface-enhanced Raman scattered light photometrically measured in the photometric step,
In the photometric step, the amount of energy per unit time and unit area of the laser light applied to the aggregate is 0.001 to 0.005 mW / μm ² .   The analysis method according to claim 7, wherein the laser beam applied to the aggregate has a spot diameter of 100 to 200 μm.

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