WO2005106454A1 - 被検抗原内の生菌を特異的に標識化して検出する検出方法及び検出装置 - Google Patents
被検抗原内の生菌を特異的に標識化して検出する検出方法及び検出装置 Download PDFInfo
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- WO2005106454A1 WO2005106454A1 PCT/JP2005/003584 JP2005003584W WO2005106454A1 WO 2005106454 A1 WO2005106454 A1 WO 2005106454A1 JP 2005003584 W JP2005003584 W JP 2005003584W WO 2005106454 A1 WO2005106454 A1 WO 2005106454A1
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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
- G01N33/569—Immunoassay; Biospecific binding assay; Materials therefor for microorganisms, e.g. protozoa, bacteria, viruses
- G01N33/56911—Bacteria
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/281—Sorbents specially adapted for preparative, analytical or investigative chromatography
- B01J20/286—Phases chemically bonded to a substrate, e.g. to silica or to polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
- B01J20/3231—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the coating or impregnating layer
- B01J20/3242—Layers with a functional group, e.g. an affinity material, a ligand, a reactant or a complexing group
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/6428—Measuring fluorescence of fluorescent products of reactions or of fluorochrome labelled reactive substances, e.g. measuring quenching effects, using measuring "optrodes"
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N21/78—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- 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
- G01N33/58—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving labelled substances
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2220/00—Aspects relating to sorbent materials
- B01J2220/50—Aspects relating to the use of sorbent or filter aid materials
- B01J2220/52—Sorbents specially adapted for preparative chromatography
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2220/00—Aspects relating to sorbent materials
- B01J2220/50—Aspects relating to the use of sorbent or filter aid materials
- B01J2220/54—Sorbents specially adapted for analytical or investigative chromatography
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2220/00—Aspects relating to sorbent materials
- B01J2220/50—Aspects relating to the use of sorbent or filter aid materials
- B01J2220/58—Use in a single column
Definitions
- the present invention relates to a detection method and a detection device for detecting the concentration or number of an antigen in a solution, and in particular, to speed up a test by specifically labeling live bacteria in an antigen.
- TECHNICAL FIELD The present invention relates to a detection method and a detection device capable of speeding up.
- the amount of an antigen is measured by using a change in a physical quantity or the like due to an antigen-antibody reaction without binding a labeling substance such as an enzyme to the antibody, such as a surface plasmon resonance method.
- Antibodies such as unlabeled immunochromatography and radioimmunoassay
- the amount of antigen is measured by measuring the amount of the labeling substance using a substance bound with an enzyme or other labeling substance.
- the "sandwich method (sandwich ELISA method)" which is currently the mainstream because the measurement operation is relatively easy, will be described in detail.
- FIG. 12 is a schematic view showing main steps of a conventional sandwich method.
- A is a step of immobilizing an antibody (primary antibody)
- (b) is a step of capturing a target bacterium (antigen)
- (c) is a step of staining with an enzyme-labeled antibody
- (d) is a step of staining with an enzyme-labeled antibody.
- This is the step of immobilizing the antibody (secondary antibody)
- (e) is the step of eluting the labeled iridani cells
- (f) is the step of detecting the eluted labeled iridani cells.
- FIGS. 12A to 12F show the surface 100 of the immobilization layer, the primary antibody 101, the target bacterium 102, the secondary antibody 103, the labeling substance 104, the light source 105, and the detector 106. .
- a solution containing a primary antibody 101 that specifically binds to pathogenic Escherichia coli O—157 is poured into a reaction vessel in which non-specific adsorption is likely to occur.
- the primary antibody 101 is non-specifically adsorbed on the surface 100 of the immobilization layer to immobilize it (FIG. 12 (a)).
- a sample solution containing the target bacterium 102 is poured into the reaction vessel, and the target bacterium 102 is specifically bound to the immobilized primary antibody 101 in the reaction vessel by an antigen-antibody reaction (FIG. 12 (b)).
- a solution containing the secondary antibody 103 labeled with the labeling substance 104 is poured into a reaction vessel, and the enzyme-labeled antibody comprising the secondary antibody 103 and the labeling substance 104 is reacted. Specific binding is achieved by an antigen-antibody reaction via the target bacterium 102 in the container (FIG. 12 (c)). As a result, an enzyme-labeled antibody in an amount proportional to the target bacterium 102 can be immobilized on the reaction vessel (FIG. 12 (d)).
- a substrate solution containing a coloring substrate is added to the reaction vessel, and the enzyme-labeled antibody is colored by an enzymatic reaction.
- the target bacterium 102 bound with the enzyme-labeled antibody is eluted with a lysis extract such as an aqueous sodium hydroxide solution (FIG. 12 (e)), and then placed opposite the light source 105.
- the detected detector 106 detects light having a wavelength that the dye specifically absorbs, and measures the antigen concentration (FIG. 12 (f)).
- Patent Document 1 discloses a method in which a stationary phase in which a specific binding component capable of specifically binding to Escherichia coli is immobilized is applied to an arbitrary region on the surface of the water-absorbing substrate.
- a detection kit comprising at least a step of developing a substrate solution.
- the detection method and the detection kit by appropriately adjusting the water absorption of the water-absorbent substrate, the speed at which the test liquid and the substrate liquid are developed can be optimized, and thus, the inspection speed can be improved. It is possible to make a quick dagger.
- the chromogenic substrate component specifically binds to the alkaline phosphatase of the live bacteria captured on the stationary phase by the specific binding component to form a color. Therefore, there is an advantage that it is possible to detect even the presence or absence of viable E. coli in the test solution.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2002-165599 (paragraph number [0033] [0037])
- Patent Document 1 the detection method described in Patent Document 1 can speed up the test and detect live bacteria of Escherichia coli, but can handle only a very small amount of sample of 0.2 Olml to 0.2 ml. Therefore, there is a problem that the reliability of the inspection cannot be ensured (see Paragraph No. [0034] of Patent Document 1). In other words, when the amount of the sample to be tested is small, the probability of containing E. coli and the probability of containing viable bacteria in E. coli also decrease. It will be low.
- the present invention has been made in view of the above points, and an object of the present invention is to enable rapid detection of viable bacteria among microorganisms serving as antigens in a short time, and to increase the reliability of the test. Another object of the present invention is to provide a detection method and a detection device that can secure the same.
- the present invention provides a test antigen such as Escherichia coli with a labeled antigen obtained by allowing a labeling substance which is enzymatically decomposed by viable bacteria in the test antigen to act on the antigen. After generation, the labeled antigen is captured in a stationary phase in which a specific binding antibody capable of specifically binding to the test antigen is immobilized.
- the present invention provides the following.
- test antigen and a labeling substance which is enzymatically decomposed by the live bacteria in the test antigen specifically labels and detects the live bacteria in the test antigen.
- a detection method wherein the labeled substance is allowed to act on the test antigen to generate an optically detectable labeled antigen, and a specific binding antibody capable of specifically binding to the test antigen is immobilized.
- a detection method comprising capturing the labeled antigen in a stationary phase.
- the activity of a test antigen such as Escherichia coli and a labeled substance which is enzymatically degraded by the live bacteria among the test antigens is evaluated.
- This is a detection method for detecting labeled antigens, in which a labeled antigen is allowed to act on a test antigen to generate a labeled antigen that can be optically detected by a fluorescence reaction or the like, and the antigen-antibody reaction specifically reacts with the test antigen.
- the capture targets are an optically detectable labeled antigen (live bacteria) and a dead bacterium (fungal fragment) that is not labeled and cannot be detected optically.
- the conventional sandwich method does not require an essential secondary antibody, and as a result, the antigen-antibody reaction, which was required twice in the past, can be performed only once. Can be.
- the only optically detectable antigen is a live bacterium serving as the labeling antigen, so that it is possible to detect live bacteria Z and dead bacteria separately. Viable bacteria causing food poisoning damage can be accurately detected.
- the amount of sample handled by the detection method according to the present invention is several tens ml- Since the sample volume is several hundred ml, it is possible to prevent a decrease in the probability of containing the test antigen due to sample extraction, thereby preventing a decrease in detection accuracy and detection sensitivity and ensuring test reliability. it can.
- a detection method comprising capturing the labeled antigen grown by a growth medium in the stationary phase.
- the labeled antigen grown in the growth medium is captured, so that the concentration of the labeled antigen can be increased as compared to before the addition of the growth medium.
- the probability of capturing the labeled antigen can be improved, and the detection accuracy and the detection sensitivity can be increased.
- a detection method comprising capturing the circulated labeled antigen in the stationary phase while circulating the sample solution containing the labeled antigen a plurality of times.
- the circulating labeled antigen is captured in the stationary phase while the sample solution containing the labeled antigen is circulated a plurality of times.
- the sample solution can be brought into contact with the immobilized stationary phase a plurality of times, so that the probability of capturing the labeled antigen can be improved, and the detection accuracy and the detection sensitivity can be improved.
- test antigen is captured in a plurality of stationary phases formed by immobilizing a specific binding antibody capable of specifically binding to each of the plurality of test antigens.
- a detection method characterized in that:
- the test antigens are collectively captured at one time in a series of test flows, the test can be speeded up and efficiency can be improved.
- a detection device having a column capable of installing a stationary phase formed by solid-binding a specific binding antibody capable of specifically binding to a test antigen, wherein the column is provided with the stationary phase. 5. A detection device, wherein the test antigen captures a labeled antigen labeled.
- a column in which a stationary phase formed by immobilizing a specific conjugate capable of specifically binding to a test antigen (including live bacteria and dead bacteria) such as Escherichia coli can be installed.
- a column on which the stationary phase described above is installed captures labeled antigens in which the test antigen is labeled by the labeled antigens acting only on viable bacteria.
- a single antigen-antibody reaction is sufficient before capturing the targeted antigen, which enables rapid testing and enables accurate detection of viable bacteria causing food poisoning damage.
- the detection device further comprising a stirring device for stirring the liquid, wherein the labeled antigen is labeled by the stirring device.
- the above-described detection device further includes a stirring device for mechanically stirring the liquid (sample solution), and the above-described labeled antigen is added to the labeling antigen in the stirring device. Therefore, the labeling of the test antigen can be promoted, and the labeled antigen can be efficiently produced.
- the above-mentioned column can be used a plurality of times, a plurality of microbiological tests can be continuously and efficiently performed.
- a detection device having a plurality of columns capable of installing a stationary phase formed by solid-binding a specific binding antibody capable of specifically binding to a test antigen, wherein the stationary phase is installed.
- a detection device having a plurality (a plurality of types) of columns on which a stationary phase formed by solidifying a specific binding antibody capable of binding specifically to a test antigen can be provided. Since the labeled antigen in which the test antigen is labeled is captured by using a plurality of columns provided with a stationary phase, the test can be performed quickly and efficiently.
- a biocolumn provided with a stationary phase in which a specific binding antibody capable of specifically binding to a test antigen is immobilized.
- the test can be further speeded up. 'I can make sure.
- a storage means such as a freeze-drying method, the biocolumn can be stored in a stable state for a long time.
- the antigen-antibody reaction which was conventionally required twice, can be performed only once, so that the test can be performed quickly. Since the antigens to be detected are labeled antigens (live bacteria), it is possible to distinguish between live bacteria and dead bacteria. Furthermore, since a large number of samples can be handled, the reliability of the test can be ensured. You can do it.
- FIG. 1 is an external view of a detection device 1 according to an embodiment of the present invention.
- a detection device 1 has a pump and a valve inside.
- a biocolumn 2 provided with a stationary phase for capturing a target bacterium is provided on a side surface of a box-shaped control box having the following.
- An M-Cell 3 containing a lysate that elutes the captured target bacterium is installed next to the No. 2 column.
- FIG. 2 is an enlarged view of the biocolumn 2 installed in the detection 1 according to the embodiment of the present invention.
- the biocolumn 2 is prepared by filling glass beads for a biocolumn into glass beads capable of capturing an antigen by an antigen-antibody reaction.
- the glass beads are pre-treated with an aqueous sodium hydroxide solution or hydrochloric acid, and then dried overnight. Then, the glass beads are subjected to a sintering treatment and a silyllizing treatment with a silylating agent, rinsed, and dried at room temperature to produce silylated glass beads.
- silylated glass beads is filled in a glass tube for a biocolumn. Then, it is immersed for several minutes in a dartartaldehyde solution containing dartartaldehyde as a coupling agent, washed with a phosphate buffer solution, and then subjected to a primary antibody immobilization treatment by non-specific adsorption. In the primary antibody immobilization treatment, the unreacted primary antibody is removed by appropriately washing the glass tube for the biocolumn.
- a blocking solution containing sialic albumin serum as a blocking agent is injected, and the blocking agent is non-specifically applied to the non-specific adsorption surface remaining on the surface of the glass beads. Adsorb and prevent subsequent non-specific adsorption of other organic substances.
- the inside of the glass tube for the biocolumn is washed a plurality of times with a phosphate buffer or the like to remove the unreacted blocking agent, whereby the Noocolumn 2 is produced.
- a storage means such as a freeze-drying method, for example, the biocolumn 2 can be stored in a stable state for a long time.
- the present invention is not limited to this.
- a silylation treatment, a coupling treatment, etc. Uses relatively easy-to-handle flat glass to establish various conditions It may be good.
- spherical glass beads are used.
- glass beads are one of carriers for immobilizing antibodies (a matrix for immobilizing antibodies), and are used for immobilizing antibodies.
- the carrier may have any shape as long as the carrier has a surface area as much as possible and the antibody and the sample can be sufficiently brought into contact with the sample in a state where the column is packed.
- the production process is almost the same as the production process of the Noo column 2 using the glass beads described above, and thus the description thereof is omitted.
- the present invention is applicable irrespective of the material of the beads, the silylation treatment conditions, and the method of immobilizing the primary antibody, as long as the primary antibody can be immobilized on the surface of the immobilization layer.
- FIG. 3 is a flow path system diagram when performing a microorganism test using the detection device 1 shown in FIG.
- FIG. 4 is a flowchart schematically showing an inspection process in the flow path diagram shown in FIG.
- 6-carboxylfluorescein diacetate, a dilution (CFDA dilution) solution solution containing a labeling substance
- CFDA dilution a dilution solution
- a test sample for example, 100 ml
- a test antigen containing a mixture of live bacteria (labeled antigen) and dead dead bacteria that have not been hydrolyzed is injected into bottles B5 and B6.
- a phosphate buffer solution as a column washing solution is injected, and an alkaline aqueous solution that elutes target bacteria captured in the biocolumn 2 is injected into M-Cell3.
- CFDA used in the present embodiment can be used as an agent capable of staining viable bacteria and detecting them by fluorescence or the like.
- Step Sl the fixing step is performed (Step Sl). More specifically, in Fig. 3, by operating the pump P1, the addition test of the CFDA diluent injected into the bottle B1 changes the bottle Bl ⁇ valve Vl ⁇ valve V2 ⁇ pump Pl ⁇ valve 3 ⁇ biocolumn. Flows in the order of 2 ⁇ valve 4 ⁇ valve 5 ⁇ valve 6 ⁇ bottle B2. The required time is about 15 minutes.
- the sampled water stored in bottle B2 and flowing into the bottle B2 is detected as bottle B2 ⁇ valve Vl ⁇ valve V2 ⁇ pump Pl ⁇ valve V3 ⁇ biopower ram 2 ⁇ valve 4 ⁇ valve 5 ⁇ valve 6 ⁇ Flow in the order of bottle B3. This takes about 15 minutes.
- the biocolumn 2 glass
- the test antigen in the sample is specifically bound to the primary antibody immobilized on the beads by an antigen-antibody reaction.
- a growth culture solution may be added to the bottle B1, and the labeled antigen grown by the growth culture solution may be captured. Thereby, the concentration of the labeled antigen can be increased, and the probability of capturing the labeled antigen can be improved.
- the stationary phase (glass beads) in which the specific binding antibody is immobilized and the circulating sample solution (sample) are sufficiently used. They must be in contact. Therefore, in this embodiment, the glass beads (stationary phase) in the Noo column 2 are effectively agitated using an electromagnetic pinch valve PV (see FIG. 3)! More specifically, this will be described with reference to FIG. FIG. 5 is an explanatory diagram showing how the stationary phase is effectively stirred.
- the pinch valve PV is opened and closed at a predetermined timing, so that the stationary phase (glass beads) is periodically and effectively. It is configured to be stirred. This makes it possible to bring the stationary phase (glass beads) into contact with the sample sufficiently.
- the electromagnetic pinch valve PV is used.
- the present invention is not limited to this.
- a manual or electric pinch valve may be used.
- any means may be used as long as the stationary phase in the biocolumn 2 has an effect of being appropriately stirred, and is not particularly limited to a pinch valve.
- a cleaning step is performed (Step S2). More specifically, in Figure 3, by switching the valve V2, the phosphate buffer power stored in bottle B5 bottle 5 ⁇ valve 2 ⁇ pump Pl ⁇ valve V3 ⁇ biocolumn 2 ⁇ valve V4 ⁇ Flow in the order of valve V5 ⁇ bottle 4. Then, switch off the pump P1. It takes about 15 minutes.
- the washing step in step S2 the phosphate buffer is passed through the biocolumn 2 to wash unreacted primary antibodies and the like, and condensate the test antigen as a result.
- Step S3 an elution step is performed (Step S3). More specifically, in FIG. 3, by switching valve V3 and valve V4 and activating M-Cell3 containing the lysate for eluting the antigen to be tested and pump P2, the sample captured in biocolumn 2 was changed. Elute the test antigen. Then, a fluorescent spectrophotometer equipped with a flow cell (lower right in FIG. 3) optically detects (spectrum measurement) labeled live bacteria (labeled antigen) among the test antigens. Through the elution step of step S3, only viable bacteria causing food poisoning damage are detected. Then, the microbial examination is temporarily terminated by a series of steps from step S1 to step S3.
- step S4 When a microbe test is continuously performed by injecting a chemical solution for several experiments into bottle B4 or bottle B6, a washing step is additionally performed as shown in Fig. 4 (step S4). More specifically, in FIG. 3, the pump P2 is operated, the valve V4 and the valve V7 are switched, and the biocolumn 2 is washed with the phosphate buffer stored in the bottle B6.
- Step S4 As described above, according to the series of detection steps from Step S1 to Step S3 (Step S4) shown in FIG. 4, it can be seen that only viable bacteria can be detected from microorganisms as antigens.
- the amount of water that can be tested by the detection device 1 according to the embodiment of the present invention is different from the amount of water to be used in a test kit or the like (about 0.2 ml—0.2 ml), and several tens ml— Since it is several hundred ml, it is possible to prevent a decrease in the probability of containing Escherichia coli caused by sample siding of the sample, and to improve detection accuracy and detection sensitivity.
- the chemicals used in each of the steps of washing, elution, and washing and the method thereof can be changed without departing from the spirit of the present invention.
- step S4 the microorganism test can be performed in a shorter time than the conventional sandwich method. Detector
- a quick test using the method 1 with reference to the schematic diagram of FIG.
- FIG. 6 is a schematic diagram showing main steps of the detection method according to the embodiment of the present invention.
- (a) is the step of immobilizing the antibody (primary antibody)
- (b) is the step of stirring the sample solution containing the test antigen and the fluorescent reagent
- (c) is the test antigen containing the labeled antibody.
- (D) is the step of immobilizing the test antigen
- (e) is the step of eluting the test antigen
- (f) is the step of immobilizing the labeled antigen among the eluted test antigens. This is a detection step for detecting only the antigen.
- 6 (a)-(f) show the surface of the immobilization layer 10, the primary antibody 11, the target bacteria (live bacteria) 12, the labeled substance 13, the labeled antigen 14, the light source 15, and the detector 16. Has been described.
- the primary antibody 11 is non-specifically adsorbed on the surface 10 of the immobilization layer of the glass beads filled in the glass column for a Noyo column, and immobilization is performed (FIG. 6 (a)).
- the details of this step are as described in the preparation step of the biocolumn 2.
- the bacterium 12 as a target bacterium is caused to emit light (FIG. 6 (b)). More specifically, when the diluted CFDA solution is added to the sample solution, live bacteria among the test antigens absorb CFDA (labeling substance 13), which is an intracellular pH indicator, and hydrolyze. It becomes fluorescent by decomposition. That is, CFDA has a function as a viable stain. After the CFDA diluent is added to the sample solution, the hydrolysis by viable bacteria may be promoted by stirring with a stirrer. As a result, CFDA can be absorbed into living bacteria in a shorter time and more reliably, thereby contributing to quick inspection.
- CFDA labeling substance 13
- a sample solution containing the test antigen (including the labeled antigen 14) is brought into contact with the surface 10 of the immobilized layer of the biocolumn 2, and the test solution is subjected to an antigen-antibody reaction with the primary antibody 11. Capture the antigen (Fig. 6 (c)). After capturing the test antigen, a washing solution such as a phosphate buffer is poured into the biocolumn 2 to remove impurities, unreacted primary antibodies, etc., thereby condensing (concentrating) the test antigen and The test antigen is fixed (Fig. 6 (d)).
- test antigen immobilized by the primary antibody 11 and containing the labeled antigen 14 is lysed and extracted with an aqueous solution of Arikari (FIG. 6 (e)).
- concentration in the lysate extract can be increased by reducing the volume in the circulation path and the flow cell, and by reducing the amount of alkaline aqueous solution required for lysis * extraction, thereby improving detection sensitivity. be able to.
- a test antigen can be lysed and extracted more quickly and reliably by using a force using a high-concentration alkaline aqueous solution, for example, an acidic buffer solution / surfactant in combination. .
- the labeled antigen 14 is optically detected by the detector 16 arranged opposite to the light source 15 (FIG. 6 (f)). More specifically, the labeled antigen 14 containing the labeling substance 13 emits fluorescent light by ultraviolet excitation light emitted from the light source 15 and is received by the detector 16 having a condenser lens to generate an electric signal. (Chromatographic signal). By measuring and analyzing the electric signal, the labeled antigen 14 (target bacterium 12) can be optically detected.
- the detection mode does not matter, for example, a force using a fluorescence spectrophotometer.
- a detector such as a particle counter is used.
- a microorganism test can be performed in a shorter time than in the conventional sandwich method. That is, in the conventional San Deutsch method, two antigen-antibody reactions were required before detection of the test antigen (see FIGS. 12 (b) and 12 (c)). Since only one antigen-antibody reaction between the antigen 14 and the primary antibody 11 is required (see FIG. 6 (c)), the test time can be reduced by that much, and the test can be performed quickly. Can be planned.
- FIG. 7 is an external view of a detection device according to another embodiment of the present invention.
- the main feature is that two Noo columns 65 and 66 that can capture specific target bacteria are provided.
- the force of providing two biocolumns 65 and 66 is not limited to this.
- three or more biocolumns may be provided.
- Providing multiple biocolumns enables simultaneous detection of multiple types of target bacteria
- each device such as a 'pump' bottle is installed inside a constant temperature bath (square frame in the drawing) at 35 ⁇ 1 ° C.
- the respective devices and pumps are optimally controlled by the flow path control sequencer 69.
- a test sample supply tank containing the target bacteria (sample hopper) 61, a stirrer for stirring the sample (magnetic stirrer) 62, a filtration filter 63 for removing impurities, and a flow path switch for switching the flow paths appropriately
- a valve 64, biocolumns 65 and 66 filled with fine particle glass with the target bacteria antibody fixed on the surface, a circulating pump 67 for flowing the sample, and a high-sensitivity fluorescence detector 68 for optically detecting the target bacteria are installed.
- a bottle B11 containing a washing solution, a bottle B12 containing a fixative solution, and a bottle B13 containing a lysate of a captured stained bacterium are provided.
- the inspection process using the detection device shown in FIG. 7 will be outlined.
- a specified amount of a sample is striked by a standard method, and a test solution (50 to 100 ml) is put into a test sample supply tank 61. Then, while stirring with the stirrer 62, CFDA as a fluorescent staining reagent is added to stain live bacteria. After stirring for about 10 minutes, the impurities are removed through the filtration filter 63 and introduced into the sample channel (biocolumn 65). Switch the flow path switching valve 64 to the filter back washing system, and wash the filtration filter 63.
- the test solution that has passed through the filtration unit passes through the biocolumns 65 and 66, and circulates through all the washing channels in the biocolumns 65 and 66. Pass through.
- the stained bacterial cells (labeled antigen) captured by the immobilized antibody were re-used several times by recycling the lysed extract added in small amounts to the recycling channel in the biocolumns 65 and 66 using the bottle B13. Extracted to high concentration.
- the test solution from which extraction has been completed is introduced into the high-sensitivity fluorescence detector 68 by the switching valve 64 below the biocolumns 65 and 66, and a chromatogram is drawn as an electric signal.
- the test solution from which extraction has been completed is introduced into the flow cell of the high-sensitivity fluorescence detector 68, and the stained bacterial cells in the sample solution are fluoresced by ultraviolet excitation light emitted from the light source. Emits. Then, the fluorescent light is received by a condenser lens, and an optical signal is converted into an electric signal, whereby a chromatogram is drawn.
- the detection method according to the embodiment of the present invention can sufficiently detect a target bacterium without a culturing step. However, more reliable test results can be obtained by culturing the target bacteria as necessary.
- the culturing step is performed, for example, by providing a heater in the detection device and performing culturing before the fixing step, or by culturing the entire detection device in which the inspection process is incorporated at a constant temperature. can do.
- FIG. 8 is a diagram showing the measurement results when a performance experiment of the biocolumn 2 was performed in the flow channel system shown in FIG. More specifically, it shows the CFDA fluorescence intensity with respect to the injection amount (CFUZlOOml) of E. coli.
- CFUZlOOml injection amount
- FIG. 8 shows the CFDA fluorescence intensity with respect to the injection amount (CFUZlOOml) of E. coli.
- CFUZlOOml injection amount
- FIG. 10 is a table showing measurement results when a performance experiment of the biocolumn 2 was performed in the flow channel system shown in FIG.
- FIG. 10 (a) shows the CFDA fluorescence intensity for the dead bacteria subjected to the staining treatment.
- the CFDA fluorescence intensity in the lysed extract was very weak. That is, even if dead bacteria that do not directly cause food poisoning are mixed in the actual test water, viable bacteria can be evaluated with high accuracy without any interference, and only dead bacteria can be detected. It can be seen that the problem of eliminating conforming products, including, for example, can be solved.
- Fig. 10 (b) shows CFDA versus injection amount (CFUZlOOml) of multiple types of bacteria other than E. coli (E. coli: C. freundii, Enterobacteriaceae: S. marcescens). Shows the fluorescence intensity. According to the table shown in FIG. 10, it can be seen that the lysis extract has a low CFDA fluorescence intensity for bacteria other than E. coli. In other words, similarly to dead bacteria, even when bacteria other than the target bacteria coexist in the sample solution, the effect can be relatively low.
- FIG. 11 is a table showing measurement results when performance tests of the biocolumn 2 by repeated use were performed in the flow channel system shown in FIG. More specifically, it shows the CFDA fluorescence intensity with respect to the cumulative number of uses (times) of the biocolumn 2.
- FIG. 11 it can be seen that when the biocolumn 2 is used twice cumulatively, the CFDA fluorescence intensity in the lysed extract decreases by about 98% at the second use. This is because a high concentration of alkali having a lytic action is used for extraction of the target bacterium.
- the antibody which is a protein, is damaged together with the bacterium. Therefore, for example, by using a lysate extract that causes less damage to the antibody, the biocolumn 2 can be used multiple times.
- 100 ml of the bacterial solution whose number of bacteria is estimated by the MPN method or the like is transferred to a sample supply bottle of a test device, and 1 ml of a viable bacterial staining solution containing CFDA is added. After circulating twice through the biocolumn, drain. Then, after applying the entire amount of the sample solution to the biocolumn, an appropriate amount of the biocolumn washing solution is flowed, and after the inside of the biocolumn is washed, the flow path is switched and all the biocolumn washing solution remaining inside the biocolumn is removed.
- the target bacteria stained with live bacteria in the above-described steps and trapped in the biocolumn were lysed and extracted using a lysis extract of a total amount of 1 Oml, and introduced into the flow cell of the fluorescence spectrophotometer. Measurement. Then, after the measurement is completed, all the channel systems are washed with sterile phosphate buffered diluted water V.
- the detection method and the detection device according to the present invention detect a labeled antigen obtained by allowing a labeled substance that is enzymatically decomposed by viable bacteria in the test antigen to act on the test antigen, thereby detecting the sample.
- the viable bacteria in the solution can be used as target bacteria, and are useful as those that can ensure quickness and certainty of the test.
- FIG. 1 is an external view of a detection device according to an embodiment of the present invention.
- FIG. 2 is an enlarged view of a biocolumn installed in the detection device according to the embodiment of the present invention.
- FIG. 3 is a flow path diagram when performing a microorganism test using the detection device shown in FIG. 1.
- FIG. 4 is a flowchart showing an outline of an inspection process in the flow path diagram shown in FIG. 3.
- FIG. 5 is an explanatory view showing how a stationary phase is effectively stirred.
- FIG. 6 is a schematic view showing main steps of a detection method according to an embodiment of the present invention.
- FIG. 7 is an external view of a detection device according to another embodiment of the present invention.
- FIG. 8 is a view showing measurement results when a performance experiment of a biocolumn was performed in the flow channel system shown in FIG. 3.
- FIG. 9 is a diagram in which each data of the table shown in FIG. 8 is plotted in a two-dimensional field.
- FIG. 10 is a table showing measurement results when performing a performance experiment on a biocolumn in the flow channel system shown in FIG. 3.
- FIG. 11 is a table showing measurement results of performance tests of a biocolumn by repeated use in the flow channel system shown in FIG. 3.
- FIG. 12 is a view showing main steps of a conventional sandwich method.
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US11/587,846 US20070218500A1 (en) | 2004-04-28 | 2005-03-03 | Method and Apparatus for Detection of Live Bacterium Within Test Subject Through Specifically labeling Thereof |
JP2006512729A JPWO2005106454A1 (ja) | 2004-04-28 | 2005-03-03 | 被検抗原内の生菌を特異的に標識化して検出する検出方法及び検出装置 |
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JP2021518559A (ja) * | 2018-03-20 | 2021-08-02 | サノフィ パスツ−ル リミテッドSanofi Pasteur Limited | 固有蛍光を使用して、アジュバント化タンパク質濃度及びパーセント吸着を決定する方法 |
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US8012770B2 (en) | 2009-07-31 | 2011-09-06 | Invisible Sentinel, Inc. | Device for detection of antigens and uses thereof |
CA2777061C (en) | 2009-10-09 | 2018-06-19 | Invisible Sentinel, Inc. | Device for detection of analytes and uses thereof |
AU2012211141B2 (en) | 2011-01-27 | 2016-11-03 | Invisible Sentinel, Inc. | Analyte detection devices, multiplex and tabletop devices for detection of analytes, and uses thereof |
EP2823308B1 (en) | 2012-03-09 | 2019-05-22 | Invisible Sentinel, Inc. | Methods and compositions for detecting multiple analytes with a single signal |
Citations (4)
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JP2002165599A (ja) * | 2000-11-30 | 2002-06-11 | Nitto Denko Corp | 大腸菌生菌体の検出方法およびそれに用いる検出用キット |
JP2003083975A (ja) * | 2001-09-10 | 2003-03-19 | Nitto Denko Corp | 免疫測定法用試験片および免疫測定法 |
JP2003227830A (ja) * | 2001-11-06 | 2003-08-15 | Aventis Behring Gmbh | 生物流体を研究するための検査システム |
JP2003270248A (ja) * | 2002-03-19 | 2003-09-25 | Showa Seiki Kk | 抗原検出システム |
-
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- 2005-03-03 CN CNA2005800138909A patent/CN1989413A/zh active Pending
- 2005-03-03 JP JP2006512729A patent/JPWO2005106454A1/ja not_active Withdrawn
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JP2002165599A (ja) * | 2000-11-30 | 2002-06-11 | Nitto Denko Corp | 大腸菌生菌体の検出方法およびそれに用いる検出用キット |
JP2003083975A (ja) * | 2001-09-10 | 2003-03-19 | Nitto Denko Corp | 免疫測定法用試験片および免疫測定法 |
JP2003227830A (ja) * | 2001-11-06 | 2003-08-15 | Aventis Behring Gmbh | 生物流体を研究するための検査システム |
JP2003270248A (ja) * | 2002-03-19 | 2003-09-25 | Showa Seiki Kk | 抗原検出システム |
Cited By (2)
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JP2021518559A (ja) * | 2018-03-20 | 2021-08-02 | サノフィ パスツ−ル リミテッドSanofi Pasteur Limited | 固有蛍光を使用して、アジュバント化タンパク質濃度及びパーセント吸着を決定する方法 |
JP7413271B2 (ja) | 2018-03-20 | 2024-01-15 | サノフィ パスツ-ル リミテッド | 固有蛍光を使用して、アジュバント化タンパク質濃度及びパーセント吸着を決定する方法 |
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US20070218500A1 (en) | 2007-09-20 |
CN1989413A (zh) | 2007-06-27 |
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