CN204405680U - Detect the test strips of Procalcitonin - Google Patents
Detect the test strips of Procalcitonin Download PDFInfo
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- CN204405680U CN204405680U CN201520103122.3U CN201520103122U CN204405680U CN 204405680 U CN204405680 U CN 204405680U CN 201520103122 U CN201520103122 U CN 201520103122U CN 204405680 U CN204405680 U CN 204405680U
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- procalcitonin
- test strips
- antibody
- binding regions
- analyte binding
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- 108010048233 Procalcitonin Proteins 0.000 title claims abstract description 28
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Landscapes
- Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
Abstract
The utility model provides a kind of test strips detecting Procalcitonin, it is characterized in that, comprise the ingredient that following order overlaps successively: for the sample reception district of sample reception, be coated with by the first analyte binding regions of the first antibody of quantum dot-labeled anti-Procalcitonin, be coated with the second analyte binding regions of the first antibody of the anti-Procalcitonin marked by rare-earth luminescent material, there is the sample detection district of spaced detection zone and quality control band, wherein said detection zone is fixed with the second antibody of anti-Procalcitonin, described quality control band is fixed with the antibody of against murine IgG, and suction zones.The fluorescence immune chromatography reagent card of quantitative detection Procalcitonin provided by the utility model can have the advantage of high sensitivity, low error range simultaneously.
Description
Technical field
The utility model relates to a kind of test strips detecting Procalcitonin.
Background technology
Procalcitonin is the precursor glycoprotein of hormone calcitonin.At present, in the world using Procalcitonin as the monitoring index evaluating clinical infection degree and serious disease.It is generally acknowledged, the biological effect of Procalcitonin is mainly: the effect of secondary inflammatory factor, the effect of chemotactic factor (CF), anti-inflammatory and protective effect etc.Inflammatory reaction is after about 3 hours, and the level of Procalcitonin in blood plasma raises, and within 6-8 hour, reach mxm., but when autoimmunity, allergy and virus infections, Procalcitonin can not raise, and therefore can distinguish viral and germ sexuality dye, direction of medication usage.Bacteriological infection person Serum Procalcitonin Concentrations and the positive correlation of the infection order of severity, Procalcitonin Concentrations declines and then points out disease relapse.Procalcitonin Half-life in vivo is 20-24 hour, can be used for the course of disease and the prognosis of clinical monitoring bacteriological infection and septicemia.
For the detection of Procalcitonin, detection method conventional at present comprises: euzymelinked immunosorbent assay (ELISA), chemoluminescence method, latex enhancing immune turbidimetry, colloidal gold immunity chromatography, fluorescence immune chromatography method etc.Euzymelinked immunosorbent assay (ELISA) and chemoluminescence method detection sensitivity high, can accurate quantitative analysis be realized, but it is consuming time long, and this instant mensuration of single increment cannot be carried out.Though latex enhancing immune turbidimetry can realize high flux screening, due to the restriction of methodology itself, its detection sensitivity is lower, cannot carry out Accurate Measurement to low value sample.Colloidal gold immunity chromatography is simple to operate, without the need to special instrument and equipment, but can only realize sxemiquantitative.In fluorescence immune chromatography method, though organic fluorescent compounds such as fluorescein isothiocyanate (fitc), the rhodamine fluorescent dye etc. of tradition application have very high sensitivity in aqueous, but during the biological sample immune analysis determination such as serum, body fluid, cell for complexity after its labelled antibody or antigen, once the substrate concentration to be checked in sample in low concentration of water at ordinary times, the concentration of coexistent impurity will be much higher than substrate concentration to be checked.Now, the coexistent impurity reasons for its use fluorescence of high concentration will cause serious interference to the fluorometric assay of immune product, and then significantly reduces the sensitivity of fluorescence immunoassay, this greatly limits its application in clinical diagnosis field.
A kind of test strip that can realize Procalcitonin Accurate Measurement is lacked in prior art.Therefore, need to provide a kind of novel procalcitonin detection test strip.
technical scheme
On the one hand, the utility model provides a kind of test strips detecting Procalcitonin, it is characterized in that, comprises the ingredient that following order overlaps successively:
A) for the sample reception district of sample reception,
B) be coated with by the first analyte binding regions of the first antibody of quantum dot-labeled anti-Procalcitonin,
C) the second analyte binding regions of the first antibody of the anti-Procalcitonin marked by rare-earth luminescent material is coated with,
D) have the sample detection district of spaced detection zone and quality control band, wherein said detection zone is fixed with the second antibody of anti-Procalcitonin, described quality control band is fixed with the antibody of against murine IgG, and
E) suction zones.
In one embodiment, described test strips comprises base plate further, and wherein said sample reception district, the first analyte binding regions, the second analyte binding regions, sample detection district and suction zones are bonded on base plate and also sequentially overlap successively.
In one embodiment, described quantum dot is microspheres form and has the particle size range of 2nm-30nm, and described quantum dot is selected from following group: CdTe, CdSe, PbSe, InP and GaN.
In one embodiment, described second analyte binding regions is coated with microballoon further, wherein said micro-ball load has described rare-earth luminescent material and described first antibody.
In one embodiment, the particle size of described microballoon is 50nm-400nm.
In one embodiment, the particle size of described microballoon is 100nm-300nm.
In one embodiment, the particle size of described microballoon is 100nm or 300nm.
In one embodiment, be interposed between 0.3cm to 0.5cm between described detection zone and described quality control band.
In one embodiment, the width of described test strips is between 0.2cm to 0.5cm.
beneficial effect
The test strips of detection Procalcitonin provided by the utility model has high sensitivity simultaneously, the range of linearity is good, and the advantage of low error range.
Utility model content
technical matters
Accompanying drawing explanation
The side-looking structural representation of Fig. 1 test strips of the present utility model.
The plan structure schematic diagram of Fig. 2 test strips of the present utility model.
Reference numeral:
1-sample reception district, 2-first analyte binding regions, 3-second analyte binding regions, 4-sample detection district, 5-suction zones, 6-base plate, 7-quantum dot (microballoon), 8-rare-earth luminescent material, 9-detection zone and 10-quality control band.
Embodiment
Hereinafter come with reference to the accompanying drawings to describe illustrative embodiments in more detail.Described accompanying drawing is used for illustrating the utility model, but not is limited.
Fig. 1 is the side-looking structural representation of test strips of the present utility model.
As shown in Figure 1, the test strips be arranged on base plate 6 comprises analyte binding regions 3, analyte binding regions 2, second, sample reception district 1, first, sample detection district 4 and suction zones 5.
Sample reception district 1 for receiving sample, its can by being selected from glass fibre element film or polyester film, cotton fine material makes, be preferably made up of glass fibre element film.The effect of sample filtering can be played by sample reception district 1.Such as, when detected sample is blood plasma, serum, sample reception district 1 can graininess insolubles in filtered sample, removes impurity interference unnecessary when detecting thus, improves and detect degree of accuracy.
First analyte binding regions 2 is coated with the first antibody of the anti-Procalcitonin marked by quantum dot 7.Quantum dot is made up of semiconductor material, stable diameter at the nano particle of 2nm-30nm, usually present microspheroidal.The electronics of quantum dot and hole are by quantum confinement, and continuous band structure becomes the discrete energy levels structure with molecular characterization, so quantum dot can emitting fluorescence after being excited.Quantum dot is adopted to carry out degree of accuracy and the sensitivity that labelled antibody can improve detection greatly.In one embodiment, described quantum dot has the particle diameter of 2nm-30nm.In a preferred embodiment, described quantum dot has the particle diameter of 2nm-20nm.In a preferred embodiment, described quantum dot has the particle diameter of 5nm-20nm.In one embodiment, described quantum dot is II-VI group quantum dot (as CdTe, CdSe etc.).In another embodiment, described quantum dot is iii-v quantum dot (as InP, GaN etc.).In another embodiment, described quantum dot is group IV-VI quantum dot (as PbSe etc.).
Second analyte binding regions 3 is coated with the first antibody of the anti-Procalcitonin marked by rare-earth luminescent material 8.In test strips of the present utility model, the first antibody being coated on the anti-Procalcitonin on the first analyte binding regions 2 and the second analyte binding regions 3 is identical antibody, and difference is only that it is marked by quantum dot 7 and rare-earth luminescent material 8 respectively.
In the utility model, term " mark " comprises employing chemistry or physical method makes the first antibody of anti-Procalcitonin directly be connected with quantum dot and rare-earth luminescent material.But mark also can be completed by alternate manner, the first antibody of such as rare-earth luminescent material and anti-Procalcitonin is by such as embedding or the mode of load on microballoon reach the object of " mark " simultaneously.Therefore, in one embodiment, the second analyte binding regions 3 can have microballoon (not shown) further, on described microballoon, embedding or load have the first antibody of rare-earth luminescent material and anti-Procalcitonin simultaneously.In one embodiment, embedding or can have chemistry between the rare-earth luminescent material of load on described microballoon and the first antibody of anti-Procalcitonin and connect, such as, be present on described microballoon with the form of the first antibody of the anti-Procalcitonin of rare-earth luminescent material mark.In another embodiment, embedding or can not have chemistry between the rare-earth luminescent material of load on described microballoon and the first antibody of anti-Procalcitonin and connect, namely on described microballoon, embedding or load have to each other without the rare-earth luminescent material of chemistry connection and the first antibody of anti-Procalcitonin.
In one embodiment, described microballoon can be polymer microballoon, such as polystyrene microsphere.In one embodiment, the particle size scope of microballoon, between 50nm-400nm, preferably between 100nm-300nm, is more preferably 100nm or 300nm.
The method preparing rare-earth fluorescent microballoon is that prior art is known, includes but not limited to: investment, namely in the polymerization process of polymer microballoon, adds rare earth material complex; Bonding method, even if there is coordination reaction in the functional group on rare earth element ion and polymer lateral chain obtains rare-earth fluorescent microballoon; And swelling method and cladding process.Latter two method is all on the basis of monodispersed microballoon (as: polystyrene microsphere), by the infiltration of rare earth material complex or the inside or the surface that are coated on microballoon, by controlling reaction conditions, can realize finally preparing the polymer microballoon that monodispersity is good, fluorescence intensity is high, fluorescent stability is good.
Rare-earth luminescent material comprises lanthanide series-lanthanum (La) in the periodic table of chemical element, cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), lutetium (Lu), and with closely-related two the element-scandiums (Sc) of 15 elements of group of the lanthanides and yttrium (Y) totally 17 kinds of elements.Relative to traditional fluorescent material, rare-earth luminescent material has the spectrum that receptivity is strong, conversion ratio is high and can launch from ultraviolet to infra-red range, has very strong emissive ability in visible region, and the advantages such as stable physical property.In one embodiment, described rare-earth luminescent material is one or several in fluorescent material containing the various lanthanide series such as europium (Eu) ion, terbium (Tb) ion, samarium (Sm) ion, neodymium (Nd) ion, dysprosium (Dy) ion.In another embodiment, rare-earth luminescent material is that one or several in rare-earth luminescent material containing the various lanthanide series such as europium (Eu) ion, terbium (Tb) ion, samarium (Sm) ion, neodymium (Nd) ion, dysprosium (Dy) ion load to the rare-earth fluorescent microballoon that microballoon is formed.Rare-earth luminescent material is loaded to the stability that microballoon can further improve fluorescence.
Although antibody quantum dot-labeled is separately highly sensitive, the range of linearity is not good, is presented as that high level detects inaccurate.Although the antibody of independent rare-earth luminescent material mark possesses the good range of linearity, sensitivity haves much room for improvement, and is presented as that low value detects inaccurate.The utility model coupling quantum dot and rare-earth luminescent material, quantum dot-labeled thing is conducive to the detection of low value to reach the requirement of sensitivity, and rare-earth luminescent material label makes the range of linearity detected can cover high level region.
Sample detection district 4 has spaced detection zone 9 and quality control band 10, and wherein detection zone 9 is fixed with the second antibody of anti-Procalcitonin, quality control band 10 is fixed with the antibody of against murine IgG.Distance between detection zone 9 and quality control band 10 can between 0.05cm to 0.8cm.In one embodiment, be interposed between between detection zone 9 and quality control band 10 between 0.1cm to 0.6cm, preferably between 0.3cm to 0.5cm.
Suction zones 5 can be made up of the material being selected from by velveteen, glass, is preferably made up of velveteen.
The entire length of test strips is between 8cm to 10cm, and overall width, between 0.2cm to 0.5cm, preferably between 0.2cm to 0.3cm, most preferably is 0.3cm.Test strips of the present utility model is being provided sensitivity and while detecting the range of linearity, can reduced the consumption of antibody, greatly saved production cost by the length and/or width reducing test strips.
Fig. 2 is the side-looking structural representation of test strips of the present utility model.No longer repeated description is carried out to content identical with Fig. 1 in Fig. 2.
Test strips of the present utility model has at least following plurality of advantages:
1) problem that the low value sensitivity that the coupling of quantum dot and rare-earth luminescent material label overcomes existence in the detection of current Procalcitonin cannot take into account with the detection range of linearity;
2) independent sample reception area and being designed with of two analyte binding regions help improve Procalcitonin detection sensitivity; With
3) test strips structure is simple, and material therefor wide material sources are cheap, is applicable to very much Procalcitonin detection large-scale promotion application clinically.
Embodiment
Following examples for illustration of the utility model, but should not be construed as and are limited to embodiment set forth herein.
In following embodiment, described Procalcitonin first antibody, Procalcitonin second antibody, dynamics, quantum dot, rare-earth europium fluorescent microsphere, europium oxide (Eu
2o
3), 4,4'-bis-(1,1', 2,2', 3, fluoro-4', the 6'-acetyl butyryl of 3'-seven-6'-base)-chlorine sulphonyl-ortho-terphenyl (BHHCT), 2-(N-morpholine) ethyl sulfonic acid (MES), carbodiimide (EDC), N-hydroxy-succinamide (NHS), bovine serum albumin(BSA) (BSA), Tween-20, trehalose, Superdex200 filler, glass fibre element film, polyester film, nitrocellulose filter, high-intensity water absorbent paper is commercially available prod.
The preparation method of the reagent strip of described use in conjunction quantum dot and rare-earth luminescent material is:
1) preparation in sample reception district
Glass fibre element film or polyester film are put into the pretreatment fluid (0.1M containing 1%BSA and 0.1%Tween-20, boric acid-the borate buffer solution of pH8.0-8.6 or the 0.05M containing 1%BSA and 0.1%Tween-20, the Tris-HCl damping fluid of pH7.4-8.2) middle after immersion treatment 3-5 hour, in 35-39 DEG C of air dry oven, dry 3-5 hour.
2) preparation of the first analyte binding regions
The pre-service of A, the first analyte binding regions
Glass fibre element film or polyester film are put into the pretreatment fluid (0.1M containing 1%BSA and 0.1%Tween-20, boric acid-the borate buffer solution of pH8.0-8.6 or the 0.05M containing 1%BSA and 0.1%Tween-20, the Tris-HCl damping fluid of pH7.4-8.2) middle after immersion treatment 3-5 hour, in 35-39 DEG C of air dry oven, dry 3-5 hour.
The preparation of B, quantum dot-labeled antibody
Use 0.05M, 2-(N-morpholine) ethyl sulfonic acid (MES) activation buffer of pH4.5-5.0 washs the quantum dot containing carboxylic group in modified surface, adding carbodiimide (EDC) and N-hydroxy-succinamide (NHS) makes the two final concentration be 15-60mmol, room temperature reaction 20-30 minute, abundant washing quantum dot, with 0.05M, the Procalcitonin first antibody that same buffer was dialysed is added after boric acid-borate buffer solution redissolution of pH8.0-8.6, the mass ratio of first antibody and quantum dot is made to be 1:5 to 1:25, room temperature reaction is after 2 hours, add the 0.02M containing 10%BSA, the phosphate buffer room temperature of pH7.2-7.6 closes 30 minutes, abundant washing quantum dot, with the 0.05M containing 1%BSA and 0.1%Tween-20, the conserving liquid of the Tris-HCl damping fluid of pH7.4-8.2 redissolves to original volume.
The preparation of C, the first analyte binding regions
The quantum dot-labeled antibody prepared by this part step B uses and quantitatively sprays film instrument with on the plain film of the glass fibre that 2 μ l/cm-8 μ l/cm even application are pretreated in above-mentioned steps A or polyester film, in 35-39 DEG C of air dry oven, dry 2-4 hour, add drying agent and seal up for safekeeping for subsequent use.
3) preparation of the second analyte binding regions
The pre-service of A, the second analyte binding regions
Glass fibre element film or polyester film are put into the pretreatment fluid (0.1M containing 1%BSA and 0.1%Tween-20, boric acid-the borate buffer solution of pH8.0-8.6 or the 0.05M containing 1%BSA and 0.1%Tween-20, the Tris-HCl damping fluid of pH7.4-8.2) middle after immersion treatment 3-5 hour, in 35-39 DEG C of air dry oven, dry 3-5 hour.
The preparation (1) of B, rare-earth luminescent material labelled antibody
Eu is dissolved with 6M HCl
2o
3, and be settled to final concentration 1mg/ml with ultrapure water, then use 0.05MpH8.0NH
4hCO
3solution dilution 500 times.By BHHCT anhydrous alcohol solution to final concentration 10mg/ml.Use the carbonate mark damping fluid of 0.05-0.2M, pH9.0-9.5 to Procalcitonin first antibody dialysis 4-6 time, or ultrafiltration centrifugation is washed 4-6 time, adjustment concentration is to 0.25mg/ml.Add in first antibody solution by BHHCT ethanol solution with the ratio of volume ratio 1:200, room temperature lucifuge continues mixing reaction 1-3 hour.Use 0.05M pH8.0NH
4hCO
3solution desalination.Use Superdex200 filler purifying bond in 1*30cm post, with 0.1%BSA solution equilibria 1-3 hour, with 0.05M Tris-HCl wash-out, flow velocity is 1ml/min.Protein peak is collected, with 0.22 μm of filter aseptic filtration according to 280nm absorbance.Dilute 20 times with 0.05M Tris-HCl again, add Eu afterwards
3+nH
4hCO
3solution, the ratio being 1:5 to 1:15 according to volume ratio is added, and room temperature lucifuge continues mixing reaction 1-2 hour.Clean with 0.05M Tris-HCl with ultrafiltration centrifugation and be concentrated into antibody concentration and be greater than 5mg/ml, for subsequent use.
The preparation (2) of C, rare-earth luminescent material labelled antibody
Use 0.05M, the rare-earth europium fluorescent microsphere of 2-(N-morpholine) ethyl sulfonic acid (MES) the activation buffer washing of pH4.5-5.0, adding carbodiimide (EDC) and N-hydroxy-succinamide (NHS) makes the two final concentration be 15-60mmol, room temperature reaction 20-30 minute, abundant washing rare-earth europium fluorescent microsphere, with 0.05M, the first antibody of dialysing is added after boric acid-borate buffer solution redissolution of pH8.0-8.6, the mass ratio of Procalcitonin first antibody and fluorescent microsphere is made to be 1:8 to 1:60, room temperature reaction is after 2 hours, add the 0.02M containing 10%BSA, the phosphate buffer room temperature of pH7.2-7.6 closes 30 minutes, abundant washing rare-earth europium fluorescent microsphere, with the 0.05M containing 1%BSA and 0.1%Tween-20, the conserving liquid of the Tris-HCl damping fluid of pH7.4-8.2 redissolves to original volume.
The preparation of D, the second analyte binding regions
The rare-earth luminescent material labelled antibody prepared in this part step B or step C is used and quantitatively sprays film instrument with on the plain film of the glass fibre that 2 μ l/cm-8 μ l/cm even application are pretreated in above-mentioned steps A or polyester film, in 35-39 DEG C of air dry oven, dry 2-4 hour, add drying agent and seal up for safekeeping for subsequent use.
4) preparation of detection zone
The preparation of A, detection zone: use the coating buffer (0.01-0.02M containing 0.1-10% trehalose, the Tris-HCl damping fluid of pH7.4-8.2) Procalcitonin second antibody is diluted to the concentration of 0.2mg/ml-4mg/ml, use quantitatively spray film instrument with 1.2 μ l/cm even application on nitrocellulose filter, in 35-39 DEG C of air dry oven, dry 2-4 hour.
The preparation of B, quality control band: use the coating buffer (0.01-0.02M containing 0.1-10% trehalose, the Tris-HCl damping fluid of pH7.4-8.2) anti-mouse IgG is diluted to the concentration of 0.5mg/ml-3mg/ml, use quantitatively spray film instrument with 0.8 μ l/cm even application on nitrocellulose filter, in 35-39 DEG C of air dry oven, dry 2-4 hour.
The preparation of C, detection zone: with the confining liquid (0.01-0.02M containing 1-10%BSA and 1-10% trehalose, the Tris-HCl damping fluid of pH7.4-8.2) by the cellulose nitrate membrane closure 1-2 hour containing detection zone and quality control band, take out in rearmounted 35-39 DEG C air dry oven and dry 2-4 hour, envelope is for subsequent use.
5) assembling of test strips
Be less than 30% in humidity, under temperature 20-30 DEG C of condition, carry out the assembling of reagent strip.Base plate selects PVC material, connects in turn and the partly overlapping sample reception district of adjacent regions, the first analyte binding regions, the second analyte binding regions, detection zone and suction zones in the direction of base plate the same face.When detection zone covers base plate, the position of detection zone is near the second analyte binding regions, and the position of quality control band is near suction zones.Suction zones is high-intensity water absorbent paper.Be cut into test strips after assembling, and be assembled in reagent card.
6) mensuration of calibration object and measuring samples
The standard items of 100 μ l or measuring samples are joined well, carries out immunochromatography reaction, after 10-15 minute, reagent card is placed in special fluorescence detector, carry out quantitative measurement by the size reading fluorescence signal.
Above embodiment is only in order to the citing done clearly is described, the restriction not to embodiment.
Claims (9)
1. detect a test strips for Procalcitonin, it is characterized in that, comprise the ingredient that following order overlaps successively:
A) for the sample reception district of sample reception,
B) be coated with by the first analyte binding regions of the first antibody of quantum dot-labeled anti-Procalcitonin,
C) the second analyte binding regions of the first antibody of the anti-Procalcitonin marked by rare-earth luminescent material is coated with,
D) have the sample detection district of spaced detection zone and quality control band, wherein said detection zone is fixed with the second antibody of anti-Procalcitonin, described quality control band is fixed with the antibody of against murine IgG, and
E) suction zones.
2. test strips as claimed in claim 1, it is characterized in that, described test strips comprises base plate further, and wherein said sample reception district, the first analyte binding regions, the second analyte binding regions, sample detection district and suction zones are bonded on base plate and also sequentially overlap successively.
3. test strips as claimed in claim 1, it is characterized in that, described quantum dot is microspheres form and has the particle size range of 2nm-30nm, and described quantum dot is selected from following group: CdTe, CdSe, PbSe, InP and GaN.
4. test strips as claimed in claim 1, it is characterized in that, described second analyte binding regions is coated with microballoon further, and wherein said micro-ball load has described rare-earth luminescent material and described first antibody.
5. test strips as claimed in claim 4, it is characterized in that, the particle size of described microballoon is 50nm-400nm.
6. test strips as claimed in claim 5, it is characterized in that, the particle size of described microballoon is 100nm-300nm.
7. test strips as claimed in claim 6, it is characterized in that, the particle size of described microballoon is 100nm or 300nm.
8. test strips as claimed in claim 1, is characterized in that, be interposed between 0.3cm to 0.5cm between described detection zone and described quality control band.
9. test strips as claimed in claim 1, it is characterized in that, the width of described test strips is between 0.2cm to 0.5cm.
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN105548567A (en) * | 2016-01-18 | 2016-05-04 | 武汉菲恩生物科技有限公司 | Kit for time resolution fluorescent quantitative detection on PCT |
CN108535486A (en) * | 2018-02-11 | 2018-09-14 | 北京华海骏业科技发展有限公司 | A kind of chloramphenicol immunofluorescence assay method based on europium label |
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2015
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN105548567A (en) * | 2016-01-18 | 2016-05-04 | 武汉菲恩生物科技有限公司 | Kit for time resolution fluorescent quantitative detection on PCT |
CN108535486A (en) * | 2018-02-11 | 2018-09-14 | 北京华海骏业科技发展有限公司 | A kind of chloramphenicol immunofluorescence assay method based on europium label |
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