CN104181306A - Method and kit for performing quick co-detection on anti-Mc (Moraxella catarrhalis) IgM (Immunoglobulin M) and IgG (Immunoglobulin G) antibodies based on magnetic separation and multi-color quantum dot labeling - Google Patents

Method and kit for performing quick co-detection on anti-Mc (Moraxella catarrhalis) IgM (Immunoglobulin M) and IgG (Immunoglobulin G) antibodies based on magnetic separation and multi-color quantum dot labeling Download PDF

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CN104181306A
CN104181306A CN201410405737.1A CN201410405737A CN104181306A CN 104181306 A CN104181306 A CN 104181306A CN 201410405737 A CN201410405737 A CN 201410405737A CN 104181306 A CN104181306 A CN 104181306A
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antibody
moraxelle catarrhalis
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杨波
胡征
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Hubei Hualong Biological Pharmaceutical Co., Ltd.
Hubei University of Technology
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Abstract

The invention discloses a method and a kit for performing quick co-detection on anti-Mc (Moraxella catarrhalis) IgM (Immunoglobulin M) and IgG (Immunoglobulin G) antibodies based on magnetic separation and multi-color quantum dot labeling. The kit consists of anti-Mc antibody capturing nano magnetic beads with an anti-Mc IgM and IgG antibody gathering function, anti-human IgM and IgG antibody nano probes labeled by multi-color quantum dots, quality control substances and a PBST buffering solution, wherein the quality control substances comprise a positive quality control substance and a negative quality control substance; the positive quality control substance is serum, in which anti-Mc IgM and IgG antibodies of Mc infected people are respectively positive; the negative quality control substance is serum, in which anti-Mc IgM and IgG are respectively negative. The kit and the method have the advantages of simplicity, quickness and high sensitivity, and can be used for carrying out synchronous detection on the anti-Mc IgM and IgG antibodies.

Description

Method and kit that anti-moraxelle catarrhalis IgM based on magnetic resolution and color quantum point mark, IgG antibody are examined fast altogether
Technical field
The present invention relates to technical field of medical detection, be specially a kind of anti-moraxelle catarrhalis IgM, IgG antibody based on magnetic resolution and color quantum point mark and be total to fast detection method and the detection kit of inspection, and the method for preparation and use of this detection kit.
Background technology
Moraxelle catarrhalis (Moraxella catarrhalis, Mc) be found in first 1896, be referred to as at that time catarrh micrococcus luteus (Micrococcus catarrhalis), be called again thereafter micrococcus catarrhalis (Neisseria catarrhalis) and catarrh Blanc Chinese bacterium (Branhamella catarrhalis).Moraxelle catarrhalis is Gram-negative coccus, is conventionally diplococcus reniformis shape, occasionally can be tetrad shape, and atrichia, without brood cell, generally without pod membrane.Its nutritional requirement is not high, on ordinary culture medium, can grow, aerobic, and optimum growth temperature is 35 ℃.Colony diameter 1～3mm, smooth type, canescence, opaque, whole bacterium colony easily scrapes from nutrient culture media.After long period cultivation, bacterium colony can be coarse particles shape, is attached on media surface.Produce oxidase and DNA enzyme.To the equal azymic of carbohydrate.Resistibility is stronger, the 27d of can surviving in phlegm, the 30min of can surviving in the time of 65 ℃.
Past thinks that Mc is to the upper respiratory tract of the human body no pathogenicity bacterium that normally lives away from home always, but, nearly 20 years of researches are found, this bacterium not only can cause children and the elderly's the infection of the upper respiratory tract, but also be the important pathogen that causes Adult Lower Respiratory Tract Infections, be the 3rd common pathogen of maxilla of children sinusitis, tympanitis, pneumonia and adult's chronic lower respiratory infection, be only second to mycoplasma pneumoniae and streptococcus pneumonia.Have been reported this bacterium and can cause respiratory tract infection eruption and prevalence.Therefore, moraxelle catarrhalis and due to infect and to be day by day subject to people and to pay close attention to, the control of the biological characteristics of this bacterium, epidemiology, associated diseases, drug resistance and infection has been had to more understanding.
The infection symptoms causing due to Mc and other respiratory pathogens is clinically similar, therefore is often difficult to reach a conclusion according to clinical manifestation, x-radiological survey X etc., makes a definite diagnosis and often depends on laboratory diagnosis.And the feature of children disease is onset urgency, lapses to soon, therefore responsive, quick, practical Mc detects and has very important significance to carrying out early effective clinical intervention.
In the laboratory diagnosis of infecting at moraxelle catarrhalis, in examinee's serum, anti-moraxelle catarrhalis antibody index is one of important evidence of diagnostic result.
Immunoglobulin M (Immunoglobulin M, IgM) and immunoglobulin G (Immunoglobulin G, IgG) are most important two kinds of antibody in human body.When moraxelle catarrhalis enters after body, the immunoglobulin (Ig) occurring is the earliest IgM antibody, occurs afterwards IgG, by the existence of detection bodies internal specific IgM, IgG antibody, and the immune response state of diagnosable human body to moraxelle catarrhalis.If detect specific IgM antibodies, show to have the generation of recent infection, but IgM is shorter antibody half life, the detection feminine gender of IgM can not prove body uninfection, also needs to detect the half life period longer, the IgG antibody that content is the highest, to clarify a diagnosis.
At present, in serum, the detection method of specific IgM and IgG antibody mainly contains the experiment of condensation collection, gelatin particle aggegation experiment, enzyme-linked immunosorbent assay, ' Jinbiao ' immunization spot method and gold-marking immunity chromatography.The specificity of condensation collection experiment and susceptibility are minimum, so its diagnostic value is little; Though ' Jinbiao ' immunization spot method and gold-marking immunity chromatography are simple and efficient to handle, susceptibility is lower slightly, and the patient that antagonist level is lower has the possibility of failing to pinpoint a disease in diagnosis; Gelatin aggegation experiment reagent is prepared with operating process comparatively loaded down with trivial details, and needs professional operating personnel.Enzyme linked immunosorbent assay has the advantages such as special, responsive, for checking various antibody or antigen, but there is following problem in the method: (1) every a collection of test from application of sample, that the steps such as version are bathed, washed to temperature is more, complex operation, the time is grown (altogether needing 2-4 hour); (2) in detection, need to add respectively color composition A liquid and B liquid, and also will complete at the appointed time reading, increased to a certain extent the possibility of labour intensity and misoperation; (3) when this method cannot be accomplished IgM and two kinds of antibody of IgG, detect.Although detect separately after IgM and IgG antibody, more comprehensively analyze testing result the diagnosis of disease be there is no to impact, operating process is loaded down with trivial details, detect convenient and swiftly not, testing cost altogether inspection also can increase.
Therefore, set up and to possess highly sensitive specific IgM, the IgG antibody that can resist moraxelle catarrhalis and carry out the detection method that Fast synchronization examines altogether and seem very necessary.
Summary of the invention
For these technical matterss that exist in background technology, the invention provides easy, quick, highly sensitive detection method and the kit of synchronously examining altogether anti-moraxelle catarrhalis IgM, IgG antibody of a kind of energy based on magnetic resolution and color quantum point mark, and the method for preparation and use of this kit.
The present invention is achieved through the following technical solutions:
The method that anti-moraxelle catarrhalis IgM based on magnetic resolution and color quantum point mark, IgG antibody are examined fast altogether, is characterized in that: said method comprising the steps of:
1) preparation of restructuring moraxelle catarrhalis Membrane protein antigen UspA1;
2) by step 1) the restructuring moraxelle catarrhalis Membrane protein antigen UspA1 for preparing and nanometer magnetic bead be by covalent coupling, makes anti-moraxelle catarrhalis antibody capture nanometer magnetic bead;
3) nano-quantum point that is 520nm by mouse-anti people IgM monoclonal antibody and emission wavelength, by covalent coupling, is prepared quantum dot-labeled anti-human IgM nano-probe; The nano-quantum point that is 600nm by mouse-anti human IgG monoclonal antibody and emission wavelength, by covalent coupling, is prepared quantum dot-labeled anti-human IgG nano-probe; Quantum dot-labeled anti-human IgM nano-probe and quantum dot-labeled anti-human IgG nano-probe mixed in equal amounts are made to color quantum point anti-human IgM, the IgG nano-probe of mark respectively;
4) get human serum sample, after suitably diluting with PBSA damping fluid, in serum dilution, add step 2 respectively) the anti-moraxelle catarrhalis antibody capture nanometer magnetic bead and the step 3 that prepare) color quantum point for preparing anti-human IgM, the IgG nano-probe of mark respectively, fully mix, after reaction 5-45min, carry out magnetic separation, after PBST damping fluid washing 2 times, use fluorescence microplate reader, at emission wavelength (Em), be respectively and under 520nm and 600nm, read respectively fluorescent value; In described PBSA damping fluid, each component concentration is respectively 8g/L NaCL, 0.2g/L KCl, 0.24g/L KH 2pO 4, 1.44g/L Na 2hPO 4, 5g/L BSA (bovine serum albumin(BSA)), the pH=7.4 of described PBSA damping fluid; In described PBST damping fluid, each component concentration is respectively 8g/L NaCL, 0.2g/L KCl, 0.24g/L KH 2pO 4, 1.44g/L Na 2hPO 4, 5g/L BSA (bovine serum albumin(BSA)), 0.3g/L NaN 3, 0.5ml/L Tween-20, the pH=7.4 of described PBST damping fluid;
5) according to step 4) method detect at least 30 parts and be all defined as all negative human serum samples of anti-moraxelle catarrhalis IgM, IgG antibody through clinical the whole bag of tricks, read respectively emission wavelength (Em) and be respectively the fluorescent value under 520nm and 600nm; Described anti-moraxelle catarrhalis IgM, IgG antibody all negative human serum sample are called for short moraxelle catarrhalis negative antibody control sample; Mean value and 3 times of standard deviation sums of the fluorescent value that described moraxelle catarrhalis negative antibody control sample is 520nm at emission wavelength (Em) are designated as CUT-OFF1 value; Mean value and 3 times of standard deviation sums of the fluorescent value that described moraxelle catarrhalis negative antibody control sample is 600nm at emission wavelength (Em) are designated as CUT-OFF2 value; If step 4) in, human serum sample, at emission wavelength (Em) for the detection fluorescent value of 520nm is greater than CUT-OFF1 value, is judged as in human serum sample anti-moraxelle catarrhalis IgM antibody positive; If step 4) in, human serum sample, at emission wavelength (Em) for the detection fluorescent value of 520nm is less than CUT-OFF1 value, is judged as in human serum sample anti-moraxelle catarrhalis IgM antibody negative; If step 4) in, human serum sample, at emission wavelength (Em) for the detection fluorescent value of 600nm is greater than CUT-OFF2 value, is judged as in human serum sample anti-moraxelle catarrhalis IgG antibody positive; If step 4) in, human serum sample, at emission wavelength (Em) for the detection fluorescent value of 600nm is less than CUT-OFF2 value, is judged as in human serum sample anti-moraxelle catarrhalis IgG antibody negative.
Anti-moraxelle catarrhalis IgM based on magnetic resolution and color quantum point mark, IgG antibody are total to a check reagent box fast, it is characterized in that: described anti-moraxelle catarrhalis IgM, IgG antibody based on magnetic resolution and color quantum point mark is total to check reagent box fast, and by anti-moraxelle catarrhalis antibody capture nanometer magnetic bead, the color quantum point with the anti-moraxelle catarrhalis IgM of enrichment, IgG antibody function, anti-human IgM, IgG antibody nano-probe, quality-control product and the PBST damping fluid of mark are formed respectively; Described quality-control product comprises positive quality control product and negative quality-control product; Described positive quality control product is comprised of serum and two parts of positive serum of anti-moraxelle catarrhalis IgG antibody of two parts of moraxelle catarrhalis the infecteds' anti-moraxelle catarrhalis IgM antibody positive; Described negative quality-control product is all negative human serums of four parts of anti-moraxelle catarrhalis IgM, IgG antibody.
For the preparation of the anti-moraxelle catarrhalis IgM based on magnetic resolution and color quantum point mark, IgG antibody, be total to fast a method for check reagent box, it is characterized in that: said method comprising the steps of:
1) preparation of anti-moraxelle catarrhalis antibody capture nanometer magnetic bead:
1.1) preparation, the purifying of restructuring UspA1-His fusion:
1.1.1) moraxelle catarrhalis outer membrane protein UspA1 is carried out to bioinformatic analysis, obtain the abundantest peptide section of epitope in moraxelle catarrhalis UspA1 albumen ectodomain, find its corresponding gene order;
1.1.2) at step 1.1.1) in resulting gene order 5 ' end and 3 ' end introduce respectively restriction enzyme site chemosynthesis complete genome sequence, with tense marker, be designated as UspA1; Its sequence is referring to sequence table;
1.1.3) by step 1.1.2) in resulting UspA1 by molecular biology method, be cloned into and proceed to expression in escherichia coli restructuring UspA1-His fusion after expression vector pET-28a (+); Described restructuring UspA1-His fusion is present in genetic engineering thalline with inclusion body expression-form;
1.1.4) with ni-sepharose purification step 1.1.3) resulting restructuring UspA1-His fusion, SDS-PAGE detects after its purity, again restructuring UspA1-His fusion is carried out to renaturation, after bradford kit carries out determination of protein concentration, with PBS damping fluid, adjusting concentration is 0.2mg/mL; In described PBS damping fluid, each component content is as follows: 8g/L NaCL, 0.2g/L KCl, 0.24g/L KH 2pO 4, 1.44g/L Na 2hPO 4, the pH=7.4 of described PBS damping fluid;
1.2) nanometer magnetic bead is coated:
1.2.1) get 5mg magnetic bead, with 1ml MES damping fluid washing three times, be placed in nano magnetic separation vessel and carry out removing supernatant after magnetic separation; Described magnetic bead is with superparamagnetism Fe 3o 4for kernel, the particle diameter carboxyl magnetic bead that is 1150nm; Described MES damping fluid is that mass concentration is 2-(N-morpholino) ethyl sulfonic acid of 2g/L; The pH=6.0 of described MES damping fluid; The magnetic intensity of described nano magnetic separation vessel is 0.4T;
1.2.2) add successively and use step 1.2.1) in the concentration of MES damping fluid preparation be the EDC solution of 8-12mg/ml and use step 1.2.1) in the concentration prepared of MES damping fluid be each 0.5ml of sulfo-NHS solution of 6-10mg/ml, with 10-40rpm/min, in rotation mixed instrument, activate 1hr, being placed in nano magnetic separation vessel carries out removing supernatant after magnetic separation, with 1ml step 1.2.1) in MES damping fluid resuspended, the magnetic bead after being activated;
1.2.3) get 5 centrifuge tubes, in each centrifuge tube, add 200 μ L step 1.2.2) magnetic bead after resulting activation, being placed in nano magnetic separation vessel carries out removing supernatant after magnetic separation, to add in each centrifuge tube concentration with the dilution of PBS damping fluid be 50-200 μ g/ml by step 1.1.4) prepared each 1ml of restructuring UspA1-His fusion solution, under room temperature, with 15rpm/min, in rotation mixed instrument, react 2-6h, being placed in nano magnetic separation vessel carries out removing after supernatant after magnetic separation, respectively add 1ml to contain the above-mentioned PBS damping fluid of 1mg/ml monoethanolamine, under room temperature with 15rpm/min in rotation react in mixed instrument 2h with sealing magnetic bead on not with the carboxyl of antibody response, in described PBS damping fluid, each component content is as follows: 8g/L NaCL, 0.2g/L KCl, 0.24g/L KH 2pO 4, 1.44g/L Na 2hPO 4, the pH=7.4 of described PBS damping fluid,
1.2.4) after capping completes, these 5 centrifuge tubes are placed in to nano magnetic separation vessel and carry out removing supernatant after magnetic separation, each washs three times with 1ml lavation buffer solution; In described lavation buffer solution, each component content is as follows: 8g/L NaCL, 0.2g/L KCl, 0.24g/L KH 2pO 4, 1.44g/L Na 2hPO 4, 0.5ml/L Tween-20, the pH=7.4 of described lavation buffer solution;
1.2.5) in each centrifuge tube, add respectively 1ml to preserve the resuspended magnetic bead of damping fluid, be placed in 4 ℃ and save backup; So far make anti-moraxelle catarrhalis antibody capture nanometer magnetic bead; In described preservation damping fluid, each component content is as follows: 8g/L NaCL, 0.2g/L KCl, 0.24g/L KH 2pO 4, 1.44g/L Na 2hPO 4, 0.3g/LNaN 3, 5g/L bovine serum albumin(BSA) (BSA), the pH=7.4 of described preservation damping fluid;
2) the color quantum point difference anti-human IgM of mark is, the preparation of IgG nano-probe:
Its concrete preparation method comprises:
2.1) in microcentrifugal tube, add successively 2nmol carboxyl water-soluble quantum dot, 300nmol N-hydroxy-succinamide sulfo-NHS and 300nmol carbodiimide EDC, take phosphate buffer constant volume as 5ml, mixed solution, after 37 ℃ of reaction 30min, the excessive sulfo-NHS as activator and EDC, the quantum dot after being activated are removed in dialysis; The emission wavelength of described carboxyl water-soluble quantum dot is 520nm; In described phosphate buffer, each component content is as follows: 2.9g/L sodium hydrogen phosphate, 0.295g/L sodium dihydrogen phosphate, 4g/L sodium chloride; The pH=7.4 of described phosphate buffer;
2.2) in step 2.1) in the quantum dot of resulting activation, add the mouse-anti people IgM monoclonal antibody of 2-12nmol, lucifuge reaction 2h, adds single-ended amination polyglycol PEG2000-NH 2to final concentration be 1%, seal unreacted activated carboxyl site, continue lucifuge reaction 1h;
2.3) with 0.2 μ m PES filter, remove by filter step 2.2) in antibody aggregation thing, then filtrate is transferred in 50000MW ultra-filtration centrifuge tube, with 8000g centrifugal force centrifugal 15min at 4 ℃, remove the antibody of coupling reaction and the accessory substance in reaction do not occur;
2.4) collect step 2.3) middle ultra-filtration centrifuge tube filter membrane upper strata quantum dot-antibody coupling matter solution, be dissolved in 2ml phosphate cleansing solution, again this solution is transferred in a new 50000MW ultra-filtration centrifuge tube, with 8000g centrifugal force centrifugal 15min at 4 ℃, collect ultra-filtration centrifuge tube filter membrane upper strata quantum dot-antibody coupling matter solution, be dissolved in 1ml phosphate and preserve in liquid, be placed in 4 ℃ and save backup, so far make quantum dot-labeled anti-human IgM nano-probe; In described phosphate cleansing solution, each component content is as follows: 2.9g/L sodium hydrogen phosphate, 0.295g/L sodium dihydrogen phosphate, 4g/L sodium chloride, 5ml/L Tween-20,0.3g/L Sodium azide, the pH=7.4 of described phosphate cleansing solution; In described phosphate preservation liquid, each component content is as follows: 2.9g/L sodium hydrogen phosphate, 0.295g/L sodium dihydrogen phosphate, 2g/L sodium chloride, 10g/L bovine serum albumin(BSA), 0.3g/L Sodium azide; Described phosphate is preserved the pH=7.4 of liquid;
2.5) by and step 2.1)-2.4) identical method utilizes the carboxyl water-soluble quantum dot that mouse-anti human IgG monoclonal antibody and emission wavelength are 600nm to make quantum dot-labeled anti-human IgG nano-probe; By the 1:1 mixing by volume of above-mentioned two kinds of quantum dot-labeled nano-probe solution, make color quantum point anti-human IgM, the IgG nano-probe of mark respectively;
3) preparation of PBST damping fluid:
Its concrete compound method comprises:
Get 8g NaCL, 0.2g KCl, 0.24KH 2pO 4, 1.44g Na 2hPO 4, 5g BSA, 0.3g NaN 3, 0.5ml Tween-20 is dissolved in 900ml distilled water, adjusts pH to 7.4, then be settled to 1000ml with 5M NaOH;
4) preparation of quality-control product:
4.1) positive quality control product:
4.1.1) anti-moraxelle catarrhalis IgM antibody positive quality-control product: the definite positive serum of anti-moraxelle catarrhalis IgM antibody by 0.5ml moraxelle catarrhalis the infected forms;
4.1.2) anti-moraxelle catarrhalis IgG antibody positive quality-control product: the definite positive serum of anti-moraxelle catarrhalis IgG antibody by 0.5ml moraxelle catarrhalis the infected forms;
4.2) negative quality-control product: by the anti-moraxelle catarrhalis IgM of 0.5ml, IgG antibody all negative human serum form.
As preferably, the present invention is at step 1.2.2) in, add successively and use step 1.2.1) in the concentration of MES damping fluid preparation be the EDC solution of 10mg/ml and use step 1.2.1) in the concentration prepared of MES damping fluid be each 0.5ml of sulfo-NHS solution of 8mg/ml, with 15rpm/min, in rotation mixed instrument, activate 1 hr, being placed in nano magnetic separation vessel carries out removing supernatant after magnetic separation, with 1ml step 1.2.1) in MES damping fluid resuspended, the magnetic bead after being activated;
Described step 1.2.3) in, to add in each centrifuge tube concentration with the dilution of PBS damping fluid be 120 μ g/ml by step 1.1.4) prepared each 1ml of restructuring UspA1-His fusion solution, under room temperature, with 15rpm/min, in rotation mixed instrument, react 3h, be placed in nano magnetic separation vessel and carry out removing after supernatant after magnetic separation, respectively add 1ml to contain the above-mentioned PBS damping fluid of 1mg/ml monoethanolamine;
Described step 2.2) in, in step 2.1) in the quantum dot of resulting activation, add the mouse-anti people IgM monoclonal antibody of 6nmol, lucifuge reaction 2h.
As preferably, quantum dot of the present invention is water-soluble CdSe/ZnS quantum dot that carboxylated amphipathic polymer is modified.
As preferably, magnetic bead of the present invention is with superparamagnetism Fe 3o 4for kernel, shell material are that polystyrene, surface functional group are the carboxyl magnetic bead that carboxyl, particle diameter are 1150nm.
Anti-moraxelle catarrhalis IgM based on magnetic resolution and color quantum point mark, IgG antibody are total to a using method for check reagent box fast, it is characterized in that: described using method comprises the following steps:
1) get serum sample 5 μ l to be checked with after 995 μ l PBSA damping fluid dilutions, dilution being proceeded in the common centrifuge tube of 1.5ml; In described PBSA damping fluid, each component content is as follows: 8g/L NaCL, 0.2g/L KCl, 0.24g/L KH 2pO 4, 1.44g/L Na 2hPO 4, 5g/L BSA; The pH=7.4 of described PBSA damping fluid;
2) to step 1) in centrifuge tube in add successively the anti-moraxelle catarrhalis IgM based on magnetic resolution and color quantum point mark, IgG antibody is total to anti-moraxelle catarrhalis antibody capture nanometer magnetic bead 10-100 μ l and the anti-moraxelle catarrhalis IgM based on magnetic resolution and color quantum point mark in check reagent box fast, IgG antibody is total to the anti-human IgM of the color quantum point difference mark in check reagent box fast, IgG nano-probe 50 μ l, after reacting 5-25min with 10rpm/min on rotation mixed instrument under room temperature, take off, centrifuge tube is inserted to the separated 3min of nano magnetic separation vessel magnetic, with pipettor sucking-off supernatant,
3) adding the anti-moraxelle catarrhalis IgM based on magnetic resolution and color quantum point mark, the PBST damping fluid 1ml that IgG antibody is total in check reagent box fast washs twice, sucking-off cleansing solution after the separation of employing nano magnetic separation vessel magnetic, finally use the resuspended magnetic bead of 0.2ml PBS damping fluid, make nanometer magnetic bead-moraxelle catarrhalis antibody-quantum dot " sandwich " compound; In described PBS damping fluid, each component content is as follows: 8g/L NaCL, 0.2g/L KCl, 0.24g/L KH 2pO 4, 1.44g/L Na 2hPO 4; The pH=7.4 of described PBS damping fluid;
4) by step 3) nanometer magnetic bead-moraxelle catarrhalis antibody-quantum dot compound of obtaining is loaded in ELISA Plate, use fluorescence microplate reader to be all 365nm in excitation wavelength (Ex), emission wavelength (Em) is respectively under the parameter of 520nm and 600nm distinguishes reading to its fluorescent value respectively;
5) by above-mentioned same method, detect at least 30 parts and be all defined as all negative human serum samples of anti-moraxelle catarrhalis IgM, IgG antibody through clinical the whole bag of tricks, read respectively emission wavelength (Em) and be respectively the fluorescent value under 520nm and 600nm; Described mean value and the 3 times of standard deviation sums that are all defined as anti-moraxelle catarrhalis IgM, the IgG antibody fluorescent value that all negative human serum sample is 520nm at emission wavelength (Em) through clinical the whole bag of tricks are designated as CUT-OFF1 value; Described mean value and the 3 times of standard deviation sums that are all defined as anti-moraxelle catarrhalis IgM, the IgG antibody fluorescent value that all negative human serum sample is 600nm at emission wavelength (Em) through clinical the whole bag of tricks are designated as CUT-OFF2 value; The four parts of negative quality-control product samples and the four parts of positive quality control product samples that in detection kit, provide read respectively emission wavelength (Em) and are respectively the fluorescent value under 520nm and 600nm simultaneously; The mean value of the fluorescent value that four parts of negative quality-control product samples are 520nm at emission wavelength (Em) is designated as NCX1; The mean value of the fluorescent value that four parts of negative quality-control product samples are 600nm at emission wavelength (Em) is designated as NCX2 value; Two parts of anti-moraxelle catarrhalis IgM antibody positive quality-control product samples emission wavelength (Em) for the fluorescence mean value of 520nm be PCX1; Two parts of anti-moraxelle catarrhalis IgG antibody positive quality-control product samples emission wavelength (Em) for and 600nm under fluorescent value be designated as PCX2; If step 4) in, serum sample to be checked, at emission wavelength (Em) for the detection fluorescent value of 520nm is greater than CUT-OFF1 value and PCX1/NCX1 >=2.1, is judged as in serum sample to be checked anti-moraxelle catarrhalis IgM antibody positive; If step 4) in, serum sample to be checked is at emission wavelength (Em) for the detection fluorescent value of 520nm is less than CUT-OFF1 value and PCX1/NCX1 >=2.1, and in judgement behaviour serum sample to be checked, anti-moraxelle catarrhalis IgM antibody is negative; If step 4) in, serum sample to be checked, at emission wavelength (Em) for the detection fluorescent value of 600nm is greater than CUT-OFF2 value and PCX2/NCX2 >=2.1, is judged as in serum sample to be checked anti-moraxelle catarrhalis IgG antibody positive; If step 4) in, serum sample to be checked, at emission wavelength (Em) for the detection fluorescent value of 600nm is less than CUT-OFF2 value and PCX2/NCX2 >=2.1, is judged as in serum sample to be checked anti-moraxelle catarrhalis IgG antibody negative; If PCX1/NCX1 < 2.1 or PCX2/NCX2 < 2.1, all show that kit lost efficacy.
As preferably, step 2 proposed by the invention) in, to step 1) in centrifuge tube in add successively the anti-moraxelle catarrhalis IgM based on magnetic resolution and color quantum point mark, IgG antibody is total to anti-moraxelle catarrhalis antibody capture nanometer magnetic bead 20 μ l and the anti-moraxelle catarrhalis IgM based on magnetic resolution and color quantum point mark in check reagent box fast, IgG antibody is total to the anti-human IgM of the color quantum point difference mark in check reagent box fast, IgG nano-probe 50 μ l, after reacting 10min with 10rpm/min on rotation mixed instrument under room temperature, take off, centrifuge tube is inserted to the separated 3min of nano magnetic separation vessel magnetic, with pipettor sucking-off supernatant.
Carboxyl water-soluble nano quantum dot required for the present invention, 1150nm carboxyl magnetic bead, research unit, company that mouse-anti people IgM monoclonal antibody, mouse-anti human IgG monoclonal antibody etc. can arrive relevant speciality buy or customization; Required instrument, equipment, medicine all have commercially available.
The present invention compared to existing technology tool has the following advantages:
1, the present invention utilized nanometer magnetic bead to sample can enriching, fast, the efficiency advantages of higher of separated speed, the characteristics such as the while is high in conjunction with quantum dot photochemical stability, fluorescence intensity is high, make detection system possess the collaborative effect of amplifying of multiple signal, thereby there is detection sensitivity and the accuracy of superelevation.
2, the present invention's capture antigen used is to include the recombinant antigen that moraxelle catarrhalis specificity UspA1 proteantigen extracellular region is rich in epitope, and the antibody horizontal for its generation in patients serum is high, so capture effect is good.
3, the present invention's capture antigen specificity used is high, and between the antibody of other common respiratory pathogens (as first, B-mode human influenza virus, human influenza haemophilus, people streptococcus pneumonia, people's mycoplasma pneumoniae, people's Chlamydia pneumoniae etc.) without antibody and antigen cross-reaction.
4, the present invention's antigen used is genetic engineering recombinant antigen, and protein expression amount is high, and protein renaturation method is simple, therefore comparatively cheap and easy to get.
5, detection method of the present invention is simple, detects (within 30min) fast, is easy to judge, testing cost is cheap, has overcome that prior art Positive rate is low, cost is high, complicated operation is loaded down with trivial details, the deficiency of length consuming time, clinical practice inconvenience.
6, the present invention can realize the synchronous detection of anti-moraxelle catarrhalis IgM, IgG antibody, having solved subitem, to detect the operating process bringing loaded down with trivial details, detect convenient and swift not, the problems such as testing cost is higher, and also do not seen on the market the appearance that anti-moraxelle catarrhalis IgM, the synchronous product detecting of IgG antibody or related science are reported at present.
Embodiment
The present invention is according to the antibody antigen reaction principle in immunology, utilize nanometer magnetic bead to sample can enriching, fast, the efficiency advantages of higher of separated speed, the characteristic such as high in conjunction with quantum dot photochemical stability, fluorescence intensity is high, that sets up a set ofly possesses the new method that the collaborative Fast synchronization that amplifies, has hypersensitivity and high degree of specificity of multiple signal detects anti-moraxelle catarrhalis IgM, IgG antibody, has wide market application foreground.
The present invention is further described in detail by following examples.
The preparation of various reagent and the explanation of material requested
1.PBSA damping fluid: take 1.44g sodium hydrogen phosphate, 0.24g potassium dihydrogen phosphate, 8g sodium chloride, 0.2g potassium chloride, 5g bovine serum albumin(BSA) is dissolved in the deionized water of 900ml, adjusts that pH to 7.4 is rear is settled to 1000ml with deionized water with 1mol/L NaOH.
2.PBS damping fluid: take 1.44g sodium hydrogen phosphate, 0.24g potassium dihydrogen phosphate, 8g sodium chloride, 0.2g potassium chloride is dissolved in the deionized water of 900ml, adjusts that pH to 7.4 is rear is settled to 1000ml with deionized water with 1mol/L NaOH.
3. restructuring UspA1-His fusion: be the present invention's self-control, with the dilution of PBS damping fluid, shake up, the weight percent concentration that makes recombinant protein in solution is 0.2mg/ml.
4. mouse-anti people IgM monoclonal antibody: be Abcam company product, article No. ab99741, with the dilution of PBS damping fluid, shakes up, and making monoclonal antibody weight percent concentration in solution is 1mg/ml.
5. mouse-anti human IgG monoclonal antibody: be Abcam company product, article No. ab99757, with the dilution of PBS damping fluid, shakes up, and making monoclonal antibody weight percent concentration in solution is 1mg/ml.
6. quantum dot: in the present invention, two kinds of quantum dots used are water-soluble CdSe/ZnS quantum dot that carboxylated amphipathic polymer is modified, its emission wavelength is respectively 520nm and 600nm, from Wuhan Jia Yuan technology of quantum dots development corporation, Ltd., buy, name of product is carboxyl water-soluble quantum dot-520 and carboxyl water-soluble quantum dot-600.
7. magnetic bead: in the present invention, magnetic bead used is with superparamagnetism Fe 3o 4for kernel, shell material are that polystyrene, surface functional group are that carboxyl, particle diameter are the carboxyl magnetic bead that is respectively 50nm, 180nm, 350nm, 1150nm, 3 μ m, Ke Cong Shanxi North America Gene Co., Ltd, Aorun Weina New Material Science and Technology Co., Ltd., Shanghai buy.
Expression, purifying and the renaturation of embodiment 1 restructuring UspA1-His fusion
1. the clone of related gene
Moraxelle catarrhalis surface protein UspA1 (the accession number in its NCBI Protein Data Bank is AAF36416) is carried out to bioinformatic analysis, obtain the abundantest peptide section of epitope in the outer conserved domain of its born of the same parents, find its corresponding DNA encoding sequence, simultaneously its 5 ' introduce restriction enzyme site NdeI, 3 ' end to introduce termination signal TAA and restriction enzyme site XhoI after chemosynthesis complete genome sequence (complete sequence is synthetic transfers to Jin Sirui bio tech ltd to complete, during delivery, artificial synthetic genetic fragment is connected on carrier pUC57), be designated as UspA1.Its gene complete sequence is as shown in sequence table.Specifically, the protein sequence of UspA1 gene code is the 522-710aa of natural moraxelle catarrhalis surface protein UspA1 (accession number:AAF36416).The carrier pUC57 that contains this section of artificial synthetic DNA fragmentation is carried out reclaiming according to a conventional method object fragment after double digestion with NdeI and XhoI, standby.Adopt NdeI and XhoI to carry out double digestion to carrier pET-28a (+) simultaneously, and according to a conventional method the UspA1 gene obtaining after double digestion is connected in pET-28a (+) carrier, and transform Escherichia coli TOP10, build pET-UspA1 expression vector.Through enzyme, cut with sequencing and confirm that expression vector establishment is errorless.This vector expression restructuring UspA1-His fusion.
2. the expression and purification of restructuring UspA1-His fusion
By identifying after correct positive colony bacterium is cultivated, extract plasmid, technology proceeds in competence E.coliBL21 (DE3) routinely, after having transformed, bacterium liquid is coated containing on the LB flat board of 50 μ g/mL kanamycins, screens according to a conventional method expression strain.The single bacterium colony with exogenous protein expression ability that picking pET-UspA1 transforms is also inoculated in 100mL LB nutrient culture media, in 37 ℃ of overnight incubation.Take out after bacterium liquid, by 1:100, be inoculated in the LB nutrient culture media that 100mL contains 50 μ g/mL kanamycins, in 37 ℃, be cultured to OD 600=0.6 o'clock, add 1mol/L IPTG to final concentration be 1mmol/L, in 37 ℃, shake bacterium and cultivate, induction expressing fusion protein.After induction 4h, respectively at centrifugal 10min under 8000r/min, collect thalline.By thalline with 20mL PBS damping fluid washing 3 times and again resuspended after carry out ultrasonication, operating conditions is: 50HZ, 200W, ultrasonic 3S, intermittently 5S, works 100 times.After ultrasonic completing, the centrifugal 15min collecting precipitation of 12000g, is inclusion body.By this lavation buffer solution (20mM Na for inclusion body 3pO 4, 0.5M NaCl; 3M urea, 30mM imidazoles, pH7.4) after washed twice, the centrifugal 15min collecting precipitation of 12000g.To precipitate (the 20mMNa with Binding buffer 3pO 4, 0.5M NaCl; 8M urea, 30mM imidazoles, pH7.4) after dissolving under room temperature, the centrifugal 15min of 12000g, supernatant filters with the filter membrane of 0.45 μ m.His Trap affinity columns (GE healthcare company product) for recombinant protein in this lysate, method is to specifications carried out purifying.Concrete grammar is as follows:
1) with 5mL syringe, be filled distilled water, turn on the stopper of post, with the joint providing, post is connected with syringe, with 1mL/min flow velocity, wash post.
2) with 10mL Binding buffer balance, 1mL/min flow velocity.
3) by fusion loading, 1mL/min flow velocity.
4) with 10mL Binding buffer, with 1mL/min flow velocity, wash post.
5) with 10mL Elution buffer (20mM Na 3pO 4, 0.5M NaCl; 8M urea, 500mM imidazoles, pH7.4), with 1mL/min flow velocity wash-out, is in charge of collection, every pipe 1ml, 12%SDS-PAGE detects, and merges the sample that contains destination protein in elution fraction.After bradford kit carries out determination of protein concentration, adjustment concentration is 0.5mg/mL.
3. the renaturation of restructuring UspA1-His fusion
By the above-mentioned restructuring UspA1-His fusion through His Trap affinity columns purifying, first by the PBS damping fluid dialysed overnight containing 4mol/L urea, and then each respectively with containing 2,1,0.6, the PBS damping fluid gradient of 0.2mol/L urea each 4h that dialyses, finally with PBS damping fluid dialysis 4h.By dislysate, each uses the centrifugal 15min of 12000rpm, and supernatant is the restructuring UspA1-His fusion of renaturation.After bradford kit carries out determination of protein concentration, with PBS damping fluid, adjust its concentration and be 0.2mg/mL, coated for nanometer magnetic bead.
The preparation of the anti-moraxelle catarrhalis antibody capture of embodiment 2 nanometer magnetic bead
1. the optimization of restructuring UspA1-His fusion coupling magnetic bead reaction conditions:
Using coupling the magnetic bead of restructuring UspA1-His fusion as solid phase carrier, quantum dot-labeled mouse-anti people IgM monoclonal antibody, as detecting antibody, detects anti-moraxelle catarrhalis IgM Positive Sera, observes the coupling situation of magnetic bead and recombinant protein.The coupling conditions such as the activator concentration of the particle diameter to magnetic bead, and EDC/NHS respectively, coupling antibody concentration, coupling time, sealer kind have carried out a series of optimization and have selected.
The selection of 1.1 magnetic bead particle diameters
Selection particle diameter is the carboxyl nanometer magnetic bead of 50nm, 180nm, 350nm, 1150nm, 3 μ m, all adds the PBS damping fluid containing 4mg/ml EDC and 4mg/ml NHS to carry out after priming reaction, respectively with restructuring UspA1-His fusion coupling reaction.Respectively the carboxyl nanometer magnetic bead preparing is detected to anti-moraxelle catarrhalis IgM Positive Sera, observations under fluorescent microscope, selects fluorescence intensity large, and background fluorescence disturbs few, and the very fast person of velocity of separation is the suitableeest magnetic bead particle diameter under magnetic fields.Result shows the magnetic bead requirement the most according to the invention of particle diameter 1150nm, determines that the suitableeest carboxyl magnetic bead particle diameter is 1150nm.
The selection of 1.2 EDC/NHS activator concentrations
After EDC in reaction system and NHS concentration are made as to l～10 mg/ml separately, carry out concentration gradient combination, activate respectively the carboxyl nanometer magnetic bead of particle diameter 1150nm.The carboxyl nanometer magnetic bead preparing is detected to anti-moraxelle catarrhalis IgM Positive Sera, and selecting the powerhouse of fluorescence is the suitableeest activation concentration of EDC and NHS solution.Result show when EDC concentration be 5mg/ml, NHS concentration while being 4mg/ml coupling effect best.
The selection of 1.3 coupled antigen concentration
By the restructuring UspA1-His fusion of 10 μ g, 50 μ g, 100 μ g, 120 μ g, 150 μ g, 200 μ g, 250 μ g, 300 μ g, being 1150nm respectively with 1mg by the particle diameter of above-mentioned best practice activation, magnetic bead carries out coupling.The carboxyl nanometer magnetic bead preparing is detected respectively to anti-moraxelle catarrhalis IgM Positive Sera, found that, when the injected volume of recombinant protein is less than 120 μ g/mg, fluorescence intensity is along with the concentration of antibody increases and increases, and when the injected volume of recombinant protein is greater than 120 μ g/mg, fluorescence intensity is substantially constant even slightly to be reduced, so the coupling amount of the present embodiment selection restructuring moraxelle catarrhalis UspA1-His recombinant protein is 120 μ g/mg.
The selection of 1.4 coupling times
Determine after particle diameter, EDC/NHS activator concentration and the antibody coupling amount of magnetic bead, the coupling reaction time of restructuring UspA1-His fusion and magnetic bead is made as respectively to 0.5h, 1h, 2h, 3h, 4h, 5h.The carboxyl nanometer magnetic bead preparing is detected respectively to anti-moraxelle catarrhalis IgM Positive Sera, found that, when coupling time >3h, fluorescence intensity tends towards stability, and after this extends coupling time again, and fluorescence no longer strengthens.Therefore, the suitableeest coupling reaction time of definite restructuring UspA1-His fusion and magnetic bead is 3h.Coupling time is far fewer than the 24h of traditional E LISA method.
The selection of 1.5 sealers
According to carrying out coupling reaction after particle diameter, EDC/NHS activator concentration, antibody coupling amount and the coupling time of above-mentioned definite optimal conditions selection magnetic bead.After coupling finishes, select BSA, monoethanolamine, Tris and D-Glucosamine Hydrochloride, as nanometer magnetic bead sealer, make finished product carboxyl nanometer magnetic bead.The nanometer magnetic bead preparing is detected respectively to anti-moraxelle catarrhalis IgM Positive Sera, found that, adopt monoethanolamine the highest as the detection fluorescent value of the nanometer magnetic bead of sealer.Supposition, because the molecule of monoethanolamine is less, can consume the surperficial carboxyl of not being combined with antibody due to sterically hindered preferably, makes sealing more complete, and effectively reduces space steric effect to connecting the structure influence of antibody.
Simultaneously, using coupling the carboxyl nanometer magnetic bead of restructuring UspA1-His fusion as solid phase carrier, corresponding quantum dot-labeled mouse-anti human IgG monoclonal antibody is as detecting antibody, set up the detection system of anti-moraxelle catarrhalis IgG antibody, the reaction conditions of the recombinant protein coupling magnetic bead in corresponding detection system is optimized.Found that, the best coupling condition in this detection system is all in full accord with the given result of above-mentioned steps 1.1-1.5.
2. coupling process:
Get 5mg magnetic bead (with superparamagnetism Fe 3o 4for kernel, the particle diameter carboxyl magnetic bead that is 1150nm) in the common centrifuge tube of 1.5ml, with 1ml MES damping fluid (2g/L MES, pH6.0) washing is three times, being placed in nano magnetic separation vessel carries out removing supernatant after magnetic separation (0.4T), add successively the EDC solution that the concentration with the preparation of above-mentioned MES damping fluid is 10mg/ml and each 0.5ml of sulfo-NHS solution that is 8mg/ml by the concentration that above-mentioned MES damping fluid is prepared, with 15rpm/min, in rotation mixed instrument, activate 1hr, after magnetic separation, remove supernatant, resuspended with the MES damping fluid that 1ml is above-mentioned; Get 5 centrifuge tubes, add the magnetic bead of the above-mentioned activation of 200 μ L in each centrifuge tube, sucking-off supernatant after magnetic separation adds with PBS damping fluid (8g/L NaCL, 0.2g/LKCl, 0.24g/L KH in each pipe 2pO 4, 1.44g/L Na 2hPO 4pH7.4) concentration of dilution is prepared each 1ml of restructuring UspA1-His fusion solution of embodiment 1 of 120 μ g/ml, under room temperature, with 15rpm/min, in rotation mixed instrument, react 3h, magnetic separation removes after supernatant, respectively add 1ml to contain the above-mentioned PBS damping fluid of 1mg/ml monoethanolamine, under room temperature, with 15rpm/min, in rotation mixed instrument, react 2h with on sealing magnetic bead not with the carboxyl of antibody response.After magnetic separation, remove and respectively manage supernatant, each uses 1ml lavation buffer solution (8g/L NaCL, 0.2g/LKCl, 0.24g/L KH 2pO 4, 1.44g/L Na 2hPO 4, 0.5ml/L Tween-20, pH7.4) wash three times, last each preserved damping fluid (8g/L NaCL, 0.2g/L KCl, 0.24g/L KH with 1ml 2pO 4, 1.44g/L Na 2hPO 4, 0.3g/L NaN 3, 5 g/L BSA, pH7.4) and resuspended magnetic bead, be placed in 4 ℃ and save backup, so far make anti-moraxelle catarrhalis antibody capture nanometer magnetic bead.
The embodiment 3 color quantum points difference anti-human IgM of mark are, the preparation of IgG nano-probe
1. the optimization of the quantum dot-labeled mouse-anti people of nanometer carboxylic IgM monoclonal antibody reactive condition:
1.1, the quantum dot-labeled antibody probe optimum mark of carboxyl pH's determines
Phosphate buffer pH in labeled reactant is made as respectively to 5,6,7,8,9, the full spectrometer of marked product utilization is carried out to fluorescent strength determining, observe the impact of different pH values on coupling reaction, determined that the best pH of quantum dot-labeled monoclonal antibody reaction is 7.0-8.0.This experimental selection pH7.4.
1.2, the quantum dot-labeled antibody probe optimum mark of carboxyl amount determines
Quantum dot volumetric molar concentration and the ratio of monoclonal antibody concentration are set to respectively to 1:1,1:2,1:3 and 1:4, carry out after labeled reactant, the full spectrometer of marked product utilization is carried out to fluorescent strength determining, observe the impact of the two variable concentrations comparison coupling reaction, the optimum molar concentration ratio of determining quantum dot-labeled mouse-anti people IgM monoclonal antibody reactive is that quantum dot and antibody mol ratio are 1:3.This optimal concentration of this experimental selection is recently determined labelled amount.
1.3, the best sealer kind of the quantum dot-labeled antibody probe of carboxyl determines
With monoethanolamine, Tris, PEG2000-NH 2or BSA, as sealer, is undertaken after labeled reactant by step 1.1 and 1.2 definite conditions, and the full spectrometer of marked product utilization is carried out to fluorescent strength determining, observes different sealers for the impact of labeled reactant, found that PEG2000-NH 2for best sealer, it can significantly improve colloidal stability and the immunocompetence of labeled complex.
The optimum results of the quantum dot-labeled mouse-anti people of the nanometer carboxylic IgM monoclonal antibody reactive correlated condition that the condition optimizing result of the quantum dot-labeled mouse-anti human IgG of nanometer carboxylic monoclonal antibody reactive and step 1.1-1.3 describe is all in full accord.
2. labeling process:
In microcentrifugal tube, add successively 2nmol carboxyl water-soluble quantum dot (emission wavelength 520nm), 300nmol N-hydroxy-succinamide (sulfo-NHS) and 300nmol carbodiimide (EDC), with phosphate buffer (2.9g/L sodium hydrogen phosphate, 0.295g/L sodium dihydrogen phosphate, 4g/L sodium chloride, pH7.4) constant volume is 2ml, ceaselessly mixed solution, after 37 ℃ of reaction 30min, dialyses and removes the excessive sulfo-NHS as activator and EDC.In the quantum dot of activation, add the mouse-anti people IgM monoclonal antibody of 6nmol, lucifuge reaction 2h, adds single-ended amination polyglycol (PEG2000-NH 2) to final concentration be 1%, seal unreacted activated carboxyl site, continue lucifuge reaction 1h.With 0.2 μ m PES filter, remove by filter antibody aggregation thing, then filtrate is transferred in 50000MW ultra-filtration centrifuge tube, with 8000g centrifugal force centrifugal 15min at 4 ℃, remove the antibody of coupling reaction and the accessory substance in reaction do not occur.Collect super filter tube filter membrane upper strata quantum dot-antibody coupling matter solution, be dissolved in 2ml phosphate cleansing solution (2.9g/L sodium hydrogen phosphate, 0.295g/L sodium dihydrogen phosphate, 4g/L sodium chloride, 5ml/L Tween-20, 0.3g/L Sodium azide, pH7.4) in, again this solution is transferred in 50000MW ultra-filtration centrifuge tube, with 8000g centrifugal force centrifugal 15min at 4 ℃, collect super filter tube filter membrane upper strata quantum dot-antibody coupling matter solution, be dissolved in 1ml phosphate and preserve liquid (2.9g/L sodium hydrogen phosphate, 0.295g/L sodium dihydrogen phosphate, 2g/L sodium chloride, 10g/L BSA, 0.3g/L Sodium azide, pH7.4) in, so far make quantum dot-labeled anti-human IgM nano-probe, being placed in 4 ℃ saves backup.
By above-mentioned same procedure, utilize the carboxyl water-soluble quantum dot that mouse-anti human IgG monoclonal antibody and emission wavelength are 600nm to make quantum dot-labeled anti-human IgG nano-probe.By the 1:1 mixing by volume of above-mentioned two kinds of quantum dot-labeled nano-probe solution, make color quantum point anti-human IgM, the IgG nano-probe of mark respectively;
Embodiment 4 carboxyl nanometer magnetic beads carry out the optimization of immunocapture condition to moraxelle catarrhalis antigen
Using coupling the magnetic bead of restructuring UspA1-His fusion as solid phase carrier, the color quantum point respectively anti-human IgM, IgG nano-probe of mark, as detecting antibody, is set up the detection system of moraxelle catarrhalis antibody.Consumption to carboxyl nanometer magnetic bead in detection system respectively, the conditions such as capture time have been carried out a series of optimization and have been selected.
Test the selection of 1. carboxyl nanometer magnetic bead additions
5 μ l, 10 μ l, 15 μ l, 20 μ l, 30 μ l, 50 μ l, 70 μ l are joined respectively to 0.5ml containing in the human serum dilution of anti-moraxelle catarrhalis IgG antibody by the made anti-moraxelle catarrhalis antibody capture nanometer magnetic bead of getting ready of embodiment 2, carry out immunocapture, again by the described color quantum point of embodiment 3 respectively anti-human IgM, the IgG nano-probe of mark detect, record fluorescent value.Found that, along with the increase of carboxyl nanometer magnetic bead addition, fluorescent value increases gradually, and when carboxyl nanometer magnetic bead addition reaches 20 μ l, it is maximum that fluorescent value reaches.Continue to increase again the amount of carboxyl nanometer magnetic bead, fluorescent value reduces on the contrary.Therefore this experimental selection 20 μ l are as the optimal addn of nanometer magnetic bead.
Test the selection of 2. immunocapture times
Determine after the addition of magnetic bead, get four parts of made nanometer magnetic beads of getting ready of embodiment 2, at room temperature with 10r/min, antagonism moraxelle catarrhalis IgM Positive Sera carries out the immunocapture of 5min, 10min, 15min, 20min, 30min and 40min, by the described quantum dot-labeled probe of embodiment 3, detected again, record fluorescent value.Found that, fluorescent value shows maximal value when immunocapture 10min, and along with the prolongation of time, numerical value is substantially constant.Therefore this experimental selection 10min is as the Best Times of immunocapture.
Simultaneously, using coupling the carboxyl nanometer magnetic bead of restructuring UspA1-His fusion as solid phase carrier, corresponding quantum dot-labeled mouse-anti human IgG monoclonal antibody is as detecting antibody, the detection system of setting up anti-moraxelle catarrhalis IgG antibody, is optimized the contact conditions in corresponding detection system.Found that, the best capture condition in above-mentioned detection system is all in full accord with above-mentioned experiment 1 and experiment 2 given results.
The preparation of embodiment 5 PBST damping fluids
Get 8g NaCL, 0.2g KCl, 0.24 KH 2pO 4, 1.44g Na 2hPO 4, 5g BSA, 0.3g NaN 3, 0.5 ml Tween-20 is dissolved in 900ml distilled water, adjusts pH to 7.4, then be settled to 1000ml with 5M NaOH.
The preparation of embodiment 6 quality-control products
6.1) positive quality control product:
6.1.1) anti-moraxelle catarrhalis IgM antibody positive quality-control product: the definite positive serum of anti-moraxelle catarrhalis IgM antibody by 0.5ml moraxelle catarrhalis the infected forms;
6.1.2) anti-moraxelle catarrhalis IgG antibody positive quality-control product: the definite positive serum of anti-moraxelle catarrhalis IgG antibody by 0.5ml moraxelle catarrhalis the infected forms;
6.2) negative quality-control product: by the anti-moraxelle catarrhalis IgM of 0.5ml, IgG antibody all negative human serum form.
The preparation of embodiment 7 kits
A set of common anti-moraxelle catarrhalis IgM, the IgG antibody forming based on magnetic resolution and color quantum point mark of anti-human IgM, IgG nano-probe 5ml, the described PBST damping fluid of embodiment 5 200ml, the described quality-control product of embodiment 6 by the described color quantum point difference of the described anti-moraxelle catarrhalis antibody capture nanometer magnetic bead 2ml of embodiment 2, embodiment 3 mark is total to check reagent box fast.
Determining of embodiment 8 serum dilution to be checked
With clinical the whole bag of tricks, be all defined as anti-moraxelle catarrhalis IgM antibody and be respectively each 20 parts, negative and positive human serum sample, with PBSA damping fluid, carry out respectively 1:50, l:lOO, 1:200, l:400,1:800,1:1600 doubly dilutes, and selects the high dilution of ratio >3 of positive serum and the detection fluorescence numerical value of negative serum as the suitableeest working concentration of serum to be checked.Found that the best results of 200 times of dilutions.
Equally, with clinical the whole bag of tricks, be all defined as anti-moraxelle catarrhalis IgG antibody and be respectively each 20 parts, negative and positive human serum sample, with PBSA damping fluid, carry out respectively 1:50, l:lOO, 1:200, l:400,1:800,1:1600 doubly dilutes, and selects the high dilution of ratio >3 of positive serum and the detection fluorescence numerical value of negative serum as the suitableeest working concentration of serum to be checked.Result is also found, the best results of 200 times of dilutions.
The using method of embodiment 9 kits
1) get after serum sample 5 μ l to be checked dilute (200 times of dilutions) with 995 μ l PBSA damping fluids dilution is proceeded in the common centrifuge tube of 1.5ml;
2) to step 1) in centrifuge tube in add successively the anti-moraxelle catarrhalis IgM based on magnetic resolution and color quantum point mark, IgG antibody is total to anti-moraxelle catarrhalis antibody capture nanometer magnetic bead 20 μ l and the anti-moraxelle catarrhalis IgM based on magnetic resolution and color quantum point mark in check reagent box fast, IgG antibody is total to the anti-human IgM of the color quantum point difference mark in check reagent box fast, IgG nano-probe 50 μ l, after reacting 10min with 10rpm/min on rotation mixed instrument under room temperature, take off, centrifuge tube is inserted to the separated 3min of nano magnetic separation vessel magnetic, with pipettor sucking-off supernatant,
3) adding the anti-moraxelle catarrhalis IgM based on magnetic resolution and color quantum point mark, the PBST damping fluid 1ml that IgG antibody is total in check reagent box fast washs twice, sucking-off cleansing solution after the separation of employing nano magnetic separation vessel magnetic, finally use the resuspended magnetic bead of 0.2ml PBS damping fluid, make nanometer magnetic bead-moraxelle catarrhalis antibody-quantum dot " sandwich " compound;
4) by step 3) 0.2ml nanometer magnetic bead-moraxelle catarrhalis antibody-quantum dot compound of obtaining is loaded in ELISA Plate, use fluorescence microplate reader to be all 365nm in excitation wavelength (Ex), emission wavelength (Em) is respectively under the parameter of 520nm and 600 nm distinguishes reading to its fluorescent value respectively;
5) determining of CUT-OFF value: by and above-mentioned steps 1)-4) same method detects 100 parts and is all defined as all negative human serum samples of anti-moraxelle catarrhalis IgM, IgG antibody through clinical the whole bag of tricks, read respectively emission wavelength (Em) and be respectively the fluorescent value under 520nm and 600nm; Described 100 parts of mean values (52.2) that are all defined as anti-moraxelle catarrhalis IgM, the IgG antibody fluorescent value that all negative human serum sample is 520nm at emission wavelength (Em) through clinical the whole bag of tricks are designated as CUT-OFF1 value (83.28) with 3 times of standard deviations (10.36) sum; Described 100 parts of mean values (67.5) that are all defined as anti-moraxelle catarrhalis IgM, the IgG antibody fluorescent value that all negative human serum sample is 600nm at emission wavelength (Em) through clinical the whole bag of tricks are designated as CUT-OFF2 value (108.9) with 3 times of standard deviations (13.8) sum;
6) by and above-mentioned steps 1)-4) four parts of negative quality-control product samples and four parts of positive quality control product samples that identical method provides in detection kit simultaneously, read respectively emission wavelength (Em) and be respectively the fluorescent value under 520nm and 600nm; The mean value of the fluorescent value that four parts of negative quality-control product samples are 520nm at emission wavelength (Em) is designated as NCX1; The mean value of the fluorescent value that four parts of negative quality-control product samples are 600nm at emission wavelength (Em) is designated as NCX2 value; Two parts of anti-moraxelle catarrhalis IgM antibody positive quality-control product samples emission wavelength (Em) for the fluorescence mean value of 520nm be PCX1; Two parts of anti-moraxelle catarrhalis IgG antibody positive quality-control product samples emission wavelength (Em) for and 600nm under fluorescent value be designated as PCX2; If step 4) in, serum sample to be checked, at emission wavelength (Em) for the detection fluorescent value of 520nm is greater than CUT-OFF1 value (83.28) and PCX1/NCX1 >=2.1, is judged as in serum sample to be checked anti-moraxelle catarrhalis IgM antibody positive; If step 4) in, serum sample to be checked is at emission wavelength (Em) for the detection fluorescent value of 520nm is less than CUT-OFF1 value (83.28) and PCX1/NCX1 >=2.1, and in judgement behaviour serum sample to be checked, anti-moraxelle catarrhalis IgM antibody is negative; If step 4) in, serum sample to be checked, at emission wavelength (Em) for the detection fluorescent value of 600nm is greater than CUT-OFF2 value (108.9) and PCX2/NCX2 >=2.1, is judged as in serum sample to be checked anti-moraxelle catarrhalis IgG antibody positive; If step 4) in, serum sample to be checked, at emission wavelength (Em) for the detection fluorescent value of 600nm is less than CUT-OFF2 value (108.9) and PCX2/NCX2 >=2.1, is judged as in serum sample to be checked anti-moraxelle catarrhalis IgG antibody negative; If PCX1/NCX1 < 2.1 or PCX2/NCX2 < 2.1, all show that kit lost efficacy.
The specific test of embodiment 10 kits
With the serum that respiratory tract common disease substance is positive as human respiratory syncytial virus, people's mycoplasma pneumoniae, people's Chlamydia pneumoniae, adenovirus hominis 3 types, adenovirus hominis 7 types, influenza virus A hominis, people's influenza B virus, human influenza haemophilus, people's streptococcus pneumoniae infection person's corresponding pathogen antigen, replace moraxelle catarrhalis Positive Sera to detect by the method as described in embodiment 9 with the kit as described in embodiment 7, find that testing result is all negative.
Embodiment 11 clinical trial examples
The anti-moraxelle catarrhalis IgM based on magnetic resolution and color quantum point mark for preparing of application the present invention, IgG antibody fast altogether check reagent box 80 parts, 160 parts clear and definite, anti-moraxelle catarrhalis IgM Positive Sera sample of clinical diagnosis and negative serum sample detected, testing result is as table 1.
The clinical serum test result of the anti-moraxelle catarrhalis IgM of table 1 antibody
The anti-moraxelle catarrhalis IgM based on magnetic resolution and color quantum point mark for preparing of application the present invention, IgG antibody fast altogether check reagent box 40 parts, 60 parts clear and definite, anti-moraxelle catarrhalis IgG Positive Sera sample of clinical diagnosis and negative serum sample detected, testing result is as table 2.
The clinical serum test result of the anti-moraxelle catarrhalis IgG of table 2 antibody
It is pointed out that and the foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of making within the present invention spirit and principle, be equal within replacement etc. all should be included in protection scope of the present invention.

Claims (8)

1. the method that the anti-moraxelle catarrhalis IgM based on magnetic resolution and color quantum point mark, IgG antibody are examined fast altogether, is characterized in that: said method comprising the steps of:
1) preparation of restructuring moraxelle catarrhalis Membrane protein antigen UspA1;
2) by step 1) the restructuring moraxelle catarrhalis Membrane protein antigen UspA1 for preparing and nanometer magnetic bead be by covalent coupling, makes anti-moraxelle catarrhalis antibody capture nanometer magnetic bead;
3) nano-quantum point that is 520nm by mouse-anti people IgM monoclonal antibody and emission wavelength, by covalent coupling, is prepared quantum dot-labeled anti-human IgM nano-probe; The nano-quantum point that is 600nm by mouse-anti human IgG monoclonal antibody and emission wavelength, by covalent coupling, is prepared quantum dot-labeled anti-human IgG nano-probe; Quantum dot-labeled anti-human IgM nano-probe and quantum dot-labeled anti-human IgG nano-probe mixed in equal amounts are made to color quantum point anti-human IgM, the IgG nano-probe of mark respectively;
4) get human serum sample, after suitably diluting with PBSA damping fluid, in serum dilution, add step 2 respectively) the anti-moraxelle catarrhalis antibody capture nanometer magnetic bead and the step 3 that prepare) color quantum point for preparing anti-human IgM, the IgG nano-probe of mark respectively, fully mix, after reaction 5-45min, carry out magnetic separation, after PBST damping fluid washing 2 times, use fluorescence microplate reader, at emission wavelength, be respectively and under 520nm and 600nm, read respectively fluorescent value; In described PBSA damping fluid, each component concentration is respectively 8g/L NaCL, 0.2g/LKCl, 0.24g/L KH 2pO 4, 1.44g/L Na 2hPO 4, 5g/L BSA, the pH=7.4 of described PBSA damping fluid; In described PBST damping fluid, each component concentration is respectively 8g/L NaCL, 0.2g/L KCl, 0.24g/L KH 2pO 4, 1.44g/L Na 2hPO 4, 5g/L BSA, 0.3g/L NaN 3, 0.5ml/L Tween-20, the pH=7.4 of described PBST damping fluid;
5) according to step 4) method detect at least 30 parts and be all defined as all negative human serum samples of anti-moraxelle catarrhalis IgM, IgG antibody through clinical the whole bag of tricks, read respectively emission wavelength and be respectively the fluorescent value under 520nm and 600nm; Described anti-moraxelle catarrhalis IgM, IgG antibody all negative human serum sample are called for short moraxelle catarrhalis negative antibody control sample; Mean value and 3 times of standard deviation sums of the fluorescent value that described moraxelle catarrhalis negative antibody control sample is 520nm at emission wavelength are designated as CUT-OFF1 value; Mean value and 3 times of standard deviation sums of the fluorescent value that described moraxelle catarrhalis negative antibody control sample is 600nm at emission wavelength are designated as CUT-OFF2 value;
If step 4) in, human serum sample is 520nm at emission wavelength detection fluorescent value is greater than CUT-OFF1 value, is judged as in human serum sample anti-moraxelle catarrhalis IgM antibody positive;
If step 4) in, human serum sample is 520nm at emission wavelength detection fluorescent value is less than CUT-OFF1 value, is judged as in human serum sample anti-moraxelle catarrhalis IgM antibody negative;
If step 4) in, human serum sample is 600nm at emission wavelength detection fluorescent value is greater than CUT-OFF2 value, is judged as in human serum sample anti-moraxelle catarrhalis IgG antibody positive;
If step 4) in, human serum sample is 600nm at emission wavelength detection fluorescent value is less than CUT-OFF2 value, is judged as in human serum sample anti-moraxelle catarrhalis IgG antibody negative.
2. the anti-moraxelle catarrhalis IgM based on magnetic resolution and color quantum point mark, IgG antibody are total to a check reagent box fast, it is characterized in that: described anti-moraxelle catarrhalis IgM, IgG antibody based on magnetic resolution and color quantum point mark is total to check reagent box fast, and by anti-moraxelle catarrhalis antibody capture nanometer magnetic bead, the color quantum point with the anti-moraxelle catarrhalis IgM of enrichment, IgG antibody function, anti-human IgM, IgG antibody nano-probe, quality-control product and the PBST damping fluid of mark are formed respectively; Described quality-control product comprises positive quality control product and negative quality-control product; Described positive quality control product is comprised of serum and two parts of positive serum of anti-moraxelle catarrhalis IgG antibody of two parts of moraxelle catarrhalis the infecteds' anti-moraxelle catarrhalis IgM antibody positive; Described negative quality-control product is all negative human serums of four parts of anti-moraxelle catarrhalis IgM, IgG antibody.
3. for the preparation of anti-moraxelle catarrhalis IgM, the IgG antibody based on magnetic resolution and color quantum point mark as claimed in claim 2, be total to fast a method for check reagent box, it is characterized in that: said method comprising the steps of:
1) preparation of anti-moraxelle catarrhalis antibody capture nanometer magnetic bead:
1.1) preparation, the purifying of restructuring UspA1-His fusion:
1.1.1) moraxelle catarrhalis outer membrane protein UspA1 is carried out to bioinformatic analysis, obtain the abundantest peptide section of epitope in moraxelle catarrhalis UspA1 albumen ectodomain, find its corresponding gene order;
1.1.2) at step 1.1.1) in resulting gene order 5 ' end and 3 ' end introduce respectively restriction enzyme site chemosynthesis complete genome sequence, with tense marker, be designated as UspA1;
1.1.3) by step 1.1.2) in resulting UspA1 by molecular biology method, be cloned into and proceed to expression in escherichia coli restructuring UspA1-His fusion after expression vector pET-28a (+); Described restructuring UspA1-His fusion is present in genetic engineering thalline with inclusion body expression-form;
1.1.4) with ni-sepharose purification step 1.1.3) resulting restructuring UspA1-His fusion, SDS-PAGE detects after its purity, again restructuring UspA1-His fusion is carried out to renaturation, after bradford kit carries out determination of protein concentration, with PBS damping fluid, adjusting concentration is 0.2mg/mL; In described PBS damping fluid, each component content is as follows: 8g/L NaCL, 0.2g/L KCl, 0.24g/L KH 2pO 4, 1.44g/L Na 2hPO 4, the pH=7.4 of described PBS damping fluid;
1.2) nanometer magnetic bead is coated:
1.2.1) get 5mg magnetic bead, with 1ml MES damping fluid washing three times, be placed in nano magnetic separation vessel and carry out removing supernatant after magnetic separation; Described magnetic bead is with superparamagnetism Fe 3o 4for kernel, the particle diameter carboxyl magnetic bead that is 1150nm; Described MES damping fluid is that mass concentration is 2-(N-morpholino) ethyl sulfonic acid of 2g/L; The pH=6.0 of described MES damping fluid; The magnetic intensity of described nano magnetic separation vessel is 0.4T;
1.2.2) add successively and use step 1.2.1) in the concentration of MES damping fluid preparation be the EDC solution of 8-12mg/ml and use step 1.2.1) in the concentration prepared of MES damping fluid be each 0.5ml of sulfo-NHS solution of 6-10mg/ml, with 10-40rpm/min, in rotation mixed instrument, activate 1hr, being placed in nano magnetic separation vessel carries out removing supernatant after magnetic separation, with 1ml step 1.2.1) in MES damping fluid resuspended, the magnetic bead after being activated;
1.2.3) get 5 centrifuge tubes, in each centrifuge tube, add 200 μ L step 1.2.2) magnetic bead after resulting activation, being placed in nano magnetic separation vessel carries out removing supernatant after magnetic separation, to add in each centrifuge tube concentration with the dilution of PBS damping fluid be 50-200 μ g/ml by step 1.1.4) prepared each 1ml of restructuring UspA1-His fusion solution, under room temperature, with 15rpm/min, in rotation mixed instrument, react 2-6h, being placed in nano magnetic separation vessel carries out removing after supernatant after magnetic separation, respectively add 1ml to contain the above-mentioned PBS damping fluid of 1mg/ml monoethanolamine, under room temperature with 15rpm/min in rotation react in mixed instrument 2h with sealing magnetic bead on not with the carboxyl of antibody response, in described PBS damping fluid, each component content is as follows: 8g/L NaCL, 0.2g/L KCl, 0.24g/L KH 2pO 4, 1.44g/L Na 2hPO 4, the pH=7.4 of described PBS damping fluid,
1.2.4) after capping completes, these 5 centrifuge tubes are placed in to nano magnetic separation vessel and carry out removing supernatant after magnetic separation, each washs three times with 1ml lavation buffer solution; In described lavation buffer solution, each component content is as follows: 8g/L NaCL, 0.2g/L KCl, 0.24g/L KH 2pO 4, 1.44g/L Na 2hPO 4, 0.5ml/L Tween-20, the pH=7.4 of described lavation buffer solution;
1.2.5) in each centrifuge tube, add respectively 1ml to preserve the resuspended magnetic bead of damping fluid, be placed in 4 ℃ and save backup; So far make anti-moraxelle catarrhalis antibody capture nanometer magnetic bead; In described preservation damping fluid, each component content is as follows: 8g/L NaCL, 0.2g/L KCl, 0.24g/L KH 2pO 4, 1.44g/L Na 2hPO 4, 0.3g/LNaN 3, 5g/L BSA, the pH=7.4 of described preservation damping fluid;
2) the color quantum point difference anti-human IgM of mark is, the preparation of IgG nano-probe:
Its concrete preparation method comprises:
2.1) in microcentrifugal tube, add successively 2nmol carboxyl water-soluble quantum dot, 300nmol N-hydroxy-succinamide sulfo-NHS and 300nmol carbodiimide EDC, take phosphate buffer constant volume as 5ml, mixed solution, after 37 ℃ of reaction 30min, the excessive sulfo-NHS as activator and EDC, the quantum dot after being activated are removed in dialysis; The emission wavelength of described carboxyl water-soluble quantum dot is 520nm; In described phosphate buffer, each component content is as follows: 2.9g/L sodium hydrogen phosphate, 0.295g/L sodium dihydrogen phosphate, 4g/L sodium chloride; The pH=7.4 of described phosphate buffer;
2.2) in step 2.1) in the quantum dot of resulting activation, add the mouse-anti people IgM monoclonal antibody of 2-12nmol, lucifuge reaction 2h, adds single-ended amination polyglycol PEG2000-NH 2to final concentration be 1%, seal unreacted activated carboxyl site, continue lucifuge reaction 1h;
2.3) with 0.2 μ m PES filter, remove by filter step 2.2) in antibody aggregation thing, then filtrate is transferred in 50000MW ultra-filtration centrifuge tube, with 8000g centrifugal force centrifugal 15min at 4 ℃, remove the antibody of coupling reaction and the accessory substance in reaction do not occur;
2.4) collect step 2.3) middle ultra-filtration centrifuge tube filter membrane upper strata quantum dot-antibody coupling matter solution, be dissolved in 2ml phosphate cleansing solution, again this solution is transferred in a new 50000MW ultra-filtration centrifuge tube, with 8000g centrifugal force centrifugal 15min at 4 ℃, collect ultra-filtration centrifuge tube filter membrane upper strata quantum dot-antibody coupling matter solution, be dissolved in 1ml phosphate and preserve in liquid, be placed in 4 ℃ and save backup, so far make quantum dot-labeled anti-human IgM nano-probe; In described phosphate cleansing solution, each component content is as follows: 2.9g/L sodium hydrogen phosphate, 0.295g/L sodium dihydrogen phosphate, 4g/L sodium chloride, 5ml/L Tween-20,0.3g/L Sodium azide, the pH=7.4 of described phosphate cleansing solution; In described phosphate preservation liquid, each component content is as follows: 2.9g/L sodium hydrogen phosphate, 0.295g/L sodium dihydrogen phosphate, 2g/L sodium chloride, 10g/L bovine serum albumin(BSA), 0.3g/L Sodium azide; Described phosphate is preserved the pH=7.4 of liquid;
2.5) by and step 2.1)-2.4) identical method utilizes the carboxyl water-soluble quantum dot that mouse-anti human IgG monoclonal antibody and emission wavelength are 600nm to make quantum dot-labeled anti-human IgG nano-probe; By the 1:1 mixing by volume of above-mentioned two kinds of quantum dot-labeled nano-probe solution, make color quantum point anti-human IgM, the IgG nano-probe of mark respectively;
3) preparation of PBST damping fluid:
Its concrete compound method comprises:
Get 8g NaCL, 0.2g KCl, 0.24 KH 2pO 4, 1.44g Na 2hPO 4, 5g BSA, 0.3g NaN 3, 0.5ml Tween-20 is dissolved in 900ml distilled water, adjusts pH to 7.4, then be settled to 1000ml with 5M NaOH;
4) preparation of quality-control product:
4.1) positive quality control product:
4.1.1) anti-moraxelle catarrhalis IgM antibody positive quality-control product: the definite positive serum of anti-moraxelle catarrhalis IgM antibody by 0.5ml moraxelle catarrhalis the infected forms;
4.1.2) anti-moraxelle catarrhalis IgG antibody positive quality-control product: the definite positive serum of anti-moraxelle catarrhalis IgG antibody by 0.5ml moraxelle catarrhalis the infected forms;
4.2) negative quality-control product: by the anti-moraxelle catarrhalis IgM of 0.5ml, IgG antibody all negative human serum form.
4. method according to claim 3, it is characterized in that: described step 1.2.2), add successively and use step 1.2.1) in the concentration of MES damping fluid preparation be the EDC solution of 10mg/ml and use step 1.2.1) in the concentration prepared of MES damping fluid be each 0.5ml of sulfo-NHS solution of 8mg/ml, with 15rpm/min, in rotation mixed instrument, activate 1hr, being placed in nano magnetic separation vessel carries out removing supernatant after magnetic separation, with 1ml step 1.2.1) in MES damping fluid resuspended, the magnetic bead after being activated;
Described step 1.2.3) in, to add in each centrifuge tube concentration with the dilution of PBS damping fluid be 120 μ g/ml by step 1.1.4) prepared each 1ml of restructuring UspA1-His fusion solution, under room temperature, with 15rpm/min, in rotation mixed instrument, react 3h, be placed in nano magnetic separation vessel and carry out removing after supernatant after magnetic separation, respectively add 1ml to contain the above-mentioned PBS damping fluid of 1mg/ml monoethanolamine;
Described step 2.2) in, in step 2.1) in the quantum dot of resulting activation, add the mouse-anti people IgM monoclonal antibody of 6nmol, lucifuge reaction 2h.
5. according to the method described in claim 3 or 4, it is characterized in that: described quantum dot is water-soluble CdSe/ZnS quantum dot that carboxylated amphipathic polymer is modified.
6. method according to claim 5, is characterized in that: described magnetic bead is with superparamagnetism Fe 3o 4for kernel, shell material are that polystyrene, surface functional group are the carboxyl magnetic bead that carboxyl, particle diameter are 1150nm.
7. based on anti-moraxelle catarrhalis IgM, the IgG antibody based on magnetic resolution and color quantum point mark as claimed in claim 2, be total to fast a using method for check reagent box, it is characterized in that: described using method comprises the following steps:
1) get serum sample 5 μ l to be checked with after 995 μ l PBSA damping fluid dilutions, dilution being proceeded in the common centrifuge tube of 1.5ml; In described PBSA damping fluid, each component content is as follows: 8g/L NaCL, 0.2g/L KCl, 0.24g/L KH 2pO 4, 1.44g/L Na 2hPO 4, 5g/L BSA; The pH=7.4 of described PBSA damping fluid;
2) to step 1) in centrifuge tube in add successively the anti-moraxelle catarrhalis IgM based on magnetic resolution and color quantum point mark, IgG antibody is total to anti-moraxelle catarrhalis antibody capture nanometer magnetic bead 10-100 μ l and the anti-moraxelle catarrhalis IgM based on magnetic resolution and color quantum point mark in check reagent box fast, IgG antibody is total to the anti-human IgM of the color quantum point difference mark in check reagent box fast, IgG nano-probe 50 μ l, after reacting 5-25min with 10rpm/min on rotation mixed instrument under room temperature, take off, centrifuge tube is inserted to the separated 3min of nano magnetic separation vessel magnetic, with pipettor sucking-off supernatant,
3) adding the anti-moraxelle catarrhalis IgM based on magnetic resolution and color quantum point mark, the PBST damping fluid 1ml that IgG antibody is total in check reagent box fast washs twice, sucking-off cleansing solution after the separation of employing nano magnetic separation vessel magnetic, finally use the resuspended magnetic bead of 0.2ml PBS damping fluid, make nanometer magnetic bead-moraxelle catarrhalis antibody-quantum dot " sandwich " compound; In described PBS damping fluid, each component content is as follows: 8g/L NaCL, 0.2g/L KCl, 0.24g/L KH 2pO 4, 1.44g/L Na 2hPO 4; The pH=7.4 of described PBS damping fluid;
4) by step 3) nanometer magnetic bead-moraxelle catarrhalis antibody-quantum dot compound of obtaining is loaded in ELISA Plate, use fluorescence microplate reader to be all 365nm in excitation wavelength, emission wavelength is respectively under the parameter of 520nm and 600nm distinguishes reading to its fluorescent value respectively;
5) by above-mentioned same method, detect at least 30 parts and be all defined as all negative human serum samples of anti-moraxelle catarrhalis IgM, IgG antibody through clinical the whole bag of tricks, read respectively emission wavelength and be respectively the fluorescent value under 520nm and 600nm;
Described mean value and the 3 times of standard deviation sums that are all defined as anti-moraxelle catarrhalis IgM, the IgG antibody fluorescent value that all negative human serum sample is 520nm at emission wavelength through clinical the whole bag of tricks are designated as CUT-OFF1 value; Described mean value and the 3 times of standard deviation sums that are all defined as anti-moraxelle catarrhalis IgM, the IgG antibody fluorescent value that all negative human serum sample is 600nm at emission wavelength through clinical the whole bag of tricks are designated as CUT-OFF2 value; The four parts of negative quality-control product samples and the four parts of positive quality control product samples that in detection kit, provide read respectively emission wavelength and are respectively the fluorescent value under 520nm and 600nm simultaneously; The mean value of the fluorescent value that four parts of negative quality-control product samples are 520nm at emission wavelength is designated as NCX1; The mean value of the fluorescent value that four parts of negative quality-control product samples are 600nm at emission wavelength is designated as NCX2 value; The fluorescence mean value that two parts of anti-moraxelle catarrhalis IgM antibody positive quality-control product samples are 520nm at emission wavelength is PCX1; Two parts of anti-moraxelle catarrhalis IgG antibody positive quality-control product samples emission wavelength for and 600nm under fluorescent value be designated as PCX2;
If step 4) the detection fluorescent value that in, serum sample to be checked is 520nm at emission wavelength is greater than CUT-OFF1 value and PCX1/NCX1 >=2.1, is judged as in serum sample to be checked anti-moraxelle catarrhalis IgM antibody positive;
If step 4) the detection fluorescent value that in, sample to be checked is 520nm at emission wavelength is less than CUT-OFF1 value and PCX1/NCX1 >=2.1, and in judgement behaviour serum sample to be checked, anti-moraxelle catarrhalis IgM antibody is negative;
If step 4) the detection fluorescent value that in, serum sample to be checked is 600nm at emission wavelength is greater than CUT-OFF2 value and PCX2/NCX2 >=2.1, is judged as in serum sample to be checked anti-moraxelle catarrhalis IgG antibody positive;
If step 4) the detection fluorescent value that in, serum sample to be checked is 600nm at emission wavelength is less than CUT-OFF2 value and PCX2/NCX2 >=2.1, is judged as in serum sample to be checked anti-moraxelle catarrhalis IgG antibody negative;
If PCX1/NCX1 < 2.1 or PCX2/NCX2 < 2.1, all show that kit lost efficacy.
8. method according to claim 7, it is characterized in that: described step 2), to step 1) in centrifuge tube in add successively the anti-moraxelle catarrhalis IgM based on magnetic resolution and color quantum point mark, IgG antibody is total to anti-moraxelle catarrhalis antibody capture nanometer magnetic bead 20 μ l and the anti-moraxelle catarrhalis IgM based on magnetic resolution and color quantum point mark in check reagent box fast, IgG antibody is total to the anti-human IgM of the color quantum point difference mark in check reagent box fast, IgG nano-probe 50 μ l, after reacting 10min with 10rpm/min on rotation mixed instrument under room temperature, take off, centrifuge tube is inserted to the separated 3min of nano magnetic separation vessel magnetic, with pipettor sucking-off supernatant.
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CN110568204A (en) * 2019-06-10 2019-12-13 青岛海润检测股份有限公司 Chemiluminescence kit for one-step quantitative detection of canine distemper virus-canine parvovirus antibody
CN110568204B (en) * 2019-06-10 2022-04-01 青岛海润检测股份有限公司 Chemiluminescence kit for one-step quantitative detection of canine distemper virus-canine parvovirus antibody

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