CN104297466A - Anti-I2 antibody chromatography test strip and purpose thereof - Google Patents
Anti-I2 antibody chromatography test strip and purpose thereof Download PDFInfo
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Abstract
The invention discloses an anti-I2 antibody chromatography test strip, a preparation method and a purpose thereof. The test strip comprises a sample pad (1), a combination pad (2), an analysis membrane (3), a water absorption pad (6), a base plate (7), an inspection band line T (4) and a quality control band line C (5), wherein the analysis membrane is attached to the upper part of the base plate; the combination pad and the water absorption pad are respectively attached to two ends of the upper part of the analysis membrane; the sample pad is attached to one end of the upper part of the combination pad; and the inspection band line T and the quality control band line C are arranged on the analysis membrane. The I2 antigen protein is used for realizing rapid detection with high sensitivity and high specificity on the anti-CBir1 antibody in the sample by employing an indirect immunodetection method, and provides basis for auxiliary diagnosis of autoimmune diseases such as clinic inflammatory bowel disease.
Description
Technical field
The present invention relates to field of immunoassay detection.Specifically, the present invention relates to the anti-I2 antibody immune chromatography Test paper of a kind of detection, preparation method and application thereof.
Background technology
Inflammatory bowel disease (inflammatory bowel disease, IBD) be a kind of cause of disease chronic nonspecific inflammatory bowel disease still not fully aware of, comprise ulcerative colitis (Ulcerative colitis, and Crohn disease (Crohn ' s disease, CD) UC).Crohn disease was described in 1932 the earliest by Crohn, Ginzterg and Oppenheime, therefore obtained this name.1973, this disease was named as Crohn is sick by the council of medical science international organization of the World Health Organization (WHO).Its feature is that the cause of disease is not bright, is more common in young people, shows as granulomatous inflammation pathology, merges fiberization and ulcer.Can invade and complete GI any position, comprise oral cavity, anus, pathology is segmental or jumping characteristic distribution, and can to invade and beyond enteron aisle, particularly skin.Clinical manifestation is diversified because diseased region, scope and degree are different, and the course of disease is slow, easily recurs.
IBD is the common disease in North America and Europe, and over nearly 30 years, the Japanese IBD incidence of disease is also in progressively increasing trend, though China there is no the epidemiologic data of general population, the medical number of this disease is in progressively increasing trend then clearly during the nearly last ten years.The complicated clinical manifestation of IBD is various, not only has symptom of digestive tract, and intestines also can be had outward to show.Because symptom is non-specific enteritis performances such as suffering from abdominal pain, suffer from diarrhoea, have blood in stool, CD and UC and other enteron aisle chronic diseases such as IBD and tuberculous enteritis are difficult to antidiastole, special in inorganizable evidence, need have more heterogeneous is that diagnosis is offered help to specific mark.Research finds, the bioactive marker of multiple Noninvasive to the diagnosis of IBD and the evaluation of course inflammatory activity significant.
The biomarker of current discriminating UC and CD mainly concentrates on autoimmune antibody and antimicrobial antibody, I2 (Pseudomonas-associated sequence I2) is a kind of albumen found on activity CD patient pathology intestinal mucosa, by amino acid sequence analysis, find that I2 is one section of sequence of a kind of intestinal tract normal flora Pseudomonas fluorescens (pseudomonas fluorescens) pfiT gene.Research shows, the IgA antibody of the anti-I2 of nearly 20 ~ 30%CD patients serum is positive, and the IgA antibody of anti-I2 in normal person and non-CD intestines problem patient is seldom detected.Therefore, the IgA antibody detection of anti-I2 is one of efficiency index of CD diagnosis.
Patent of invention " a kind of IgA antibody detection kit " (application number 201310062239.7) discloses four sections of antigen sequences of I2 first, and achieve the detection to I2 antibody I gA anti-in sample with chemoluminescence method, the present invention obtains I2 antigen protein with gene recombination method on this basis, and achieves the immunochromatography detection of anti-I2 antibody with this antigen protein.Compared with documents chemoluminescence method, the epitope that the present invention's antigen protein used is announced than 201310062239.7 patents of invention is more, and when prompting same method detects, sensitivity is higher; Secondly, the immuno-chromatographic test paper strip of the present invention's collaurum/colored latex mark preparation, makes detection more easy.
Immunochromatographic method (Immunochromatography) is a kind of quick diagnosis technology of rising in recent years, its principle is a certain zone special antibody being first fixed on nitrocellulose filter or cellulose acetate membrane, after sample (urine or serum) is immersed in cellulose one end of this drying, due to capillarity, sample will move forward along this film, when moving to the region being fixed with antibody, in sample corresponding antigen namely with this antibody generation specific binding, form macroscopic detection zone.The trace labelling particle that existing immuno-chromatographic test paper strip product is conventional has nm of gold, nanometer selenium, colored latex etc., and be wherein most widely used with nm of gold, nm of gold is also referred to as collaurum.
Immune colloidal gold technique (Immune colloidal gold technique, GICT) is called using collaurum as the immunochromatography technique spy of missing label.Collaurum be by gold chloride (HAuCl4) at reductive agent as under the effect such as white phosphorus, ascorbic acid, sodium citrate, tannic acid, polymerization becomes the gold grain of specific size, and gains the name because electrostatic interaction becomes a kind of stable colloidal state.Collaurum is electronegative under mild alkaline conditions, can be formed firmly be combined, because this combination is electrostatical binding, so do not affect the biological nature of protein with the positive charge group of protein molecule.Collaurum except with protein bound except, can also be combined, as SPA, PHA, ConA etc. with other biomacromolecules many.According to some physical behaviors of collaurum, as high electron density, grain size, shape and color reaction, add immunity and the biological characteristics of bond, thus make collaurum be widely used in the fields such as immunology, histology, pathology and cell biology.
The colored latex microsphere of surface band reactive group also can as the tracer agent of immunochromatography, the same with colloidal gold technique, colored latex mark immunity-chromatography technology also have easy and simple to handle, stable reagent, fast go out result, can the advantage such as room temperature preservation.Colored latex mark is by different-diameter scope 0.1 μM ~ 1 μM colored latex microsphere and containing ester class or other macromolecular substances covalent bond such as carboxyl, amino, hydroxyls, make color on these macromolecular marker, when enrichment forms macroscopic color stripes after stopping on detection line or nature controlling line.
Compare with chemoluminescence method with prior art ELISA, the advantage of immunochromatographyassay assay mainly comprises: (1) is fast easy to use, and be convenient to basic unit and use and onsite application, institute responds and can complete in 20 minutes; (2) cost is low, does not need special instrument and equipment; (3) applied range, can adapt to multiple testing conditions; (4) can carry out multinomial detection, if the more difficult acquisition of positive sample, multinomial detection can save sample, reduces costs; (5) label is stablized, and mark sample stores more than 2 year year at 4 DEG C, no signal relaxation phenomenon; (6) collaurum is originally as redness, does not need to add chromogenic agents, eliminates the step of enzyme target carcinogenicity substrate and stop buffer, to human non-toxic's evil.
In autoimmune disease diagnosis, there is more immune chromatography test paper, but at home and abroad still do not come out in market based on the immune chromatography test paper of anti-I2 antibody test.
Summary of the invention
Technical matters to be solved by this invention is to overcome now methodical deficiency, immunochromatographic method is applied in the detection of anti-I2 antibody, adopt indirect immunization to realize and the anti-I2 antibody in sample is detected, by I2 antigen protein being coated in the detection zone of pad or analyzing film, realize special to the height of I2 antibody anti-in sample, high sensitivity, high accuracy detection, rapid screening anti-I2 antibody positive sample, for the autoimmune diseases such as clinical inflammatory enteropathy provide auxiliary diagnosis fast.
An object of the present invention is the immunochromatographydetecting detecting test strip and the preparation method that provide a kind of anti-I2 antibody fast and accurately, and two of object is to provide a kind of anti-I2 antibody detection method based on immunochromatography technique.
As the immunochromatographydetecting detecting test strip of the anti-I2 antibody of the present invention first aspect, comprise sample pad, pad, analyzing film, adsorptive pads and base plate, analyzing film is arranged detection zone and quality control band, the top of described base plate is fitted with analyzing film, the two ends on analyzing film top are fitted with pad and adsorptive pads respectively, and the one end on pad top is fitted with sample pad.
Described pad is 1 layer (Fig. 1) or 2 layers (Fig. 2), wherein 2 layers time stragglyly to overlap with analyzing film.
The preparation method of the immunochromatographydetecting detecting test strip of described anti-I2 antibody, comprises the following steps:
The preparation of step 1.I2 antigen protein
Prepared by step 2. pad (2)
(1) preparation of nano gold mark thing: with the nano-Au solution of 20 ~ 40nm particle diameter mark I2 antigen protein, anti-human IgA antibody, staphylococcal protein A (SPA), streptococcal protein G (Protein G), and other and quality control band C line can form the albumen of immune complex.
(2) preparation of colored latex label: with band active amino or the colored latex mark I2 antigen protein of carboxylic group, anti-human IgA antibody, staphylococcal protein A (SPA), streptococcal protein G (Protein G), and other and quality control band C line can form the albumen of immune complex.
(3) pad (2) preparation: glass fibre membrane or polymer PET are as pad, first use containing BSA and sugared damping fluid pre-service and dry, the nano gold mark thing that step (1) is prepared or latex label, be sprayed on pretreated glass fibre membrane or polymer PET with spraying instrument, drying for standby.
Prepared by step 3. analyzing film (3)
(1) detection zone T line (4) preparation: according to pad labelled protein type selecting detection zone T line coating protein, the coating protein containing I2, detection zone T line as the associated proteins on pad is anti-human IgA.If it is I2 that pad contains anti-human IgA, detection zone T line coating protein.
(2) quality control band C line (5) preparation: according to the coating protein of the labelled protein type selecting quality control band of pad, if pad labelled protein is single I2, the coating protein of quality control band C line is the antibody of anti-I2; If pad labelled protein is single anti-human IgA antibody, the labelled protein of quality control band C line is the antibody of corresponding anti-human IgA antibody; Or other pad labelled proteins form the albumen of immune complex.
Prepared by step 4. sample pad
Glass fibre membrane or polyester film are flooded dry for standby through damping fluid, or directly uses.
Step 5. test strips is assembled
The material completed made by step 1 ~ 4, by Fig. 1 or Fig. 2 overlap joint, cut into certain length and width according to the specification of base plate, in being arranged on base plate and getting stuck.Preferably, test strips length is 6.5cm, and width is 3mm or 4mm.
Described I2 antigen protein is total length I2 gene or the gene order containing important epitope, and be cloned in protokaryon or carrier for expression of eukaryon, expression and purification obtains.
Described I2 antigen protein is with Peptide synthesizer synthesis containing the I2 polypeptide of the important epitope of I2, and is coupled on carrier protein and obtains.
Described anti-human IgA antibody is one or more monoclonal antibodies in mouse source, rabbit source, Yang Yuan, Ma Yuan, camel source or cavy source or polyclonal antibody.
The antibody of described anti-I2 take I2 as immunogenic, one or more monoclonal antibodies in mouse source, rabbit source, Yang Yuan, Ma Yuan, camel source or cavy source or polyclonal antibody.
The antibody of described anti-human IgA antibody refers to and can form the antibody of immune complex with this antibody, and such as this anti-human IgA antibody is mouse-anti people IgA, and its antibody is the antibody of sheep anti mouse IgA or the mouse IgA antibody in other non-mouse sources.
In another aspect of this invention, provide a kind of anti-I2 antibody detection method, by the anti-I2 antibody immune chromatography test strips prepared by first aspect present invention method and step, measuring samples detected, concrete steps:
(1) sample process: get serum, blood plasma or whole blood sample, with sample loading buffer dilution 0 ~ 100 times;
(2) sample drop of above-mentioned process is added in the sample pad of test strips, leaves standstill 5 ~ 20 minutes, observe T line and C line;
(3) result interpretation: T line and C line all manifest, result is positive; T line does not manifest, and C line manifests, and result is negative; T line and C line all do not manifest, and prompting test paper lost efficacy.
Cleaning Principle of the present invention:
Select gold mark/latex etc. to mark I2 antigen protein or other can object is combined in measuring samples albumen, be sprayed on pad, make pad, can be there is immunoreactive albumen with labelled protein-object albumen composition in bag in detection zone, when after in sample application to be checked to sample pad, I2 antibody in sample and the labelled protein on pad form immune complex, due to capillary effect, this compound is to the swimming of adsorptive pads direction, this compound and the antigen protein generation specific immunity association reaction be coated on detection zone T line, form gold mark/latex protein-anti-I2 antibody-I2 antigen protein triplet compound and be trapped within detection line, enrichment forms darker aubergine band or latex colors gradually, because capillary effect continues swimming forward, special immune response is there is and is trapped in gold mark/latex rabbit IgA with the goat-anti rabbit IgA be coated on nature controlling line, be enriched in gradually on nature controlling line and form darker aubergine band or latex colors, unnecessary unconjugated material continues chromatography on adsorptive pads, and what therefore all occur band at detection line and nature controlling line is judged to positive findings, if not containing anti-I2 antibody in blood serum sample, when labelled protein arrives detection line, not with the corresponding protein generation immune response be coated on detection line, therefore not there is developed band at detection line place, and there is special immune response to the corresponding coating protein being coated in nature controlling line place forward and be trapped in gold mark/latex rabbit IgA continuation swimming, be enriched in gradually on nature controlling line and form aubergine band or latex colors, in Quality Control, therefore only occur that band is judged to negative findings.
Immunochromatography technique is applied to anti-I2 antibody test by the present invention first, achieves high specific, highly sensitive detection perform.Compare with chemical luminescence reagent kit with the ELISA of existing bibliographical information, advantage of the present invention mainly comprises: detection time short (5 ~ 20min); Without any need for specific apparatus, can realize bedside detect and outpatient service immediately detect; Easy and simple to handle, only need single step reaction, operating personnel are without the need to training, and testing cost is low; To temperature without particular/special requirement, without the need to freezing, store convenient transportation, room temperature can preserve 24 months.
Accompanying drawing explanation
The side structure schematic diagram 1 of Fig. 1 test strips of the present invention.
The side structure schematic diagram 2 of Fig. 2 test strips of the present invention.
Fig. 3 test strips positive of the present invention and negative findings schematic diagram 3.
Wherein 3a is band schematic diagram; 3b is positive findings; 3c is negative findings; 3d and 3e represents that test strips lost efficacy.
Embodiment
I2 antibody test immune chromatography test paper of the present invention, as shown in Figure 1, this test paper mutually pastes analyzing film (3), pad (2), sample pad (1), adsorptive pads (6) by side in turn with overlapping to opposite side on base plate (7).
Pad (2) is coated with gold mark/latex labelled protein, analyzing film (3) is arranged detection zone (4) and quality control band (5), according to the difference of labelled protein on pad, select corresponding detection zone coating protein and quality control band coating protein.Preferably, the labelled protein that pad sprays is I2 antigen protein and mouse IgA, then the coating protein in detection zone is anti-human IgA antibody, and the coating protein on quality control band is against murine IgA.Another is preferred, and the labelled protein that pad sprays is anti-human IgA antibody, then the coating protein in detection zone is I2 antigen protein.
Below in conjunction with specific embodiments and the drawings, set forth the present invention further.
Prepared by embodiment 1.I2 antigen protein
1) reagent
E. coli host bacteria DH5 α, BL21 (DE3), cloning vector pCR2.1 T-vector, expression plasmid pET28a (+), archaeal dna polymerase rTaq, T4DNA ligase, archaeal dna polymerase rTaq, LA Taq and restriction enzyme BamH I, Hind III and EcoR I, BamH I, DL2000DNA Marker, T4DNA ligase, low-molecular-weight standard protein, DNA glue reclaims kit, IPTG etc.
2) instrument
Common shaking table SCS-24; Water isolation type constant temperature electric heating incubator; Biophotometer spectrophotometer, tabletop refrigerated centrifuge Centrifuge5810R, desk centrifuge MiniSpin; High speed freezing centrifuge; Protein electrophorese instrument and gel imaging system; PCR instrument; Ultrasonic degradation instrument; Constant-temperature metal bath; HIS protein purification post etc.
3) experimental technique
A. vector construction:
Design primer CGC GGA TCC CTG GCC AGC GCC GTG GGC ATC and ATA AGA ATG CGG CCG CGA TCT GCT CAT ACA CGT CACG pcr amplification from template DNA go out I2 fragment, and glue is connected to pCR2.1 cloning vector after reclaiming kit recovery fragment and carries out order-checking qualification.By sequence clone correct for qualification in expression vector pET28a (+), restriction enzyme site is EcoR I, BamH I, carrier has 6 × HIS label simultaneously, is convenient to follow-up protein purification.
B. express
By the Plastid transformation that obtains to e. coli bl21 (DE3), by resistance screening positive expression bacterial strain.By the positive bacteria liquid screened in 1: 1000 ratio inoculation be added with in the LB nutrient culture media of Kan resistance, each bacterium inoculation two pipe, a pipe is used for induction, and another pipe is used for non-induced contrast, will inoculate a pipe empty plasmid bacterium simultaneously and compare.When 37 DEG C of incubated overnight to OD600 values are about 0.4-0.6, it is 1mmol/L that induction pipe and empty control plasmid pipe add IPTG to final concentration, and non-induced contrast does not add, two bacterium that final selection ability to express is high, for the expression of a large amount of albumen.And SDS-PAGE method is conveniently identified expression product.
C. purifying
By the product HIS protein purification post purifying protein of expressing, and dialysis desalting, the protein concentration after measured after purifying is 509mg/L.
I2 antigen protein preparation method 2: screening I2 important antigen epitope polypeptide 2-6, carry out from end (aminoterminal) synthesis from C end (c-terminus) to N with Peptide synthesizer, then with carrier protein couplet, molecular weight is increased, be convenient to be combined on pad and analyzing film.Conventional carrier protein includes but not limited to the poly-D-lysine (PLL) etc. of bovine serum albumin(BSA) (BSA), ovalbumin (OA), keyhole limpet hemocyanin (KLH), human serum albumins (HSA) and Prof. Du Yucang.
Prepared by embodiment 2 antibody
Pad and the anti-human IgA monoclonal antibody of detection zone coated antibody and polyclonal antibody, and for the monoclonal antibody of quality control band and other animal origins of pad and polyclonal antibody, obtain by immune animal.
1, the concrete operation method of monoclonal antibody preparation is:
1) by 0.05mg ~ 5mg immune formulation (respectively for goat, mouse, cavy, rabbit, horse, camel) and the Freund's complete adjuvant of 1 times of volume are mixed to get injection solution, by the multiple location injection in Animal Skin of this injection solution;
2) after one month by the Freund's complete adjuvant mixed liquor of animal through multiple location Animal Skin hemostasis booster immunization.By animal bloodletting after 7 ~ 14 days, measure antiserum titre.
3) to animal booster immunization until titre reaches plateau.By merging from by the animal of immunity recovery splenocyte and murine myeloma cell SP2/0, the hybridoma of energy stably express object antibody after screening, can be obtained.
4) hybridoma of in vitro culture, Mice Inoculated or rat abdominal cavity, get ascites purifying and obtain monoclonal antibody; Or purifying obtains monoclonal antibody from culture supernatant.
2, polyclonal antibody preparation:
With monoclonal antibody step 1) and 2), after acquisition antiserum, purifying antiserum obtains polyclonal antibody.
3, staphylococcal protein A and streptococcal protein G preparation
According to the gene order of staphylococcal protein A and streptococcal protein G, prepare by escherichia coli prokaryotic expression cloned gene, concrete operation method can see (Molecular Cloning: A Laboratory guide), or the step of embodiment 1I2.
Prepared by embodiment 3 collaurum liquid
1) by the HAuCl of 0.01% (w/v)
4solution is heated to boiling, adds rapidly every 100mL HAuCl
4solution adds appropriate reductant solution, and color is from blueness, then light blue, blue, then heating occurs red, boils 7 ~ 10min and occurs transparent orange red.Filter with ultrafiltration or miillpore filter (0.45 μM) again, to remove polymkeric substance wherein and other impurity that may be mixed into.The collaurum outward appearance prepared should pure, bright, without precipitation and floating thing, abandon when grease and a large amount of black particle shape sediment impurity appear in liquid level.
2) wherein used reductive agent can be trisodium citrate, tannic acid-trisodium citrate, white phosphorus, preferably uses trisodium citrate, more preferably uses 1% (w/v) trisodium citrate.
3) wherein absolute cleanliness answered by glass container used, with before need through pickling.Its water should be deionization ultrapure water, and resistivity reaches 18.2M Ω.
4), in colloidal gold solution preparation process, the compound method of each solution is as follows: HAuCl
4preparation: with ultrapure water dissolved chlorine auric acid, be made into 1% solution, put 4 DEG C for subsequent use, the term of validity three months; 1000mL1%HAuCl
4solution formula: 10g HAuCl
4, ultrapure water is settled to 1000mL; The preparation of 1% trisodium citrate (Sodium Citrate): dissolve Sodium Citrate with ultrapure water, be made into 1% solution, 0.22 μM of membrane filtration mistake, now with the current.
Prepared by embodiment 4 gold medal mark albumen
Gold mark albumen of the present invention includes but not limited to mouse-anti people IgA, goat-anti people IgA, rabbit IgM, I2 antigen protein, SPA, Protein G and rabbit IgA.According to the character of concrete albumen, regulate the reaction buffer of different pH, preferably, collaurum pH7.0 ~ 9.0 are regulated with 0.1M sodium carbonate, 5 ~ 25 μ G albumen to be marked is slowly added by every milliliter of colloidal gold solution, mixing, leave standstill 10 ~ 30min, then BSA is added to final concentration 0.5 ~ 1%, mixing, leave standstill 5min, the centrifugal 5min of 3000rpm, go precipitation, upper solution is gone to new pipe, the centrifugal 30min of 9000rpm, remove supernatant, add re-suspension liquid to commercial weight, solution is moved to new pipe, 9000rpm is centrifugal 30min again, add and will precipitate resuspended with the conserving liquid of 1/10th initial volumes, put 4 DEG C for subsequent use.
Prepared by embodiment 5 colloid gold label anti-I2 antibody test test paper 1
The pad of test strips 1 is 1 layer, and in conjunction with gold mark mouse-anti people IgA, detection zone bag is by I2 antigen protein, and quality control band bag is by sheep anti mouse IgA, and test strips length is about 6.5cm, wide 4mm.Pad material is glass fibre membrane, and analyzing film material is nitrocellulose filter (NC).Preparation process is as follows:
1) analyzing film preparation:
Being buffered liquid dilution I2 antigen protein to concentration with bag is 0.8mG/mL, and with drawing film gold spraying instrument HM3035, distance pad 1cm place, is sprayed on NC with 1 μ L/cm, forms detection zone (4).Be buffered liquid with bag and sheep anti mouse IgA is diluted to 0.5mG/mL, distance detection zone is about 5mm place, being sprayed on same NC film, forming quality control band with 1 μ L/cm with drawing film gold spraying instrument instrument, and quality control band simultaneously distance adsorptive pads is about 1cm.Analyzing film 37 DEG C oven dry, encapsulates for subsequent use.
It can be borate, carbonate, phosphate, Tris-HCl or Tris-phosphate etc. that the bag used is buffered liquid, the effect of damping fluid is to provide certain pH and ionic strength makes albumen firmly be coated in NC film, pH of cushioning fluid is generally about in 6 ~ 9.5 scopes, be preferably within the scope of the neutral buffered of 6.5 ~ 7.5, and most preferably the pH value of damping fluid is in 7.0 ~ 7.4 scopes.
The 0.01M phosphate buffer of the present embodiment pH of cushioning fluid 7.2 used.
The optional nitrocellulose filter of material (NC) of analyzing film or cellulose acetate membrane, commercial nitrocellulose filter comprises S & SAE99, whatman8 μm, millipore M135, sartorius CN140 etc.The concrete NC film or the cellulose acetate membrane that use which kind of specification are not keys of the present invention, but in each mensuration, above-mentioned several NC film can as preferably.The film of the different damping fluid process containing different surfaces activating agent that different manufacturers uses, gap is in various degree had with detection line antibody-solutions affinity used, also can largely cause lines uneven, traction or the phenomenon of disperse, therefore use assembling test paper to select preferred NC film or cellulose acetate membrane.
2) pad preparation
Glass fibre membrane is soaked about 30 minutes with pad damping fluid, 37 DEG C of oven dry, by the mouse-anti people IgA of preparation in embodiment 4 gold labeling antibody with drawing film gold spraying instrument instrument, are sprayed on pretreated glass fibre membrane with the consumption of 3 μ L/cm, namely 37 DEG C of oven dry form pad, put 2 ~ 8 DEG C for subsequent use.
Pad buffer formulation: 0.01M PB, 1%BSA, 0.05%NaN3,0.1%TritonX, 10% sucrose.
3) sample pad preparation
Soak sample pad with sample pad treating fluid, then at 37 DEG C, 1h is dried, for subsequent use.
Consisting of of sample pad damping fluid: pH is the 0.01M PB buffer solution of 7.2, containing 1%BSA, and 10% sucrose, 0.1%Tween-20.
4) test paper cutting and assembling
With guillotine, sample pad also dry for above-mentioned steps preparation, pad, analyzing film, thieving paper are sheared the wide fillet of 1.7cm, 0.8cm, 2.5cm and 1.5cm respectively, large plate is overlapped to form by Fig. 1 mode, with cutting cutter, large plate is cut into single part, the difference that every person-portion width gets stuck according to base plate and different, the present embodiment selects 4mm width.Be assembled in the test card got ready by the test paper that single part has cut, make the sample pad of the corresponding test paper of application of sample window, the corresponding detection zone of result display window and quality control region, assembling temperature controls at 25 ~ 37 DEG C, humidity 20 ~ 30%.
Prepared by embodiment 6 colloid gold label anti-I2 antibody test test paper 2
The pad associated proteins of test strips 2 is gold mark goat-anti people's IgA polyclonal antibody and rabbit IgM, and detection zone bag is by I2 antigen protein, and quality control band bag is by mouse-anti rabbit IgM monoclonal antibody, and test strips length is about 6.5cm, wide 3mm.Pad material is polyester film, and analyzing film material is cellulose nitrate.Preparation process is as follows:
1) preparation of analyzing film
With embodiment 5, difference is the concentration of mouse-anti rabbit IgM is 0.3mG/mL, and pH of buffer is 6.9.
2) preparation of pad
Pad selects polyester film, and with drawing gold mark goat-anti people's IgA polyclonal antibody that film gold spraying instrument prepares embodiment 4 and rabbit IgA is coated with in 2 polyester film layer respectively, coating weight is 4 μ L/cm, and pad pH of buffer is 7.0, containing 15%.
3) test paper cutting and assembling
With embodiment 5, difference overlaps large plate by Fig. 2 mode, and shearing width is 3mm.
Prepared by embodiment 7. colloid gold label anti-I2 antibody test test paper 3
The pad associated proteins of test strips 3 is gold mark I2 antigen protein and rabbit IgA, and detection zone bag is by the anti-human IgA polyclonal antibody of rabbit, and quality control band bag is by goat-anti rabbit IgA monoclonal antibody, and test strips length is about 6.5cm, wide 3mm.Pad material is glass fibre membrane, and analyzing film material is cellulose acetate membrane.Preparation process is as follows:
1) preparation of analyzing film
Select cellulose acetate membrane, prepare same embodiment 5, difference is detection zone coating protein mouse-anti people IgA dilute concentration is 1.0mG/mL, and the dilute concentration of quality control band coating protein goat anti-rabbit igg is 0.8mG/mL, and pH of buffer is 7.5.
2) preparation of pad
Select glass fibre membrane, preparation method is with embodiment 5, and it is two-layer that difference is that pad divides, and 2a layer is gold mark I2 antigen protein, and 2b layer be that gold marks rabbit igg, and coating weight is 3.5 μ L/cm, and pH of buffer is 7.3, containing 12% sucrose.
3) test paper cutting and assembling
With embodiment 6.
Prepared by embodiment 8. colloid gold label anti-I2 antibody test test paper 4
The pad associated proteins of test strips 4 is gold mark I2 antigen protein, and detection zone bag is by guinea pig anti-human IgA polyclonal antibody, and quality control band bag is by mouse-anti I2 monoclonal antibody IgM, and test strips length is about 6.5cm, wide 4mm.Pad material is glass fibre membrane, and analyzing film material is nitrocellulose filter (NC).Preparation process is as follows:
1) analyzing film preparation:
With embodiment 5, difference is the concentration of detection zone coating protein guinea pig anti-human IgA monoclonal antibody is 1.2mG/mL, and quantity for spray is 0.8 μ L/cm, and pH of buffer is 7.0.It is 0.6mG/mL that quality control band prepares coating protein mouse-anti I2 monoclonal antibody IgM dilute concentration, and quantity for spray is 1 μ L/cm.PH of buffer is 7.2.
2) pad preparation
With embodiment 5, difference is the spraying consumption of gold mark I2 antigen protein is 5 μ L/cm, and pad damping fluid sucrose concentration is 12%, and pH of buffer is 7.2.
3) sample pad preparation
With embodiment 5, difference sample pad does not do pre-service.
4) test paper cutting and assembling
With embodiment 5.
The colored latex labelled protein preparation of embodiment 9.
1) preparation of colored latex marking fluid
Latex covalent activated: ultrasound wave process latex microsphere body 30 seconds, regulates latex microsphere bulk concentration to be 1.0 × 10
12centrifugal 10 minutes of/mL, 15000rpm, collected after centrifugation sediment distilled water dissolves, and disperses 30 seconds with 200W ultrasound wave; First add the 50mg/mL EDC of 50 μ L, vibration mixing, then add the 50mg/mL N-hydroxy thiosuccinimide of 50 μ L, vibration mixing, equilibrate at room temperature after 30 minutes at 15000rpm centrifugal 10 minutes, precipitation 50mM citrate buffer solution dissolves, and is statically placed in 4 DEG C of refrigerators.
2) preparation of colored latex labelled protein
By the latex after activation in 200W ultrasound wave process 30 seconds, I2 antigen protein to be marked, guinea pig anti-human IgA, rabbit IgM, the anti-human IgA of horse, horse IgG or camel IgG is added according to the ratio of the colored latex of 100 ~ 150 μ G-protein/100 μ L, mixing stirring at room temperature reacts 2 hours, centrifuge washing, under each 15000rpm centrifugal 10 minutes, wash 3 times altogether, precipitate and to dissolve with PBS-TBN and 100W ultrasound wave process 30 seconds, then be diluted to centrifugal front volume with PBS-TBN, 4 DEG C save backup.
The colored latex of embodiment 10. marks anti-I2 antibody test test paper 5 to be prepared
The pad associated proteins of test strips 5 is red latex mark guinea pig anti-human IgA, and detection zone bag is by I2 antigen protein, and quality control band bag is by the IgG monoclonal antibody of goat-anti cavy IgA and SPA.Test strips length is about 6.5cm, wide 4mm.Pad material is polyester film, and analyzing film material is nitrocellulose filter (NC).Preparation process is as follows:
1) preparation of analyzing film
With embodiment 5, difference is that the coating protein SPA of quality control band and sheep anti mouse IgA are diluted to 0.8mg/mL respectively, 1: 1 mixing, and with 1 μ L/cm with drawing the spraying of film gold spraying instrument, pH of buffer is 7.7.
2) preparation of pad
Select polymer PET, do not do pre-service, directly an I2 antigen protein stroke film gold spraying instrument for red latex mark in embodiment 9, be sprayed on pretreated polymer PET with the consumption of 3 μ L/cm, pad pH of buffer is 7.5.
3) sample pad preparation
With embodiment 5.
4) test paper cutting and assembling
With embodiment 5.
The colored latex of embodiment 11 marks anti-I2 antibody test test paper 6 to be prepared
The pad of test strips 62 layers, 2a associated proteins is the I2 antigen protein of purple latex mark, and 2b layer is the rabbit IgM of blue coloring agent breast mark, and detection zone bag is by the anti-human IgA monoclonal antibody of rabbit, and quality control band bag is by mouse-anti rabbit IgM, and test strips length is about 6.5cm, wide 4mm.Pad material is glass fibre membrane, and analyzing film material is nitrocellulose filter.Preparation process is as follows:
1) analyzing film preparation:
With embodiment 5, difference is that the dilute concentration of the anti-human IgA monoclonal antibody of coating protein rabbit of detection zone is about 1.0mG/mL, and pH of buffer is 7.4.The coating protein mouse-anti rabbit IgA dilute concentration of quality control band is 0.9mG/mL, and pH of buffer is 7.4.
2) pad preparation
With embodiment 5, difference is pad is 2 layers, and 2a layer is the I2 antigen protein of purple latex mark, and 2b layer is the rabbit IgM of blue latex mark, and quantity for spray is respectively 3.5 μ L/cm and 3.0 μ L/cm.
3) sample pad preparation
With embodiment 5.
4) test paper cutting and assembling
With embodiment 6.
The colored latex of embodiment 12 marks anti-I2 antibody test test paper 7 to be prepared
The pad of test strips 7 is 2 layers, and 2a layer is the I2 antigen protein of purple latex mark, and 2b layer is the sheep anti mouse IgA of blue coloring agent breast mark, and detection zone bag is by the anti-human IgA monoclonal antibody of camel, and quality control band bag is by Protein G, and test strips length is about 6.5cm, wide 4mm.Pad material is polyester film, and analyzing film material is vinegar nitrocellulose filter.Preparation process is as follows:
1) analyzing film preparation:
Prepared by detection zone: be buffered liquid with bag and dilute the anti-human IgA monoclonal antibody of camel respectively and be about 1.0mG/mL to concentration, and with drawing a film gold spraying instrument HM3035, distance pad 1cm place, is sprayed on NC with 1 μ L/cm, formation detection zone (4).
Prepared by quality control band: be buffered liquid with bag and respectively Protein G be diluted to about 1.5mG/mL, distance detection zone is about 5mm place, being sprayed on same NC film with 1 μ L/cm with drawing film gold spraying instrument, forming quality control band (5), quality control band is distance adsorptive pads (6) about 1cm simultaneously.
Analyzing film 37 DEG C oven dry, encapsulates for subsequent use.
2) pad preparation
Polyester film is soaked about 30 minutes with pad damping fluid, 37 DEG C of oven dry, the mouse IgG of the I2 antigen protein of the purple latex of preparation in embodiment 9 mark and blue latex mark is mixed by 1: 1, be sprayed on pretreated glass fibre membrane with drawing film gold spraying instrument with the consumption of 5 μ L/cm, namely 37 DEG C of oven dry form pad, put 2 ~ 8 DEG C for subsequent use.
3) sample pad preparation
Soak sample pad with sample pad treating fluid, then at 37 DEG C, 1h is dried, for subsequent use.
4) test paper cutting and assembling
With embodiment 6.
The colored latex of embodiment 13 marks anti-I2 antibody test test paper 8 to be prepared
The pad of test strips 81 layer, be the anti-human IgA of horse of purple latex mark and the horse IgG of blue latex mark, detection zone bag is by I2 antigen protein, and quality control band bag is by mouse-anti horse IgG, and test strips length is about 6.5cm, wide 3mm.Pad material is polyester film, and analyzing film material is vinegar nitrocellulose filter.Preparation process is as follows:
1) analyzing film preparation:
With embodiment 5, difference is detection zone coating protein is I2 antigen protein, and dilute concentration is 0.9mG/mL, and quantity for spray is 1.2 μ L/cm.Quality control band coating protein is mouse-anti horse IgG, dilute concentration 0.3mG/mL, and quantity for spray is 1 μ L/cm.Bag is buffered liquid pH value 7.3.
2) pad preparation
Same embodiment, difference selects polyester film, do not make immersion treatment.Pad associated proteins is the I2 antigen protein of purple latex mark and the mouse IgG of blue latex mark, and be diluted to 1.6mG/mL and 1.0mG/mL respectively, by 1: 1 mixing, quantity for spray is 5 μ L/cm.
3) sample pad preparation
With embodiment 5.
4) test paper cutting and assembling
With embodiment 5.
Embodiment 14 sample process
Serum sample: get whole blood 1 ~ 5mL in serum collection pipe, leaves standstill the centrifugal 5 ~ 10min of 30min ~ 2h, 3000 ~ 5000g, gets supernatant and get final product.According to the accuracy of detection of test strips, sample sample loading buffer dilution 0 ~ 100 times, get 50 ~ 100 μ L and be added drop-wise in the well of test strips, leave standstill observations after 5 ~ 20 minutes.
Plasma sample: get whole blood 1 ~ 5mL and mix in sodium citrate or liquaemin anticoagulant tube, the centrifugal 5 ~ 10min of 1000 ~ 3000g, gets supernatant and namely obtain plasma sample.According to the accuracy of detection of test strips, sample sample loading buffer dilution 0-100 times, get 50 ~ 100 μ L and be added drop-wise in the well of test strips, leave standstill observations after 5 ~ 20 minutes.
Whole blood sample: fetching point or ear-lobe fresh blood about 50 μ L, be added drop-wise in well, is added drop-wise in well with 50 μ L sample loading buffers at once and dilutes, leave standstill observations after 5 ~ 20 minutes.
Embodiment 15 test strips Performance Evaluation
The performance of reagent strip of the present invention comprise stability, batch in inaccuracy and batch between inaccuracy assessment.
1,37 DEG C of stability tests
Test strips is placed 37 DEG C, the withinrun precision of the yin and yang attribute coincidence rate of each 10 parts of taking-up every day quality-control product harmonizing yinyang reference material judges the stability of test paper.After 4 months, the yin and yang attribute coincidence rate of quality-control product and each yin and yang attribute reference material is 100%.Infer that the shelf-life of test strips is more than 18 months.
2, interior inaccuracy is criticized
The gold label test strip that Example 5 ~ 8 is each one batch, with the latex test strips of each one batch of embodiment 10 ~ 12, respectively with high, medium and low three kinds of positive serums and each portion of negative serum, every part of serum uses gold label test strip and latex test strips duplicate detection 10 times respectively, shown in result following table, the testing result of all positive serums is the positive, and the testing result of all negative serums is feminine gender, points out colloidal gold strip of the present invention and latex test strips to criticize interior inaccuracy and meets standard.
3, criticize between inaccuracy
Test strips 1 and each three batches of test strips 6, detect with high, medium and low three kinds of positive serums and negative serum, every part of Virus monitory 10, observations after 10 minutes, as shown in the table, test strips 1 is consistent with the testing result of each three different batches of test strips 6, illustrates that between criticizing, inaccuracy meets sample.
Embodiment 15 ELISA test strip and clinical performance assessment
The gold label test strip prepared by embodiment 5 ~ 8 and embodiment 10 ~ 12 prepare the CD patient and normal human serum or each 100 examples of blood plasma that latex ELISA test strip makes a definite diagnosis.Detection sensitivity is in all positive clinical case loads, number percent shared by ELISA test strip number positive, detection specificity is the number percent in all clinical negative case numbers shared by the negative number of ELISA test strip, and detection accuracy is the number percent that the negative number sum in the number positive and clinical negative case detected in positive clinical case accounts for sum.
As shown in the table, gold mark prepared by the present invention and latex test strips are 7 ~ 15% for the detection sensitivity of CD patient, and specificity is 94 ~ 99%, meet clinical diagnosis expection.
Claims (9)
1. an anti-I2 antibody immune chromatography test strips, comprise sample pad (1), pad (2), analyzing film (3), adsorptive pads (6), base plate (7), detection zone T line (4) and quality control band C line (5), the top of described base plate (7) is fitted with analyzing film (3), the two ends on described analyzing film (3) top are fitted with pad (2) and adsorptive pads (6) respectively, the one end on described pad (2) top is fitted with sample pad (1), described detection zone T line (4) and quality control band C line (5) are arranged on analyzing film (3), it is characterized in that, I2 antigen protein is combined on pad (2) or is coated on detection zone T line (4).
2. I2 antibody test test strips according to claim 1, is characterized in that, described pad be 1 layer (Fig. 1) or upper (2a), under (2b) two-layer with analyzing film overlap joint straggly (Fig. 2).
3. a preparation method for anti-I2 antibody immune chromatography test strips, comprises the steps:
The preparation of step 1.I2 antigen protein
Prepared by step 2. pad (2)
(1) preparation of colloid gold label thing: with nano-Au solution mark I2 antigen protein, anti-human IgA antibody, staphylococcal protein A (SPA), streptococcal protein G (Protein G), and other detection zone T lines or the albumen of immune complex can be formed with quality control band C line.
(2) preparation of latex label: with the latex microsphere mark I2 antigen protein of band reactive group, anti-human IgA antibody, staphylococcal protein A (SPA), streptococcal protein G (Protein G), and other detection zone T lines or the albumen of immune complex can be formed with quality control band C line.
(3) pad (2) preparation: glass fibre membrane or polymer PET are as pad, and the colloid gold label thing prepare step (1) or latex label, be sprayed on glass fibre membrane or polymer PET, drying for standby.
Prepared by step 3. analyzing film (3)
A. detection zone T line (4) preparation: according to pad labelled protein type selecting detection zone T line coating protein, the coating protein containing I2, detection zone T line as the associated proteins on pad is anti-human IgA antibody.If containing anti-human IgA antibody on pad, detection zone T line coating protein is I2 antigen protein.
B. quality control band C line (5) preparation: according to the coating protein of the labelled protein type selecting quality control band of pad, if pad labelled protein is single I2, the coating protein of quality control band C line is the antibody of anti-I2; If pad labelled protein is single anti-human IgA antibody, the labelled protein of quality control band C line is the antibody of corresponding anti-human IgA antibody; When pad labelled protein has 2 layers, the coating protein of quality control band C line can form the albumen of immune complex with pad respective layer associated proteins.
Prepared by step 4. sample pad
Glass fibre membrane or polyester film are flooded dry for standby through damping fluid, or directly uses.
Step 5. test strips is assembled
The material completed made by step 1 ~ 4, be overlapped to form large plate by Fig. 1 or Fig. 2, cut into certain length and width according to the specification of base plate, in being arranged on base plate and getting stuck.
4. immuno-chromatographic test paper strip according to claim 4, is characterized in that: described I2 antigen protein is total length I2 gene or the gene order containing important epitope, and be cloned in protokaryon or carrier for expression of eukaryon, expression and purification obtains.
5. immuno-chromatographic test paper strip according to claim 4, is characterized in that: described I2 antigen protein is with Peptide synthesizer synthesis containing the I2 polypeptide of the important epitope of I2, and is coupled on carrier protein and obtains.
6. immuno-chromatographic test paper strip according to claim 5, is characterized in that: described carrier protein includes but not limited to the poly-D-lysine (PLL) etc. of bovine serum albumin(BSA) (BSA), ovalbumin (OA), keyhole limpet hemocyanin (KLH), human serum albumins (HSA) and Prof. Du Yucang.
7. immuno-chromatographic test paper strip according to claim 4, it is characterized in that: described anti-human IgA antibody is one or more polyclonal antibodies in mouse source, rabbit source, Yang Yuan, Ma Yuan, camel source or cavy source, or mouse source, rabbit source, one or more monoclonal antibodies in camel source.
8. immuno-chromatographic test paper strip according to claim 4, is characterized in that, the antibody of described anti-human IgA antibody refers to and can form the albumen of immune complex with this antibody.
9. an anti-I2 antibody detection method, is characterized in that, with the immuno-chromatographic test paper strip described in claim 1-8, detect measuring samples, concrete steps comprise:
(1) sample process: get serum, blood plasma or whole blood sample, with sample loading buffer dilution 0 ~ 100 times;
(2) sample drop of above-mentioned process is added in the sample pad of test strips, leaves standstill 5 ~ 30 minutes, observe T line and C line;
(3) result interpretation: T line and C line all manifest, result is positive; T line does not manifest, and C line manifests, and result is negative; T line and C line all do not manifest or other phenomenons, and prompting test paper lost efficacy.
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