CN101762694A - Magnetic immunochromatographic strip for detection of HCV antibody and preparation method thereof - Google Patents
Magnetic immunochromatographic strip for detection of HCV antibody and preparation method thereof Download PDFInfo
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- CN101762694A CN101762694A CN200910087646A CN200910087646A CN101762694A CN 101762694 A CN101762694 A CN 101762694A CN 200910087646 A CN200910087646 A CN 200910087646A CN 200910087646 A CN200910087646 A CN 200910087646A CN 101762694 A CN101762694 A CN 101762694A
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Abstract
The invention relates to a magnetic immunochromatographic strip for detection of an HCV antibody and a preparation method thereof. The strip is prepared through the following steps: pasting a coating film pre-coated with HCV antigen detection lines and quality control lines, a magnetic particle pad coupled with HCV antigens, a sample pad and an absorbent pad on a bottom board in sequence at intervals, using a transparent plastic seal film to cover the upper layer, and then assembling the structure into a plastic card. The invention creatively introduces the magnetic immunochromatographic technique and the biotin-avidin system into the detection of the HCV antibody, thereby greatly improving the sensitivity and accuracy of the detection of the HCV antibody, shortening the detection window period and providing good practicability.
Description
Technical field
The invention belongs to field of medical examination, particularly relate to magnetic immuno-chromatographic test paper strip of a kind of HCV of detection antibody and preparation method thereof.
Background technology
HCV belongs to flaviviridae (flaviviridae), and its genome is the sub-thread positive chain RNA, and easily variation can be divided into 6 genotype and different subtype at present, and gene 1 type is global distribution, accounts for more than 70% of all HCV infection.The HCV genome contains an open reading frame (ORF), encode kind of structure and non-structure (NS) albumen surplus in the of 10, and NS3 albumen is a kind of multifunctional protein, and aminoterminal has proteinase activity, and c-terminus has helicase/nucleoside triphosphate enzymatic activity; NS5B albumen is the RNA polymerase that RNA relies on, and being HCV, to duplicate institute essential, is the important target position of antiviral therapy.It is global popular that hepatitis C is, and is the main reason of America and Europe and Japan and other countries hepatopathy in whole latter stage.According to World Health Organization's statistics, the infection rate of global HCV is about 3%, estimates that about 1.7 hundred million people have infected HCV, about 3.5 ten thousand examples of annual New Development hepatitis C case.
After the HCV infection, viremia virusemia continue 6 months not yet removing person be chronic infection, hepatitis C chronicity rate is 50%～85%.Infected back 20 years, children and young woman's cirrhosis incidence are 2%～94%; Middle age is 20%～30% because of blood transfusion the infected; General crowd is 10%～15%.Below 40 years old after crowd and the women's HCV infection spontaneous removing virus rate higher; During HCV infection the age more than 40 years old, the male sex and concurrent infection HCV and the person that causes the immunologic hypofunction can promote the progress of disease.Merge that hepatitis type B virus (HBV) infects, is addicted to drink (more than the 50g/d), NASH (NASH), liver high ferro carrying capacity, the noxious material etc. that merges infection by Schistosoma, hepatotoxicity wind agitation medicine and environment pollution induced also can promote progression of disease.
The HCC incidence that HCV is relevant is 1%～3% after infecting 30 years, is mainly seen in cirrhosis and progressivity patients with liver fibrosis, in case develop into cirrhosis, the year incidence of HCC is 1%～7%.The factor of above-mentioned promotion hepatitis C progress and diabetes etc. all can promote the generation of HCC.The HCC incidence of blood transfusion back hepatitis C patients is higher relatively.The quality of life that cirrhosis and HCC patient are taken place all descends to some extent.
Cirrhosis and HCC are chronic hepatitis C patient's underlying cause of deaths, and wherein decompensated liver cirrhosis is main.Report is arranged, in case cirrhosis takes place, 10 annual survival rates are about 80%, and compensatory as mistake occurring, the survival rate in 10 years only is 25%.Interferon (IFN α) treatment back is respondent's's (comprise and reply the back recidivist fully) HCC fully; Incidence is lower, but nonresponder's HCC incidence is higher.
Present HCV etiological diagnosis technology mainly comprises special viral antibody enzyme linked immune assay (ELISA), chemiluminescence (CLIA), immunochromatographic method (collaurum or latex particle method), recombinant immune blotting (RIBA), HCV RNA is qualitative and detection by quantitative etc., and these methods all have characteristics separately and use object.
The ELISA method is generally to use detection technique in the present clinical blood examination, the maximum of present clinical usefulness are third generation reagent, the overwhelming majority adopts indirect method to detect HCV antibody, though now external minority producer developed into the 4th generation reagent: detect antibody to hepatitis C and antigen simultaneously, but owing to high costsly also fail to realize large-scale promotion application, indirect method HCV antibody ELISA test operation program complexity, false positive or false negative result appear easily, and sensitivity is low, CLIA and ELISA method are similar, just sensitivity has improved some, the problem that the not basic ELISA of solution exists, and all there is complex operation in the two, the problem that reaction time is long, and all need microplate reader or light-emitting appearance and wash complex apparatus such as plate machine and incubator, and can not single part detect, further limited them at some basic hospitals, the application of clinic.Having occurred both at home and abroad in recent years with collaurum or latex particle is the quick detection test paper bar of representative, but because the result is the naked eyes visualizations, is subjected to the influence of observer's subjective judgement easily, and sensitivity is low, and result precision is not high yet, and the detection window phase is longer.
Recombinant immune blotting (RIBA) is the confirmation method that at present clinical third liver detects, the result accurately and reliably, but its technical difficulty is big, the whole world also has only several company to produce at present, high use cost makes it only be used for the affirmation of suspicious sample at present, and seldom is used for screening.
Qualitative and the detection by quantitative of HCV RNA etc., all need very high experiment work environment and condition (between sterile working, superclean bench) and expensive instrument and equipment (hydro-extractor, PCR instrument etc.), and operation is extremely complicated, need be subjected to the personnel operation of strict professional training, and the test period is very long, is not suitable for clinical examination and detects usefulness.
Magnetic immuno-chromatographic (Mgnetic ImmunoChromatographic Test, MICT) be occur in recent years the single part fast quantification detection technique of a kind of a new generation.Be to replace traditional label (collaurum, latex particle etc.) to carry out immunochromatography, be combined in biochemical substances on the super-paramagnetism nano particulate by detection detection by quantitative data to biological sample are provided with supperparamagnetic particles (superPMPs).Come the amount of presentation markup by detecting the measurement magnetic field intensity, adopt the typical curve of the immune complex-magnetic field intensity of mark, thereby reach quantitative purpose in sample area.This technology is compared with conventional art has following advantages: 1) sensitivity for analysis: than the sensitive 10-100 of all kinds of range estimation quick diagnosis methods doubly; 2) analysis speed: can in 15 seconds, measure the nearly data of 6 site of analysis; 3) linear range: at 1-10
4Concentration range in be linear; 4) the used magnetic detecting instrument adopts the solid phase element, and miniaturized design is had a style of one's own, independent operating, and volume is little, and is easy and simple to handle; 5) the super-paramagnetism nano particulate can not decayed in time by polymer coating; Independently quick diagnosis chromatogram card (MAR Cassette) can directly insert the MAR detector, for the integration of many quick reagents for clinical diagnosis at present provides development space widely; But also personnel or the contingent cross pollution of instrument in the operating process, the security that has improved analysis and process have been avoided.This technology has been inherited traditional immunochromatographic method (collaurum, latex particle etc.) easy to be quick, the advantage of single part of operation, it is low to have remedied traditional immunochromatography technique sensitivity again, can only be qualitative, shortcoming that can not be quantitative, represented current real-time test (Point of Care Test, POCT) direction of technical development and trend are once appearance, development has become the first-selection that substitutes traditional immunochromatography technique at present rapidly.
Mark magnetic particle commonly used at present is a super paramagnetic particle (superPMPs), do not have any magnetic in the absence of externally-applied magnetic field, only just can show magnetic adding under the action of a magnetic field, the super paramagnetic particle of commercialization all passes through finishing, greatly facilitate labeling process, mark is easy, good reproducibility.
Biotin-avidin system (BAS) is a kind of technology of widespread use, with the Avidin bag by solid phase, with biotin labeling antigen or antibody, utilize affinity high between the biotin Avidin and Avidin characteristic, can improve the sensitivity of reaction greatly, through the development of decades in conjunction with four biotins, a large amount of derivants have all appearred in Avidin and biotin at present, can select for use according to different needs, labeling method is also very easy, has increased their ease for use greatly.Biotin Avidin system is introduced in the magnetic immuno-chromatographic; in the sensitivity that has greatly improved detection method, a kind of fabulous current techique platform is provided again, in large-scale production, reduced markers step; reduce variable factor, increased the versatility of technology.
In recent years, because the progress of molecule clone technology, adopt multiple different expressive host to make the recombinant expressed extensive expansion of HCV antigen, it is good a collection of sensitivity to have occurred, the specificity height, activity keeps HCV antigen preferably in bag quilt and the labeling process, make the reaction pattern that adopts double antigens sandwich detect HCV antibody and become possibility, double antigens sandwich has highly sensitive than the detecting pattern of indirect method, specificity is good, operates easyly relatively, and the result is advantage accurately and reliably, be widely adopted human immunodeficiency virus (HIV) and microspironema pallidum (TP), just at the early-stage on the HCV detection of antibodies.
Summary of the invention
Purpose of the present invention promptly is with in magnetic immuno-chromatographic technology and the system combined HCV of the being applied in immunoassay of biotin Avidin.With the streptavidin covalent coupling on super paramagnetic particle, biotinylation HCV antigen is mixed with it afterwards as detecting moving phase, with the antigen coated detection line of on nitrocellulose filter, making of HCV as catching solid phase, adopt the reaction pattern of double antigens sandwich, carry out the detection of sample according to routine immunization chromatography ratio juris, detect in conjunction with simple and easy to do magnetism detector, thereby realize the high sensitivity fast detecting, can avoid the deficiency of aforementioned several detection methods, combine the advantage of aforementioned several method again: can single part detect, also can batch detection, and can provide quantitative result immediately, surveying instrument is simple and reliable, and is easy and simple to handle, convenient and practical.
For reaching above-mentioned purpose, technical scheme of the present invention is as follows: the magnetic immuno-chromatographic test paper strip of detection HCV antibody of the present invention is with coated film, the magnetic mat of particles that combines HCV antigen, sample pad, adsorptive pads, sticks on the base plate successively interlaced 2mm, cover the transparent plastic diaphragm seal then on the upper strata and make, be coated with the nature controlling line of HCV detection of antigens line and biotinylation bovine serum albumin(BSA) on the wherein said coated film in advance.Adopt the reaction pattern of double antigens sandwich to detect HCV antibody.
The base plate of selecting for use is the transparent plastic base plate, and coated film is the nitrocellulose filter of 35mm width, and the adsorptive pads of selecting for use is a cellulose membrane, and the magnetic mat of particles is a fiberglass packing, and sample pad is the pretreated cellulose membrane of process sample pad treating fluid.Described sample pad treating fluid is the polyvinyl alcohol (PVA) (PVP) that contains 0.1%-1%, and the 0.02M of 0.01-0.2% Tween-20 (Tween-20), the phosphate buffered solution of pH7.0-7.6 (PBS).
Detect the preparation method of the magnetic immuno-chromatographic test paper strip of HCV antibody, may further comprise the steps:
The processing of A, antigen: select for use commercialization HCV recombinant antigen (the HCV fusion antigenNS3-4-5-core of CTK company, cat:A7289); To 20mM, 4 ℃ of dialysed overnight of the PBS of pH7.0-7.6;
The preparation of B, magnetic particle: selecting diameter for use is the super paramagnetic particle of 100-300nm, the mode of using carbodiimide (EDC) and succinimide (NHS) covalent coupling with the streptavidin mark to the magnetic particle, select for use pre-activation biotin to carry out the mark of HCV antigen, the biotinylated antigen that mark is good is with 1: 2-1: 10 ratio (volume ratio) is mixed with streptavidin magnetic particle, guarantees that streptavidin magnetic particle is excessive;
C, use quantitative liquid-jet device to be sprayed on the magnetic mat of particles magnetic particle for preparing with the amount of 5 μ l/cm-30 μ l/cm;
The preparation of D, coated film: use bag to be cushioned the concentration that liquid is diluted to HCV envelope antigen and biotinylation BSA 0.5-1.0mg/m respectively, use quantitative liquid-jet device respectively with the two with the interval spray printing of 0.5-1.0cm on nitrocellulose filter, dry the back and in confining liquid, soak after 10 minutes, add drying agent and seal up for safekeeping standby in 25-35 ℃ of oven dry 8 hours;
The processing of E, sample pad: sample pad is put into sample pad Treatment Solution immersion treatment take out 25-35 ℃ of oven dry 8 hours after 1 hour;
The assembling of F, test card: interlaced successively 2mm sticks coated film, magnetic mat of particles, sample pad, adsorptive pads on the transparent plastic base plate, cover the transparent plastic diaphragm seal then on the upper strata, obtain test paper plate, width cutting promptly obtains test strips as requested, and test strips is packed into to compress in the plastic clip promptly obtains test card.
Described step B comprises following three steps:
1) preparation of streptavidin magnetic particle: use the 50mM that contains 0.1%Tween-20, the sodium-acetate buffer washing magnetic particle of pH4.5-5.0, adding EDC and NHS makes the two final concentration be 20mmol, room temperature reaction 1 hour, use contains the 50mM of 0.1%Tween-20, the sodium-acetate buffer of pH4.5-5.0 fully washs and adds streptavidin behind the magnetic particle to make the molecule ratio of streptavidin and magnetic particle be 5: 1 (mol ratio), room temperature reaction 3 hours, add the 0.02M that contains 0.5%BSA, the PBS room temperature sealing of pH7.0-7.6 30 minutes, washing magnetic particle, use contains 1%PVP, 0.5%Tween-20, the boric acid of the 50mM pH8.2-9.0 of 5% sucrose preserve damping fluid redissolution magnetic particle, and 4 ℃ of preservations are standby;
2) preparation of biotinylation HCV antigen: with HCV antigen to 0.02M, 4 ℃ of dialysed overnight of the PBS of pH7.0-7.6, adjustment concentration is 2mg/ml, to activate biotin in advance and use dimethyl sulfoxide (DMSO) (DMSO) dissolving, final concentration is 50mM, adds the biotin solution of aequum, room temperature reaction 1 hour with 20: 1 molecule ratios in antigen or antibody-solutions, to 4 ℃ of dialysed overnight of 0.02M PBS ,-20 ℃ of preservations are standby behind the adding equal-volume glycerine;
3) biotinylated antigen and streptavidin magnetic particle mixes, amount with 0.5 μ l/mg magnetic particle adds biotinylation HCV antigen in streptavidin magnetic particle solution, fully use behind the mixing and preserve damping fluid with 1: 5-1: 20 ratio (volume ratio) is used mixture diluted fiberglass packing to be sprayed.
Among the described step C, the spraying method of magnetic particle is: use quantitative spray film device evenly to be sprayed on the glass fibre with the amount of 30 μ l/cm the magnetic particle for preparing, add drying agent after the freeze drying and seal up for safekeeping standby.
Among the described step D, the preparation method of coated film is: be cushioned liquid (0.02M PB with bag, pH7.0-7.6) be 0.5mg/ml with the HCV antigen diluent, biotinylation BSA dilution is 1mg/ml, use quantitative spray film device with the amount of 1 μ l/cm with the two with the interval spray printing of 0.6cm on nitrocellulose filter, room temperature is dried after 30 minutes and to be soaked in confining liquid after 10 minutes in 25-35 ℃ of oven dry 8 hours, adds drying agent and seals up for safekeeping standby.
Compare with existing quick detection test paper bar, the present invention has the following advantages:
1) selects high-affinity recombinant HCV antigen for use, take the pattern of double antigens sandwich to detect, have higher sensitivity and specificity, make testing result more reliable compared to two traditional anti-indirect methods.
1) by on the magnetic particle, introducing biotin-avidin system, make the preparation process of test strips simplify greatly, be fit to large-scale production.
2) the utilization magnetism detector carries out result's interpretation, carries out yin and yang attribute according to the magnetic detection value ratio of detection line and nature controlling line and judges, has reduced the subjectivity of traditional collaurum naked-eye observation, and the result accurately, reliably.
The present invention is easy and simple to handle, be fit to large-scale production, detect required portable set and also go on the market, therefore can be widely used in short run or single part of unit use of using such as applying unit and some blood sampling scenes, rural area and basic unit clinic in enormous quantities such as hospital, blood station, epidemic prevention station, health check-up.Primary dcreening operation etiologic diagnosis for HCV has positive meaning.
Description of drawings
Fig. 1 detects the magnetic immuno-chromatographic test paper strip structural representation of HCV antibody for the present invention.
Detect magnetic immuno-chromatographic test paper strip of HCV antibody and preparation method thereof for further specifying the present invention, describe especially exemplified by following embodiment, this embodiment is in order to explain rather than limit by any way the present invention.
Embodiment
The magnetic immuno-chromatographic test paper strip of HCV antibody in the detection blood of the present invention, as shown in Figure 1, this test strips is at base plate 1) on interlaced successively 2mm ground paste to go up coated film 2), combine the magnetic mat of particles 3 of HCV antigen), sample pad 4), adsorptive pads 5), and cover transparent plastic diaphragm seal 6 on the upper strata) test strips that assembles, coated film 2) on be coated with HCV Detection of antigen line T and and nature controlling line C in advance.
In specific embodiment, the HCV antigen that adopts to for commercialization antigen.Utilize the principle of double antigens sandwich to carry out HCV detection of antibodies in the sample, when containing HCV antibody in the sample to be measured, the antigen combination of combination on antibody meeting elder generation and the magnetic particle, carrying out along with the chromatography effect, bond moves forward and arrives the antigen coated line T of HCV place, and antibody can accumulate in the T place with envelope antigen in conjunction with forming the double antigens sandwich compound once more.In addition, excessive can not continue to move ahead when arriving nature controlling line C, thereby biotinylation BSA can combine at C line place with streptavidin mark magnetic particle and occurs the magnetic particle aggregation equally in conjunction with the streptavidin mark magnetic particle of biotinylated antigen.Entire reaction can be carried out in 30 minutes fully, general reaction can be used magnetic immuno-chromatographic instrument Card Reader after 15 minutes, T line and C line all can produce corresponding magnetic signal value, calculate the ratio of T/C, get final product the yin and yang attribute of result of determination according to default boundary ratio.Whole Card Reader, calculating, with the process sequencing fully of preset bounds value comparison, magnetism detector can directly provide the yin and yang attribute result.
The preparation method of the magnetic immuno-chromatographic test paper strip of HCV antibody sees following example in the detection blood of the present invention:
Embodiment 1
Detect the magnetic immuno-chromatographic test paper strip of HCV antibody in the blood and the preparation method of paper box
The test strips of present embodiment and the preparation method of paper box may further comprise the steps:
The preparation of A, antigen and antibody: select commercial HCV recombinant antigen for use, to 20mM, the PBS of pH7.2 (pH7.0-7.6 all is suitable for), 4 ℃ of dialysed overnight are standby.
The preparation of B, coated film:
Bag is cushioned the preparation of liquid: the phosphate buffer of 0.02M pH 7.2 (PBS) is cushioned liquid for bag, and the rearmounted 4 ℃ of preservations of 0.22 μ m filtering with microporous membrane degerming are standby, two weeks of the term of validity.
The preparation of confining liquid: contain the phosphate buffer (PBS) of the 0.02M pH7.2 (pH7.0-7.6 all is suitable for) of 0.5%BSA, it is standby that 0.22 μ m filtering with microporous membrane degerming is placed on 4 ℃ of preservations, one week of the term of validity.
The preparation of coated film: being cushioned liquid (PB of 0.02M pH7.2 (pH7.0-7.6 all is suitable for)) with bag is 0.5mg/ml with the HCV antigen diluent, biotinylation BSA dilution is 1mg/ml, use quantitative spray film device with the amount of 1 μ l/cm with the two with the even spray printing in the interval of 0.6cm on 3.5cm width nitrocellulose filter, room temperature is dried after 30 minutes in the confining liquid (PBS that contains the 0.02M pH7.2 (pH7.0-7.6 all is suitable for) of 0.5%BSA,) in 25-35 ℃ of oven dry 8 hours, the adding drying agent was sealed up for safekeeping standby after 10 minutes in middle immersion.
The preparation of C, magnetic particle:
The preparation of sodium-acetate buffer: with distilled water and sodium acetate and glacial acetic acid secure ph is 4.7 (pH4.5-5.0 all is suitable for), concentration is the acetate buffer solution of 50mM, adding Tween-20 is that 4 ℃ of preservations are standby after 0.1%, the 0.22 μ m filtering with microporous membrane degerming to final concentration, two weeks of the term of validity.
Boric acid is preserved the preparation of damping fluid: use distilled water, boric acid and borax preparation pH are 8.5 (pH8.2-9.0 all is suitable for), and final concentration is the borate buffer of 50mM, add PVP, Casine, Tween-20, sucrose, final concentration is respectively 1%, 1%, 0.5%, 5%, 0.22 4 ℃ of preservations are standby after the degerming of μ m filtering with microporous membrane, one week of the term of validity.
The preparation of streptavidin magnetic particle: use 50mM pH4.7 (pH4.5-5.0 all is suitable for) the sodium-acetate buffer washing magnetic particle that contains 0.1%Tween-20, adding EDC and NHS makes the two final concentration be 20mmol, room temperature reaction 1 hour, fully adding streptavidin behind the washing magnetic particle, to make the molecule ratio of streptavidin and magnetic particle be 5: 1 (mol ratio), room temperature reaction 3 hours, the PBS that adds the 0.02M pH7.2 (pH7.0-7.6 all is suitable for) that contains 0.5%BSA, room temperature sealing 30 minutes, washing magnetic particle, use contains 1%PVP, 0.5%Tween-20, the boric acid of the 50mmolpH8.5 of 5% sucrose (pH8.2-9.0 all is suitable for) is preserved damping fluid redissolution magnetic particle, and 4 ℃ of preservations are standby.
The preparation of biotinylation HCV antigen: with HCV antigen 4 ℃ of dialysed overnight of PBS to 0.02M pH7.2 (pH7.0-7.6 all is suitable for), adjustment concentration is 2mg/ml, to activate biotin in advance and use the DMSO dissolving, final concentration is 50mM, the biotin solution that in antigen or antibody-solutions, adds aequum with 20: 1 molecule ratios, room temperature reaction 1 hour, to 4 ℃ of dialysed overnight of PBS of 0.02M pH7.2 (pH7.0-7.6 all is suitable for) ,-20 ℃ of preservations are standby behind the adding equal-volume glycerine.
Biotinylated antigen mixes with streptavidin magnetic particle: the amount with 0.5 μ l/mg adds biotinylation HCV antigen in streptavidin magnetic particle solution, fully uses the preservation damping fluid with 1: 5 ratio mixture diluted fiberglass packing to be sprayed to be used behind the mixing.
The spraying of D, magnetic particle and freeze-drying
That uses BioDot spray film instrument nozzle specially usedly evenly is sprayed at the magnetic particle handled well the amount with 20 μ l/cm on the 0.8cm width fiberglass packing, the frozen overnight drying, add drying agent seal up for safekeeping standby,
The processing of E, sample pad
1.8cm width sample pad is put into sample pad Treatment Solution immersion treatment take out 25-35 ℃ of oven dry 8 hours after 1 hour.
The sample pad treating fluid is the PBS solution that contains the PVA of 1%-5%Casein and 0.1%-1% and the 0.02M pH7.2 of 0.01-0.2%Tween-20 (pH7.0-7.6 all is suitable for).
The assembling of F, test strips and cutting
Following all operations all must carry out in temperature 20-25 ℃ the room in humidity less than 20%.
The assembling of test paper plate: use as requested that 3.5cm is the wide coated film of BioDot LM5000 type assembling instrument, 2.5cm wide thieving paper, the magnetic mat of particles that 0.8cm is wide, the wide sample pad of 1.8cm are assembled on the 9.8cm width transparent plastic base plate, stick upper strata transparent plastic cover plate, be assembled into test paper plate.
Cutting of test strips: use BioDot CM4000 type cutting cutter that the test paper plate that assembles is cut into the wide finished product test strips of 0.5cm.
The assembling of G, test card
The single part test strips of well cutting of the present invention is placed in the draw-in groove on the plastic bottom card, covers loam cake, use card press machine up and down two plastic clips compress, guarantee that whole test strips is in tensioned state.Adding the drying agent room temperature seals up for safekeeping standby.
H, determine the 2 D code information of this batch
The name of an article: HCV magnetic detection card
Batch: on the assembling date of test strips, form is: Year/Month/Day, XXXX/XX/XX
Determining of yin and yang attribute interpretation standard: get 200 parts and confirm HCV antibody positive sample (power all has), 500 parts at random sample use this batch test strips to detect, use the magnetism detector testing result, calculate the T/C value of each test card, use statistical method computation of mean values and standard deviation, determine: T/C＜0.2 is negative, and T/C＞0.3 is positive, is gray area between the two.
The printing of I, two-dimension code is pasted
With in the above-mentioned 2 D code information input two-dimension code printer and print, two-dimension code is pasted on the ad-hoc location of test card, use two-dimension code paste position detecting device to inspect 2% at random by random samples and guarantee that two-dimension code pastes errorless.
J, finished product packing
The single part test card and that the posts two-dimension code drying prescription of being responsible for a task until it is completed is sealed in the aluminium foil bag, 100 person-portions are that a packing places in the packing box, and a instructions of a box and 1 bottle of 10ml dress chromatography damping fluid are promptly made paper box, this paper box keeps in Dark Place in room temperature, and the shelf-life is 18 months.The chromatography buffer formulation is: 1%Tween-20, and 0.5%Triton X-100,1%NP-40,0.05%NaN3, the PBS of 20mmol pH7.2 (pH7.0-7.6 all is suitable for).
Except; In the step of the preparation of streptavidin magnetic particle: it is 1: 3 that streptavidin makes streptavidin and magnetic proportion of particles.Other step is with embodiment 1,
In the step except the preparation of streptavidin magnetic particle: it is 1: 8 that streptavidin makes streptavidin and magnetic proportion of particles.Other step is with embodiment 1.
In the blend step except biotinylated antigen and streptavidin magnetic particle: fully use the preservation damping fluid with 1: 15 ratio mixture diluted fiberglass packing to be sprayed to be used behind the mixing, other step is with embodiment 1.
Embodiment 5
In the blend step except biotinylated antigen and streptavidin magnetic particle: fully use the preservation damping fluid with 1: 20 ratio mixture diluted fiberglass packing to be sprayed to be used behind the mixing, other step is with embodiment 1.
Embodiment 6
The using method of test card of the present invention
1, application of sample
From packing box, take out single part test card, tear the aluminium foil strip packing, test strips is placed on the smooth desktop, get 50 μ l sample serum with micropipettor and add in the well on the card, add 50 μ l chromatography damping fluids again, wait question response to carry out 15 minutes.
2, measurement and result output
The MICT detector is started shooting in advance, test card is inserted the card inserting mouth of detector, the operation instrument, instrument can read the 2 D code information on the card automatically and measure, and prints measurement result immediately, and the yin and yang attribute result can show in print result.
Embodiment 7
Test card clinical samples testing result of the present invention
The clinical detection analysis of results table
| The clinical trial project | MICT result | The MICT interpretation of result | The collaurum result | The collaurum interpretation of result |
| 747 parts in normal human serum sample | 746 parts of feminine genders | Specificity is 99.87% | 743 parts of feminine genders | Specificity is 99.46% |
| 408 parts of HCV antibody positive blood serum samples | 408 parts of positives | Sensitivity is 100.00% | 406 parts of positives | Sensitivity is 99.50% |
Test strips of the present invention and import HCV colloid gold reagent have carried out contrast test, and the result all is being better than colloid gold reagent aspect specificity and the sensitivity, have improved recall rate and shortened to detect window phase, for the detection of early infection HCV provides good method.
Claims (7)
1. magnetic immuno-chromatographic test paper strip that detects HCV antibody, it is characterized in that: this test strips is that coated film, the magnetic mat of particles that combines HCV antigen, sample pad, adsorptive pads are sticked on the base plate successively interlaced 2mm, cover the transparent plastic diaphragm seal then on the upper strata and assemble, be coated with HCV Detection of antigen line and nature controlling line on the wherein said coated film in advance.
2. the magnetic immuno-chromatographic test paper strip of detection HCV antibody according to claim 1 is characterized in that: adopt the reaction pattern of double antigens sandwich to detect HCV antibody.
3. the preparation method of the magnetic immuno-chromatographic test paper strip of detection HCV antibody according to claim 1 is characterized in that: may further comprise the steps:
The preparation of A, antigen: select the commercialization HCV reorganization pairing antigen of technique for gene engineering preparation for use, to 20mM, 4 ℃ of dialysed overnight of the PBS of pH7.0-7.6;
The preparation of B, magnetic particle: selecting diameter for use is the super paramagnetic particle of 100-300nm, the mode of using carbodiimide and succinimide covalent coupling with the streptavidin mark to the magnetic particle, select for use pre-activation biotin to carry out the mark of HCV antigen, the biotinylated antigen that mark is good is with 1: 2-1: 10 ratio (volume ratio) is mixed with streptavidin magnetic particle, guarantees that streptavidin magnetic particle is excessive;
C, use quantitative liquid-jet device to be sprayed on the magnetic mat of particles magnetic particle for preparing with the amount of 5 μ l/cm-30 μ l/cm;
The preparation of D, coated film: use 0.02mM, the PBS of pH7.0-7.6, respectively HCV envelope antigen and biotinylation bovine serum albumin(BSA) are diluted to the concentration of 0.5-1.0mg/ml, use quantitative liquid-jet device respectively with the two with the interval spray printing of 0.5-0.8cm on nitrocellulose filter, dry the back and in confining liquid, soak after 10 minutes, add drying agent and seal up for safekeeping standby in 25-35 ℃ of oven dry 8 hours;
The processing of E, sample pad: sample pad is put into sample pad Treatment Solution immersion treatment take out 25-35 ℃ of oven dry 8 hours after 1 hour;
The assembling of F, test card: interlaced successively 2mm sticks coated film, magnetic mat of particles, sample pad, adsorptive pads on the transparent plastic base plate, cover the transparent plastic diaphragm seal then on the upper strata, obtain test paper plate, width cutting promptly obtains test strips as requested, and test strips is packed into to compress in the plastic clip promptly obtains test card.
4. the magnetic immuno-chromatographic test paper strip of detection HCV antibody according to claim 1, it is characterized in that: described sample pad is through the pretreated cellulose membrane of sample pad treating fluid, described sample pad treating fluid is the polyvinyl alcohol (PVA) that contains 1%-5% casein and 0.1%-1%, and the 0.02M of 0.01-0.2% Tween-20, the phosphate buffered solution of pH7.0-7.6.
5. the preparation method of the magnetic immuno-chromatographic test paper strip of detection HCV antibody according to claim 3 is characterized in that described step B comprises following three steps:
1) preparation of streptavidin magnetic particle: use the 50mM that contains 0.1%Tween-20, the sodium-acetate buffer washing magnetic particle of pH4.5-5.0, adding carbodiimide and succinimide makes the two final concentration be 20mmol/L, room temperature reaction 1 hour, use contains the 50mM of 0.1%Tween-20, the sodium-acetate buffer of pH4.5-5.0 fully washs and adds streptavidin behind the magnetic particle to make the molecule ratio of streptavidin and magnetic particle be 5: 1, room temperature reaction 3 hours, add the 0.02M that contains 0.5%BSA, the PBS room temperature sealing of pH7.0-7.6 30 minutes, use contains the 50mM of 0.1%Tween-20, and the sodium-acetate buffer washing magnetic particle of pH4.5-5.0 uses then and contains 1%PVP, 0.5%Tween-20, the 50mM of 5% sucrose, the boric acid of pH8.2-9.0 preserve damping fluid redissolution magnetic particle, and 4 ℃ of preservations are standby;
2) preparation of biotinylation HCV antigen: with HCV antigen to 0.02M, 4 ℃ of dialysed overnight of the PBS of pH7.0-7.6, adjustment concentration is 2mg/ml, to activate biotin in advance and use dmso solution, final concentration was 50mM, added the biotin solution of aequum in antigen or antibody-solutions with 40: 1 molecule ratios, room temperature reaction 1 hour, to 0.02M, 4 ℃ of dialysed overnight of the PBS of pH7.0-7.6 ,-20 ℃ of preservations are standby behind the adding equal-volume glycerine;
3) biotinylated antigen and streptavidin magnetic particle mixes, amount with 0.25 μ l/mg magnetic particle adds biotinylation HCV antigen in streptavidin magnetic particle solution, fully use behind the mixing and preserve damping fluid with 1: 5-1: 20 ratio (volume ratio) is used mixture diluted fiberglass packing to be sprayed.
6. preparation method according to claim 3, it is characterized in that: among the described step C, the spraying method of magnetic particle is: use quantitative spray film device evenly to be sprayed on the glass fibre with the amount of 10 μ l/cm the magnetic particle for preparing, add drying agent after the freeze drying and seal up for safekeeping standby.
7. preparation method according to claim 3, it is characterized in that: among the described step D, the preparation method of coated film is: being cushioned liquid with bag is 0.5mg/ml with the HCV antigen diluent, biotinylation BSA dilution is 1mg/ml, use quantitative spray film device with the amount of 1ul/cm with the three with the interval spray printing of 0.6cm on nitrocellulose filter, room temperature is dried after 30 minutes and to be soaked in confining liquid after 10 minutes in 25-35 ℃ of oven dry 8 hours, adds drying agent and seals up for safekeeping standby.
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