CN100403030C - ELISA kit for detecting Sudan red medicines and detection method thereof - Google Patents

Abstract

The present invention provides an ELISA kit for detecting Sudan red medicine, which comprises an enzyme labeled plate with a coating antigen, an enzyme marker, specific antibody concentrated solution of Sudan red medicine (which exists when an antigen is coated on the enzyme labeled plate and the enzyme marker is an enzyme labeled anti-antibody or the anti-antibody is coated on the enzyme labeled plate and the enzyme marker is an enzyme labeled antigen), standard product solution of Sudan red, substrate color developing solution, stop solution, concentrated washing solution, concentrated antibody dilute solution (which exists when the antigen is coated on the enzyme labeled plate and the enzyme marker is the enzyme labeled anti-antibody or the anti-antibody is coated on the enzyme labeled plate and the enzyme marker is the enzyme labeled antigen), and concentrated composite solution. The present invention also discloses a method for detecting Sudan red medicine by the ELISA kit, which comprises the steps: firstly, samples are pretreated; then, the ELISA kit is used for detection; finally, a detecting result is analyzed. The provided ELISA kit is used for detecting the residual quantity of dye of Sudan red medicine in chilli sauce, chilli oil and paprika food. The ELISA kit has the advantages of simple and convenient operation, low expense, high sensitivity and on-site monitoring, and is suitable for screening large amounts of the samples.

Description

Detect the enzyme linked immunological kit and the method for Sudan red medicines

Technical field

The present invention relates to a kind of enzyme linked immunological kit and method that detects Sudan red medicines in thick chilli sauce, chilli oil, the chilli powder food.

Background information

Tonyred (SudanI) is a kind of orchil of synthetic, and a kind of industrial dye of Chang Zuowei is widely used in the aspect of adding lustre to such as hyperchromic and footwear, floor as solvent, oil, wax, gasoline.Coloring agent of the Sudan contains " azobenzene ", after " azobenzene " is degraded, will produce " aniline ", and this is a kind of moderately toxic carcinogenic substance.Excessive " aniline " is inhaled into human body, may cause histanoxia, unsmooth breath, cause central nervous system, cardiovascular system other internal organs of unifying are impaired, even cause infertility, because of its serious carcinogenicity, states such as sensitization and genetoxic China and European Union have expressly provided and have forbidden that it adds in food as pigment, on February 18th, 2005, FSA (TheFoodStandardAgency, FSA) just contain the food that adds the tonyred pigment and give a warning, and on its website, announced the product inventory that may contain Sudan red 1 to the consumer.

The chemical method that detects the tonyred residual quantity has high performance liquid chromatography at present, because complicated instrument and equipment and loaded down with trivial details process are not suitable for on-site supervision and great amount of samples examination.

Summary of the invention

(1) technical matters that will solve

The purpose of this invention is to provide a kind of easy and simple to handle, expense is cheap, highly sensitive, can on-site supervision and the method for suitable great amount of samples examination be used for detecting the residual quantity of thick chilli sauce, chilli oil, chilli powder food tonyred dyestuff.

(2) technical scheme

Detection principle of the present invention is:

When on capillary strip, wrapping in advance by the tonyred coupled antigen, after adding sample solution or standard solution, add tonyred specific antibody solution again, the tonyred coupled antigen competition tonyred specific antibody of bag quilt on residual tonyred or tonyred standard items and the ELISA Plate in the sample, add the enzyme labeling antiantibody and carry out amplification, with colour developing liquid colour developing, the content of tonyred becomes negative correlation in sample light absorption value and the sample, relatively can draw the residual quantity of tonyred in the sample with typical curve.Simultaneously also can be according to the depth of color on the ELISA Plate, with the comparison of the series concentration tonyred standard solution color concentration range of tonyred residual quantity in the judgement sample roughly.

When on capillary strip, wrapping in advance by the tonyred specific antibody, after adding sample solution or standard solution, add enzyme labeling tonyred haptens solution again, the competition of residual tonyred or tonyred standard items and enzyme-labelled antigen is coated on the tonyred specific antibody on the ELISA Plate in the sample, with the colour developing of colour developing liquid, the sample light absorption value becomes negative correlation with the content of Sudan red medicines, relatively can draw the residual quantity of tonyred in the sample with typical curve.Simultaneously also can be according to the shade on the ELISA Plate, with the comparison of the tonyred standard solution color of the series concentration concentration range of tonyred residual quantity in the judgement sample roughly.

When on capillary strip, wrapping in advance by the tonyred coupled antigen, after adding sample solution or standard solution, add enzyme labeling tonyred specific antibody solution again, the tonyred antigenic competition tonyred specific antibody of bag quilt on residual tonyred or tonyred standard items and the ELISA Plate in the sample, with the colour developing of colour developing liquid, the content of tonyred becomes negative correlation in sample light absorption value and the sample, relatively can draw the residual quantity of tonyred in the sample with typical curve.Simultaneously also can be according to the shade on the ELISA Plate, with the comparison of the series concentration tonyred standard solution color concentration range of tonyred residual quantity in the judgement sample roughly.

When on capillary strip, wrapping in advance by antiantibody, after adding the tonyred antibody incubation, add sample solution or standard solution, add enzyme labeling tonyred haptens solution again, residual tonyred or tonyred standard items and enzyme labeling tonyred haptens competition tonyred specific antibody in the sample, with colour developing liquid colour developing, the content of tonyred becomes negative correlation in sample absorbance and the sample, relatively can draw the residual quantity of tonyred in the sample with typical curve.Simultaneously also can be according to the shade on the ELISA Plate, with the comparison of the series concentration tonyred standard solution color concentration range of tonyred residual quantity in the judgement sample roughly.

The invention provides a kind of enzyme linked immunological kit that is used to detect the tonyred thing, it contains:

(1) is coated with the ELISA Plate (coating antigen is antigen, antibody or antiantibody) of coating antigen;

(2) enzyme labeling thing (being enzyme-labelled antigen, enzymic-labelled antibody or enzyme labeling antiantibody);

(3) tonyred specific antibody concentrate (when envelope antigen on the ELISA Plate and enzyme labeling thing are that bag is contained during for enzyme-labelled antigen by antiantibody and enzyme labeling thing on enzyme labeling antiantibody or the ELISA Plate);

(4) tonyred standard solution;

(5) substrate colour developing liquid;

(6) stop buffer;

(7) concentrated cleaning solution;

(8) concentrated antibody dilution (when envelope antigen on the ELISA Plate and enzyme labeling thing are that bag is contained during for enzyme-labelled antigen by antiantibody and enzyme labeling thing on enzyme labeling antiantibody or the ELISA Plate).

(9) concentrate redissolution liquid.

The enzyme linked immunological kit of detection tonyred provided by the present invention, comprise the ELISA Plate that is coated with coating antigen, may contain tonyred specific antibody concentrate (envelope antigen on the ELISA Plate, the antiantibody of bag quilt when the enzyme labeling thing is the enzyme labeling antiantibody or on the ELISA Plate, the enzyme labeling thing is an enzyme-labelled antigen) and enzyme labeling thing working fluid; Described coating antigen can be tonyred coupled antigen, tonyred specific antibody or antiantibody; The antiantibody that described enzyme labeling thing is an enzyme labeling, tonyred haptens or tonyred specific antibody; Described antiantibody is sheep anti mouse antiantibody or goat-anti rabbit antiantibody.

Described tonyred haptens obtains tonyred and succinic anhydride by acylation reaction.

The marker enzyme of described enzyme labeling thing is horseradish peroxidase or alkaline phosphatase, wherein preferred horseradish peroxidase; The sheep anti mouse antiantibody of enzyme labeling or goat-anti rabbit antiantibody adopt glutaraldehyde method or sodium periodate method that marker enzyme and antiantibody are carried out coupling and obtain, horseradish peroxidase can adopt several different methods of the prior art that itself and antiantibody are carried out coupling, as glutaraldehyde method, sodium periodate method etc., the present invention creates through long-term work the sodium periodate method is improved, make it save time, reduce the concentration rate of horseradish peroxidase (HRP) and antiantibody, saved starting material.

Described tonyred specific antibody can be tonyred monoclonal antibody or tonyred polyclonal antibody; They all are to obtain as immunogene with the conjugate that tonyred haptens and carrier protein adopt mixed anhydride method to obtain; Described tonyred polyclonal antibody can be mouse source, Ma Yuan, Yang Yuan, rabbit source or cavy source antibody, and described tonyred monoclonal antibody is preferably the tonyred mouse monoclonal antibody, and described tonyred polyclonal antibody is preferably the tonyred rabbit polyclonal antibody.

Described tonyred monoclonal antibody is preferably the monoclonal antibody of the monoclonal hybridoma strain B-1-1CGMCC No.1706 secretion of anti-tonyred.

The monoclonal hybridoma strain B-1-1 CGMCC No.1706 of described anti-tonyred has been preserved in China Committee for Culture Collection of Microorganisms common micro-organisms center (being called for short CGMCC) on April 30th, 2006.

Above antibody all can prepare by mixed anhydride method as immunogene with the conjugate of tonyred haptens and carrier protein.Described carrier protein can be common carrier albumen such as mouse haemocyanin, thyroprotein (BCG), bovine serum albumin(BSA), rabbit anteserum albumen, human serum albumins, ovalbumin or hemocyanin; The conjugate of described tonyred haptens and carrier protein can obtain by tonyred haptens and carrier protein are carried out coupling with mixed anhydride method.

For more convenient on-site supervision and great amount of samples examination, described kit also comprises tonyred standard solution, substrate colour developing liquid, stop buffer, concentrated cleaning solution, concentrated antibody dilution (envelope antigen on the ELISA Plate, the antiantibody of bag quilt when the enzyme labeling thing is the enzyme labeling antiantibody or on the ELISA Plate, the enzyme labeling thing is an enzyme-labelled antigen), the liquid that concentrate to redissolve is 2 * the phosphate buffer of 0.04mol/L.

Described concentrated cleaning solution is 0.01M, and pH 7.4, contains the phosphate buffer of 0.8%～1.2% polysorbas20 and 0.5% Sodium azide antiseptic.

Described concentrated redissolution liquid is 2 * the phosphate buffer of 0.04mol/L.

Described when marker enzyme is horseradish peroxidase, substrate colour developing liquid is made up of colour developing liquid A liquid and colour developing liquid B liquid, and colour developing liquid A liquid is hydrogen peroxide or urea peroxide, and described colour developing liquid B liquid is o-phenylenediamine or tetramethyl benzidine, and stop buffer is 1～2mol/L sulfuric acid; When marker enzyme was alkaline phosphatase, colour developing liquid was p-nitrophenyl phosphate damping fluid, and stop buffer is 1～2mol/L sodium hydroxide solution.

Envelope antigen on ELISA Plate, the antiantibody of bag quilt when the enzyme labeling thing is the enzyme labeling antiantibody or on the ELISA Plate, described concentrated antibody dilution was pH8.6 when the enzyme labeling thing was enzyme-labelled antigen, and 0.05mol/L contains the phosphate buffer of 2% calf serum, 10% methyl alcohol.

Wherein ELISA Plate used bag in preparation process is cushioned the sodium citrate buffer solution that liquid is pH 6.6 0.01～0.03mol/L; Used confining liquid contains 0.5% horse serum, 1 ‰ sodium azide, 3% caseic phosphate buffer.

The preparation process of ELISA Plate is among the present invention: be cushioned liquid with bag coating antigen is diluted to 0.05-0.1 μ g/ml, every hole adds 100 μ l, 37 ℃ of incubation 2h, and 4 ℃ are spent the night again, coating buffer inclines, with cleansing solution washing 2 times, each 30 seconds, pat dry, in every hole, add 150-200 μ l confining liquid then, 37 ℃ of incubation 1-2h, liquid pats dry in the hole of inclining, and preserve with the vacuum seal of aluminium film dry back.

The building-up process of antigen is among the present invention:

1. haptenic synthetic

Tonyred is synthesized the tonyred haptens with the succinic anhydride method.

2. the preparation of tonyred antibody

Adopt mixed anhydride method (isobutyl chlorocarbonate) to carry out coupling tonyred haptens and carrier protein and obtain immunogene.

Tonyred is a small-molecule substance, has only immunoreactivity, does not have immunogenicity, can not bring out body and produce immune response, must with the macromolecular carrier albumen coupling after just have immunogenicity.Therefore with tonyred and the synthetic tonyred haptens of succinic anhydride, picked out a spacerarm that contains 4 carbon, given prominence to the characteristic group in the Sudan molecules structure like this, made the tonyred antibody of preparation very high the specificity of tonyred to tonyred.

The preparation of tonyred mouse monoclonal antibody

The animal immune program: adopting the Balb/c mouse as immune animal, is immunogene with tonyred haptens and carrier protein couplet thing, obtains polyclonal antibody preferably, takes out liver and carries out Fusion of Cells.

Fusion of Cells and cloning: get immune BALB/c mouse splenocyte and SP2/0 myeloma cell and merge, the screening cell line is up to the hybridoma cell strain that obtains the stably excreting monoclonal antibody.

The preparation of tonyred rabbit polyclonal antibody

Adopting new zealand white rabbit as immune animal, is that immunogene is carried out immunity to new zealand white rabbit with tonyred and carrier protein couplet thing, and repeatedly the immunity back is measured serum antibody titer and obtained polyclonal antibody.

The preparation process of antiantibody of the present invention: the sheep anti mouse antiantibody be with sheep as immune animal, be that immunogene is carried out immunity to anosis thalline sheep with mouse source antibody, obtain the sheep anti mouse antiantibody; Goat-anti rabbit antiantibody be with sheep as immune animal, be that immunogene is carried out immunity to anosis thalline sheep with rabbit source antibody, obtain goat-anti rabbit antiantibody.

Tonyred standard solution in the kit of the present invention: 6 bottles of standard solutions, 0 μ g/L, 0.1 μ g/L, 0.4 μ g/L, 1.6 μ g/L, 6.4 μ g/L, 25.6 μ g/L, 3ml/ bottle.

The present invention also provides a kind of method that above-mentioned enzyme linked immunological kit detects Sudan red medicines of using, and it comprises step:

(1) sample pre-treatments;

(2) detect with kit;

(3) analyzing and testing result.

The invention provides with the tonyred is sample (water-based, oil matrix and the Powdered) processing of food additives food, take by weighing sample in centrifuge tube, add centrifugal extraction of acetonitrile concussion, pipetting supernatant nitrogen dries up, adding normal hexane extracts, the highly basic decon is got upper strata nitrogen and is dried up, and is used for detecting.

Among the present invention be: when coating antigen is the tonyred coupled antigen with the kit detection, adding standard solution or sample solution add antibody again in the ELISA Plate micropore, washing pats dry behind the incubation, add enzyme mark antiantibody again, washing pats dry behind the incubation, colour developing, termination are measured absorbance with microplate reader; When coating antigen was the tonyred coupled antigen, adding standard solution or sample solution added enzymic-labelled antibody again in the ELISA Plate micropore, and washing pats dry behind the incubation, and colour developing, termination are measured absorbance with microplate reader; When coating antigen was the tonyred specific antibody, adding standard solution or sample solution added enzyme labeling tonyred haptens again in the ELISA Plate micropore, and washing pats dry behind the incubation, and colour developing, termination are measured absorbance with microplate reader; When coating antigen is antiantibody, in the ELISA Plate micropore, add tonyred antibody, washing pats dry behind the incubation, add enzyme mark tonyred haptens after adding standard solution or sample solution again, washing pats dry behind the incubation, and colour developing, termination are measured absorbance with microplate reader.

The testing result analytic process is among the present invention: the absorbance mean value (B) of standard solution of using each concentration that is obtained is divided by the absorbance (B of first standard solution (0 standard)₀) multiply by 100% again, i.e. percentage absorbance.Computing formula is:

Percentage absorbance (%)=(B/B₀) * 100%

Semilog value with the concentration (μ g/L) of tonyred standard solution is an X-axis, and the percentage absorbance is a Y-axis, the drawing standard curve map.With the percentage absorbance of same way calculation sample solution, the concentration of corresponding each sample then can be read the residual quantity of tonyred the sample from typical curve.

The analysis of testing result also can be adopted regression equation method among the present invention, calculates sample solution concentration.

The analysis of testing result can also utilize computer professional software among the present invention, the be more convenient for express-analysis of a large amount of samples of this method, and whole testing process only needed to finish in 1.5 hours, and the sample lowest detection is limited to 8 μ g/L (kg).

(3) beneficial effect

The enzyme linked immunological kit that detects tonyred in the food among the present invention mainly adopts the residual quantity of tonyred dyestuff in the food such as the qualitative or detection by quantitative thick chilli sauce of indirect competitive ELISA method, chilli oil, chilli powder, sample pretreatment process is simple, can detect gross sample simultaneously.

The present invention adopts the tonyred monoclonal antibody or the polyclonal antibody of high specific, main agents provides with the working fluid form, the method of inspection is simple and easy to do, has characteristics such as specificity height, highly sensitive, degree of accuracy height, will be in food plays a significant role in the residue detection of tonyred.

Description of drawings

Fig. 1: the examination criteria curve map of tonyred.

Embodiment

Further set forth the present invention below in conjunction with specific embodiment.Should be understood that these embodiment only are used to illustrate the present invention, and be not used for limiting the scope of the invention.

The preparation of embodiment 1 reagent constituents

1. antigen is synthetic

A. haptenic synthetic

Tonyred is synthesized the tonyred haptens with the succinic anhydride method.Concrete steps: get tonyred 5g and be dissolved among the 20mlDMF and addedsuccinic anhydride 3g and 80 ℃ of back flow reaction of50ml pyridine 70～80 hours, drain that removing desolvates and dry and get final product with pure water washing 5 times (30ml/ time).

B. immunogene is synthetic

With tonyred haptens and ovalbumin, adopt mixed anhydride method to carry out coupling and obtain immunogene.

Immunogenic preparation process: get tonyred haptens 2g and be dissolved in 30ml, 50% N, in the dinethylformamide solution, getting the 0.5ml isobutyl chlorocarbonate again is dissolved in the no Shui diox of 5ml, be added in the haptens solution stirring at room reaction 4 hours, get carrier protein 32g and be dissolved in the 70ml pH9.6 carbonate buffer solution, will go into human serum albumins again and be added drop-wise in the haptens 4 ℃ of stirrings and spend the night.The artificial antigen that has reacted is installed the phosphate buffer of putting into 0.2M with bag filter dialysed 7 days, change liquid every day 3～4 times.At last the antigen freeze-drying is preserved.

C. the preparation of coating antigen tonyred coupled antigen

With tonyred haptens and thyroprotein, adopt mixed anhydride method to carry out coupling and obtain envelope antigen.

The preparation process of coating antigen: get tonyred haptens 2g and be dissolved in 30ml, 50% N, in the dinethylformamide solution, getting the 0.5ml isobutyl chlorocarbonate again is dissolved in the no Shui diox of 5ml, be added in the haptens solution stirring at room reaction 4 hours, get carrier protein 32g and be dissolved in the 70ml pH9.6 carbonate buffer solution, again ovalbumin is added drop-wise in the haptens 4 ℃ of stirrings and spends the night.The artificial antigen that has reacted is installed the phosphate buffer of putting into 0.2M with bag filter dialysed 7 days, change liquid every day 3～4 times.At last the antigen freeze-drying is preserved.

2. MONOCLONAL ANTIBODIES SPECIFIC FOR

A. animal immune

Immunogene is injected in the Balb/c mouse body, and immunizing dose is 80 μ g/, makes it produce polyclonal antibody.

B. Fusion of Cells and cloning

Get immune Balb/c mouse boosting cell, merge, adopt indirect competitive ELISA to measure cell conditioned medium liquid, screen positive hole in 5: 1 ratios and SP2/0 myeloma cell.Utilize limiting dilution assay that cloning is carried out in positive hole, up to the monoclonal hybridoma strain B-1-1 of the hybridoma cell strain-tonyred that obtains stably excreting monoclonal antibody CGMCC No.1706.

C. cell cryopreservation and recovery

The monoclonal hybridoma strain of tonyred is made 1 * 10 with cryopreserving liquid⁶The cell suspension of individual/ml is in the medium-term and long-term preservation of liquid nitrogen.Take out frozen pipe during recovery, put into 37 ℃ of water-bath middling speeds immediately and melt, behind the centrifugal removal cryopreserving liquid, move in the culture flask and cultivate.

D. MONOCLONAL ANTIBODIES SPECIFIC FOR and purifying

The Balb/c mouse peritoneal is only injected sterilization paraffin oil 0.4ml/, the monoclonal hybridoma strain 5 * 10 of 7 days pneumoretroperitoneum injection tonyreds⁵Individual/as only, to gather ascites after 7 days.Carry out purifying with sad-saturated ammonium sulfate method, the ascites behind the purifying is put into-20 ℃ of environment and is preserved.

3. Polyclonal Antibody Preparation

Adopt new zealand white rabbit as immune animal, with tonyred haptens and ovalbumin conjugate is immunogene, immunizing dose is 1.5mg/kg, when head exempts from the Fu Shi of immunogene and equivalent helped fully and be mixed and made into emulsifying agent, the subcutaneous multi-point injection of nape portion, getting the same dose immunogene 3～4 weeks adds equivalent incomplete Freund mixing and emulsifying at interval, and booster immunization is once, immunity is 5 times altogether, does not add adjuvant for the last time.Serum antibody titer is measured in last immunity blood sampling after 10 days, and heart is taken a blood sample, and obtains the polyclonal antibody of purifying with ammonium sulfate precipitation.

4. the preparation process of sheep anti mouse antiantibody: as immune animal, is that immunogene to pathogen-free domestic goat carry out immunity with mouse source antibody with goat, obtains the sheep anti mouse antiantibody; The preparation of goat-anti rabbit antiantibody: as immune animal, is that immunogene to pathogen-free domestic goat carry out immunity with rabbit source antibody with goat, obtains goat-anti rabbit antiantibody.

5. the preparation of ELISA Plate

Be cushioned liquid with bag tonyred coupled antigen, antibody or antiantibody are diluted to 0.05-0.1 μ g/ml, every hole adds 100 μ l, 37 ℃ of incubation 2h or 4 ℃ spend the night, and the coating buffer that inclines is with the concentrated cleaning solution washing of 20 times of dilutions 2 times, each 30 seconds, pat dry, in every hole, add 150 μ l confining liquids, 37 ℃ of incubation 2h then, the liquid in the hole that inclines, preserve with the vacuum seal of aluminium film dry back.

Embodiment 2 detects the establishment of the enzyme linked immunological kit of tonyred

Set up the enzyme linked immunological kit that detects tonyred, make it comprise following component:

(1) bag is by the ELISA Plate of tonyred coupled antigen;

(2) the sheep anti mouse antiantibody of usefulness horseradish peroxidase-labeled;

(3) tonyred monoclonal antibody body concentrate;

(4) the tonyred standard solution is 6 bottles, and concentration is respectively 0 μ g/L, 0.1 μ g/L, 0.4 μ g/L, 1.6 μ g/L, 6.4 μ g/L, 25.6 μ g/L;

(5) substrate colour developing liquid is made up of A liquid and B liquid, and substrate colour developing liquid A liquid is urea peroxide, and substrate colour developing liquid B liquid is tetramethyl benzidine;

(6) stop buffer is a 2mol/L hydrochloric acid;

(7) concentrated cleaning solution is 0.01M, and pH 7.4, contains the phosphate buffer of 0.8%～1.2% polysorbas20 and 0.5% sodium azide antiseptic;

(8) antibody diluent is pH8.6, and 0.05mol/L contains the phosphate buffer of 2% calf serum, 10% methyl alcohol.

(9) concentrate to redissolve liquid be 2 * the phosphate buffer of 0.04mol/L.

The residual detection of tonyred in embodiment 3 samples

1. sample pre-treatments

With the tonyred is sample (water-based, oil matrix and the Powdered) treatment step of food additives food

Take by weighing the 2g sample in centrifuge tube, add the 10ml acetonitrile, concuss 10min, the above centrifugal 10min of room temperature 3000rpm.Pipetting 5ml supernatant nitrogen under 50 ℃ of environment dries up.Add the dry residue of 4ml normal hexane whirling motion 30s dissolving, add the centrifugal 10min of 1ml 1M NaOH whirling motion 15s room temperature 3000rpm, pipetting 1ml supernatant nitrogen under 50 ℃ of environment dries up, add 0.5ml DMF and fully dissolve dry residue, get 50 μ l and add 950 μ l and dilute the good abundant mixing of redissolution liquid, obtain testing sample solution.

2. detect with kit

In the ELISA Plate micropore of tonyred coupled antigen bag quilt, add tonyred standard solution orsample solution 50 μ l, add tonyred monoclonalantibody working fluid 50 μ l again, with cover plate film shrouding, react 30min in 37 ℃ of constant temperature ovens, pour out liquid in the hole, every hole adds 250 μ l cleansing solutions, pours out liquid in the hole after 30 seconds, so repetitive operation is washed plate 5 times altogether, pats dry with thieving paper.The sheep anti mouseantiantibody working fluid 100 μ l that add horseradish peroxidase-labeled, react 30min in 37 ℃ of constant temperature ovens, pour out liquid in the hole, the repeated washing step, every hole adds substrate colour developing liquid A liquid urea peroxide, substrate colour developing liquid B liquid tetramethyl benzidine (TMB), the mixing that vibrates gently, 37 ℃ of constant temperature oven lucifuge colour developing 15min, every hole adds 2mol/L stop bufferhydrochloric acid 50 μ l, the mixing that vibrates is gently used microplate reader, measures every hole absorbance.

3. testing result analysis

With the absorbance mean value (B) of the standard solution of each concentration that is obtained absorbance (B divided by first standard solution (0 standard)₀) multiply by 100% again, obtain the percentage absorbance.Semilog value with tonyred standard items concentration (μ g/L) is an X-axis, and the percentage absorbance is a Y-axis, the drawing standard curve map.With the percentage absorbance of same way calculation sample solution, the concentration of corresponding each sample, then can read the residual quantity of tonyred the sample from typical curve.

Experimental example 1

The test of standard items precision:

Respectively extract a collection of ELISA Plate out respectively from the ELISA Plate of three different time period preparations, every batch is extracted 10 kits, and every plate is extracted 20 micropores out, measures the accurate solution absorbency value of 4.5 μ g/L, calculates the coefficient of variation.

The repeatable test of table 1 standard (CV%)

Can draw by above-mentioned test findings, every batch of kit measured 10 standard items coefficient of variation between 3.8%～11.7%, meets precision and is less than or equal to 20% regulation.

Experimental example 2

Sample precision and accuracy test

A. sample precision test:

Get the tonyred standard specimen, add 15 μ g/L in sample, get each three of the kits of three different batches respectively, each concentration repeats 5 times, calculates the coefficient of variation respectively, the results are shown in Table.

Table 2 water-based adds the repeatable test of dye sample

Table 3 oil matrix adds the repeatable test of dye sample

The repeatable test of the Powdered interpolation dye sample of table 4

The result shows that water-based adds dye sample Variation Lines number average and is lower than 25%, and the Variation Lines number average that oil matrix adds dye sample is lower than 25%, and the Variation Lines number average of Powdered interpolation dye sample is lower than 25%.

B. sample accuracy test

The tonyred standard solution of getting three concentration is respectively 10 μ g/kg (L), 50 μ g/kg (L) and 100 μ g/kg (L), respectively sample is added recovery test, each concentration do 4 parallel, sample pre-treatments step among concrete grammar such as the embodiment 1, respectively accuracy in computation.

The accuracy of table 5 kit

The result shows that water-based adds dye sample and adds accuracy between 60.8%-102.3%, and oil matrix adds dye sample and adds accuracy between 63.5%-94.8%, and Powdered interpolation dye sample adds accuracy between 62.8%-92.6%.

Experimental example 3

The cross reacting rate test:

Select to have 2 kinds of drug monitoring cross reacting rates of similar structures and similar functions with tonyred.The typical curve of logical various medicines obtains its 50% inhibition concentration respectively.Calculate the cross reacting rate of kit with following formula to other medicines.Cross reaction is big more, and this kit is just good more to the specificity of the detection of tonyred so.Cross reacting rate (%)=(cause 50% concentration that suppresses tonyred/cause the 50% analog concentration that suppresses) * 100%

The specificity of table 6 kit

Medicine name	Cross reacting rate (%)
		Tonyred	100
Para red	120
		No. 2, tonyred	＜1
No. 4, tonyred	＜1

Experimental example 4

The kit preservation condition is 2-8 ℃, and through 6 months mensuration, the maximum absorbance value (zero standard) of kit, 50% inhibition concentration, tonyred were added the practical measurement value all within normal range.Consideration has improper preservation condition and occurs in transportation and use, and kit was placed 6 days under the condition of 37 ℃ of preservations, carries out the accelerated deterioration experiment, and the result shows that the every index of this kit meets the requirements fully.Consider that the freezing situation of kit takes place, kit was put into-20 ℃ of refrigerators freezing 5 days, measurement result shows that also the every index of kit is normal fully.Can draw kit from above result can preserve more than 6 months at least at 2-8 ℃

Claims (9)

1. enzyme linked immunological kit that detects Sudan red medicines is characterized in that it contains:

(1) is coated with the ELISA Plate of tonyred antigen, antibody or antiantibody;

(2) enzyme labeling thing;

(3) tonyred standard solution;

(4) substrate colour developing liquid;

(5) stop buffer;

(6) concentrated cleaning solution;

(7) concentrate redissolution liquid;

(8) tonyred specific antibody concentrate;

(9) concentrated antibody dilution,

When envelope antigen on the ELISA Plate and enzyme labeling thing are also to contain (8) and (9) when bag is enzyme-labelled antigen by antiantibody and enzyme labeling thing on enzyme labeling antiantibody or the ELISA Plate, it is the citrate buffer solution of pH value for 6.60.01～0.03mol/L that wherein used bag is cushioned liquid, and used confining liquid is for containing 0.5% horse serum, 1 ‰ sodium azide and 3% caseic solution.

2. kit as claimed in claim 1 is characterized in that: the enzyme labeling thing is enzyme-labelled antigen, enzymic-labelled antibody or enzyme labeling antiantibody.

3. kit as claimed in claim 1 or 2 is characterized in that: the coating antigen of bag quilt is conjugate, tonyred specific antibody or the antiantibody of tonyred haptens and carrier protein in the ELISA Plate; Described carrier protein is mouse haemocyanin, thyroprotein, bovine serum albumin(BSA), albumin rabbit serum, human serum albumins, ovalbumin or hemocyanin; The tonyred specific antibody is tonyred monoclonal antibody or polyclonal antibody; The monoclonal antibody of the monoclonal hybridoma strain B-1-1CGMCC No.1706 secretion that described tonyred monoclonal antibody is anti-tonyred; Antiantibody is anti-mouse-anti antibody of goat or goat-anti rabbit antiantibody.

4. kit as claimed in claim 1 or 2 is characterized in that: the enzyme labeling thing is enzyme labeling antiantibody, enzyme labeling tonyred haptens or enzyme labeling specific antibody; Wherein antiantibody is sheep anti mouse antiantibody or goat-anti rabbit antiantibody; Marker enzyme is that horseradish peroxidase or bacterium are extracted alkaline phosphatase.

5. kit as claimed in claim 1 or 2, it is characterized in that, marker enzyme is a horseradish peroxidase, and substrate colour developing liquid A liquid is that hydrogen peroxide or urea peroxide, substrate colour developing liquid B liquid are that o-phenylenediamine or tetramethyl benzidine, stop buffer are sulfuric acid or the hydrochloride buffer of 1～2mol/L.

6. kit as claimed in claim 1 or 2 is characterized in that, marker enzyme is that bacterium is extracted alkaline phosphatase, and substrate colour developing liquid is for being the NaOH of 2mol/L to nitro phosphate buffer, stop buffer.

7. kit as claimed in claim 1 or 2 is characterized in that, concentrated cleaning solution is 0.01M, and pH 7.4, contain the phosphate buffer of 0.8%～1.2% polysorbas20 and 0.5% sodium azide antiseptic; The liquid that concentrate to redissolve is 2 * the phosphate buffer of 0.04mol/L; Confining liquid contains the cow's serum of 3-10%, 2% caseic phosphate buffer.

8. kit as claimed in claim 1 or 2 is characterized in that: the concentration of tonyred standard solution is respectively 0 μ g/L, 0.1 μ g/L, 0.4 μ g/L, 1.6 μ g/L, 6.4 μ g/L, 25.6 μ g/L.

9. method that the test sample Sudan red medicines is residual comprises step:

(1) sample pre-treatments;

(2) detect with the described kit of arbitrary claim 1-8;

(3) analyzing and testing result.

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