Rat CD4 molecule (CD4) enzyme-linked immunoassay (ELISA) kit instructions for use This kit is for research use only. Drug name: Generic name: Rat CD4 molecule (CD4) enzyme-linked immunoassay kit Purpose: This kit is used to determine the content of CD4 molecule (CD4) in rat serum, plasma and related liquid samples. Experimental principle The kit uses the double antibody sandwich method to determine the level of rat CD4 molecule (CD4) in the specimen. The microplate is coated with purified rat CD4 molecule (CD4) antibody to make a solid-phase antibody. The CD4 molecule (CD4) is added to the monoclonal antibody-coated microwells in turn, and then combined with the HRP-labeled CD4 antibody to form the antibody -Antigen-enzyme labeled antibody complex, after thorough washing, add substrate TMB to develop color. TMB is converted into blue under the catalysis of HRP enzyme, and into the final yellow under the action of acid. The color depth is positively correlated with the CD4 molecule (CD4) in the sample. The absorbance (OD value) was measured with a microplate reader at a wavelength of 450 nm, and the concentration of rat CD4 molecule (CD4) in the sample was calculated by a standard curve. Kit composition 1 20 times concentrated washing solution 30ml × 1 bottle 7 stop solution 6ml × 1 bottle 2 enzyme label reagent 6ml × 1 bottle 8 standard product (13.5U / ml) 0.5ml × 1 bottle 3 enzyme label coated plate 12 wells × 8 strips 9 standard diluent 1.5ml × 1 bottle 4 sample diluent 6ml × 1 bottle 10 instruction manual 1 copy 5 developer A solution 6ml × 1 bottle 11 sealing film 2 sheets 6 developer B solution 6ml × 1 / Bottle 12 Sealed bag 1 specimen requirement 1. Specimens are extracted as soon as possible after collection, and extraction is performed according to relevant literature, and experiments should be conducted as soon as possible after extraction. If the test cannot be performed immediately, the specimen can be stored at -20 ℃, but repeated freezing and thawing should be avoided. The samples containing NaN3 cannot be detected because NaN3 inhibits horseradish peroxidase (HRP) activity. Procedure 1. Dilution and loading of standard products: set 10 standard wells on the enzyme-coated plate, add 100 μl of standard products in the first and second wells, and then add in the first and second wells. 50μl of standard diluent, mix well; then take 100μl from the first well and the second well respectively to the third and fourth wells, then add 50μl of standard diluent to the third and fourth wells respectively, mix Evenly; then take 50μl each in the third and fourth wells and discard, then add 50μl each to the fifth and sixth wells, and then add 50ul of standard dilution solution to the fifth and sixth wells respectively, mix After mixing, take 50μl from the fifth and sixth wells and add them to the seventh and eighth wells respectively. Then add 50μl of the standard dilution solution to the seventh and eighth wells respectively. Take 50μl from the eighth well to the ninth and tenth wells, and then add 50μl of the standard dilution solution to the ninth and tenth wells respectively. After mixing, take 50μl from the ninth and tenth wells and discard. (After dilution, the volume of each well is 50μl, and the concentration is 9U / ml, 6U / ml, 3U / ml, 1.5U / ml, 0.75U / ml). 2. Add samples: set up blank wells (the blank control wells do not add samples and enzyme reagents, the rest of the steps are the same) and the sample wells to be tested. Add 40μl of sample diluent to the test sample well of the enzyme-coated plate, and then add 10μl of the sample to be tested (the final dilution of the sample is 5 times). Add the sample and add the sample to the bottom of the well of the microplate, try not to touch the wall of the well, shake gently to mix. 3. Incubation: Seal the plate with a sealing plate and incubate at 37 ° C for 30 minutes. 4. Mixing solution: dilute 20-fold concentrated washing solution with distilled water 20-fold and reserve for use 5. Washing: carefully peel off the sealing film, discard the liquid, spin dry, fill each well with the washing solution, and let it sit for 30 seconds , Repeat this 5 times, pat dry. 6. Add enzyme: add 50μl of enzyme label reagent to each well, except blank well. 7. Incubation: The operation is the same as 3. 8. Washing: The operation is the same as 5. 9. Color development: add 50μl of developer A to each well, then add 50μl of developer B, mix gently, and develop color at 37 ° C in the dark 15 minutes. 10. Stop: Add 50μl of stop solution to each well to stop the reaction (the blue color turns to yellow at this time). 11. Determination: Measure the absorbance (OD value) of each well in sequence with the blank air conditioner at zero and 450 nm wavelength. The measurement should be carried out within 15 minutes after adding the stop solution. Calculate the standard concentration as the abscissa and the OD value as the ordinate. Draw a standard curve on the coordinate paper, and find the corresponding concentration from the standard curve according to the OD value of the sample; multiply by the dilution factor; The linear regression equation of the standard curve is calculated from the concentration and the OD value, the OD value of the sample is substituted into the equation, the sample concentration is calculated, and then multiplied by the dilution factor, which is the actual concentration of the sample. Matters needing attention 1. The kit should be equilibrated at room temperature for 15-30 minutes before being taken out of the refrigerated environment. If the enzyme label coated plate is unopened, the strip should be stored in a sealed bag. 2. Crystals may be precipitated in the concentrated washing liquid, which can be heated and dissolved in a water bath during dilution, and the results will not be affected during washing. 3. The sampler should be used at each step of sample addition, and the accuracy should be regularly checked to avoid test errors. It is best to control the sampling time within 5 minutes. If there are many specimens, it is recommended to use a volley gun to add samples. 4. Please make a standard curve at the same time of each measurement, it is best to make a double hole. If the content of the test substance in the specimen is too high (the OD value of the sample is greater than the OD value of the first well of the standard well), please first dilute it with a certain multiple (n times) of the sample diluent and then determine it. When calculating, please multiply the total dilution Multiple (× n × 5). 5. The sealing film is limited to one-time use to avoid cross-contamination. 6. Please keep the substrate away from light. 7. Strictly follow the instructions, and the test results must be determined based on the reading of the microplate reader. 8. All samples, washing liquids and various wastes should be treated as infectious agents. 9. The components of different batches of this reagent shall not be mixed. 10. If it is different from the English manual, the English manual shall prevail. Detection range: 0.3U / ml -12U / ml Specification: 96 servings / box storage conditions and expiration date Kit storage :; 2-8 ℃. 2. Validity: 6 months Shanghai Youteng Biological Technology Co., Ltd. is a professional biological reagent sales company.