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Human insulin-like growth factor binding protein-4 (IGFBP4) ELISA kit instruction manual
Human insulin-like growth factor binding protein -4 (IGFBP4) ELISA kit
 ( for serum, plasma, cell culture supernatant and urine, saliva biological fluid )
principle
This experiment used double antibody sandwich ABC-ELISA. The anti-human IGFBP4 monoclonal antibody was coated on the plate, the IGFBP4 in the standard and the sample was combined with the monoclonal antibody, and biotinylated anti-human IGFBP4 was added to form an immune complex attached to the plate, horseradish peroxidase. The labeled Streptavidin is combined with biotin, and the substrate working solution is blue. Finally, the stop solution sulfuric acid is added, and the OD value is measured at 450 nm. The IGFBP4 concentration is directly proportional to the OD value, and the concentration of IGFBP4 in the sample can be obtained by drawing a standard curve.
Kit composition ( 2-8 ° C preservation)
Coated Wells
96 holes
Enzyme Conjugate
12ml
10× specimen dilution (Sample Buffer)
12ml
20×Wash Buffer
50ml
Standards: 2000ng/bottle
2 bottles
Substrate working fluid (TMB Solution)
12ml
Primary antibody working solution (Biotinylated Antibody)
12ml
Stop Solution
12ml
Prepare reagents and collect blood samples
1. Collection of specimens: serum, plasma (heparin anticoagulation), cell culture supernatant, urine, saliva, etc., as soon as possible, stored at 2-8 ° C for 48 hours; longer time must be frozen (-20 °C or -70 °C) Save to avoid repeated freezing and thawing. With sample dilution is at least 1 serum or plasma assay: 50 dilution (take 20ul, sample plus diluent 980ul, diluted 50-fold).
2. Standard solution preparation: Add 0.5ml of distilled water before use and mix well to form a 4000ng/ml solution. Set 8 tubes of standard tube, and add 200 ul of standard dilution solution to each tube. Add 4000 ng of the standard solution of 4000 ng/ml to the first tube, mix and aspirate 200 ul with the sampler, and transfer to the second tube. Repeat the dilution as described above, and aspirate 200 ul from the seventh tube and discard it. The eighth tube is a blank control.
3. The 10× specimen dilution was diluted 1:10 with distilled water (example: 1 ml concentrated dilution + 9 ml distilled water).
4. Washing solution: diluted 1:20 with distilled water (example: 1 ml concentrated washing solution added to 19 ml of distilled water)
Test procedure
1. Loading: Add 100 ul of standard or sample to be tested in each well. Mix the reaction plate thoroughly and let it stand at 37 °C for 120 minutes.
2. Wash the plate: Wash the plate thoroughly with washing solution 4-6 times, and dry it on the filter paper.
3. Add 100 ul of the first antibody working solution to each well. The reaction plate was thoroughly mixed and placed at 37 ° C for 60 minutes.
4. Wash the board: the same as before.
5. Add 100 ul of enzyme-labeled antibody working solution per well. The reaction plate was placed at 37 ° C for 30 minutes.
6. Wash the board: same as before.
7. Add 100 ul of substrate working solution per well, set 37 The reaction was carried out in the dark at °C for 15 minutes.
8. Add 100 ul of stop solution to each well and mix.
9. Measure the absorbance at 450 nm using a microplate reader within 30 minutes.
Result calculation and judgment
1. All OD values ​​should be subtracted from the blank value before calculation.
2. Using standard products 2000, 1000, 500, 250, 125, 62.5, 31.2, 0 ng/ml as the abscissa and OD as the ordinate, plot on the coordinate paper and draw the standard curve.
3. According to the OD value of the sample, find the corresponding IGFBP4 content on the graph, and then multiply the dilution factor.
Kit performance
1. Sensitivity: The minimum IGFBP4 detection concentration is less than 15 ng/ml.
2. Specificity: Recombinant or natural human IGFBP4 can be detected simultaneously. Does not cross-react with other human cytokines.
3. Repeatability: The coefficient of variation in both the plate and the plate is less than 10%.
Precautions
1. It is recommended to make double holes for the above standard holes and samples to be tested. The standard curve should be made at the same time for each measurement.
2. The washing process is critical. Insufficient washing will result in an accuracy error and an erroneous rise in the OD value.
3. After the slats are opened, the remaining slats should be sealed again to keep the slats dry .
4. This kit should be stored in a 4 o C refrigerator.
5. This kit is for scientific research only and cannot be used for clinical diagnosis!