Human insulin-like growth factor binding protein -2 (IGF-BP2) ELISA kit
 ( used in serum, plasma, cell culture supernatants and other biological fluids )
principle
This experiment used double antibody sandwich ABC-ELISA. The anti-human IGF-BP2 monoclonal antibody was coated on the microtiter plate, the IGF-BP2 in the standard and the sample was combined with the monoclonal antibody, and biotinylated anti-human IGF-BP2 was added to form an immune complex attached to the plate. Horseradish peroxidase-labeled Streptavidin is combined with biotin, the substrate working solution is blue, and finally the stop solution sulfuric acid is added. The OD value is measured at 450 nm. The IGF-BP2 concentration is directly proportional to the OD value, which can be drawn by standard. The curve was used to determine the concentration of IGF-BP2 in the specimen.
Kit composition ( 2-8 ° C preservation)
Coated Wells | 96 holes | Enzyme Conjugate | 12ml |
10× specimen dilution (Sample Buffer) | 12ml | 20×Wash Buffer | 50ml |
Standards: 240ng / 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. Collect specimens: serum, plasma (EDTA), cell culture supernatant, tissue homogenate, etc., as soon as possible, store at 2-8 ° C for 48 hours; longer time must be frozen (-20 °C or -70 °C) Save to avoid repeated freezing and thawing. Ascites was diluted 1:10000 times. Urine, saliva, bronchial fluid, and cell culture supernatant were diluted 1:5. Serum and plasma should be diluted at least 1:20.
2. Standard solution preparation: Add 0.3ml of distilled water before use and mix well to prepare 800ng/ml solution. Set 8 tubes of standard tubes, and add 300 ul of standard dilution solution to each tube. Add 800 ng of standard solution of 800 ng/ml to the first tube, mix and aspirate 300 ul with a sampler, and transfer to a second tube. Repeat the dilution in this way, and remove 300 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. Take the standard products 400, 200, 100, 50, 25, 12.5, 6.25, 0 ng/ml as the abscissa and OD as the ordinate. Draw on the coordinate paper and draw the standard curve.
3. According to the OD value of the sample, find the corresponding IGF-BP2 content on the graph, and then multiply the dilution factor.
Kit performance
1. Sensitivity: The minimum IGF-BP2 detection concentration is less than 3 ng/ml.
2. Specificity: Recombinant or natural human IGF-BP2 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!
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