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Human soluble CD30 molecule (sCD30) 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 sCD30 mAb was coated on the microtiter plate, the sCD30 in the standard and the sample was combined with the mAb, and biotinylated anti-human sCD30 was added to form an immune complex attached to the plate, horseradish peroxidase The 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, and the sCD30 concentration is directly proportional to the OD value. The concentration of sCD30 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: 20ng/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. Serum and plasma should be diluted at least 1 : 100 (take 10 ul, add 990 ul of dilution, 100 times diluted), dilute the urine 2 times (take 100 ul, add 100 ul of the diluted solution, dilute 2 times) and test. The cell culture supernatant can be directly detected without dilution.
2. Standard standard solution: Add 1ml of distilled water before use and mix to form a 20ng/ml solution. Set the standard tube 8 tube, the first tube plus the standard dilution 900ul, the second to the eighth tube to add the sample dilution 500ul. Add 100 ul of 20 ng/ml standard solution to the first tube, mix and aspirate 500 ul with the sampler, and transfer to the second tube. Repeat the dilution as described above, and remove 500 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 to each well and let it react at 37 ° C for 15 minutes in the dark.
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 2000, 1000, 500, 250, 125, 62.5, 31.2, 0 pg/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 sCD30 content on the graph, and then multiply the dilution factor.
Kit performance
1. Sensitivity: The minimum sCD30 detection concentration is less than 15pg/ml.
2. Specificity: Recombinant or natural human sCD30 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 4oC refrigerator.
5. This kit is for scientific research only and cannot be used for clinical diagnosis!