We supply many types of Brass Radiator Valves and brass Exhaust Valves. Commonly, we make NPT thread for America customers, make BSP or BSPT thread for Europe and Asia customers. Our products is produced by CNC machine.
Size 1/4'' to 2'', all bodied and caps are produced by forge technics.
Size 21/2'' to 4'', they are made by casting technics.
Working pressure: 16Bar-25Bar( 150#WSP, 600WOG).
Material: C37700, MS58(CuZn40Pb2), CuZn39Pb3, CW602N.
Product surface can select plated nickel or chrome.
Brass Radiator and Exhaust Valves Brass Radiator Valves,Radiator Valves,Exhaust Valves,Brass Exhaust Valves,Thermostatic Radiator Valves NINGBO YINZHOU PLUMBING HARDWARE CO.,LTD , https://www.brassvalve-china.com
Shanghai Xitang Biotechnology Co., Ltd. 021-55229872, 65333639
Rat dipeptidyl peptidase IV (DPP-4) ELISA kit instruction manual
 ( used in serum, plasma, cell culture supernatants and other biological fluids )
principle
This experiment used double antibody sandwich ABC-ELISA. The anti-rat DPP-4 monoclonal antibody was coated on the plate, the DPP-4 in the standard and the sample was combined with the monoclonal antibody, and biotinylated anti-rat DPP-4 was added to form an immune complex attached to the plate. On the horseradish peroxidase-labeled Streptavidin combined with biotin, the substrate working solution is blue, and finally the stop solution sulfuric acid is added, and the OD value is measured at 450 nm. The DPP-4 concentration is proportional to the OD value, and can be passed. Draw a standard curve to determine the concentration of DPP-4 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: 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. 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. Serum and plasma were diluted 1 : 5 (take 50 ul, add 200 ul of the diluted solution, and dilute 5 times).
2. Standard solution preparation: Add 1ml of distilled water before use and mix well to form 2000ng/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 2000 ng/ml standard solution to the first tube, mix and aspirate 500 ul with a pipette, 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 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 200, 100, 50, 25, 12.5, 6.25, 3.12, 0 ng/ml as the abscissa and OD as the ordinate, plot on the coordinate paper and draw the standard curve.
3. Find the corresponding DPP-4 content on the graph based on the OD value of the sample and multiply by the dilution factor.
Kit performance
1. Sensitivity: The minimum DPP-4 detection concentration is less than 1.6 ng/ml.
2. Specificity: Recombinant or natural rat DPP-4 can be detected simultaneously. Does not cross-react with other cytokines in rats.
3. Repeatability: The coefficient of variation in the plate and plate is less than 9.7%.
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!