This kit is for research use only
Detection range: 0.05 pmol / ml-1 pmol / ml
Specificity: This kit can detect natural or recombinant human EPI at the same time, and there is no cross reaction with other related substances.
Validity: 6 months Expected application: ELISA method for quantitative determination of EPI content in human serum, plasma or other related biological fluids.
Explanation
1. Kit storage: -20 ℃ (when not in use for a long time); 2-8 ℃ (when used frequently).
2. The concentrated washing liquid will be salted out at low temperature, and it can be heated and dissolved in the water bath when diluted.
3. There may be inconsistencies between the Chinese and English instructions. Please refer to the English instructions.
4. The well of the ELISA plate just opened may contain a little water-like substance. This is normal and will not have any impact on the experimental results.
Experimental principle Microporous plates are coated with purified antibody to make a solid-phase carrier. Specimens or standards and another HRP-labeled monoclonal antibody are added to the antibody-coated microwells in turn. color. The color depth is positively correlated with the EPI in the sample. The absorbance (OD value) was measured with a microplate reader at a wavelength of 450 nm, and the sample concentration was calculated.
Kit composition and reagent preparation
1. Assay plate: one piece (96 wells).
2. Standard (Standard): 4 bottles (lyophilized product).
Standard S1 S2 S3 S4
Concentration (pmol / ml) 0.05 0.2 0.45 1
3. Enzyme conjugate (HRP-conjugate): 1 × 6ml / bottle.
4. Substrate A: 1 × 7ml / bottle.
5. Substrate B: 1 × 7ml / bottle.
6. Wash Buffer: 1 × 15ml / bottle, each bottle is diluted 20 times with distilled water.
7. Stop Solution (Stop Solution): 1 × 7ml / bottle (2N H2SO4).
Reagents and equipment needed but not provided
1. Standard Specification Microplate Reader
2. High-speed centrifuge
3. Electric heating thermostat incubator
4. Clean test tubes and Eppendof tubes
5. Series adjustable pipettes and tips. When testing more samples at one time, it is best to use multi-channel pipettes
6. Collection and preservation of specimens such as distilled water and volumetric flasks
1. Serum: Whole blood specimens should be left at room temperature for 2 hours or overnight at 4 ° C and centrifuged at 1000g for 20 minutes. The supernatant can be taken for detection, or the specimens should be stored at -20 ° C or -80 ° C, but repeated freezing should be avoided melt.
2. Plasma: EDTA or heparin can be used as an anticoagulant. Centrifuge the sample at 1000g at 2-8 ° C for 15 minutes within 30 minutes after collection, or store the specimen at -20 ℃ or -80 ℃, but avoid repeated freezing. melt.
3. Cell culture supernatant or other biological specimens: centrifuge at 1000g for 20 minutes, take the supernatant for detection, or store the specimen at -20 ℃ or -80 ℃, but avoid repeated freezing and thawing.
Note: Hemolysis of specimens will affect the final test results, so hemolysis specimens should not be tested.
Dilution principle of specimens:
First of all, we should know the approximate content of the sample to be tested through literature search, and determine the appropriate dilution factor. Only when it is diluted to the range of the standard curve, the test result is accurate. Detailed records should be made during the dilution process. When calculating the concentration at the end, it was diluted "N" times, and the concentration of the specimen should be multiplied by "N".
Standard dilution principle: 4 bottles, each bottle is diluted with distilled water to 0.5ml before use. After capping, let stand for more than 10 minutes, and then invert / rub repeatedly to help dissolve.
Before starting the experiment, please configure all reagents in advance. When diluting the reagents or samples, they should be mixed evenly. Try to avoid foaming when mixing. A standard curve should be made for each test. If the sample concentration is too high, dilute it first so that the sample conforms to the detection range of the kit.
1. Add sample: set blank hole, standard hole and sample hole to be tested respectively. No solution is added to the blank well, and 50μl of the standard or the sample to be tested is added to the remaining well. Be careful not to have air bubbles. Add the sample to the bottom of the well of the microtiter plate as much as possible.
2. Add 50μl of enzyme conjugate to each well (except the blank well), mix well, 37 ° C, 120 minutes.
3. After incubation, discard the liquid in the wells, spin dry, wash the plate 3 times, soak for 1-2 minutes each time, 200μl / well, spin dry.
4. Add 50μl of substrate solution A and B to each well in sequence, and avoid color development at 37 ℃. If the color of the hole is not obvious, it can be terminated).
5. Add 50μl of stop solution to each well in sequence to stop the reaction (in this case, the blue color turns to yellow). The order of adding the stop solution should be the same as that of the substrate solution. In order to ensure the accuracy of the experimental results, the termination solution should be added as soon as possible after the substrate reaction time expires.
6. Measure the optical density (OD value) of each well in sequence using an enzyme-linked instrument at a wavelength of 450 nm. Test within 15 minutes after adding stop solution.
Note:
1. When using the reagent kit for the first time, the user should centrifuge various reagent tubes for several minutes so that the reagents are concentrated to the bottom of the tube.
2. Leave one well for each experiment as a blank zero-adjusting well. No reagents are added to this well, only the substrate solution and 2N H2SO4 are added at the end. Use this hole to adjust the OD value to zero when measuring.
3. To prevent the sample from evaporating, place the reaction plate in a closed box covered with a damp cloth during the test, and add a cover or film to the enzyme label plate.
4. Store unused microplates or reagents at 2-8 ° C.
5. It is recommended to set double-hole measurement when testing samples to ensure the accuracy of the test results.
Plate washing method Manual plate washing method: suck (not touch the wall) or shake off the liquid in the microplate; put a few layers of absorbent paper on the experimental table, and tap the microplate down several times with force; the recommended wash buffer Inject at least 0.3ml of solution into the hole and soak for 1-2 minutes. Repeat this process several times as needed.
Automatic plate washing: If there is an automatic plate washing machine, it should be used in the formal experiment process after being used skillfully.
Calculate the standard concentration as the abscissa (logarithmic coordinate), the OD value is the ordinate (ordinary coordinate), draw a standard curve on the semi-logarithmic coordinate paper, and find the corresponding concentration from the standard curve according to the OD value of the sample ; Multiply by the dilution factor; or use the standard concentration and OD value to calculate the linear regression equation of the standard curve, substitute the OD value of the sample into the equation, calculate the sample concentration, and multiply by the dilution factor, which is the actual concentration of the sample .
Precautions
1. When mixing protein solutions, try to be as gentle as possible to avoid foaming.
2. The washing process is very important. Insufficient washing can easily cause false positives.
3. 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 the standard curve at the same time of each measurement, it is better to make the complex hole.
5. If the content of the substance to be tested in the specimen is too high, please dilute it and then determine it. When calculating, please multiply by the dilution factor.
6. Please keep the substrate away from light.
7. Do not replace the reagents in the kit with reagents from other manufacturers.
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