LXA4 ELISA Kit
LXA4 ELISA Kit
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Product Specification
| Usage | Required experimental equipment: 1. Microplate reader (450nm) 2. High-precision pipettes and pipette tips: 0.5-10uL, 5-50uL, 20-200uL, 200-1000uL 3. 37°C incubator 4. Distilled or deionized water Sample handling and requirements: The detection range of the kit is not equivalent to the concentration range of the analyte in the sample. Before the experiment, it is recommended to estimate the analyte concentration in the sample based on relevant literature and conduct preliminary experiments to determine the actual concentration in the sample. If the analyte concentration in the sample is too high or too low, dilute or concentrate the sample appropriately. If the sample type is not listed in the instructions, it is recommended to conduct a preliminary experiment to verify the validity of the test. Serum: Collect whole blood in a serum separator tube and place it at room temperature for 2 hours or at 2-8°C overnight. Then centrifuge at 1000×g for 20 minutes and remove the supernatant. Alternatively, store the supernatant at -20°C or -80°C, but avoid repeated freezing and thawing. Plasma: Collect the sample using EDTA or heparin as an anticoagulant. Within 30 minutes of collection, centrifuge at 1000×g for 15 minutes at 2-8°C. Remove the supernatant and test it. Alternatively, store the supernatant at -20°C or -80°C, but avoid repeated freezing and thawing. Tissue homogenate: Rinse the tissue with pre-chilled PBS (0.01M, pH 7.4) to remove any residual blood (lysed red blood cells in the homogenate may affect the test results). Weigh the tissue and mince it. Add the minced tissue to the appropriate volume of PBS (generally a 1:9 weight-to-volume ratio, e.g., 1g of tissue sample to 9mL of PBS. The specific volume can be adjusted according to experimental needs and recorded. It is recommended to add protease inhibitors to the PBS) in a glass homogenizer and grind thoroughly on ice or in a homogenizer. To further lyse tissue cells, the homogenate can be sonicated or repeatedly freeze-thawed. Finally, centrifuge the homogenate at 5000×g for 5-10 minutes and remove the supernatant for analysis. Cell culture supernatant: Centrifuge at 1000×g for 20 minutes. Remove the supernatant and analyze it immediately, or store it at -20°C or -80°C, but avoid repeated freeze-thaw cycles. Cell lysis buffer: Gently wash adherent cells with ice-cold PBS, then trypsinize and harvest the cells by centrifugation at 1000×g for 5 minutes. Suspension cells can be harvested directly by centrifugation. Wash the collected cells three times with pre-chilled PBS and resuspend in 150-200 μL of PBS per 1 × 10^6 cells (protease inhibitors are recommended; if the cell count is very low, the PBS volume can be reduced appropriately). Disrupt the cells by repeated freeze-thaw cycles or sonication. Centrifuge the extract at 1500 × g for 10 minutes at 2-8°C, and remove the supernatant for testing. Other biological samples: Centrifuge at 1000 × g for 20 minutes, and remove the supernatant for testing. Sample Appearance: The sample should be clear and transparent, and any suspended matter should be removed by centrifugation. Sample Storage: Samples collected for testing within one week can be stored at 4°C. If testing is not possible, aliquot the sample into single-use aliquots and freeze at -20°C (for testing within one month) or -80°C (for testing within six months). Avoid repeated freeze-thaw cycles. Hemolysis of the sample can affect the final test results, so hemolyzed samples are not suitable for this test. Pre-Assay Preparation: 1. Remove the test kit from the refrigerator 10 minutes in advance and equilibrate to room temperature. 2. Prepare the gradient working solution for the standard: Add 1 mL of universal diluent to the lyophilized standard. Let stand for 15 minutes to completely dissolve, then gently mix (concentration 40 ng/mL). Then dilute to the following concentrations: 40 ng/mL, 20 ng/mL, 10 ng/mL, 5 ng/mL, 2.5 ng/mL, 1.25 ng/mL, 0.625 ng/mL, and 0 ng/mL. Serial dilution method: Add 500 μL of universal diluent to each of seven EP tubes. Pipette 500 μL of the 40 ng/mL standard working solution into the first EP tube and mix thoroughly to make a 20 ng/mL standard working solution. Repeat this procedure for subsequent tubes. The last tube serves as a blank well; there is no need to pipette liquid from the penultimate tube. See the figure below for details. 3. Preparation of HRP-antigen working solution: 15 minutes before use, centrifuge the concentrated HRP-antigen at 1000×g for 1 minute. Dilute 100× concentrated HRP-antigen to a working concentration of 1× with universal diluent (e.g., 10 μL concentrate + 990 μL universal diluent). Prepare and use immediately. 4. Prepare 1× Wash Buffer: Dissolve 10 mL of 20× Wash Buffer in 190 mL of distilled water. (Concentrated Wash Buffer removed from the refrigerator may crystallize, which is normal. Allow to stand at room temperature until the crystals have completely dissolved before preparing.) Procedure: 1. Remove the desired strips from the aluminum foil bag after equilibration at room temperature for 10 minutes. Seal the remaining strips in a ziplock bag and return them to 4°C. 2. Sample Addition: Add 50 μL of sample or standard of varying concentrations to the corresponding wells. Add 50 μL of Universal Diluent to the blank wells, followed by 50 μL of HRP-Antigen Working Solution to each well. Cover with film and incubate at 37°C for 60 minutes. (Recommendation: Dilute the test sample at least 1x with universal diluent before adding it to the ELISA plate for testing. This will minimize the impact of matrix effects on the test results. The final calculation of sample concentration should be multiplied by the corresponding dilution factor. It is recommended to set up duplicate wells for all test samples and standards.) 3. Wash: Discard the liquid and add 300uL of 1x wash buffer to each well. Let it stand for 1 minute. Shake off the wash buffer and pat dry on absorbent paper. Repeat this process three times (a microplate washer can also be used). 4. Add substrate: Add 90uL of substrate (TMB) to each well, cover with sealing film, and incubate at 37°C in the dark for 15 minutes. 7. Add stop solution: Remove the ELISA plate and add 50uL of stop solution directly to each well. Immediately measure the OD value of each well at a wavelength of 450nm. Calculation of Experimental Results: Result Interpretation: 1. Calculate the average OD value of the standard and sample replicates and subtract the OD value of the blank well as the correction value. Plot the standard curve of the four-parameter logistic function on double-logarithmic graph paper, with concentration as the horizontal axis and OD value as the vertical axis. 2. If the sample OD value is higher than the upper limit of the standard curve, dilute it appropriately and retest. Multiply the sample concentration by the corresponding dilution factor when calculating the sample concentration. 
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| Sensitivity | 0.34 ng/mL | |||||||||||||||||||||||||||||
| Theory | This kit uses a competitive enzyme-linked immunosorbent assay (ELISA). Samples, standards, and HRP-labeled antigens are sequentially added to microwells pre-coated with lipoxin A4 (LXA4) antibodies. After incubation and washing, the samples are developed using the substrate TMB. TMB is converted to blue by HRP peroxidase and to yellow by acid. The intensity of the color is negatively correlated with the amount of lipoxin A4 (LXA4) in the sample. The absorbance (OD) is measured at 450 nm using a microplate reader to calculate the sample concentration. | |||||||||||||||||||||||||||||
| Source | All | |||||||||||||||||||||||||||||
| Synonym | Lipoxin A4 ELISA Kit | |||||||||||||||||||||||||||||
| Detection Type | Competition Law | |||||||||||||||||||||||||||||
| Composition |
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| Background | Lipoxygenases (LXs), an acronym for lipoxygenase interaction products, are bioactive autometabolites of arachidonic acid produced by various cell types. They are classified as members of a family of specialized pro-resolving mediators of non-classical eicosanoids and polyunsaturated fatty acid metabolites. Like other SPMs, LXs are formed during inflammatory responses and then act to resolve them. LXA4 and aspirin-triggered LXATL are endogenous lipids that regulate leukocyte trafficking and mediate anti-inflammatory and resolution effects through specific LXA4 receptors (ALXRs). They are a lipokine, a long-chain fatty acid, and a hydroxypolyunsaturated fatty acid. They are the conjugated acid of lipokine A4(1-). | |||||||||||||||||||||||||||||
| General Notes | 1. Strictly adhere to the specified incubation time and temperature to ensure accurate results. All reagents must be at room temperature (20-25°C) before use. Refrigerate reagents immediately after use. 2. Improper plate washing may result in inaccurate results. Ensure that all liquid in the wells is aspirated thoroughly before adding substrate. Do not allow the wells to dry out during incubation. 3. Remove any residual liquid and fingerprints from the bottom of the plate, as this will affect the OD value. 4. The substrate developer solution should be colorless or very light in color. Do not use substrate solution that has turned blue. 5. Avoid cross-contamination of reagents and specimens to prevent erroneous results. 6. Avoid direct exposure to strong light during storage and incubation. 7. Do not expose any reagents to bleaching solvents or the strong fumes emitted by bleaching solvents. Any bleaching agent will destroy the biological activity of the reagents in the kit. 8. Do not use expired products, and do not mix components with different product numbers and batches. 9. Recombinant proteins from sources other than the kit may not be compatible with the antibodies in this kit and will not be recognized. 10. If there is a possibility of disease transmission, all samples should be managed properly and samples and testing devices should be handled according to prescribed procedures. |
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| Storage Temp. | If the unopened kit is stored at 4°C, the shelf life is 6 months. | |||||||||||||||||||||||||||||
| Test Range | 0.62-40 ng/mL | |||||||||||||||||||||||||||||
| Applications | Serum, plasma, tissue homogenate, cell culture supernatant and other biological fluids |
