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Description
ET ELISA KitProduct Specification Usage Experimental equipment required for the experiment: 1. Microplate reader (450nm) 2. High precision pipette and gun tips: 0. 5 10uL, 5 50uL, 20 200uL, 200 1000uL 3. 37 constant temperature box 4. Distilled water or deionized water Sample processing and requirements: Serum: Place the whole blood sample collected in the serum separation tube at room temperature for 2 hours or at 4 overnight, then centrifuge at 1000g for 20
Product Specification
| Usage |
Experimental equipment required for the experiment: 1. Microplate reader (450nm) 2. High-precision pipette and gun tips: 0.5-10uL, 5-50uL, 20-200uL, 200-1000uL 3. 37℃ constant temperature box 4. Distilled water or deionized water Sample processing and requirements: Serum: Place the whole blood sample collected in the serum separation tube at room temperature for 2 hours or at 4℃ overnight, then centrifuge at 1000×g for 20 minutes, and take the supernatant, or store the supernatant at -20℃ or -80℃, but avoid repeated freezing and thawing. Plasma: Collect the specimen using EDTA or heparin as an anticoagulant and centrifuge at 1000 × g for 15 minutes at 2-8°C within 30 minutes of collection. The supernatant can be assayed or stored at -20°C or -80°C, but avoid repeated freezing and thawing. Cell Supernatant: Rinse the tissue with pre-chilled PBS (0.01M, pH 7.4) to remove residual blood (lysed red blood cells in the homogenate will affect the measurement results). Weigh and mince the tissue. Add the minced tissue to the appropriate volume of PBS (generally a 1:9 weight-to-volume ratio, e.g., 1 g of tissue sample to 9 mL 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. To further lyse the tissue cells, the homogenate can be sonicated or repeatedly frozen and thawed. Finally, centrifuge the homogenate at 5000 × g for 5-10 minutes, and the supernatant can be assayed. Preparation before testing: 1. Remove the test kit from the refrigerator 10 minutes in advance and equilibrate to room temperature. 2. Prepare the gradient working solution of the standard: Add 1 mL of universal diluent to the lyophilized standard, let it stand for 15 minutes to completely dissolve, and then gently mix (concentration is 100 pg/mL). Then dilute to the following concentrations: 100 pg/mL, 50 pg/mL, 25 pg/mL, 12.5 pg/mL, 6.25 pg/mL, 3.125 pg/mL, 1.5625 pg/mL, and 0 pg/mL. Serial dilution method: Take 7 EP tubes and add 500 μL of universal diluent to each tube. Pipette 500 μL of the 100 pg/mL standard working solution into the first EP tube and mix thoroughly to make a 50 pg/mL standard working solution. Repeat this procedure for subsequent tubes. The last tube serves directly as a blank well; there is no need to aspirate from the penultimate tube. See the figure below for details. 3. Preparation of Biotin-Antibody Working Solution: 15 minutes before use, centrifuge the concentrated Biotin-Antibody at 1000×g for 1 minute. Dilute the 100× concentrated Biotin-Antibody to a 1× working concentration with universal diluent (e.g., 10µL concentrate + 990µL universal diluent). Use the same day. 4. Preparation of Enzyme Conjugate Working Solution: 15 minutes before use, centrifuge the 100x concentrated enzyme conjugate at 1000×g for 1 minute. Dilute the 100x concentrated HRP enzyme conjugate to a 1x working concentration with universal diluent (e.g., 10µL concentrate + 990µL universal diluent). Use the same day. 5. Preparation of 1x Wash Solution: Dispense 10mL of 20x Wash Solution into 190mL of distilled water (Concentrated Wash Solution removed from the refrigerator may crystallize; this 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 Biotin-Antibody Working Solution to each well. Cover with film and incubate at 37°C for 1 hour. (Recommendation: Dilute the sample to be tested at least 1-fold with universal diluent before adding it to the ELISA plate to minimize matrix effects. The sample concentration should be multiplied by the dilution factor when calculating the final concentration. It is recommended to run replicates for all samples and standards.) 3. Plate Wash: Discard the liquid and add 300 μL of 1x Wash Solution to each well. Let stand for 1 minute, then shake off the wash solution and pat dry on absorbent paper. Repeat this process three times (a plate washer can also be used). 4. Enzyme Conjugate Working Solution: Add 100 μL of enzyme conjugate working solution to each well. Cover with film and incubate at 37°C for 30 minutes. 5. Wash: Discard the liquid and wash the plate five times as in step 3. 6. Add substrate: Add 90 μL of substrate (TMB) to each well, cover with a sealing film, and incubate at 37°C in the dark for 15 minutes. 7. Add stop solution: Remove the ELISA plate and add 50 μL of stop solution directly to each well. Immediately measure the OD value of each well at a wavelength of 450 nm. Calculation of experimental results: Result evaluation: 1. Calculate the average OD value of the standard and sample replicates and subtract the OD value of the blank well as a correction value. Plot a standard curve for 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 the sample appropriately and retest. Multiply the sample concentration by the corresponding dilution factor. |
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| Theory | This kit uses a competitive enzyme-linked immunosorbent assay (ELISA). Sample, standard, biotin-labeled antibody, and HRP conjugate are sequentially added to microwells pre-coated with a universal endothelin (ET) antigen. After incubation and washing, the assay is developed using the substrate TMB. TMB converts to blue under the catalysis of HRP and to yellow under the action of acid. The intensity of the color is positively correlated with the universal endothelin (ET) content in the sample. The absorbance (OD) is measured at 450 nm using a microplate reader to calculate the sample concentration. | |||||||||||||||||||||||||||||||||
| Source | All | |||||||||||||||||||||||||||||||||
| Synonym | Endothelin ELISA Kit | |||||||||||||||||||||||||||||||||
| Detection Type | Competition Law | |||||||||||||||||||||||||||||||||
| Composition |
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| Background | Endothelin (ET) is a polypeptide with receptors and actions in many organs of the body. Endothelin constricts blood vessels and increases blood pressure. While normally maintained in balance by other mechanisms, when overexpressed, it can lead to hypertension (high blood pressure), heart disease, and potentially other conditions. It is a 21-amino acid vasoconstrictor peptide produced primarily in endothelial cells and plays a key role in vascular homeostasis. Endothelin has been linked to vascular diseases in several organ systems, including the heart, lungs, kidneys, and brain. | |||||||||||||||||||||||||||||||||
| 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 | 1.56-100pg/mL | |||||||||||||||||||||||||||||||||
| Applications | Serum, plasma, cell supernatant, tissue homogenate, etc. |
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4.0 ★★★★★
Based on 6 reviews
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Product Reviews
★★★★★ 5
Good buy
Color: Pathways Design, Size: 10 in
Very very strong and sturdy
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 17, 2026
★★★★★ 5
Great price
Color: Pathways Design, Size: 10 in
Perfect size & love the price for what we get!
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Reviewed in the United States on February 14, 2026
★★★★★ 5
Great small soup bowls!
I bought these for a family party for soup. I was nervous they were going to be flimsy and cheap. I was pleasantly surprised how thick and sturdy they are! They were a perfect size for a smaller bowl of soup or chili. We even used them in the microwave for left overs and they held up great! There was no sagging or getting soggy which I was also worried about. They are definitely good quality. They are much better than the Walmart or cheap off brands. I also loved the price. I thought they were a great deal for the quality and quantity. The only con I had was some were hard to pull apart. It was no big deal though. I will definitely buy them again.
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Reviewed in the United States on November 4, 2025
★★★★★ 5
I Put 2 Raw Eggs in This Paper Bowl… (Video Included)
These paper bowls are smaller than standard size, and that’s actually exactly why I buy them. They’re perfect for kids’ snacks and portion control without overfilling or wasting food.
I was pleasantly surprised by how sturdy they are. These do not crumple easily like cheaper paper bowls, and they hold their shape well even when handled by kids throughout the day. We regularly use them for dry snacks like Goldfish crackers, cereal, and cookies, and a single bowl can last all afternoon through multiple refills.
They are also leak-resistant, which I tested more aggressively than most people probably would. I cracked two raw eggs into one bowl, swirled them around, and set a timer. After a minute, I it held up (over my head) without it bending or collapsing. That alone sold me on the durability. The end result - no leaks. Zero.
For the price, quality is excellent. If you’re looking for smaller bowls for snacks, portion control, these are a solid choice.
These aren’t your typical flimsy paper bowls — they’re surprisingly durable for everyday use. Kitchen Chaos Tested™ — and they passed.
⭐️I included a video of paper bowls vs raw eggs, plus some photos for size reference
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Reviewed in the United States on April 18, 2026
★★★★★ 5
Sturdy and useful
Good plates, we used them all and had no spills or plate disasters. We used them for hot and cold food. Sturdy and saves me time on dishes! I also appreciate that they look nice even if it isn't for company. Great for draining bacon with a paper towel. So much easier. Also, from my home schooling days, these are great for kids when they want to paint. Holds the paint and it is somewhere to lay your brushes.
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Reviewed in the United States on March 31, 2026