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Description
Human TCF7L2 ELISA KitProduct 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. 37C incubator 4. Distilled or deionized water Sample preparation and requirements: Tissue homogenization: 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
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 preparation and requirements: Tissue homogenization: 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., 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. To further lyse tissue cells, the homogenate can be sonicated or repeatedly frozen and thawed. Finally, centrifuge the homogenate at 5000×g for 5-10 minutes, and collect the supernatant for analysis. Cell Lysis Buffer: Adherent cells should be gently washed with pre-chilled PBS, then trypsinized and harvested by centrifugation at 1000×g for 5 minutes. Suspension cells can be harvested directly by centrifugation. Collected cells should be washed three times with pre-chilled PBS and resuspended in 150-200 μL of PBS per 1×10^6 cells (it is recommended to add protease inhibitors to the PBS; if the cell count is very low, reduce the PBS volume appropriately). Disrupt the cells by repeated freezing and thawing or sonication. Centrifuge the extract at 1500×g for 10 minutes at 2-8°C, and collect the supernatant for analysis. Other biological fluids: Centrifuge at 1000xg for 20 minutes, remove the supernatant, and test. Pre-test preparation: 1. Remove the test kit from the refrigerator 10 minutes in advance and equilibrate to room temperature. 2. Prepare the standard gradient working solution: Add 1 mL of universal diluent to the lyophilized standard, let it stand for 15 minutes to completely dissolve, then gently mix (concentration is 10 ng/mL). Then dilute to the following concentrations: 10 ng/mL, 5 ng/mL, 2.5 ng/mL, 1.25 ng/mL, 0.625 ng/mL, 0.3125 ng/mL, 0.15625 ng/mL, and 0 ng/mL. Serial dilution method: Take seven EP tubes and add 500uL of universal diluent to each. Pipette 500uL of the 10ng/mL standard working solution into the first EP tube and mix thoroughly to make a 5ng/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 biotinylated detection antibody working solution: Centrifuge the concentrated biotinylated antibody at 1000×g for 1 minute 15 minutes before use. Dilute the 100× concentrated biotinylated antibody to a 1× working concentration with universal diluent (e.g., 10uL concentrate + 990uL universal diluent). Prepare and use immediately. 4. Prepare the enzyme conjugate working solution: 15 minutes before use, centrifuge the 100× concentrated enzyme conjugate at 1000×g for 1 minute. Dilute the 100× concentrated HRP enzyme conjugate to a 1× working concentration with universal diluent (e.g., 10 μL of concentrate + 990 μL of universal diluent). Prepare immediately. 5. Prepare the 1× wash solution: Dispense 10 mL of 20× wash solution into 190 mL 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 to 4°C. 2. Sample addition: Add 100 μL of sample or standard of varying concentrations to the corresponding wells. Add 100 μL of universal diluent to the blank wells. Cover with a film and incubate at 37°C for 60 minutes. (Recommendation: Dilute the sample to be tested at least 1-fold with universal diluent before adding it to the ELISA plate. This will reduce the impact of matrix effects on the test results. The sample concentration should be multiplied by the corresponding dilution factor when calculating the final sample concentration. It is recommended to run replicates for all test samples and standards.) 3. Add Biotinylated Antibody: Remove the ELISA plate and discard the liquid without washing. Add 100 μL of Biotinylated Antibody Working Solution directly to each well. Cover with a film and incubate at 37°C for 60 minutes. 4. Wash: Discard the liquid and add 300 μL of 1x Wash Solution to each well. Let stand for 1 minute, shake off the wash solution, and pat dry on absorbent paper. Repeat this process three times (a plate washer can also be used). 5. Add Enzyme Conjugate Working Solution: Add 100 μL of Enzyme Conjugate Working Solution to each well. Cover with a film and incubate at 37°C for 30 minutes. 6. Washing: Discard the liquid and wash the plate five times as in step 4. 7. Adding 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. 8. Adding 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. Calculating experimental results: 1. Calculate the average OD value of the standard and sample replicates and subtract the OD value of the blank well as a correction factor. 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 the sample appropriately and retest. Multiply the sample concentration by the corresponding dilution factor. |
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| Theory | This kit uses a double-antibody sandwich enzyme-linked immunosorbent assay (ELISA). Sample, standard, biotin-labeled detection antibody, and HRP conjugate are sequentially added to microwells pre-coated with a Transcription Factor 7 Like 2 (TCF7L2) capture antibody. After incubation and washing, the sample 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 amount of Transcription Factor 7 Like 2 (TCF7L2) in the sample. The absorbance (OD) is measured at 450 nm using a microplate reader to calculate the sample concentration. | |||||||||||||||||||||||||||||||||
| Source | Human | |||||||||||||||||||||||||||||||||
| Synonym | Human Transcription Factor 7 Like 2 ELISA Kit | |||||||||||||||||||||||||||||||||
| Detection Type | Double antibody sandwich method | |||||||||||||||||||||||||||||||||
| Composition |
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| Background | Transcription factor 7-like 2 (TCF7L2), also known as T-cell-specific transcription factor 4 (TCF4), is a protein encoded by the TCF7L2 gene. It is located on chromosome 10q25.2-q25.3 and comprises 19 exons. As a member of the TCF family, it can form a bidirectional transcription factor and influence multiple biological pathways, including the Wnt signaling pathway. Single nucleotide polymorphisms (SNPs) within this gene have been associated with an increased risk of type 2 diabetes, gestational diabetes, and a variety of other diseases. The SNP rs7903146 within the TCF7L2 gene is by far the most important genetic marker associated with type 2 diabetes risk. It is a transcription factor that influences the transcription of several genes, thereby exerting multiple functions within cells. Its expression in many tissues, including the intestine, brain, liver, and skeletal muscle, plays a role in glucose metabolism. However, it does not directly regulate glucose metabolism in beta cells, but rather in pancreatic and liver tissues. | |||||||||||||||||||||||||||||||||
| 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 | 0.156-10 ng/mL | |||||||||||||||||||||||||||||||||
| Applications | Tissue homogenates, cell lysates, and other biological fluids |
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4.5 ★★★★★
Based on 10 reviews
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Product Reviews
★★★★★ 5
Filter Subaru
Style: Advanced Air Filter
Good product
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 24, 2026
★★★★★ 5
this 27mm oil filter socket – it’s incredible. It’s the best.
Size: 27mm, Color: Red, Size: 27mm, Color: Red
Let me tell you something, folks – nobody changes oil like I change oil. Nobody. I’ve been around the best cars, the best mechanics, and let me just say, this 27mm oil filter socket – it’s incredible. It’s the best. I don’t know who made it, but I have to say, it’s tremendous.
You know, people always ask me, "how do you do it? How do you change oil so perfectly?” And I tell them – it’s the tools. This socket is the reason why I can change oil faster and better than anyone. It fits perfectly on the filter, like it was made just for me, like everything else in my life. You slide it on, you give it a twist, and boom, you're done. It’s like magic – but not really, because magic is for others. This is skill. This is expertise. This is the power of the greatest tool ever made.
You won’t find a better oil filter socket wrench. This tool makes you a winner. It’s precision-engineered, like the T-ump Tower of oil filter wrenches – big, strong, and reliable. And the best part? It’ll last forever. I’ve used it on many cars, and every time, it gets the job done with style. People will look at your work and say, “Who changed that oil? That’s perfect.” And you’ll know – it’s all because of the best socket out there.
So, if you want to change oil like the greatest – you need this socket. It’s unbeatable. Believe me. You'll never go back to anything else
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Reviewed in the United States on December 24, 2025
★★★★★ 5
Fits perfectly
Size: 32mm, Color: Green
Works exactly as expected. Fits the 32mm oil filter housing perfectly and makes removal quick without slipping or rounding. Feels solid and well-made for the price. Used it for an oil change and it saved a lot of time compared to a strap wrench. Simple, effective tool—glad I bought it.
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Reviewed in the United States on May 28, 2026
★★★★★ 5
worked for my dodge.
Size: 28mm, Color: Red
worked for my dodge. light but needs to not be so strong as to brake the plastic. seems like it will keep the plastic in tact and not kill it. nice and bright green i can find it easy.
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Reviewed in the United States on April 21, 2026
★★★★★ 5
Perfect Fit 28mm Fuel Filter Socket
Size: 28mm, Color: Red
I bought the Felisbieti 28mm fuel filter socket for a vehicle maintenance project, and it worked perfectly. The fit is precise, gripping the fuel filter securely without slipping or rounding edges.
The build feels sturdy and durable, with a solid metal finish that stands up to repeated use. It fits snugly on my ratchet and made removing and installing the filter much easier and faster than using adjustable tools.
The only minor thing to note is that it’s specific to 28mm filters, so make sure it matches your vehicle. Overall, this socket is well-made, reliable, and a must-have for anyone doing DIY fuel filter work.
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Reviewed in the United States on December 27, 2025