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Description
Human POSTN 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 specimens using EDTA or heparin as anticoagulants and centrifuge them at 1000×g for 15 minutes at 2-8℃ within 30 minutes of collection. The supernatant can be tested or stored at -20℃ or -80℃, but repeated freezing and thawing should be avoided. 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 utilizes 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 periostin (POSTN) capture antibody. After incubation and washing, the sample is developed using the substrate TMB. TMB converts to blue under the catalysis of peroxidase (HRP) and to yellow under the action of acid. The intensity of the color is positively correlated with the amount of periostin (POSTN) in the sample. The absorbance (OD) is measured at 450 nm using a microplate reader to calculate the sample concentration. | |||||||||||||||||||||||||||||||||
| Source | Human | |||||||||||||||||||||||||||||||||
| Synonym | Human Periostin ELISA Kit | |||||||||||||||||||||||||||||||||
| Detection Type | Double antibody sandwich method | |||||||||||||||||||||||||||||||||
| Composition |
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| Background | Periostin (POSTN, PN, or osteoblast-specific factor OSF-2) is a protein encoded by the POSTN gene. Periostin acts as a ligand for α-V/β-3 and α-V/β-5 integrins, supporting epithelial cell adhesion and migration. Periostin, a vitamin K-dependent factor of enamel structure, is a secreted extracellular matrix protein originally discovered in mesenchymal lineage cells (osteoblasts, osteoblast-derived cells, periodontal ligament, and periosteum). It has been implicated in epithelial-mesenchymal transition in cancer and mesenchymal differentiation in the developing heart. The protein shares homology with Fasciclin I, a secreted cell adhesion molecule found in insects. In many cancers, periostin binds to integrins on cancer cells, activating Akt/PKB and FAK-mediated signaling pathways. This leads to increased cell survival, invasion, angiogenesis, metastasis, and epithelial-mesenchymal transition. In humans and mice, periostin undergoes alternative splicing at its C-terminal region, generating specific isoforms that are observed in a wide range of cancers, including pancreatic, colon, and breast cancer. While collagens play a wide range of roles in tissue development and disease, their function in tissue remodeling in response to injury is a fundamental common role among these diverse mechanisms. Periostin is temporally upregulated during changes in cell fate, both physiologically and pathologically. It influences extracellular matrix reorganization, tissue remodeling, and epithelial-mesenchymal transition, all of which may be relevant to tissue healing, development, and disease. Thus, it functions as a mediator, balancing appropriate and inappropriate responses to tissue injury. | |||||||||||||||||||||||||||||||||
| 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 | 0.15-10 ng/mL | |||||||||||||||||||||||||||||||||
| Applications | Serum, plasma, and other biological fluids |
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4.0 ★★★★★
Based on 9 reviews
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Product Reviews
★★★★★ 5
All-in-One Cigar Companion – Perfect for the On-the-Go Enthusiast
The DXXULL 4-in-1 Aluminum Alloy Cigar Tube has quickly become my go-to accessory for enjoying cigars during my golf rounds. This sleek black tube combines multiple functions into one compact design, making it incredibly convenient for travel and daily use.
Key Features:
-Built-in Cigar Punch: The integrated punch cutter is sharp and precise, ensuring a clean cut every time. It's especially handy when I forget my regular cutter.
-Hygrometer: The built-in hygrometer allows me to monitor the humidity levels, ensuring my cigar stays fresh and flavorful.
-Cigar Holder: The tube comfortably holds a single cigar, protecting it from damage while on the move.
-Portable Design: Its compact size makes it easy to carry in my golf bag or pocket, ensuring I always have a cigar ready to enjoy.
The aluminum alloy construction feels sturdy and premium, and the airtight seal keeps my cigar in optimal condition. Whether I'm heading to the golf course or just out for a walk, this tube ensures my cigar is always ready for a relaxing smoke
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 17, 2025
★★★★★ 5
My boyfriend couldn't be happier
Color: Red
He lost his original nubber and has been a cigar smoker for 20 + years. He said it is the best thing since it has a nubber, cutter, punch and is very well built. He works in cigar marketing and says it's worth the buy
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Reviewed in the United States on January 23, 2026
★★★★★ 5
10 /10
Color: Gray, Color: Gray
"I was impressed from the start—this cutter arrived quickly and the packaging was beautiful. The moment I held it, I noticed the weight—it feels solid and well-crafted. The engraved details are stunning. The mechanism opens smoothly, and when I made my first cut, it was flawless—no damage to the cigar at all. This is easily a 10/10 product for me!"
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Reviewed in the United States on April 25, 2026
★★★★★ 5
Good buy
Color: Yellow
Good size and weight, makes a clean cut.
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Reviewed in the United States on March 26, 2026
★★★★★ 4
I recommend
Color: Gray
I really like it small enough for everyday carry cuts clean and has a punch my only problem is I like bigger gauage cigars but this handles average 60 ring easy.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 25, 2026
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