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Description
Human apo-B 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. Centrifuge the specimen 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. 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 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., 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 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. Cell Lysis Buffer: Gently wash adherent cells with ice-cold PBS, then trypsinize and collect cells by centrifugation at 1000×g for 5 minutes. Suspension cells can be collected directly by centrifugation. Wash collected cells three times with ice-cold PBS and resuspend 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 freeze-thaw cycles or sonication. Centrifuge the extract at 1500×g for 10 minutes at 2-8°C, and remove the supernatant for analysis. Cell Culture Supernatant: Centrifuge at 1000×g for 20 minutes. Remove the supernatant for analysis or store at -20°C or -80°C, avoiding repeated freeze-thaw cycles. 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 1mL of universal diluent to the lyophilized standard, let it stand for 15 minutes to completely dissolve, then gently mix (concentration is 20ug/mL). Then dilute to the following concentrations: 20ug/mL, 10ug/mL, 5ug/mL, 2.5ug/mL, 1.25ug/mL, 0.625ug/mL, 0.3125ug/mL, and 0ug/mL. Serial dilution method: Take 7 EP tubes and add 500uL of universal diluent to each tube. Pipette 500uL of the 20ug/mL standard working solution into the first EP tube and mix thoroughly to make a 10ug/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 the liquid from the penultimate tube. See the figure below for details. 3. Preparation of Biotinylated Antibody Working Solution: 15 minutes before use, centrifuge the concentrated biotinylated antibody at 1000×g for 1 minute. Dilute the 100× concentrated biotinylated antibody to a 1× working concentration using universal diluent (e.g., 10µL concentrate + 990µL universal diluent). Prepare immediately before use. 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 apolipoprotein B (apo-B) capture antibody. After incubation and washing, the sample is developed using the substrate TMB. TMB is converted to blue by peroxidase (HRP) catalysis and to yellow by acid. The intensity of the color is positively correlated with the amount of apolipoprotein B (apo-B) in the sample. The absorbance (OD) is measured at 450 nm using a microplate reader to calculate the sample concentration. | |||||||||||||||||||||||||||||||||
| Source | Human | |||||||||||||||||||||||||||||||||
| Synonym | Human Apolipoprotein B ELISA Kit | |||||||||||||||||||||||||||||||||
| Detection Type | Double antibody sandwich method | |||||||||||||||||||||||||||||||||
| Composition |
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| Background | Apolipoprotein B (apo-B) is a protein encoded by the APOB gene. It is the primary apolipoprotein in chylomicrons, VLDL, Lp(a), IDL, and LDL particles, responsible for transporting fat molecules (lipids), including cholesterol, around the body to all cells in all tissues. While its full functional role in LDL (and all larger) particles remains somewhat unclear, it is the primary organizing protein component of the particle (the entire complex outer shell that encloses/carries the fat molecules) and is absolutely required for the formation of these particles. Additionally, apolipoproteins on LDL particles serve as ligands for LDL receptors in various cells throughout the body. | |||||||||||||||||||||||||||||||||
| 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 | 0.31-20ug/mL | |||||||||||||||||||||||||||||||||
| Applications | Serum, plasma, tissue homogenate, cell lysate, cell culture supernatant and other biological fluids |
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4.9 ★★★★★
Based on 1429 reviews
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Product Reviews
★★★★★ 5
We <3 big lambchops
Style: White, Size: 24" Jumbo, Style: White, Size: 24" Jumbo
These are my vizsla's absolute FAVORITE toy. I mean, she doesn't leave the room without bringing at least one. We've bought several of these exact toys now and they're surprisingly durable- we've even put a few through the laundry. She loves to snuggle, nibble, and carry this toy like a security blanket. These are the big ones, so they get a little discolored from her grabbing them around the belly. The squeakers are pretty few and far between so it's generally not noisy unless she's super bored or excited. Get it, your dog will love it and they're cheaper than some of the small ones.
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Reviewed in the United States on March 7, 2026
★★★★★ 5
A Classic Toy My Dog Can’t Get Enough Of!
Style: Blue Birthday Hat, Size: 10.5"
The Multipet Lamb Chop Dog Plush Toy (10.5”, Cream) is an absolute winner in our house! This adorable, nostalgic plush is just as cute as it is entertaining, and my dog fell in love with it the moment it came out of the package.
Super Soft & Cuddly
The material is extra plush and velvety, making it perfect for dogs who love to snuggle. It feels well-made and not scratchy like some cheaper toys.
Squeakers That Keep Dogs Engaged
There are multiple squeakers inside, and they’re loud enough to keep your dog excited but not obnoxious. My pup carries it around proudly and squeaks it nonstop.
Great Size
The 10.5” size is ideal for both small and medium to large dogs. Big enough to cuddle, small enough to toss around easily.
Durable for a Plush Toy
While it’s not built for heavy destroyers (no plush toy truly is), it holds up surprisingly well to daily play and lots of shaking.
Overall:
The Multipet Lamb Chop is a fantastic combo of cuddly plush and squeaky fun. Perfect for fetch, snuggles, or as your dog’s new favorite companion. If your dog enjoys plush toys, this is definitely one to grab.
Highly recommended! 🐑🐶💛
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Reviewed in the United States on December 11, 2025
★★★★★ 5
BEST TOY!
Style: White, Size: 6"
I recently bought the Multipet INTERNATIONAL 843140 Lambchop Plush Squeak Toy Mini for my small dog, and it has quickly become her favorite toy. Here’s why this little squeak toy is a great addition to any pet’s collection:
Adorable Design
The Lambchop Plush Squeak Toy is absolutely adorable. It resembles the beloved character Lambchop, which adds a nostalgic charm for those who remember the classic TV show. The toy is well-crafted with a cute, friendly face and soft, plush material. Its small size makes it perfect for petite pets, and it’s just the right size for my dog to carry around and snuggle with.
Engaging and Fun
The built-in squeaker adds an extra layer of excitement for my pet. Every time she bites down, the squeak captures her attention and keeps her engaged for longer periods. It’s great for interactive play, fetch, and even as a comforting chew toy. My dog loves the noise it makes and often brings it to me to initiate playtime.
Durable Construction
Despite its soft and plush exterior, the Lambchop toy has proven to be quite durable. My dog is a moderate chewer, and after several weeks of play, the toy is still intact with no signs of wear and tear. The stitching is strong and has held up well against my dog’s playful bites and tugs. However, for very aggressive chewers, it might not last as long.
Easy to Clean
The toy is also relatively easy to clean. I’ve hand-washed it a few times to keep it fresh, and it dries quickly without losing its shape or squeak. The white color, while prone to getting dirty, can be easily spot-cleaned to maintain its appearance.
Perfect Size for Small Pets
At 6 inches, this toy is ideally sized for small dogs and even cats. It’s lightweight and easy for them to carry around. My dog can comfortably grip it in her mouth, and the toy is soft enough for her to cuddle with during nap time.
Value for Money
Considering its durability, engaging design, and the joy it brings to my pet, the Multipet Lambchop Plush Squeak Toy offers excellent value for money. It’s reasonably priced and provides hours of entertainment and comfort for my dog.
Overall Impression
Overall, the Multipet INTERNATIONAL 843140 Lambchop Plush Squeak Toy Mini is a fantastic toy for small pets. Its adorable design, engaging squeaker, and durable construction make it a worthwhile purchase. My dog loves it, and it has quickly become a staple in her toy collection. I highly recommend this toy to anyone looking for a cute and fun squeak toy for their small pet.
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Reviewed in the United States on June 18, 2024
★★★★★ 4
Great, but a little big…
Style: Lambchop, Size: 10"
Super soft and cute, I got this for my toy Cavapoo puppy. The different textures are perfect. It is a little bigger than I was expecting, and will probably be about the same size as my puppy when I get her, but I’m sure she’ll love it. I don’t know how safe it will be yet since I’ve yet to be able to watch her play with it, but I don’t see anywhere that could have loose strings for her to choke on, so I’d say it’s pretty safe. Overall a perfect toy for dogs, with a squeaker and nice textures for the dog to chew on.
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Reviewed in the United States on May 4, 2026
★★★★★ 5
Fun for a dog bad from lamb chop.
Style: Lambchop, Size: 10" (Pack of 2)
My dog loves these but tears the stffing out in one day. Not a bad product just be aware of this fact. Dog is a pit bull terrier.
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Reviewed in the United States on April 24, 2026