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Description
Human Bruton'S Tyrosine Kinase ELISA KitProduct Specification Usage Sample collection, processing and storage methods: 1, serum: use do not contain pyrogen and endotoxin in vitro, in the process of operation to avoid any cell stimulation, collect blood after 3000 turn centrifugal 10 minutes to separate serum and erythrocyte quickly carefully. 2, plasma: EDTA, citric acid salt or heparin anticoagulation. The supernatant was removed by centrifugation at 3000 RPM for 30 min. 3, on the cell
Product Specification
| Usage | Sample collection, processing and storage methods: 1, serum: use do not contain pyrogen and endotoxin in vitro, in the process of operation to avoid any cell stimulation, collect blood after 3000 turn centrifugal 10 minutes to separate serum and erythrocyte quickly carefully. 2, plasma: EDTA, citric acid salt or heparin anticoagulation. The supernatant was removed by centrifugation at 3000 RPM for 30 min. 3, on the cell supernatant: 3000 turn 10 minutes of centrifugal to get rid of particle and polymer. 4. Tissue homogenate: add appropriate amount of normal saline to the tissue and mash it. 3000 turn centrifugal take supernatant 10 minutes. 5. Storage: if the sample is not detected in time after collection, please pack according to the dosage, freeze at -20℃, avoid repeated freezing and thawing, thaw at room temperature and ensure that the sample is evenly and fully thawed. Bring your own items: 1. Microplate reader (450nm) 2 washer, high precision and spear: 0.5-10 ul, 2-20 ul, 20-200 - ul, ul 200-1000 3, 37℃ incubator The reagent preparation: Dilution of 20× wash buffer: Distilled water was diluted 1:20, that is, 1 part of 20× wash buffer was added to 19 parts of distilled water. Washing plate method: 1, hand washing board: jilt liquid in the hole, every hole filled with liquid detergent. Let stand for 1 min after the left hole all liquid, pat dry on blotting paper, so wash board 5 times. 2. Automatic washing machine: inject 350μL of washing solution into each well, soak for 1min, and wash the plate 5 times. Operation steps: 1. Remove the required slats from the aluminum foil bag after 20min of equilibrium at room temperature, and the remaining slats are sealed with a ziplack and placed back at 4 ° C. Bore 2, set up the standard and sample, standard holes with different concentrations of standard 50 mu L; 3. Add 10μL sample to the sample well, and then add 40μL sample diluent; Blank holes are not added. 4, in addition to the blank hole, bore standard and sample of each hole to join horseradish peroxidase (HRP) labeled 100 mu L detection antibody, seal plate film sealed reaction with hole, 37 ℃ water bath pot or constant temperature box temperature 60 min. 5, abandon to liquid, pat dry on the blotting paper, every hole filled with liquid detergent. Let stand for 1 min, jilt to detergents, pat dry on the blotting paper, repeat 5 times wash plate (also available microplate wash plate). 6, 50μL of substrate A and B were added to each well and incubated at 37 ° C in the dark for 15min. 7, 50 mu, L per hole to join terminated liquid within 15 min, determine the hole in the 450 - nm wavelength, OD value. Results: Drawing standard curve: in Excel worksheets, with standard concentration as the abscissa, ordinate corresponding OD value, draw the standard linear regression curve, the curve equation of the sample density is calculated. |
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| Theory | Double-antibody one-step sandwich enzyme-linked immunosorbent assay (ELISA) was used. Samples, standards, and HRP-labeled detection antibodies were added to the coated microwells precoated with Bruton's tyrosine kinase (Btk) antibody in turn, then incubated and washed thoroughly. After incubation and thorough washing, the substrate TMB was used for color development. TMB was converted to blue under the catalysis of peroxidase and to yellow under the action of acid. The degree of color is positively correlated with the level of Bruton's tyrosine kinase (Btk) in the sample. The activity of the samples was calculated by measuring the absorbance (OD) value at 450nm using a microplate reader. | |||||||||||||||||||||||||||||||||
| Detection Type | Serum, cell supernatant, and tissue homogenate urine | |||||||||||||||||||||||||||||||||
| Description |
Bruton's tyrosine kinase (Btk or BTK for short), also known as tyrosine protein kinase BTK, is a tyrosine kinase encoded by the BTK gene. BTK plays a crucial role in B cell development. BTK contains five different protein interaction domains. These domains include an amino-terminal pleckstrin homology (PH) domain, a proline-rich TEC homology (TH) domain, the SRC homology (SH) domains SH2 and SH3, and a kinase structure with enzymatic activity. BTK plays a critical role in B cell development because it is required to transmit signals from pre-B cell receptors formed after successful immunoglobulin heavy chain rearrangement. Btk contains a PH domain that binds to phosphatidylinositol-triphosphate (PIP3). Binding of PIP3 induces Btk to phosphorylate phospholipase C, which in turn hydrolyses PIP2 (a phosphatidylinositol) to two second messengers, inositol triphosphate (IP3) and diacylglycerol (DAG), which then regulate the activity of downstream proteins during B-cell signaling. kit performance: |
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| Composition |
Note: The concentrations of standard substance (S0-S5) were 0, 75, 150, 300, 600, 1200 U/mL |
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| General Notes | 1. The kit was stored at 2-8 ° C and equilibrated at room temperature for 20 minutes before use. The concentrated washing solution removed from the refrigerator will have crystallization, which is a normal phenomenon, and the water bath will be heated to completely dissolve the crystals before use. 2. The slats that are not used in the experiment should be put back into the ziplock bag immediately, sealed (dry at low temperature) and stored. 3, concentration of 0 S0 standard can be regarded as negative control or blank; When operating according to the instructions, the sample has been diluted 5 times, and the final result multiplied by 5 is the actual concentration of the sample. 4, in strict accordance with the instructions indicated in the time, the amount of liquid and the order of the incubation operation. 5, all liquid components shake well before use. |
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| Storage Temp. | 2-8℃, protected from light and moisture, valid for 6 months. |
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| Test Range | 0.625-20 ng/mL |
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4.4 ★★★★★
Based on 7 reviews
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Product Reviews
★★★★★ 5
Good value, good product
These are fine for the money. Absorbent, strong enough. Good value, will re-order these.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 16, 2026
★★★★★ 5
Simple, Durable, and a Great Pantry Staple
I bought these because they were inexpensive, and they turned out to be exactly what I expected in a good way.
They’re durable, have the size and softness of a standard everyday napkin, and the absorbency is solid for normal meals and spills.
The pack is a good size—it fits easily in my pantry but still holds a lot of napkins, so it lasts a long time before needing to restock.
If you’re just looking for simple, reliable napkins at a great price, these are a really good value.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 12, 2026
★★★★★ 4
Good Value Napkins for Everyday Use
These napkins are a good everyday option. The size is large, they’re affordable, and the quality is good for the price. I like that they have a textured surface, which makes them more useful than plain napkins.
They are a bit thin, so I didn’t give 5 stars, but for daily meals and regular use, they work great. Overall, a solid and budget-friendly product.
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Reviewed in the United States on January 21, 2026
★★★★★ 5
Good Value and good napkins !!!
Such a good value and nice napkins ! We use tons of them !
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Reviewed in the United States on May 30, 2026
★★★★★ 5
Soft and convenient, but slightly thin
I bought these disposable napkins for family dinners and small gatherings, and overall they’ve been very useful. They’re soft enough to feel comfortable while still absorbing spills and messes fairly well. I also like that the size is practical for everyday meals and snacks, and the stack fits neatly on the table without taking up much space. The napkins separate easily too, which is convenient when guests are around. However, they are a little thinner than I expected, so sometimes I end up using two for bigger spills. Still, they work well for regular use and are a convenient option to keep around the kitchen and dining area.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 15, 2026
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