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Retinol Binding Protein 4, Plasma (RBP4) ELISA Kit
|Synonyms||rbp4, MGC54038, RBP4, MGC107934, RBP, PRBP|
|3 references available|
|Certificates||ISO 9001:2008, ISO 13485:2003|
|Price||537.26 $ Plus shipping costs $45.00|
|Availability||Will be delivered in 9 to 11 Business Days|
|Method type||Sandwich ELISA|
|Cross-Reactivity (Details)||No significant cross-reactivity or interference between human RBP4 and analogues was observed. Note: Limited by current skills and knowledge, it is impossible for us to complete the cross- reactivity detection between human RBP4 and all the analogues, therefore, cross reaction may still exist.|
|Sample Type||Serum, Plasma, Biological Fluids|
|Plate||Pre-coated 12 × 8 strip|
|Specificity||This assay has high sensitivity and excellent specificity for detection of human RBP4.|
|Sensitivity||The sensitivity of this assay, or Lower Limit of Detection (LLD) was defined as the lowest protein concentration that could be differentiated from zero. It was determined by adding two standard deviations to the mean optical density value of twenty zero standard replicates and calculating the corresponding concentration.|
|Minimum Detection Limit||14.2pg/mL|
Intra-assay Precision (Precision within an assay): 3 samples with low, middle and high level human RBP4 were tested 20 times on one plate, respectively.
Inter-assay Precision (Precision between assays): 3 samples with low, middle and high level human RBP4 were tested on 3 different plates, 8 replicates in each plate.
CV(%) = SD/meanX100
Intra-Assay: CV < 10%
Inter-Assay: CV < 12%
The standard curve concentrations used for the ELISA’s were 2,000pg/mL, 1,000pg/mL, 500pg/mL, 250pg/mL, 125pg/mL, 62.5pg/mL, 31.2pg/mL.The stability of ELISA kit is determined by the loss rate of activity. The loss rate of this kit is less than 5% within the expiration date under appropriate storage condition.
|Principle||The kit is a sandwich enzyme immunoassay for in vitro quantitative measurement of RBP4 in human serum, plasma and other biological fluids.|
The microtiter plate provided in this kit has been pre-coated with an antibody specific to RBP4. Standards or samples are then added to the appropriate microtiter plate wells with a biotin-conjugated antibody preparation specific for RBP4. Next, Avidin conjugated to Horseradish Peroxidase (HRP) is added to each microplate well and incubated. After TMB substrate solution is added, only those wells that contain RBP4, biotin-conjugated antibody and enzyme-conjugated Avidin will exhibit a change in color. The enzyme-substrate reaction is terminated by the addition of sulphuric acid solution and the color change is measured spectrophotometrically at a wavelength of 450nm ± 10nm. The concentration of RBP4 in the samples is then determined by comparing the O.D. of the samples to the standard curve.
Serum: Use a serum separator tube and allow samples to clot for two hours at room temperature or overnight at 4°C before centrifugation for 20 minutes at approximately 1000×g. Assay freshly prepared serum immediately or store samples in aliquot at -20°C or -80°C for later use. Avoid repeated freeze/thaw cycles.
Plasma: Collect plasma using EDTA or heparin as an anticoagulant. Centrifuge samples for 15 minutes at 1000×g at 2 - 8°C within 30 minutes of collection. Remove plasma and assay immediately or store samples in aliquot at -20°C or -80°C for later use. Avoid repeated freeze/thaw cycles.
Other biological fluids: Centrifuge samples for 20 minutes at 1000×g. Remove particulates and assay immediately or store samples in aliquot at -20°C or -80°C for later use. Avoid repeated freeze/thaw cycles.
|Calculation of Results||Average the duplicate readings for each standard, control, and samples and subtract the average zero standard optical density. Construct a standard curve by plotting the mean O.D. and concentration for each standard and draw a best fit curve through the points on the graph or create a standard curve on log-log graph paper with RBP4 concentration on the y-axis and absorbance on the x-axis. Using some plot software, for instance, curve expert 1.30, is also recommended. If samples have been diluted, the concentration read from the standard curve must be multiplied by the dilution factor.In order to make the calculation easier, we plot the O.D. value of the standard (X-axis) against the known concentration of the standard (Y-axis), although concentration is the independent variable and O.D. value is the dependent variable. However, the O.D. values of the standard curve may vary according to the conditions of assay performance (e.g. operator, pipetting technique, washing technique or temperature effects), plotting log of the data to establish standard curve for each test is recommended. Typical standard curve below is provided for reference only.|
Limited by the current condition and scientific technology, we cant completely conduct the comprehensive identification and analysis on the raw material provided by suppliers. So there might be some qualitative and technical risks to use the kit.
The final experimental results will be closely related to validity of the products, operation skills of the end users and the experimental environments. Please make sure that sufficient samples are available.
Kits from different batches may be a little different in detection range, sensitivity and color developing time.
Do not mix or substitute reagents from one kit lot to another. Use only the reagents supplied by manufacturer.
Protect all reagents from strong light during storage and incubation. All the bottle caps of reagents should be covered tightly to prevent the evaporation and contamination of microorganism.
There may be some foggy substance in the wells when the plate is opened at the first time. It will not have any effect on the final assay results. Do not remove microtiter plate from the storage bag until needed.
Wrong operations during the reagents preparation and loading, as well as incorrect parameter setting for the plate reader may lead to incorrect results. A microplate plate reader with a bandwidth of 10nm or less and an optical density range of 0-3 O.D. or greater at 450 ± 10nm wavelength is acceptable for use in absorbance measurement. Please read the instruction carefully and adjust the instrument prior to the experiment.
Even the same operator might get different results in two separate experiments. In order to get better reproducible results, the operation of every step in the assay should be controlled. Furthermore, a preliminary experiment before assay for each batch is recommended.
Each kit has been strictly passed Q.C test. However, results from end users might be inconsistent with our in-house data due to some unexpected transportation conditions or different lab equipments. Intra-assay variance among kits from different batches might arise from above factors, too.
Kits from different manufacturers for the same item might produce different results, since we havent compared our products with other manufacturers.
|Handling Advice||To minimize extra influence on the performance, operation procedures and lab conditions, especially room temperature, air humidity, incubator temperature should be strictly controlled. It is also strongly suggested that the whole assay is performed by the same operator from the beginning to the end.|
|Precaution of Use||The Stop Solution suggested for use with this kit is an acid solution. Wear eye, hand, face, and clothing protection when using this material.|
|Material not included||
|Expiry Date||The expiry date is stated on the label.|
|Research Area||Cardiovascular, Atherosclerosis, Metabolism, Hormones, Cytokines|
|Restrictions||For Research Use only|
Riaz, Alam, Srai et al.: "Proteomic identification of human urinary biomarkers in diabetes mellitus type 2." in: Diabetes technology & therapeutics, Vol. 12, Issue 12, pp. 979-88, 2010 (PubMed).
Maahs, Siwy, Argilés et al.: "Urinary collagen fragments are significantly altered in diabetes: a link to pathophysiology." in: PLoS ONE, Vol. 5, Issue 9, 2010 (PubMed).
Riaz, Skinner, Srai: "Effect of high dose thiamine on the levels of urinary protein biomarkers in diabetes mellitus type 2." in: Journal of pharmaceutical and biomedical analysis, Vol. 54, Issue 4, pp. 817-25, 2010 (PubMed).