ELISA Kit for the Quantitative Analysis of Human IL-1β

 

The human IL-1β ELISA (enzyme-linked immunosorbent assay) kit is used for detection of human IL-1β in cell culture supernatants,human serum and plasma.THE ELISA KIT IS FOR RESEARCH USE ONLY.

Introduction

Interleukin-1, also known as a lymphocyte activating factor, is a polypeptide cytokine with IL-1βa and IL-1βb molecular forms, involved in a variety of cellular activities, including cell proliferation, differentiation, and apoptosis. IL-1βb is mainly produced by mononcytes and macrophages in the blood, and it is also produced by epithelial cells, endothelial cells and mesenchymal cells. After it is produced by activated macrophages, proteolytically processed to its active form by caspase 1, the mature IL-1β stimulates thymocyte proliferation through inducing IL-2 release, B-cell maturation and proliferation, and fibroblast growth factor activation. It is also reported that the IL-1βb is involved in the inflammatory response, plays the role of mediator, being identified as endogenous pyrogens, endotoxin or other non-bacterial inflammatory factors which induce the release of IL-1β. The high level of IL-1β in the body always corresponds to the tissue injury or infection, such as septicemia. The studies of IL-1β are basically focusing on various physiological and pathological immune responses, and the disease processes related to inflammatory reactions.

Principles of the Test

The kits is a solid sandwich enzyme-linked immunosorbent assay for detection of human IL-1β. An anti-human IL-1β monoclonal antibody has been absorbed onto the wells of the microtiter strips provided. Samples including specimens or standards were pipetted into wells. The human IL-1β in specimens or standards would be captured by the coated antibody and the free others were removed by washing. The human IL-1β biotin-conjugated antibody were added and binds to human IL-1β captured by the first antibody, which formed a sandwich. Streptavidin-HRP would be added and binds to the biotin conjugated antibody, then free Streptavidin-HRP would be removed during a wash step. After this, substrate solution would be added and catalyzed by the HRP, and a coloured product is formed. The intensity of the colored product is used to calculate in proportion to the amount of human IL-1β in the original specimen. Materials provided with the kit:

Specimen Collection

1. Collecting specimen as following:

A. The particulate of the cell culture supernatants should be removed before use.

B. Serum was obtained from clot at room temperature.

C. Please collect plasma with EDTA.

D. Assay immediately or store samples at －20℃. Avoid free-thaw cycles.

2. Antiseptic and anticoagulant should not appear in Serum samples.

3. Any particulate should be removed from samples before use.

4. Do not use grossly hemolyzed or lipemic samples.

Note: Strongly recommend that the serum and plasma samples should be diluent as doubling dilution before use.

Precautions for use:

1.Please storage the Kit at 2～8℃。

2. Washing buffer concentrate may have crystal in low temperature, and you can melt its in water-bath before use.

3. Please discard the remains after use of the dissolved standard.

4. Avoid contact of substrate solution with oxidizing agents and metal.

5. Usage of  disposable pipette tips avoid microbial contamination or cross-contamination of reagents or specimens.

6. Do not mix or substitute reagents with those from other lots or other sources.

7. To ensure the adequate mixture of added reagents, please tap gently the plate after the wells were filled with liquid.

8. Incubation temperature should be 25～28℃.

9. Wash step was crucial for whole assay process.

10. Duplicate wells of the same sample were recommended in assay process.

11. Avoid the foam while pour the liquid into wells.

12. For serum or plasma samples ,the biotin-conjugated antibody should be incubate for at least 90 minutes.

Reagent Preparation

1. The reagents should be warmed up to room temperature before use. The remanent reagents must reseal and put into refrigeratory again as soon as possible.

2. Dilute 1ml of wash buffer Concentrate into 19ml deionized or distilled water to work.

3. If you have a 5x standard diluent, please dilute it with double steaming water or deionized water.

4. Add the standard dilution solution to the bottle according to the volume of the label and wait 15 minutes for complete dissolution. Incubation temperature should be 25～28℃。 And in turn add the half concentration diluent by standard diluent .

Wash step:

Automated microplate washer or operating by pipette: Each well should be pour into300ul wash buffer and soak 15 or 30 seconds,then be aspirated, five times process were repeated. After the last wash, remove remaining wash buffer by aspirating.Invert the plate and blot it against clean paper towels.

Materials Required But Not Provided

1. pipettes and pipette tips

2. Microwell strip reader capable of reading at 450 nm (540 nm as optional reference wave length)

3. automated microplate washer

4.Glass-distilled or deionized water

Assay procedure

1.The needed strips were putted into the frame, the remains were returned into foil pouch and resealed.

2.Blank well were recommended, which only color reagent and stop solution be added. It is suggested that each testing with gradient density of standard for standard curve.

3.Add 100ul of standard or sample.Cover with the Plate Covers provided.Incubate for 2 hours at room temperature If assay the serum sample,you should add 50μl assay buffer with 50μl sample into the wells,if the protein concentration is higher than the range of the Kit, add the same quantitys assay buffer with the sample, the deficiency should be complemented with sample diluent to 100μl per well.

4.Five times wash process were repeated.

5.Add 100ul of detection antibody. Cover with the Plate Covers provided.Incubate for 1 hour at room temperature.

6.Five times wash process were repeated.

7.Add 100ul of Streptavidin-HRP. Cover with the Plate Covers provided. Lucifugal incubation for 20 minutes at room temperature.

8.Five times wash process were repeated.

9.Add 100ul of TMB，Lucifugal incubation for 20 minutes at room temperature.

10.Add 50ul of stop solution to each well, determine the optical density of each well within 10 minutes.              Calculation of Results

1.Duplicates should be within 20 per cent of the mean. Average absorbance values for each set of duplicate samples were used as detection results.

2.The blank absorbance values of subtract should be deducted.

3.Drawing a best fit curve through the points of graph. Draw the standard curve by plotting assayed OD value (on the Y axis) vs. concentration (on the X axis). The sample concentration was obtained based on its OD value founding in the standard concentration curve.

4.If the values obtained are not within the expected range of the standard, Samples should be dilute and assay again.

Typical Data and Standard Curve

Human IL-1β standard curve

 

Sensitivity, Specificity, Repeatability

Sensitivity: repeated assays were evaluated and the minimum detectable dose was 2.2pg/ml.

Specificity : No significant cross-reactivity or interference with human IL-1rα,IL-1sRII,IL-1sRI and mouseIL-1α,IL-1β.

Repeatability: The coefficient of variation between wells or plates is less than 10 per cent.