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For research use only. Not for use in diagnostic procedures

      Human IL-5 ELISA KIT

MANUFACTURED AND DISTRIBUTED BY:

Country︱Company: China︱Beijing Solarbio Science & Technology Co., Ltd

Address: NO.8, Liandong U Valley, Tongzhou District, Beijing, P.R.China.

     86-10-56371241    86-10-56371282    : service@solarbio.com

    Human IL-5 ELISA KIT

TABLE OF CONTENTS

SECTION

                                          PAGE                                                BACKGROUND...........................................................................................3

PRINCIPLE OF THE ASSAY......................................................................3

TECHNICAL HINTS AND LIMITATIONS...............................................4

PRECAUTIONS............................................................................................4

KIT COMPONENTS& STORAGE CONDITIONS.....................................5

OTHER SUPPLIES REQUIRED BUT NOT SUPPLIED............................6

SPECIMEN COLLECTION & STORAGE..................................................6

REAGENTS PREPARATION......................................................................6

ASSAY PROCEDURE .................................................................................8

CALCULATION OF RESULTS...................................................................8

PERFORMANCE CHARACTERISTICS....................................................10

REFERENCES..............................................................................................12

BACKGROUND

Interleukin 5 (IL5) is an interleukin produced by type-2 T helper cells and mast cells.Interleukin-5 has long been associated with the cause of several allergic diseases including allergic rhinitis and asthma, wherein a large increase in the number of circulating, airway tissue, and induced sputum eosinophils have been observed. Given the high concordance of eosinophils and, in particular, allergic asthma pathology, it has been widely speculated that eosinophils have an important role in the pathology of this disease.

PRINCIPLE OF THE ASSAY

This assay employs the quantitative sandwich enzyme immunoassay technique. A monoclonal antibody specific for IL-5 has been pre-coated onto a microplate. Standards and samples are pipetted into the wells and any IL-5 present is captured by the coated antibody after incubation. Following extensive washing, a biotin-conjugate antibody specific for IL-5 is added to detect the captured IL-5 protein in sample. For signal development, horseradish peroxidase (HRP)-conjugated Streptavidin is added, followed by Tetramethyl-benzidine (TMB) reagent. Following a wash to remove any unbound combination, and enzyme conjugate is added to the wells. Solution containing sulfuric acid is used to stop color development and the color intensity which is proportional to the quantity of bound protein is measurable at 450nm.

Human IL-5 ELISA KIT?

TECHNICAL HINTS AND LIMITATIONS

1.        This Solarbio ELISA should not be used beyond the expiration data on the kit label.

2.        To avoid cross-contamination, use a fresh reagent reservoir and pipette tips for each step.

3.        To ensure accurate results, some details, such as technique, plasticware and water sources should be emphasized.

4.        A thorough and consistent wash technique is essential for proper assay performance.

5.        A standard curve should be generated for each set of samples assayed.

6.        It is recommended that all standards and samples be assayed in duplicate.

7.        Avoid microbial contamination of reagents and buffers. Buffers containing protein should be made under aseptic conditions and be prepared fresh daily.

8.        In order to ensure the accuracy of the results, the standard curve should be made every time.

 PRECAUTIONS

The Stop Solution suggested for use with this kit is an acid solution. Wear protective gloves, clothing, eye, and face protection. Wash hands thoroughly after handling.

KIT COMPONENTS& STORAGE CONDITIONS

**Provided this is within the expiration date of the kit.

OTHER SUPPLIES REQUIRED BUT NOT SUPPLIED

1.        Microplate reader capable of measuring absorbance at 450 nm.

2.        Pipettes and pipette tips.

3.        Deionized or distilled water.

4.        Squirt bottle, manifold dispenser, or automated microplate washer.

5.        500 mL graduated cylinder.

6.        Human IL-5 controls (optional; available from Solarbio).

SPECIMEN COLLECTION & STORAGE

Cell Culture Supernates - Centrifuge cell culture media at 1000×g to remove debris. Assay immediay or aliquot and store samples at ≤ -20°C. Avoid repeated freeze-thaw cycles.

Serum - Use a serum separator tube (SST) and allow samples to clot for 2 hours at room temperature or overnight at 2-8℃. Centrifuge at approximay for 15 minutes at 1000×g. Assay immediay or aliquot and store samples at ≤ -20°C. Avoid repeated freeze-thaw cycles.

Plasma - Collect plasma using EDTA, heparin, or citrate as an anticoagulant. Centrifuge for 15 minutes at 1000×g within 30 minutes of collection. Assay immediay or aliquot and store samples at ≤ -20°C. Avoid repeated freeze-thaw cycles.

Note: The normal human serum or plasma samples are suggested to make a 1:2 dilution.

REAGENTS PREPARATION

1.        Temperature returning - Bring all kit components and specimen to room temperature (20-25℃) before use.

2.        Wash Buffer - Dilute 30mL of Wash Buffer Concentrate with 570mL of deionized or distilled water to prepare 600mL of Wash Buffer. If crystals have formed in the concentrate Wash Buffer, warm to room temperature and mix gently until the crystals have compley dissolved.

3.        StandardSpecimen - Reconstitute the Standard with 1.0mL of deionized or distilled water. This reconstitution produces a stock solution of 2000pg/mL. Allow the standard to sit for a minimum of 15 minutes with gentle agitation prior to making dilutions.Pipette 850mL of Standard/Specimen Diluent into the 300 pg/mL tube, and add 150mL stock solution of 2000 pg/mL into it to get the high standard of 300 pg/mL. Pipette 500mL of Standard/Specimen Diluent into the remaining tubes. Use the high standard to produce a 2-fold dilution series (below). Mix each tube thoroughly and change pipette tips between each transfer. The 300pg/mL standard serves as the high standard. The Standard/specimen Diluent serves as the zero standard (0pg/mL).

*If you do not run out of re-melting standard, store it at -20℃. Diluted standard shall not be reused.

4.        Working solution of Biotin-Conjugate anti-human IL-5 antibody: Make a 1:100 dilution of the concentrated Biotin-Conjugate solution with the Biotin-Conjugate antibody Diluent in a clean plastic tube.

*The working solution should be used within one day after dilution.

5.        Working solution of Streptavidin-HRP: Make a 1:100 dilution of the concentrated Streptavidin-HRP solution with the Streptavidin-HRP Diluent in a clean plastic tube.

*The working solution should be used within one day after dilution.                                   Preparation of IL-5 standard dilutions

ASSAY PROCEDURE

CALCULATION OF RESULTS

1.        The standard curve is used to determine the amount of specimens.

2.        First, average the duplicate readings for each standard, control, and sample. All O.D. values are subtracted by the mean value of blank control before result interpretation.

3.        Construct a standard curve by reducing the data using computer software capable of generating a four parameter logistic (4-PL) curve-fit. As an alternative, construct a standard curve by plotting the mean absorbance for each standard on the y-axis against the concentration on the x-axis and draw a best fit curve through the points on the graph.

4.        The data may be linearized by plotting the log of the IL-5 concentrations versus the log of the O.D. and the best fit line can be determined by regression analysis. This procedure will produce an adequate but less precise fit of the data. If samples have been diluted, the concentration read from the standard curve must be multiplied by the dilution factor.

5.        This standard curve is provided for demonstration only. A standard curve should be generated for each set of samples assayed.

Typical data using the IL-5 ELISA