Human Immunoglobulin G4 （IgG4）ELISA Kit

（96T）

This immunoassay kit allows for the in vitro quantitative determination of human IgG4 concentrations in serum, plasma.

Expiration date six months from the date of manufacture

 

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The microtiter plate provided in this kit has been pre-coated with human IgG4. Sta-n-dards or samples are then added to the appropriate microtiter plate wells with Horseradish Peroxidase （HRP） -conjugated antibody preparation specific for human IgG4， mix well a-n-d incubated. The more the amount of human IgG4 in samples, the less HRP-antibody bound by pre-coated human IgG4. Then a TMB （3,3',5,5' tetramethyl-benzidine） substrate solution is added to each well. A-n-d the color develops in opposite to the amount of human IgG4 in the sample. The color development is stopped a-n-d the intensity of the color is measured.

This assay recognizes human IgG4. No significant cross-reactivity or interference was observed.

1.    Unopened test kits should be stored at 2-8?C upon receipt a-n-d the microtiter plate should be kept in a sealed bag to minimize exposure to damp air. The test kit may be used throughout the expiration date of the kit. Refer to the package label for the expiration date.

2.    Opened test kits will remain stable until the expiring date shown, provided it is stored as prescribed above.

3.    A microtiter plate reader with a ba-n-dwidth of 10 nm or less a-n-d an optical density range of 0-3 OD or greater at 450nm wavelength is acceptable for use in absorbance measurement.

 

1. Wash Buffer If crystals have formed in the concentrate, warm up to room temperature a-n-d mix gently until the crystals have compley dissolved. Dilute 20 ml of Wash Buffer Concentrate into deionized or distilled water to prepare 500 ml of Wash Buffer.

1          Microplate reader capable of measuring absorbance at 450 nm, with the correction wavelength set at 540 nm or 570 nm.

2          Pipettes a-n-d pipette tips.

3          Deionized or distilled water.

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

5          Serum Use a serum separator tube （SST） a-n-d allow samples to clot for 30 minutes before centrifugation for 15 minutes at 1000 g. Remove serum a-n-d assay immediay or aliquot a-n-d store samples at -20° C. Avoid repeated freeze-thaw cycles.

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

 

Recommend to dilute the serum or plasma samples with Sample Diluent（1:5000） before test. The suggested 5000-fold dilution

can be achieved by adding 2μl sample to 98μl of Sample Diluent, Complete the 5000-fold dilution by adding 2μl of this solution to 198μl of Sample Diluent. The recommended dilution factor is for reference only. The optimal dilution factor should be determined by users according to their particular experiments.

1         Add 50μl of Sta-n-dard, Sample per well. Add 50ul HRP-conjugate to each well immediay. Mix well with the pipette or shake the plate gently for 60 seconds.

2         Then incubate for 30 minutes at 37°C.

3         Aspirate each well a-n-d wash, Wash by filling each well with Wash Buffer （200μl） using a squirt bottle, multi-channel pipette, manifold dispenser or autowasher. Repeating the process for a total of five time washes. Complete removal of liquid at each step is essential to good performance. After the last wash, remove any remaining Wash Buffer by aspirating or decanting. Invert the plate a-n-d blot it against clean paper towels.

4         Add 90μl of TMB Substrate to each well. Incubate for 20 minutes at 37°C. Keeping the plate away from drafts a-n-d other temperature fluctuations in the dark.

5         Add 50μl of Stop Solution to each well when the last four wells containing the lowest concentration of sta-n-dards develop obvious blue color. If color change does not appear uniform, gently tap the plate to ensure thorough mixing.

6         Determine the optical density of each well within 15 minutes, using a microplate reader set to 450 nm.

 

Average the duplicate readings for each sta-n-dard, control, a-n-d sample a-n-d divide the average zero sta-n-dard optical density. Create a sta-n-dard curve by reducing the data using computer software. As an alternative, construct a sta-n-dard curve by plotting the absorbance ratio for each sta-n-dard on the x-axis against the concentration on the y-axis a-n-d draw a best fit curve through the points on the graph. The data may be linearized by plotting the human IgG4 concentrations versus the ratio a-n-d 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 sta-n-dard curve must be multiplied by the dilution factor.

1          The kit should not be used beyond the expiration date on the kit label.

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

3          It is important that the Calibrator Diluent selected for the sta-n-dard curve be consistent with the samples being assayed.

4          If samples generate values higher than the highest sta-n-dard, dilute the samples with the appropriate Calibrator Diluent a-n-d repeat the assay.

5          Any variation in Sta-n-dard Diluent, operator, pipetting technique, washing technique, incubation time or temperature, a-n-d kit age can cause variation in binding.

6         ? This assay is designed to eliminate interference by soluble receptors, binding proteins, a-n-d other factors present in biological samples. Until all factors have been tested in the Immunoassay, the possibility of interference cannot be excluded. TECHNICAL HINTS

7          Centrifuge vials before opening to collect contents.

8          When mixing or reconstituting protein solutions, always avoid foaming.

9          To avoid cross-contamination, change pipette tips between additions of each sta-n-dard level, between sample additions, a-n-d between reagent additions. Also, use separate reservoirs for each reagent.

10     When using an automated plate washer, adding a 30 second soak period following the addition of wash buffer, a-n-d/or rotating the plate 180 degrees between wash steps may improve assay precision.

11     To ensure accurate results, proper adhesion of plate sealers during incubation steps is necessary.

12     Substrate Solution should remain colorless until added to the plate. Keep Substrate Solution protected from light. Substrate Solution should change from colorless to gradations of blue.

13     Stop Solution should be added to the plate in the same order as the Substrate Solution. The color developed in the wells will turn from blue to yellow upon addition of the Stop Solution. Wells that are green in color indicate that the Stop Solution has not mixed thoroughly with the Substrate Solution.