96T Rat Prolactin (PRL) ELISA Kit Instructions

Quantity

Assay plate

1

Standards (S0-S5)

6x 0.5 ml

Antibody HRP-conjugated

1 x 6 ml 1 x 6 ml

Wash Buffer

1 x 15 ml (20 × concentrate)

Substrate A

1 x 7 ml

Substrate B

1 x 7 ml

Stop Solution

1 x 7 ml

STORAGE

1 Unopened test kits should be stored at 2-8? C upon receipt and 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 A microtiter plate reader with a ba-n-dwidth of 10 nm or less and an optical density range of 0-3 OD or greater at 450nm wavelength is acceptable for use in absorbance measurement.

TECHNICAL HINTS

1 Bring all reagents and plate to room temperature for at least 30 minutes before use. Unused wells need store at 2-8 ℃ and avoid sunlight.

2 Wash Buffer If crystals have formed in the concentrate, warm to room temperature and mix gently until the crystals have completely dissolved. Dilute 15 ml of Wash Buffer Concentrate into deionized or distilled water to prepare 300 ml of Wash Buffer.

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

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

5 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.

6 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.

Precaution: The Stop Solution provided with this kit is an acid solution. Wear eye, ha-nd, face, and clothing protection when using this material.

OTHER SUPPLIES REQUIRED

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

2 Pipettes and pipette tips.

3 Deionized or distilled water.

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

SAMPLE COLLECTION AND STORAGE

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

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

Note: Grossly hemolyzed samples are not suitable for use in this assay.

ASSAY PROCEDURE

Bring all reagents and samples to room temperature before use. It is recommended that all samples, sta-n-dards, and controls be assayed in duplicate.

1 Set a Blank well without any solution. Add 50μl of Sta-n-dard or Sample per well. Sta-n-dard need test in duplicate.

2 Add 50μl of HRP-conjugate to each well (not to Blank well), then 50μl Antibody to each well. Mix well and then incubate for 1 hour at 37 ° C.

3 Fill each well with Wash Buffer (about 250μl), stay for 10 seconds and Spinning. Repeat the process for a total of three 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 and blot it against clean paper towels.

4 Add 50μl of Substrate A and Substrate B to each well, mix well. Incubate for 15 minutes at 37 ° C. Keeping the plate away from drafts and other temperature fluctuations in the dark.

5 Add 50μl of Stop Solution to each well.

6 Determine the optical density of each well within 10 minutes, using a microplate reader set to 450 nm.

CALCULATION OF RESULTS

Average the duplicate readings for each sta-n-dard, Blank, and sample and subtract the optical density of Blank. Create a sta-n-dard curve by reducing the data using computer software capable of generating a four parameter logistic (4-PL ) curve-fit. As an alternative, construct a sta-n-dard curve by plotting the mean absorbance for each sta-n-dard on the x-axis against the concentration on the y-axis and draw a best fit curve through the points on the graph. The data may be linearized by plotting the log of the PRL concentrations versus the log of the OD 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 sta-n-dard curve must be multiplied by the dilution factor.

LIMITATIONS OF THE PROCEDURE

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

4 This assay is designed to eliminate interference by soluble receptors, binding proteins, and other factors present in biological samples. Until all factors have been tested in the Immunoassay, the possibility of interference cannot be excluded.