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Matched antibody pair kits include a capture and biotinylated detector antibody pair and a calibrated protein standard. Kits are available in two sizes, with enough reagents for either 2 or 10 x 96-well plates using a standard sandwich ELISA.
Additional buffers and plates are required for the assay. An accessory pack can be purchased which includes all the reagents required to perform 10 x 96-well plates sandwich ELISA (ab210905).
· Streptavidin-HRP Solution (ab210901), 50 μg/mL. Recommend to dilute to 0.01-0.05 μg/mL in 1X Blocking Buffer
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Wash plate three times with 350 µL of the recommended 1X Wash Buffer (ab206977). Remove liquid completely from last wash by tapping the plate vigorously against a pad of absorbent towels.
Reduce non-specific binding by adding 300 μL of 1X Blocking Buffer (ab210904) to each well, seal the plate and incubate either overnight at 4°C or for 2 hours at room temperature.
Repeat the wash procedure in step 2.
Plate can be used immediately after blocking or stabilized with Immunoassay 1X Blocking Buffer (ab171534) and stored at 4°C.
Prepare serially diluted standards immediately prior to use. Prepare enough of the standard solutions for duplicate measurements of each concentration.
Reconstitute the protein standard sample by adding 100 µL ddH2O water. Gently mix at room temperature for 10 minutes to ensure that the protein is completely in solution. This is the Stock Standard Solution. Unused reconstituted protein standard should be aliquoted and stored -80°C.
Note: Refer to the vial label to see the quantity of protein standard provided.
Label eight tubes, Standards #1– 8.
To prepare Standard #1, dilute the Stock Standard in 1X Blocking Buffer to the highest concentration specified in the product datasheet. A seven-point standard curve using 2-fold serial dilutions in 1X Blocking Buffer is recommended.
Standard #8 is the Blank control (buffer only) and contains no standard protein
Dilute the experimental sample with 1X Blocking Buffer. Dilute the sample so that the resulting concentration is within the dynamic range of the assay. Multiple sample dilutions using 1:2 dilution series is advised if the concentration of the target protein is unknown.
Add 50 μL diluted standard and samples to each well. Seal the plate and incubate for 2 hours at room temperature on a plate shaker set to 400 rpm.
Wash plate three times with 350 μL of 1X Wash Buffer (ab206977). Remove liquid completely from last wash by tapping the plate vigorously against a pad of absorbent towels.
Dilute Detector Antibody from stock concentration of 0.25 mg/mL to the suggested working concertation of 0.5 μg/mL in 1X Blocking Buffer (ab210904) or other appropriate diluent. Refer to the label to see the quantity of Detector Antibody provided.
Note: For best results, the concentration of detector antibody in the working solution may require optimization. See ELISA troubleshooting tips for more information.
Add 50 μL of diluted Detector antibody to each well. Seal the plate and incubate for 1 hour at room temperature on a plate shaker set to 400 rpm.
Repeat wash step as described as in step 14.
Add 100 μL of TMB Substrate to each well and incubate for up to 20 minutes in the dark on a plate shaker set to 400 rpm.
Note: For best results, the incubation time requires optimization.
Add 100 μL of Stop Solution to each well. Shake plate on a plate shaker for 1 minute to mix. Plate can be read kinetically at 400 nm to monitor proper incubation time.
See ELISA troubleshooting tips for more information.
Calculate the average absorbance value for the blank control (zero) standards. Subtract the average blank control standard absorbance value from all other absorbance values.
Create a standard curve by plotting the average blank control subtracted absorbance value for each standard concentration (y‑axis) against the target protein concentration (x-axis) of the standard. Use graphing software to draw the best smooth curve through these points to construct the standard curve. Note: Most microplate reader software or graphing software will plot these values and fit a curve to the data. A four-parameter curve fit (4PL) is often the best choice; however, other algorithms (e.g. linear, semi-log, log/log, 5-parameter logistic) can also be tested to determine if it provides a better curve fit to the standard values.
See our webinar for more information on calculating ELISA raw data.
See our ELISA optimization guide to design your own sandwich ELISA.