Components
Pre-coated, ready to use 96-well strip plate
Plate sealer for 96 wells
Standard
Standard Diluent
Detection Reagent A
Detection Reagent B
Assay Diluent A
Assay Diluent B
TMB Substrate
Stop Solution
Wash Buffer (30 x concentrate)
Instruction manual
Material not included
1.Microplate reader with 450 ± 10nm filter.
2.Precision single or multi-channel pipettes and disposable tips.
3.Eppendorf Tubes for diluting samples.
4.Deionized or distilled water.
5.Absorbent paper for blotting the microtiter plate.
6.Container for Wash Solution
7.0.01Mol/L (or 1x) Phosphate Buffered Saline(PBS), pH 7.0-7.2.
Reagent Preparation
1.Bring all kit components and samples to room temperature (18-25 °C) before use.
2.Standard - Reconstitute the Standard with 1.0 mL of Standard Diluent, kept for 10 minutes at room temperature, shake gently.
3.Dilute Detection Reagent A and Detection Reagent B to the working concentration 100-fold with Assay Diluent A and B, respectively.
4.Wash Solution - Dilute 20 mL of Wash Solution concentrate (30x) with 580 mL of deionized or distilled water to prepare 600 mL of Wash Solution (1x).
5.TMB substrate - Aspirate the needed dosage of the solution with sterilized tips and do not dump the residual solution into the vial again.
Assay Procedure
1.Add 50μL each of dilutions of standard, blank and samples into the appropriate wells, respectively. And then add 50μL of Detection Reagent A to each well immediately. Incubate for 1 hour at 37 °C.
2.Aspirate the solution and wash with 350μL of 1X Wash Solution to each well and let it sit for 1-2 minutes. Remove the remaining liquid from all wells completely. Repeat 3 times.
3.Add 100μL of Detection Reagent B working solution to each well. Incubate for 30 minutes at 37 °C after covering it with the Plate sealer.
4.Repeat the aspiration/wash process for total 5 times as conducted in step 2.
5.Add 90μL of Substrate Solution to each well. Incubate for 15 - 25 minutes at 37 °C. Protect from light.
6.Add 50μL of Stop Solution to each well.
7.Remove any drop of water and fingerprint on the bottom of the plate and confirm there is no bubble on the surface of the liquid. Then, run the microplate reader and conduct measurement at 450nm immediately.
Calculation of Results
This assay employs the competitive inhibition enzyme immunoassay technique, so there is an inverse correlation between target concentration in the sample and the assay signal intensity. Average the duplicate readings for each standard, control, and samples. Create a standard curve on log-log or semi-log graph paper, with the log of target concentration on the y-axis and absorbance on the x-axis. Draw the best fit straight line through the standard points and it can be determined by regression analysis.
Assay Precision
Intra-assay Precision (Precision within an assay): 3 samples with low, middle and high level of target were tested 20 times on one plate, respectively.
Inter-assay Precision (Precision between assays): 3 samples with low, middle and high level of target were tested on 3 different plates, 8 replicates in each plate.
CV(%) = SD/meanX100
Intra-Assay: CV < 10%
Inter-Assay: CV < 12%
Storage Comment
For unused kit: All the reagents should be kept according to the labels on vials. The Standard, Detection Reagent A, Detection Reagent B and the 96-well strip plate should be stored at -20 °C upon receipt while the others should be at 4 °C.
For used kit: When the kit is used, the remaining reagents need to be stored according to the above storage condition. Besides, please return the unused wells to the foil pouch containing the desiccant pack, and zip-seal the foil pouch.
Note
For unused kit: All the reagents should be kept according to the labels on vials. The Standard, Detection Reagent A, Detection Reagent B and the 96-well strip plate should be stored at -20 °C upon receipt while the others should be at 4 °C.
For used kit: When the kit is used, the remaining reagents need to be stored according to the above storage condition. Besides, please return the unused wells to the foil pouch containing the desiccant pack, and zip-seal the foil pouch.
Restrictions
For Research Use only