Human Tacrolimus, FK-506 ELISA Kit
Catalog No: E1207h
FOR RESEARCH USE ONLY; NOT FOR THERAPEUTIC OR DIAGNOSTIC APPLICATIONS!PLEASE READ THROUGH ENTIRE PROCEDURE BEFORE
Tacrolimus,fujimycin, FK-506, fujimycin, Prograf, Advagraf, Protopic
Human Tacrolimus ELISA Kit, Human fujimycin ELISA Kit, Human FK-506 ELISA Kit, Human Prograf ELISA Kit, Human Advagraf
ELISA Kit, Human Protopic ELISA Kit
This immunoassay kit allows for the in vitro quantitative determination of Human tacrolimus,Tacrolimus concentrations in serum, Plasma, tissue homogenates and Cell culture supernates and Other biological fluids.
The microtiter plate provided in this kit has been pre-coated with an antibody specific to Tacrolimus. Standards or samples are then added
to the appropriate microtiter plate wells with a biotin-conjugated polyclonal antibody preparation specific for Tacrolimus and Avidin
conjugated to Horseradish Peroxidase (HRP) is added to each microplate well and incubated. Then a TMB substrate solution is added to
each well. Only those wells that contain Tacrolimus, biotin-conjugated antibody and enzyme-conjugated Avidin will exhibit a change in
color. The enzyme-substrate reaction is terminated by the addition of a sulphuric acid solution and the color change is measured
spectrophotometrically at a wavelength of 450 nm ± 2 nm. The concentration of Tacrolimus in the samples is then determined by
comparing the O.D. of the samples to the standard curve.
Materials and components
Other supplies required
Storage of the kits
The Assay Plate, Standard, Detection Reagent A and Detection Reagent B
should be stored at -20℃ upon being received. After
receiving the kit , Substrate should be always stored at 4℃
.Other reagents are kept according to the labels on vials. But for long term
storage, please keep the whole kit at -20℃. The unused strips should be kept in a sealed bag with the desiccant provided to minimize
exposure to damp air. The test kit may be used throughout the expiration date of the kit (six months from the date of manufacture).
Opened test kits will remain stable until the expiring date shown, provided it is stored as prescribed above.
: Because of the inherent stability of lyophilized material, Nova lifetech may ship these materials at ambient temperature.
Sample collection and storage
- Use a serum separator tube (SST) and allow samples to clot for 30 minutes before centrifugation for 15 minutes at approximately
1000 × g. Remove serum and assay immediately or aliquot and store samples at -20℃ or -80℃.
- Collect plasma using EDTA or heparin as an anticoagulant. Centrifuge samples for 15 minutes at 1000 × g at 2℃ - 8℃ within 30
minutes of collection. Store samples at -20℃ or -80℃. Avoid repeated freeze-thaw cycles.
- The preparation of tissue homogenates will vary depending upon tissue type. For this assay, tissue was rinsed
with 1X PBS to remove excess blood, homogenized in 20 mL of 1X PBS and stored overnight at ≤ -20℃ After two freeze-thaw cycles
were performed to break the cell membranes, the homogenates were centrifuged for 5 minutes at 5000 x g. Remove the supernate and
assay immediately or aliquot and store at ≤ -20℃.
Cell culture supernates and Other biological fluids
- Remove particulates by centrifugation and assay immediately or aliquot and store
samples at -20℃ or -80℃. Avoid repeated freeze-thaw cycles.
Samples to be used within 5 days may be stored at 2-8℃ , otherwise samples must stored at -20℃ (1 month) or -80℃ (2 months)
to avoid loss of bioactivity and contamination.
Tissue or cell extraction samples prepared by chemical lysis buffer may cause unexpected ELISA results due to the impacts of
Influenced by the factors including cell viability, cell number and also sampling time, samples from cell culture supernatant may not
Sample hemolysis will influence the result, so hemolytic specimen can not be detected.
When performing the assay slowly bring samples to room temperature.
Limitations of the procedure
Nova lifetech. is only responsible for the kit itself, but not for the samples consumed during the assay. The user should calculate the
possible amount of the samples used in the whole test. Please reserve sufficient samples in advance.
The kit should not be used beyond the expiration date on the kit label.
Do not mix or substitute reagents with those from other lots or sources.
If samples generate values higher than the highest standard, further dilute the samples with the Sample Diluent and repeat the
assay. Any variation in standard diluent, operator, pipetting technique, washing technique,incubation time or temperature, and kit
- If crystals have formed in the concentrate, warm to room temperature and mix gently until the crystals have completely
dissolved. Dilute 30 mL of Wash Buffer Concentrate into deionized or distilled water to prepare 750 mL of Wash Buffer.
- Reconstitute the Standard with 1.0 mL of Sample Diluent. This reconstitution produces a stock solution of 100 ng/mL. Allow
the standard to sit for a minimum of 15 minutes with gentle agitation prior to making serial dilutions (Making serial dilution in the wells
directly is not permitted). The undiluted standard serves as the high standard (100 ng/mL). The Sample Diluent serves as the zero
ng/mL 100 50.0 25.0 12.5 6.25 3.12 1.56 0
Detection Reagent A and B
- Dilute to the working concentration using Assay Diluent A and B (1:100), respectively.
Allow all reagents to reach room temperature (Please do not dissolve the reagents at 37℃ directly.). All the reagents should be mixed
thoroughly by gently swirling before pipetting. Avoid foaming.
Keep appropriate numbers of strips for 1 experiment and remove extra
strips from microtiter plate. Removed strips should be resealed and stored at 4℃ until the kits expiry date. Prepare all reagents, working
standards and samples as directed in the previous sections. Please predict the concentration before assaying. If values for these are not
within the range of the standard curve, users must determine the optimal sample dilutions for their particular experiments.
1. Add 100 μl of Standard
, Blank, or Sample per well. Cover with the Plate sealer. Incubate for 2 hours at 37℃.
2. Remove the liquid of each well, don’t wash. Add 100 μl of Detection Reagent A
working solution to each well. Cover with the Plate
sealer. Incubate for 1 hour at 37℃. Detection Reagent A working solution may appear cloudy. Warm to room temperature and mix
3. Aspirate each well and wash, repeating the process three times for a total of three washes. Wash by filling each well with Wash Buffer
(approximately 400 μl) using a squirt bottle, multi-channel pipette, manifold dispenser or autowasher. and let it sit for 1~2 minutes.
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 100 μl of Detection Reagent B
working solution to each well. Cover with a new Plate sealer. Incubate for 1 hour at 37℃.
5. Repeat the aspiration/wash process for 5 times as conducted in step 3.
6. Add 90 μl of Substrate Solution
to each well. Cover with a new Plate sealer. Incubate within 15-30 minutes
at 37℃. Protect from
7. Add 50 μl of Stop Solution
to each well. If color change does not appear uniform, gently tap the plate to ensure thorough mixing.
8. Determine the optical density of each well at once, using a microplate reader set to 450 nm.
1. Absorbance is a function of the incubation time. Therefore, prior to starting the assay it is recommended that all reagents should be
freshly prepared prior to use and all required strip-wells are secured in the microtiter frame. This will ensure equal elapsed time for
each pipetting step, without interruption.
2. Please carefully reconstitute Standards or working Detection Reagent A and B according to the instruction, and avoid foaming and
mix gently until the crystals have completely dissolved. The reconstituted Standards Detection Reagent A and B can be used
This assay requires pipetting of small volumes. To minimize imprecision caused by pipetting, ensure that pipettors are
calibrated. It is recommended to suck more than 10μl for once pipetting.
3. To ensure accurate results, proper adhesion of plate sealers during incubation steps is necessary. Do not allow wells to sit uncovered
for extended periods between incubation steps. Once reagents have been added to the well strips, DO NOT let the strips DRY at any
4. For each step in the procedure, total dispensing time for addition of reagents to the assay plate should not exceed 10 minutes.
5. To avoid cross-contamination, change pipette tips between additions of each standard level, between sample additions, and between
reagent additions. Also, use separate reservoirs for each reagent.
6. The wash procedure is critical. Insufficient washing will result in poor precision and falsely elevated absorbance readings.
7. Duplication of all standards and specimens, although not required, is recommended.
8. Substrate Solution is easily contaminated. Please protect it from light.
9. The web version of manual is only for reference, subject to the instruction shipping with the kit.
This assay recognizes recombinant and natural Human Tacrolimus. No significant cross-reactivity or interference was observed.
Limited by current skills and knowledge, it is impossible for us to complete the cross- reactivity detection between Human Tacrolimus and
all the analogues, therefore, cross reaction may still exist.
The minimum detectable dose of Human Tacrolimus is typically less than 0.78 ng/mL.The sensitivity of this assay, or Lower Limit of
Detection (LLD) was defined as the lowest protein concentration that could be differentiated from zero.
Calculation of results
Average the duplicate readings for each standard, control, and sample and subtract the average zero standard optical density. Create 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 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 Tacrolimus
concentrations versus the log of the O.D. and the best fit line can be determined by regression analysis. It is recommended to use some
related software to do this calculation, such as curve expert 1.3. 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.
Limited by the current condition and scientific technology, we can't completely conduct the comprehensive identification and analysis
on the raw material provided by suppliers. So there might be some qualitative and technical risks to use the kit
The final experimental results will be closely related to validity of the products, operation skills of the end users and the experimental
environments. Please make sure that sufficient samples are available.
Kits from different batches may be a little different in detection range, sensitivity and color developing time.Please perform the
experiment exactly according to the instruction attached in kit while electronic ones from our website is only for information.
There may be some foggy substance in the wells when the plate is opened at the first time. It will not have any effect on the final
Do not remove microtiter plate from the storage bag until needed.
A microtiter plate reader with a bandwidth of 10nm or less and an optical density range of 0-3 OD or greater at 450nm wavelength is
acceptable for use in absorbance measurement.
Use fresh disposable pipette tips for each transfer to avoid contamination.
Do not substitute reagents from one kit lot to another. Use only the reagents supplied by manufacturer.
Even the same operator might get different results in two separate experiments. In order to get better reproducible results, the
operation of every step in the assay should be controlled. Furthermore, a preliminary experiment before assay for each batch is
10. Each kit has been strictly passed Q.C test. However, results from end users might be inconsistent with our in-house data due to
some unexpected transportation conditions or different lab equipments. Intra-assay variance among kits from different batches
11. Kits from different manufacturers for the same item might produce different results, since we haven’t compared our products with
12. The instruction manual also suit for the kit of 48T, but all reagents of 48T kit is reduced by half.
The Stop Solution suggested for use with this kit is an acid solution. Wear eye, hand, face, and clothing protection when using this
This graph data is shown as an example. A standard curve must be generated each time
the assay is run.
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