Product Description
The Extract-N-Amp™ Blood PCR Kits contain all the reagents needed to rapidly extract and amplify human genomic DNA from whole blood, whole blood dried on a blood card, and cultured mammalian cells. Briefly, DNA is released by incubating the sample with the Lysis Solution at room temperature for 5 minutes for whole blood, at 55 °C for 15 minutes for blood cards, or at 75 °C for 5-10 minutes for cell monolayers. After adding the Neutralization Solution, the extract is ready for PCR.
To amplify the target DNA, the neutralized extract is combined with the Extract-N-Amp™ Blood PCR ReadyMix™ reagent and PCR primers. The Extract-N-Amp™ Blood PCR ReadyMix™ reagent is a 2X reaction mixture containing buffer, salts, dNTPs, and Taq polymerase. It also contains the JumpStart™ antibody for hot-start PCR to enhance specificity. Note that the Extract-N-Amp™ Blood PCR ReadyMix™ reagent has the same formulation as the REDExtract-N-Amp™ Blood PCR ReadyMix™ reagent, except that the red dye is omitted, which enables detection methods where the dye interferes.
| Reagents Provided | Product Number | XNAB2 100 preps, 100 PCRs | XNAB2E 100 preps, 500 PCRs | XNAB2R 1,000 preps, 1,000 PCRs | XNAB2RE 1,000 preps, 5,000 PCRs |
|---|---|---|---|---|---|
| Lysis Solution for Blood | L3289 | 2.5 mL | 2.5 mL | 25 mL | 25 mL |
| Neutralization Solution for Blood | N9784 | 25 mL | 25 mL | 250 mL | 250 mL |
| Extract-N-Amp™ Blood PCR ReadyMix™ reaget − a 2X PCR reaction mix containing buffer, salts, dNTPs, Taq polymerase, and JumpStart™ antibody. | P8115 | 1.2 mL | 5 x 1.2 mL | 12 mL | 5 x 12 mL |
Reagents and equipment required, not provided
- Microcentrifuge tubes or multiwell plate for extractions (200 µL minimal volume)
- Punch and cards for dried blood
- Incubator or oven for blood cards (55 °C) or monolayer cells (75 °C)
- Tubes or plate for PCR
- Thermal cycler
- PCR primers
- Water, PCR reagent, Product No. W1754
Storage/Stability
Store the Extract-N-Amp™ Blood PCR Kits at 2-8 °C for up to 3 weeks. For storage greater than 3 weeks, store at -20 °C. Do not store in a frost-free freezer.
Precautions and Disclaimer
The Extract-N-Amp™ Blood PCR Kits are for R&D use only, not for drug, household or other uses. The Lysis Solution is caustic. Avoid contact with skin. Wear gloves, safety glasses, and suitable protective clothing when handling this or any other reagent provided with the kit. Consult the MSDS for information regarding hazards and safe handing practices.
Procedure
All steps are carried out at room temperature unless otherwise noted.
A. DNA extraction from Whole Blood
1a. Collect blood into tubes containing EDTA, sodium citrate, or sodium heparin. The best results may be obtained
with EDTA or sodium citrate. Mix thoroughly by inversion or rocking.
Note: For non-human sources, collect blood into tripotassium EDTA (E0270), at a final
concentration of 5 mM to prevent coagulation.
2a. Place 20 µL of the Lysis Solution for Blood into a microcentrifuge tube or well of a multiwell plate for each
extraction.
3a. Add 10 µL of blood. Mix thoroughly by vortexing or pipetting.
4a. Incubate at room temperature for 5 minutes.
5a. Add 180 µL of the Neutralization Solution for Blood. Mix thoroughly by vortexing or pipetting.
6a. Store the neutralized blood extract at 4 °C or use 2 µL immediately in PCR. Continue with step 7.
Note: DNA is stable in the extract for at least 6 months at 4 °C.
B. DNA extraction from Blood Cards
1b. Collect the blood sample onto a collection card. Allow to dry completely.
2b. Punch a disk (preferably 1/8 inch or 3 mm) from the blood card and place into a microcentrifuge tube.
Make sure that the punch contains as much of the blood-stained area as possible.
3b. Pipette 20 µL of the Lysis Solution for Blood onto the blood card punch. Samples can be spun in a
microcentrifuge for a few seconds to force the solution into the punch.
4b. Incubate at 55 °C for 15 minutes.
5b. Add 180 µL of the Neutralization Solution for Blood. Mix thoroughly by vortexing or pipetting.
6b Store the neutralized blood extract at 4°C or use 2 µL immediately in PCR. Continue with step 7.
Note: DNA is stable in the extract for at least 6 months at 4 °C.
C. DNA Extraction from Cultured Mammalian Cells
1c. Grow monolayer cells in a multiwell plate until 90 to 95% confluent.
2c. Aspirate the medium from the wells using a pipette tip connected to the vacuum system. The medium must be
removed completely.
3c. Add 20 µL of the Lysis Solution for Blood to the wells.
Note: It is preferred at this point to seal the plate with AlumaSeal™ II (A2350), to prevent
loss by evaporation during incubation in step 4c. The Alumaseal™ can be pierced with a pipette tip to add
the Neutralization Solution for Blood in step 5c. A new layer of AlumaSeal™ can be placed over the original
layer to reseal the plate for storage.
4c. Incubate the plate at 75 °C for 5 to 10 minutes (for a 24 well plate, 5 minutes is recommended to avoid
overdrying the samples).
5c. Add 180 µL of the Neutralization Solution for Blood to each of the wells. Mix the samples by pipetting up and
down.
6c. Store the neutralized cell extract at 4 °C or use 2 µL immediately in PCR. Continue with step 7.
Note: DNA is stable in the extract for at least 6 months at 4 °C.
PCR amplification
The Extract-N-Amp™ Blood PCR ReadyMix reagent contains the JumpStart™ antibody for specific hot start amplification. Therefore, PCR reactions can be assembled at room temperature without premature Taq DNA polymerase activity.
Typical final primer concentrations are approximately 0.4 µM each. The optimal primer concentration and cycling parameters will depend on the system used.
7. Add the following reagents to a thin-walled PCR microcentrifuge tube or plate:
| Reagent | Volume |
|---|---|
| Water, PCR Reagent | x µL |
| Extract-N-Amp™ Blood PCR ReadyMix™ reagent | 10 µL |
| Forward primer | y µL |
| Reverse primer | y µL |
| Neutralized blood extract | 2 µL |
| Total volume | 20 µL |
8. Mix gently.
9. For thermal cyclers without a heated lid, add 20 µL of mineral oil on top of the mixture in each tube to prevent evaporation.
10. Perform thermal cycling. The amplification parameters should be optimized for individual primers, template, and
thermal cycler (see References for guidance).
Common cycling parameters:
| Step | Temp. | Time | Cycles |
|---|---|---|---|
| Initial Denaturation | 94-96 °C | 3 minutes | 1 |
| Denaturation | 94-96 °C | 0.5-1 minutes | |
| Annealing | 45-68 °C | .5-1 minutes | 30-40 |
| Extension | 72 °C | 10 minutes | 1 |
| Final Extension | 72 °C | ||
| Hold | 4 °C | Indefinitely |
11. The amplified DNA can be loaded onto an agarose gel after the PCR is completed with the addition of a separate
loading buffer/tracking dye such as Gel Loading Solution (G2526).
Note: PCR products can be purified, if desired, for applications such as sequencing with the GenElute™ PCR
Clean-Up Kit (NA1020).
| Related Products | Product Number |
|---|---|
| PCR 96-well plates | Z374903 |
| PCR 384-well plates | Z374911 |
| Sealing mats and tape | Z374938 |
| AlumaSeal™ II | A2350 |
| EDTA, tripotassium salt dihydrate | E0270 |
| PCR microtubes | Z374873; Z374962; Z374881 |
| Collection Card | C2613 |
| Neutralization Solution B | N3910 |
| Mineral Oil | M8662 |
| PCR Marker | P9577 |
| Precast Agarose Gels | P6097 |
| TBE Buffer | T4415; T6400; T9525 |
| GenElute™ PCR Clean-Up Kit | NA1020 |
| Gel Loading Solution | G2526 |
| Problem | Cause | Solution |
|---|---|---|
| Little or no PCR product is detected. | PCR reaction is inhibited due to contaminants in the blood extract. | Use less extract or dilute the extract with water and repeat PCR. To test for inhibition, include a DNA control and/or add a known amount of template (100-500 copies) into the PCR mixture along with the blood extract. |
| A PCR component is missing or degraded. | Run a positive control to insure components are functioning. A checklist is also recommended when assembling reactions. | |
| Too few cycles are performed. | Increase the number of cycles (5-10 additional cycles at a time). | |
| The annealing temperature is too high. | Decrease the annealing temperature in 2-4 °C increments. | |
| The primers are not designed optimally. | Confirm the accuracy of the sequence information. If the primers are less than 22 nucleotides long, try to lengthen the primer to 25-30 nucleotides. If the primer has a GC content of less than 45%, try to redesign the primer with a GC content of 45-60%. | |
| The denaturation temperature is too high or too low. | Optimize the denaturation temperature by increasing or decreasing the temperature in 1 °C increments. | |
| The denaturation time is too long or too short. | Optimize the denaturation time by increasing or decreasing the time in 10 second increments. | |
| The extension time is too short. | Increase the extension time in 1 minute increments, especially for long templates. | |
| The target template is complex. | In most cases, inherently complex targets are due to unusually high GC content and/or secondary structure. Betaine has been reported to help amplification of high GC concentration templates at 1.0-1.7 M. | |
| Multiple products are seen. | JumpStart™ antibody is not working correctly. | Do not use DMSO or formamide with Extract-N-Amp™ PCR ReadyMix™ reagent. It can interfere with the enzyme-antibody complex. Other solvents, salts, extremes in pH, or other reaction conditions may reduce the affinity of the JumpStart™ antibody for the Taq polymerase and thereby compromise its effectiveness. |
| Touchdown PCR may be needed. | “Touchdown” PCR significantly improves the specificity of many PCR reactions in various applications. Touchdown PCR uses an annealing/extension temperature that is higher than the Tm of the primers during the initial PCR cycles. The annealing/extension temperature is then reduced to the primer Tm for the remaining PCR cycles. The change can be performed in a single step or in increments over several cycles. | |
| Negative control shows a PCR product or “false positive” results are obtained. | Reagents are contaminated. | We recommend that a reagent blank without DNA template be included as a control in every PCR run to determine if the reagents used in extraction or PCR are contaminated with a template from a previous reaction. |
AlumaSeal is a trademark of Excel Scientific, Inc.
Extract-N-Amp, GenElute, JumpStart, ReadyMix and REDExtract-NAmp are trademarks of Merck KGaA, Darmstadt, Germany or its affiliates. All other trademarks are the property of their respective owners. Detailed information on trademarks is available via publicly accessible resources.
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References
Dieffenbach, C.W., and Dveksler, G.S. (Eds.), PCR Primer: A Laboratory Manual, Cold Spring Harbor Laboratory Press, New York (1995).
Don, R.H., et al., ‘Touchdown' PCR to circumvent spurious priming during gene amplification. Nucleic Acids Res., 19, 4008 (1991).
Erlich, H.A. (Ed.), PCR Technology: Principles and Applications for DNA Amplification, Stockton Press, New York (1989).
Griffin, H.G., and Griffin, A.M. (Eds.), PCR Technology: Current Innovations, CRC Press, Boca Raton, FL (1994).
Innis, M.A., et al., (Eds.), PCR Strategies, Academic Press, New York (1995).
Innis, M., et al., (Eds.), PCR Protocols: A Guide to Methods and Applications, Academic Press, San Diego, California (1990).
McPherson, M.J., et al., (Eds.), PCR 2: A Practical Approach, IRL Press, New York (1995).
Newton, C.R. (Ed.), PCR: Essential Data, John Wiley & Sons, New York (1995).
Roux, K.H. Optimization and troubleshooting in PCR. PCR Methods Appl., 4, 5185-5194 (1995).
Saiki, R. PCR Technology: Principles and Applications for DNA Amplification, Stockton, New York (1989).
NOTICE TO PURCHASER: LIMITED LICENSE
Use of this product is covered by one or more of the following US patents and corresponding patent claims outside the US: 5,789,224 and 5,618,711. The purchase of this product includes a limited, non-transferable immunity from suit under the foregoing patent claims for using only this amount of product for the purchaser’s own internal research. No right under any other patent claim, no right to perform any patented method, and no right to perform commercial services of any kind, including without limitation reporting the results of purchaser's activities for a fee or other commercial consideration, is conveyed expressly, by implication, or by estoppel. This product is for research use only. Diagnostic uses under Roche patents require a separate license from Roche. Further information on purchasing licenses may be obtained by contacting the Director of Licensing, Applied Biosystems, 850 Lincoln Centre Drive, Foster City, California 94404, USA.
JumpStart and JumpStart Antibody are licensed under U.S. Patent No. 5,338,671 and 5,587,287 and corresponding patents in other countries
JC,RC,PHC 01/13-1
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