MaxFidelity Taq DNA Polymerase

Catalog Number: TMFV100RX

Unit Size: 100 rxns (1ML)

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MaxFidelity Taq is a new recombinant enzyme with genetic modification for its amino acid sequence, which results 70 times better fidelity than Taq DNA polymerase and an extremely fast elongation rate (as fast as 15 seconds per kilo base, kb).  MaxFidelity Taq has higher stability at high temperature, and this property makes  MaxFidelity Taq perform very well for GC-rich PCR. Being highly thermo-stable,  MaxFidelity Taq DNA Polymerase can remain viable even after being subjected to boiling for 2 minutes. This special enzyme has been modified genetically and needs less concentration of magnesium than other polymerases. The suggestion for magnesium ion in the reaction is 0.8 to 1.2 mM. 10X  MaxFidelity Taq PCR buffer contains no magnesium. A tube of 25 mM MgSO4 is provided. Further optimization can be achieved for different targets of DNAs. Reagents are provided for 100 PCR reactions of 50 μl each.


  • 5’→3’ DNA polymerase activity
  • High reaction rate: 10 seconds/kb. 
  • Generates blunt end amplicon.
  • 3’→5’ exonuclease (proofreading) activity.
  • High fidelity: 70 times higher than Taq polymerase.


Kit Contents:

 MaxFidelity Taq DNA Polymerase (1 U/μl)100 μl x 1 vial10 μl x 1 vial
10X  MaxFidelity Taq PCR buffer1 ml x 1 vial100 μl x 1 vial
25 mM Magnesium Sulfate1 ml x 1 vial100 μl x 1 vial
dNTP Mix (2mM each)1 ml x 1 vial100 μl x 1 vial
DMSO1 ml x 1 vial100 μl x 1 vial


Quality Control

The quality of the  MaxFidelity Taq DNA Polymerase is tested on a lot-to-lot basis to ensure consistent product quality.

Storage Buffer of  MaxFidelity Taq DNA Polymerase

50 mM Tris-HCl (pH 8.1), 60 mM KCl, 0.1 mM EDTA, 1 mM DTT, stabilizers, and 50% (v/v) glycerol.

Unit Definition

One unit of  MaxFidelity Taq DNA Polymerase incorporates 10 nmol of deoxyribonucleotide into acid-insoluble material in 30 minutes at 74°C.


 MaxFidelity Taq DNA Polymerase is suitable for amplifying targets up to 10 kb from the following templates:

Genomic DNA10-200 ng
Plasmid DNA1-5 ng
cDNA~100 ng starting total RNA

Amplification of longer targets (up to 10 kb) may be possible, but may require more template and longer elongation times.


Use 0.3 μM per primer as a general starting point. For larger amounts of template (e.g., 200 ng genomic DNA), increasing the concentration up to 0.5 μM per primer may improve yield.

Annealing Temperature

The annealing temperature is slightly higher than with typical PCR. The optimal annealing temperature should be ~2°C lower than the Tm (melting temperature) of the primers used. A range of 58-68°C is recommended. MgSO4: MgSO4 is not included in the 10X  MaxFidelity Taq PCR buffer, and we suggested working concentration is 1 mM, which is sufficient for most templates. For further optimization, modify the amount of MgSO4 for final 0.8-1.2 mM of the concentration.

Extension Time

As little as 15 seconds per kb may be used; 30 seconds per kb is suitable for most targets.

We recommended use up to 60 seconds per kb for maximum yield.

Required Materials

  • PCR tube
  • PCR instrument
  • RNase-free H2O
  • DNA electrophoresis equipment


 MaxFidelity Taq DNA Polymerase Protocol

  1. For each 50 μl reaction, assemble the following components in a 0.2 ml PCR tube on ice before the experiment:
ComponentVolume (μl)Final Concentration
10X  MaxFidelity Taq PCR Buffer5 μl1X
2 mM dNTP Mix5 μl0.2 mM each
2 mM MgSO42 μl1 mM
Primer mix (10 μM each)1.5 μl0.3 μM each
Template DNAVariablesee Template Part
 MaxFidelity Taq DNA Polymerase (1 U/μl)1 μl1 U
DMSO (for GC-rich target)Variable5~10%
Autoclaved, distilled water to50 μl
  1. Mix gently. If necessary, centrifuge briefly. Cap the tube and place it in the thermal cycler.
  2. To process in the thermal cycler for 35 cycles as follows:
ProcessTemperuture (°C)TimeCycles
Initial Denaturation96-982 minutes1
Denaturation9415 seconds35
Annealing60-68 (Tm of primers minus 2°C)10-30 seconds
Extension6830-60 seconds per kb
of PCR product
Final extension685 minutes1

Note: Optimal conditions for amplification will vary depending on the primers and thermal cycler used.

It may be necessary to optimize the system.

  1. After the PCR reaction, analyze products using standard agarose gel electrophoresis.



Refer to the table below to troubleshoot problems that you may encounter when you did PCR amplification with the kit.

Low yield ofIncomplete concentrationUse the appropriate method for the DNA preparation
PCR productsof start materialsbased on the amount of the starting materials.
DNA degradeDNA is not freshAvoid repeated freeze / thaw cycles of the sample.
Keep DNA preparations on ice or frozen in order to
avoid the degradation.
DNase contaminantUse the fresh TAE or TBE electrophoresis buffer.
Maintain a sterile work environment to avoid
contamination from DNase.


  • During operation, always wear a lab coat, disposable gloves, and protective equipment.


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