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  • Crimson LongAmp™ Taq DNA Polymerase


    LongAmp Taq DNA Polymerase is a unique blend of Taq and Deep VentR™ DNA Polymerases. The 3´→ 5´ exonuclease activity of Deep VentR DNA Polymerase increases the fidelity and robust amplification of Taq Polymerase (1).

    Crimson LongAmp Taq DNA Polymerase combines the robust LongAmp Taq DNA Polymerase with a colored reaction buffer. Crimson LongAmp Taq DNA Polymerase can amplify up to 20 kb with minimal or no optimization from DNA samples of both low complexity (i.e. plasmid) and high complexity (i.e. genomic DNA). Maximum amplicon sizes are 30 kb from lambda or human genomic DNA. It offers three unique features, including a color indicator for reaction setup, direct loading of PCR product onto a gel and a tracking dye during electrophoresis.

    Product Source

    An E. coli strain that carries the Taq DNA Polymerase gene from Thermus aquaticus YT-1 and an E. coli strain that carries the Deep VentR DNA Polymerase gene from Pyrococcus species GB-D.

    Reagents Supplied

    The following reagents are supplied with this product:

    Store at (°C)Concentration
    Crimson LongAmp® Taq Reaction Buffer Pack-205X

    Advantages and Features


    • More robust and longer amplicons than Taq


    • Long Range PCR
    • Colony PCR
    • High Throughput PCR

    Properties and Usage

    Unit Definition

    One unit is defined as the amount of enzyme that will incorporate 10 nmol of dNTP into acid insoluble material in 30 minutes at 75°C.

    Reaction Conditions

    1X Crimson LongAmp® Taq Reaction Buffer

    1X Crimson LongAmp™ Taq Reaction Buffer Pack:
    60 mM Tris-SO4
    20 mM (NH4)2SO4
    2 mM MgSO4
    3% Glycerol
    0.06% IGEPAL® CA-630
    0.05% Tween® 20
    0% Acid Red
    pH 9 @ 25°C

    Storage Temperature


    Storage Conditions

    10 mM Tris-HCl
    100 mM KCl
    1 mM DTT
    0.1 mM EDTA
    50% Glycerol
    0.5% Tween® 20
    0.5% IGEPAL® CA-630
    pH 7.4 @ 25°C

    Heat Inactivation


    5' - 3' Exonuclease


    3' - 5' Exonuclease


    Strand Displacement


    Resulting Ends

    • Mix of blunt and Single-base 3´ Overhangs

    Unit Assay Conditions

    1X ThermoPol® Reaction Buffer, 200 µM dNTPs including [3H]-dTTP and 200 µg/ml activated Calf Thymus DNA. 

    Quality Control

    Quality Control Assays

    The following Quality Control Tests are performed on each new lot and meet the specifications designated for the product. Individual lot data can be found on the Product Summary Sheet/Datacard or Manual which can be found in the Supporting Documents section of this page.
    • PCR Amplification (Master Mix):
      The polymerase is tested in a polymerase chain reaction (PCR) using a control template and specific primers, resulting in the expected product.


    1. 5'→3' flap endonuclease destroys displaced strand.


    1. Barnes, W.M. (1994). Proc. Natl. Acad. Sci. 91, 2216-2220.
    2. Saiki R.K. et al. (1985). Science. 230, 1350-1354.
    3. Powell, L.M. et al. (1987). Cell. 50, 831-840.
    4. Sun, Y., Hegamyer, G. and Colburn, N. (1993). Biotechniques . 15, 372-374.
    5. Sarkar, G., Kapelner, S. and Sommer, S.S. (1990). Nucleic Acids Res.. 18, 7465.

    Supporting Documents

    Material Safety Datasheets

    The following is a list of Material Safety Data Sheets (MSDS) that apply to this product to help you use it safely. The following file naming structure is used to name these document files: [Product Name] MSDS. For international versions please contact us at info@neb.com.


    The Product Summary Sheet, or Data Card, includes details for how to use the product, as well as details of its formulation and quality controls. The following file naming structure is used to name the majority of these document files: [Catalog Number]Datasheet-Lot[Lot Number]. For those product lots not listed below, please contact NEB at info@neb.com or fill out the Technical Support Form for appropriate document.
    1. What are the advantages or disadvantages of Crimson LongAmp™ Taq DNA Polymerase?
    2. How do I remove the dye from my PCR reactions using Crimson LongAmp™ Taq DNA Polymerase?
    3. What is the recommended enzyme amount when using Crimson LongAmp™ Taq DNA Polymerase?
    4. Can the extension step be carried out at 72°C when using Crimson LongAmp™ Taq DNA Polymerase?
    5. What is the extension rate when using Crimson LongAmp™ Taq DNA Polymerase?
    6. What type of DNA ends result from a primer extension reaction or a PCR using Crimson LongAmp™ Taq DNA Polymerase?
    7. Can Crimson LongAmp™ Taq DNA Polymerase be used to amplify GC-rich amplicons?
    8. Why is the product a smear when visualized on an agarose gel?
    1. PCR Protocol for Crimson LongAmp™ Taq DNA Polymerase (M0326)

    Selection Tools

    Usage Guidelines & Tips

    Troubleshooting Guides

    Interactive Tools

    Using an extension temperature of 65°C is recommended with the LongAmp Taq DNA Polymerase.