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                    Products > Long PCR > Long Taq Kit (P3062)

                    Long Taq Kit (P3062)


                    The system contains sufficient reagents suitable for 200 amplification reactions of 50 μl each.
                    The product has two packages, one contains bromophenol blue, and the other doesn’t. Default package contains bromophenol blue.
                    The Mix already contains 4 mM MgCl2, and we provide another 25 mM MgCl2, Which can be used to optimizing the concentration of Mg2+in your PCR system.

                    2XLong Taq Kit is a premixed, ready-to-use solution containing Long Taq DNA Polymerase, dNTPs and Reaction Buffer at optimal concentrations for efficient amplification of DNA templates by PCR. In this kit, Long Taq DNA Polymerase is stored separately from PCR reaction Mix. To prepare the final PCR, please mix the polymerase and the reaction Buffer in appropriate proportion, and then add the primers and template DNA needed. Long Taq Mix Kit contributes to highly reproducible PCR by reducing the risk of pipetting errors, miscalculation and contamination. It also contributes to higher sensitivity by adding enhancer. Using the kit in your PCR reaction results in a mix of blunt-ended and 3’-dA overhangs PCR 

                    Long taq DNA Polymerase, a combination of thermostable DNA polymerases, is a special formulation designed for amplifying large fragment. This specially formulated Long taq was shown to amplifiy long templates from λ phage genome of up to 20 kb. It is also a better choice for amplifying complex template, such as GC-rich template. Long taq is suitable as a direct replacement for ordinary Taq Polymerase in most applications. Using Long taq in your PCR reactions results in 3′-dA overhangs PCR products, which can be used in TA clone.  

                    Convenient: only primers and template are needed
                    Efficiency: simplifying the operation and saving your time 
                    Reproducible: reduce the risk of pipetting errors, miscalculation and contamination
                    The amount of polymerase is flexible and controllable.  

                    PCR for long templates of up to 40kb
                    High reproducible ,high throughput amplification reaction of complex templates
                    Generate PCR product for TA cloning

                    Unit Definition
                    One unit is defined as the amount of the enzyme required to catalyze the incorporation of 10 nM of dNTPs into an acid-insoluble form in 30 minutes at 70°C using hering sperm DNA as substrate.

                    2×Long Reaction Mix 

                    2X Long PCR buffer, 0.4mM dNTPs, 3.2 mM MgCl2, 0.02% bromophenol blue. 

                    Storage buffer
                    20 mM Tris-HCl, 1 mM DTT, 0.1 mM EDTA, 100 mM KCl, 0.5 % TW 20, 0.5 % NP 40, 50 % Glycerol

                    Basic PCR Protocol 
                    1. Add the following components to a sterile 50 μl microcentrifuge tube sitting on ice:


                    4-16 μl PCR Enhancer can be added to the reaction system of 50 μl. By reducing the dissociation temperature of DNA template and promoting the effective amplification of DNA template, PCR Enhancer can increase the sensitivity and specificity of PCR reaction.

                    2. Mix contents of tube and overlay with 50 μl of mineral or silicone oil. 
                    3. Cap tubes and centrifuge briefly to collect the contents to the bottom. 
                    4. Incubate tubes in a thermal cycler at 94°C for 3 minutes to completely denature the template. 
                    5. Perform 25-35 cycles of PCR amplification as follows:
                    6. Incubate for an additional 10 min at 72°C and maintain the reaction at 4°C. The samples can be stored at -20°C until use. 

                    Notes on cycling conditions

                    ü          Initial denaturation can be performed over an interval of 1-5 min at 95 depending on the GC content of template.

                    ü          Optimal annealing temperature is 5 lower than the melting temperature of primer-temperature DNA duplex. If nonspecific PCR products are obtained optimization of annealing temperature can be performed by increasing temperature stepwise by 1-2.

                    ü          The number of PCR cycles depends on the amount of template DNA in the reaction mix and on the expected yield of the PCR product. 25-35 cycles are usually sufficient for the majority PCR reaction. Low amounts of starting template may require 40 cycles.

                    ü          The time of the final extension step can be extended for amplicons that will be cloned into T/A vectors.

                    7. Analyze the amplification products by agarose gel electrophoresis and visualize by ethidium bromide staining. Use appropriate molecular weight standards.

                    Store all components at –20°C

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