Terra PCR Direct Polymerase Mix contains an optimized DNA polymerase that allows for direct amplification from tissue sources or crude extracts, without the need for DNA purification. It can amplify DNA targets up to 4 kb as well as difficult templates (including those with a GC content greater than 70%)—and it enables DNA amplification in the presence of PCR inhibitors, growth serum, and other source material components.
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- Direct PCR from meat samples
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Amplifying a gene of interest from raw and processed meat samples
Terra PCR Direct outperforms other enzymes with samples containing higher levels of PCR inhibitors
Comparison with other PCR enzymes
Terra PCR Direct Polymerase demonstrates an exceptional ability to provide consistently strong amplification of a target gene (cox1) directly from crude samples—specifically, from different types of raw meat (beef, chicken, and pork) and processed meat (chicken dumplings, beef meatloaf, and roast pork)—when compared to other PCR enzymes (Takara Ex Taq hot-start version [HS] and PrimeSTAR HS, GXL, and MAX).
Terra PCR Direct Polymerase Mix (Lane 1 in each gel) provided strong amplification for all six sample types, including the raw beef sample (Panel A). Although the PrimeSTAR series of PCR enzymes (Lanes 3–6) shows good overall performance with the crude extracts in Panels B–F, none of the enzymes other than Terra are able to effectively amplify the raw beef sample (Panel A).
This experiment demonstrates that most meat extracts can be amplified by Takara Ex Taq HS and PrimeSTAR HS, GXL, and MAX DNA Polymerases, but Terra PCR Direct Polymerase Mix shows a higher tolerance to PCR inhibitors than the other enzymes, regardless of the type of sample used. Terra PCR Direct polymerase generates a strong amplification band for the cox1 gene from the crude raw beef extract, a rich source of iron, zinc, and other metal ions that can interfere with PCR reactions. The fact that the other polymerases showed little or no amplification of the raw beef sample suggests that Terra is the best choice for analyzing meat extracts, as well as other samples that contain high levels of PCR inhibitors.
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