Do you want to switch to Taq enzyme premix for genetic typing and recommend a cost-effective solution?

When selecting, it is important to focus on the final concentration of Mg ² ⁺ in the 2 × premix, the quality of dNTP, and whether it contains sample dyes. The mouse genotyping template often contains crude residue, and the buffer's ability to resist inhibition is more critical than the brand. Within 0.3 yuan/rxn, find domestic brands or imported packaging with stock in Shanghai. It is recommended to run 10-20 mouse tail DNA samples first and compare the main bands and backgrounds with existing Taq samples in the same batch. Do not make a direct price decision. It is better to negotiate prices quarterly based on monthly 1000 response.

The differences between domestic and imported packaging mainly lie in inter batch stability, buffer system, and packaging storage conditions. When making an inquiry, the supplier is required to provide the COA, gel quality control chart or activity test instructions of this batch. Shanghai spot goods will give priority to local agents with sub packaging capacity to confirm that they can be returned or replaced. It is feasible to charge 0.3 yuan/rxn including tax and freight, but if the quotation is significantly lower than the market, one should be cautious of unknown sources or repeated freeze-thaw risks, and should not stockpile in large quantities.

Band smearing is not entirely caused by the enzyme. Before switching to a different master mix, it is recommended to keep the template, primers, and cycle number constant, and compare the performance of different enzyme lots. A 2× master mix containing dye mainly saves the loading step and does not necessarily correct poor specificity; if residual EDTA or proteinase K is present in the template, prioritize a master mix whose buffer has strong inhibition resistance. After arrival, aliquot and undergo 3 freeze-thaw cycles before amplification, and confirm that activity shows no significant decline before using it in batches.

When performing genotyping with a dye-containing master mix, pay attention to the dye color and electrophoretic migration position. The red dye front may interfere with the observation of small fragments, while blue or green dyes are more friendly for routine mouse tail genotyping; if genotyping is determined by electrophoresis alone, it is recommended to run the gel slightly longer to separate the target band from the dye. After purchase, aliquot into small tubes to avoid repeated freeze-thaw cycles of the entire tube, and use a fixed PCR instrument for validation to reduce instrument-to-instrument variability.