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In addition to the raw materials of the tips, most tips will also add color-developing materials and a small amount of additives during the manufacturing process. The more common ones are:
1. Chromogenic material. The blue tip (1000μL) and yellow tip (200μL) commonly known in the market are made of polypropylene with corresponding color-developing materials. Color-developing materials require high-quality masterbatch, rather than inexpensive industrial pigments. Inexpensive industrial pigments have brought in more samples with unknown and complex components.
2. Release agent. It is mainly used to help the suction head to be separated from the mold quickly after forming. In this case, the more additives, the higher the probability that a chemical reaction may occur during pipetting. “Science” has published an article showing that the detection of oleic acid amide and DiHEMDA in the tip will affect the results of molecular biology experiments.
Therefore, high-quality tips cannot have additives. However, due to the relatively high requirements for the production process, the brand of nozzles without additives is rare in the market.
Post time: Nov-01-2021