Attention to the purchase and use of pipette tips for medical laboratory consumables

　　Medical laboratory consumables Pipette tips are indispensable and important experimental consumables in the laboratory. Most experiments will have a pipetting link, and in the pipetting process, whether using a manual pipette or an automated pipetting workstation, pipette tips are indispensable.

　　However, as the most basic experimental consumables, pipette tips have many points that need attention in the process of purchasing and using. Let's see if you have paid attention to the following points?

　　1. Selection and selection of suction heads

　　First of all, in terms of materials, the pipette tips currently on the market are basically made of polypropylene plastic, referred to as PP, which is a colorless and transparent plastic with high chemical inertness and a wide temperature range. However, the same polypropylene will have a big difference in quality: high-quality suction heads are generally made of natural polypropylene, while cheap suction heads are likely to use recycled polypropylene plastic, also known as recycled PP , in this case, we can only say that its main component is polypropylene.

　　In terms of specifications, in order to ensure better accuracy and precision, it is recommended that the pipetting volume be within the range of 35%-100% of the tip's volume. Finally, pay attention to whether your experiment requires low adsorption, filter or conductive tips to determine the accuracy of the experiment.

　　2. Attention to the use of the suction head

　　When the pipette tip is used, the immersion angle of the tip should be controlled within 20 degrees, and it is better to keep it vertical.

　　For samples at room temperature, tip rinsing can help improve accuracy; but for high-temperature or low-temperature samples, tip rinsing will reduce operational accuracy, so users should pay special attention.

　　The pipetting operation should maintain a smooth and appropriate aspiration speed; too fast aspiration speed will easily cause the sample to enter the sleeve handle, causing damage to the piston and sealing ring and cross-contamination of the sample.