I. Extra tip.

Extra tips are specially planned for extra samples or extra applications. There are the following categories: the first category is the gel tip (also known as point sample tip): tip or flat or very thin, mainly used for electrophoresis test; the second category is a wide-mouth tip: tip caliber is larger than the general tip, mainly used to remove proteins and other large molecules of solution; the third category is a low adsorption tip: the inner wall of this type of tip after special treatment to reduce the surface of the adsorption force can be used to remove viscous liquids; the fourth category is a longer tip: mainly used in volumetric flasks and other containers to take liquid; the fifth category is an external pipette. The fourth category is the elongated tip: mainly used in volumetric flasks and other containers to take liquid; the fifth category is the external piston tip: mainly used for external piston pipette and continuous dispenser and other extra pipettes.

Pipette tip suitability.

Pipette tip adaptability is a point that users are now focusing on more and more, why? Because not all the tips can be used in arbitrary brand corresponding range of pipettes, so Leibe once again prompted us to users in the purchase of tips must pay attention to the adaptability of the tips. First of all, we can understand the adaptability of the pipette tips from the following aspects: First of all, the specialization of the pipette tips. Some brands of certain series of pipettes can only use its own standard pipette tips, other tips can not be used. For example, Rainin's multichannel pipettes must be used with its own LTS tips; secondly, the degree of tip adaptability: It is common for a pipette to be used with a wide range of tips, but the effect of pipetting with different tips is different. In general, the standard tips are still good, but some brands of tips are also good, such as Axygen's tips. Third, the pipette tip and pipette volume should be matched. Generally, the volume of the tip should be greater than or equal to the Z-volume range of the pipette, for example, a 200ul tip can be used for Z-volume ranges of 20ul, 100ul, and 200ul; fourth, the specialization of the tips for large-volume pipettes (5ml, 10ml, and 20ml). All major pipette brands of large-range pipettes generally require the use of their standard tips, and it is more difficult to find alternatives. Therefore, assuming that we need to acquire tips, we recommend that we tell the supplier the type of tip we are using or at least the brand and range of the pipette we are using.

Biological contamination.

Nowadays, more and more users are asking for pipette tips that are free of RNAase, DNAase, DNA, pyrogen and ATP contamination. This is a good scene, but Leibe had to prompt two more points: first, autoclaved tips can not completely guarantee that there is no biological contamination, to ensure that there is no biological contamination also need to carry out the gamma ray treatment and other processes. Therefore, it is almost impossible for the user to process the general tips into bio-contamination-free tips, and the acquired bio-contamination-free boxed tips should be supplied with corresponding certificates, indicating the viewing data of the corresponding items. There is no data on the certificate or even no certificate of the tips, is not confirmed to be completely free of pollution; Second, bagged tips are even more unable to ensure that no biological contamination. Tips only need to contact the air will be biological contamination may be, and the general self-sealing bags can not guarantee that the tip in the storage and transportation process is not in contact with the air; in addition, self-sealing bags by the tip of the case of puncture also happens from time to time. Therefore, assuming that you have a high demand for the suction head, and then purchase must be understood to the supplier to understand the suction head is not labeled with the corresponding project to view the data of the certificate.

Fourth, with cartridge suction head.

With cartridge tip is a cartridge at the top of the tip (usually white). This cartridge is generally made of polypropylene, similar to the cigarette filter structure. Because of this cartridge, the pipetted sample cannot enter the pipette, which then protects the pipette components from contamination and corrosion, and above all ensures that there is no cross-contamination between samples. Therefore, the cartridge tip is also a primary thing for removing volatile and corrosive samples. Of course, the price of cartridge tips is relatively high compared to general tips, and the market share in China is very low. Moreover, there are very few domestic cartridge pipette tips, and its filtration effect is hardly satisfactory.