About the Material, Adaptability, and Package of Filtered Pipette Tips
Filtered pipette tips
The pipette tip, just like the bullet of the gun, is an indispensable accessory for the pipette. The quality of the tip also has a great influence on the accuracy of pipetting, and its importance is no less than that of a pipette. For the filtered pipette tips, as the name suggests, there is a usually white filter at the top of the tip. This filter is mostly made of polypropylene, similar to the filter tip structure of cigarettes.
Due to the existence of the filter, the pipetted sample cannot enter the inside of the pipette, thereby protecting the parts of the pipette from contamination or corrosion, and more importantly, ensuring that there will be no cross-contamination between samples. Therefore, the filtered pipette tips is also an important tool for removing volatile and corrosive samples. Of course, the price of filtered pipette tips is relatively high.
Material of filtered pipette tips
At present, the pipette tips on the market are basically made of polypropylene plastic (colorless and transparent plastic with high chemical inertness and wide temperature range). However, the quality of the same polypropylene will vary greatly: high-quality tips are generally made of natural polypropylene, while cheap tips are likely to use recycled polypropylene plastic (in this case, we can at most say its main component is polypropylene).
In addition, most of the tips will add a small number of additives during the manufacturing process. Common ones are 1. Color-developing materials. Commonly known in the market as a blue tip (1000ul) and yellow tip (200ul), the corresponding color-developing material is added to polypropylene; 2. Release agent. Help the tip to be separated from the mold quickly after forming. There are no additives added, as if there are more additives, the probability of unsatisfactory chemical reactions during pipetting would be greater. However, due to the relatively high requirements for the production process, pipette tips without additives are rare in the market.
Adaptability of filtered pipette tips
Not all pipette tips can be used on any brand of pipettes of the corresponding volume, so we have to remind users to pay attention to the adaptability of the tips. In this regard, we can interpret the problem of adaptability from the following aspects:
First, the specificity of the tip. Some series of pipettes of some brands can only use their own tips, while other tips cannot be used at all.
Second, the degree of adaptation. The most common situation is that a pipette can use multiple tips, but the effect of pipetting is uneven.
Third, the adaptation of the range. Generally speaking, the maximum range of a pipette is less than or equal to the volume of the tip. For example, a pipette with a maximum range of 1000ul uses a 1000ul tip, while a 200ul tip has a larger adaptable range and can be used for the largest range. The pipettes are 20ul, 100ul, and 200ul.
Fourth, the specialty of the pipette tips for large range pipettes (5ml, 10ml, and 20ml). Large-range pipettes of various brands often require their own tips, making it difficult to find alternatives. Therefore, to purchase a tip, it is recommended that you inform the supplier of the model of the tip or at least the brand and range of the pipette you are using.
Package of filtered pipette tips
The packaging forms of the tips are mainly in bags and boxes. In relatively mature markets, boxed products account for the majority; The so-called bagging is to pack the tips in plastic ziplock bags, 500 or 1000 per bag (the number of large-range tips per bag will be much less). Most users will manually put the tip into the tip box after buying the bagged tip.
In addition, a new form of packaging has emerged in recent years, namely refills (8-plate or 10-plate tips are stacked into a tower, which can be quickly put into the tip box without touching the tips). This kind of suction head requires less storage space and greatly reduces the use of plastic, thereby achieving the goal of environmental protection.
Special tip of filtered pipette tips
The so-called special tip is a tip specially designed for special samples or special applications. There are mainly the following categories: First, gel tip (pointing tip). The tip of the tip is flat or very thin, which is mainly used for electrophoresis experiments; Second, the wide-mouth tip. The tip diameter of the tip is larger than usual, and it is mainly used to pipette protein and other macromolecular solutions; Third, low adsorption tip. The inner wall of the suction head is specially treated to reduce the surface adsorption force and is used to transfer viscous liquids; Fourth, lengthen the suction head. It is used to take liquid in containers such as volumetric flasks; Fifth, the external piston-type suction head, which is mainly used in special pipettes, such as external piston pipettes and continuous dispensers.