Pipette suction is an important part of pipette. The quality of the suction head has great influence on the precision of pipetting. So let's talk about it in detail.
1. Material:
The suction heads on the market are basically made of polypropylene plastic. High quality headers are usually made of natural polypropylene, while low cost headers are most likely made of recycled polypropylene plastic. In addition, most suction heads in the manufacturing process will also add a small number of additives, the more common additives are: a, color material; B. Release agent. We try to choose pipette suction with less additives in the selection.
2. Packaging:
The main forms of packaging are bags and boxes. Bagging means putting the suction heads in plastic ziplock bags of 500 or 1000 pieces each. Most users will buy a bag in the suction head, and then manually put the suction head into the suction box, in the process of second increase the chance of contamination of the suction head. In recent years, there has also been a supplement (8 or 10 plate head stacked into a tower, can not contact the head and quickly put the head into the head box), the head needs less storage space, reduce the use of plastic, so as to achieve the purpose of environmental protection.
So how to choose a good pipette suction? "As long as it can be mounted on the suction head is a usable suction head", this is almost all users of the universal recognition of the suitability of the suction head. This is partly true but not entirely true.
The pipette can be mounted on the suction head and pipette can indeed form a pipette system to achieve the pipette function, but is this reliable? A question mark needs to be placed here. The answer to that question requires data.
1, you may wish to match the ART pipette with the suction head after the performance test. After washing the suction head, repeat the sample adding operation several times, weigh each sample adding amount, and record the reading.
2, according to the density of the test liquid converted into volume and then calculate the accuracy and accuracy of pipette operation.
3, we want to choose a suction head with good accuracy. If the accuracy of the ART pipette and the suction is not good, it means that the seal between the suction and the ART pipette is not guaranteed, so that the results of each operation are not reproducible.
