Standard tips are the most widely used tips at present, and common tips can be used in almost all pipetting operations, which are the most economical tip types. Filter tips are consumables designed to avoid cross-contamination and are commonly used in experiments such as molecular biology, cytology and virology. For experiments with high sensitivity requirements, or precious samples or reagents that are easy to retain, you can Choose low-retention tips to improve recovery rates. The surface of low-retention tips is hydrophobicized to reduce liquids with low surface tension and prevent more residue on the tips.

 

How to choose a good tip? This is a question that almost all users have when buying tips. Today we will take a look at this problem.

 

A good tip depends on concentricity, taper, and most importantly, suction. Let's talk about the taper first: if the tip matches the gun better it will be good, the liquid will be more accurate;

 

Concentricity: Concentricity is whether the circle between the tip of the tip and the connection point between the tip and the pipette is in the same center. If it is not the same center, it means that the concentricity is not good;

 

What is important is the adsorption of the tip: the adsorption is related to the material of the tip. If the material of the tip is not good, it will affect the accuracy of pipetting and cause a large amount of liquid to be retained or called "hanging on the wall", thus lead to pipetting errors.

 

So when purchasing a tip, you can match the pipette with the tip for performance testing. After rinsing the tip, repeat the sample addition operation several times, weighing the sample addition each time, and record the reading.

 

Calculate the accuracy and precision of the pipetting operation after converting it to volume based on the density of the test liquid.

 

Choose tips with high precision. If the precision of pipettes and tips is not good, it means that the tightness of tips and tips cannot be guaranteed, so that the results of each operation cannot be reproduced.