1Pipette tipAs a common consumable in laboratories, it plays a crucial role in various experimental operations. The quality of its performance and the mastery of its usage techniques directly affect the accuracy and reliability of experimental results. There are many differences in the application of pipette tips in different experimental scenarios, so it is crucial to have a deep understanding and mastery of their application techniques.
2、 Molecular Biology Experimental Scene
（1） Experimental characteristics
Molecular biology experiments, such as nucleic acid analysis of DNA, RNA, etc., require extremely high accuracy in the distribution of trace liquids. For example, in PCR experiments, the amount of template DNA, primers, enzymes, and other reagents added needs to be precisely controlled, and any small deviation may lead to experimental failure.
（2） Application skills
Choose the appropriate suction head: Micro volume suction heads should be selected, which have high accuracy and sensitivity, and can accurately transfer liquids in experiments such as PCR and sequencing.
Operation specification: When sucking liquid, the suction head should be vertically immersed in the liquid by 2-3mm to avoid the suction head being immersed too deeply, which may compress the air and cause too much liquid to be sucked in, or insufficient immersion to suck in air and form bubbles, affecting the accuracy of volume transfer. After sucking the liquid, leave the suction head in the liquid for about 1 second, especially for viscous liquids, to prevent incomplete liquid suction.
Avoid cross contamination: Due to the extremely high purity requirements for reagents in molecular biology experiments, it is important to ensure that the pipette tip is disposable to avoid cross contamination between different reagents.
3、 Cell culture experimental scene
（1） Experimental characteristics
In cell culture experiments, it is necessary to accurately distribute culture media, drugs, and other liquids to maintain the health and stability of cell culture. Cells are highly sensitive to small changes in their growth environment, and even slight deviations in the composition of the culture medium can affect cell growth and differentiation.
（2） Application skills
Suction head adaptation: Select the appropriate suction head based on the range of the pipette to ensure the accuracy of the transfer. For large-scale pipetting operations, choose the appropriate size of suction head to ensure a tight fit between the suction head and the pipette, avoiding leakage that may cause inaccurate pipetting volume.
Moisturizing the pipette tip: Before transferring culture medium or other liquids, pre wet the inside of the pipette tip with the liquid, that is, repeatedly suck and wet the liquid several times to pre wet the pipette tip. This can improve the accuracy of pipetting and reduce the influence of residual air or impurities on the pipetting results due to the inner wall of the pipette tip.
Gentle operation: During the pipetting process, the operation should be gentle to avoid mechanical damage to the cells. Press and release the control button smoothly and consistently, rather than suddenly pressing or releasing it, to prevent liquid splashing or the formation of bubbles.
4、 Drug screening experimental scenario
（1） Experimental characteristics
In drug development, drug screening requires high-throughput testing of the activity of a large number of compounds, with high requirements for pipetting efficiency and accuracy. Multi channel suction heads can process multiple samples simultaneously, greatly accelerating the process of drug screening.
（2） Application skills
Using multiple suction heads: Multiple suction heads can absorb and distribute multiple samples at once, improving experimental efficiency. When using multiple suction heads, it is necessary to ensure that the suction heads of each channel are installed correctly and tightly connected to the pipette to ensure consistency in the amount of liquid transferred from each channel.
Pay attention to nozzle cleaning: Due to the involvement of multiple compounds in drug screening experiments, the nozzle may be contaminated. Therefore, it is necessary to regularly replace the suction head to avoid cross contamination between different compounds. At the same time, the suction head should be properly cleaned before and after the experiment, such as rinsing with distilled water.
Calibrate the pipette: Regularly calibrate the pipette to ensure its pipetting accuracy. Because in large-scale drug screening experiments, even small pipetting errors can lead to deviations in experimental results.
5、 Clinical laboratory scenario
（1） Experimental characteristics
In clinical laboratories, pipette tips are used to prepare samples for various tests such as biochemical analysis, immunoassay, etc. These test results are directly related to the diagnosis and treatment of patients, thus requiring extremely high accuracy and reliability of pipettes.
（2） Application skills
Strict quality control: Choose reliable suction head brands and products to ensure that the material and accuracy of the suction head meet the experimental requirements. Before the experiment, conduct a visual inspection of the suction head and replace it promptly if there is any damage, deformation, or other issues.
Avoid contamination: Clinical laboratory samples may contain various pathogens, so strict adherence to sterile operating procedures is necessary to prevent sample contamination. The use of a suction head with a filter can effectively prevent samples and aerosols from entering the interior of the pipette, protect the pipette, and reduce the risk of cross contamination.
Record the operation process: Detailed records of each pipetting operation, including the volume of pipetting, the model of the pipette tip, the usage time, and other information, in order to trace and analyze any problems that may arise.
6、 Analytical Chemistry Experiment Scene
（1） Experimental characteristics
In analytical chemistry experiments, suction tips are commonly used for mixing liquids or dividing liquids into different containers, such as sample preparation in liquid chromatography analysis. In these experiments, there are high requirements for the volume accuracy and purity of the liquid.
（2） Application skills
Accurate pipetting: Select a suitable range of pipettes and suction tips according to experimental requirements to ensure the accuracy of pipetting. When removing volatile or viscous liquids, special methods can be used, such as pre wetting the inside of the suction head with liquid before suctioning, or using reverse suctioning to improve the accuracy of the transfer.
Prevent residue: After draining, contact the tip of the suction head with the side of the container to ensure thorough drainage and prevent the last drop of liquid from remaining at the tip of the suction head, which may affect subsequent experimental results.
Cleaning and maintenance: After the experiment is completed, clean the suction head in a timely manner. For reusable suction tips, strict cleaning and disinfection should be carried out; For disposable suction heads, they should be handled properly according to regulations to avoid polluting the environment.
VII. Conclusion
Pipette tipHas different application techniques in different experimental scenarios. Researchers should choose suitable suction tips according to the specific requirements of the experiment, master the correct operating methods, strictly follow the experimental specifications, and ensure the accuracy and reliability of the experimental results. Meanwhile, with the continuous development of experimental technology, the performance and functionality of pipette tips are also constantly improving. Researchers should pay attention to industry trends, timely understand and master new technologies and methods, and continuously improve their experimental level.