In biological experiments, aseptic operation is a key step in ensuring the accuracy and reliability of experimental results. As a commonly used liquid handling tool, the aseptic operation of bottle mouth separators is crucial in biological experiments. The following are various methods and precautions for ensuring aseptic operation of bottle mouth separators in biological experiments.

1、 Aseptic design and material selection

The design and material of the bottle mouth separator are the foundation for ensuring aseptic operation. High quality bottle mouth separators are usually made of corrosion-resistant and high-temperature resistant materials, such as polytetrafluoroethylene (PTFE) or borosilicate glass. These materials can not only withstand the erosion of chemical reagents, but also withstand high-temperature sterilization treatment, ensuring sterility during use.

For example, PTFE material has excellent chemical inertness and biocompatibility, which can effectively prevent chemical reactions between liquids and the surface of the separator, while avoiding the attachment of bacteria and microorganisms. In addition, many bottle mouth dispensers are equipped with sterile filters that can effectively block the entry of bacteria and microorganisms, further ensuring the sterility of the liquid.

2、 Preparation before aseptic operation

Before using the bottle mouth separator, strict aseptic preparation must be carried out. Firstly, the liquid separator itself needs to undergo sterilization treatment. This can be achieved through high-pressure steam sterilization (121 ℃, 15 minutes) or surface disinfection using 70% ethanol. The sterilized liquid separator should be placed in a sterile environment to avoid further contamination.

Secondly, laboratory personnel need to wear sterile gloves and lab coats to ensure sterility during the operation process. When installing the liquid separator, it should be ensured that the bottle mouth of the separator is tightly connected to the bottle mouth of the reagent bottle to prevent microorganisms in the air from entering the liquid. During the installation process, the contact between the separator and the external environment should be minimized as much as possible to reduce the risk of contamination.

3、 Aseptic control during operation

In biological experiments, the operation process of the bottle mouth separator needs to strictly follow sterile operating procedures. Firstly, the separation speed of the liquid separator should be moderate to avoid liquid splashing or aerosol generation. Excessive separation speed may lead to excessive contact between liquid and air, thereby increasing the risk of contamination. At the same time, the outlet of the liquid separator should be as close as possible to the receiving container to avoid prolonged exposure of the liquid in the air.

Secondly, frequent disassembly and assembly should be avoided during the use of the liquid separator. Each disassembly and assembly may increase the risk of contamination. If it is necessary to replace the reagent bottle, it should be ensured that the new reagent bottle has been sterilized and replaced in a sterile environment.

In addition, the sealing of the liquid separator should be regularly checked during use. If leakage is found at the bottle mouth or outlet of the liquid separator, it should be immediately stopped and sterilized again. The leaked liquid may not only lead to inaccurate experimental results, but also contaminate the experimental environment.

4、 Aseptic treatment after operation

After the biological experiment is completed, the aseptic treatment of the bottle mouth separator is equally important. Firstly, the liquid separator should be immediately removed from the reagent bottle and cleaned and disinfected. When cleaning, sterile distilled water or deionized water should be used, and tap water containing microorganisms should be avoided. The cleaned separator should be disinfected with 70% ethanol on the surface and then placed in a sterile environment to air dry naturally.

Secondly, the storage environment of the liquid separator should also be kept sterile. The liquid separator should be placed in a dedicated sterile container to avoid contact with other unsterilized items. If the liquid separator needs to be stored for a long time, it should be regularly sterilized to ensure that it remains sterile for the next use.

5、 Case analysis and precautions

In actual biological experiments, the aseptic operation of bottle mouth separators needs to be adjusted according to specific experimental requirements. For example, in cell culture experiments, aseptic operation of the separator is particularly important. Cells are highly sensitive to the environment, and any small pollution can lead to cell death or abnormal growth. Therefore, in the process of cell culture, the use of a pipette should be more cautious.

In a cell culture experiment, when the experimenter used a bottle mouth separator to add culture medium, the rapid separation speed caused the liquid to splash out and contaminate the bottle mouth of the culture bottle. As a result, the cells showed slow growth and partial death during the subsequent cultivation process. After analysis, it was found that the contaminated bottle mouth is the main cause of abnormal cell growth. Therefore, when using a bottle mouth separator, it is necessary to strictly control the separation speed and ensure that the outlet of the separator is in close contact with the bottle mouth of the culture bottle to avoid liquid splashing.

In addition, experimenters need to pay attention to the following points when using bottle mouth separators:

Regularly check the sterility of the separator: Before each use, the surface of the separator should be checked for any signs of contamination, such as stains, water stains, etc. If any abnormalities are found, sterilization treatment should be carried out again.

Avoid contact between the liquid separator and other items: During operation, the liquid separator should try to avoid contact with other unsterilized items, such as laboratory tables, notebooks, etc. If the liquid separator accidentally comes into contact with these items, it should be disinfected immediately.

Using sterile reagents: The sterile operation of the separator not only requires the separator itself to remain sterile, but also ensures that the reagents used are also sterile. Reagent bottles should be sterilized before use and opened in a sterile environment.

VI. Summary

The aseptic operation of bottle mouth separators in biological experiments is a key step in ensuring the accuracy and reliability of experimental results. By selecting appropriate sterile design and materials, conducting strict sterile preparation work, controlling the sterility during the operation process, and ensuring proper sterile treatment after operation, the risk of contamination can be effectively reduced, ensuring the smooth progress of biological experiments. Experimental personnel should strictly follow sterile operating procedures when using bottle mouth separators, and adjust them according to specific experimental needs to improve the success rate and reliability of the experiment.