Culture medium bottleThe initiation of microbial experiments and cell culture is the primary step, and its standardized operation directly determines the success rate of subsequent experiments - improper operation may lead to contamination of the culture medium, component failure, and even pose safety risks to experimental personnel. The core principles need to closely adhere to "aseptic control" and "operational safety", and establish a complete standardized process from preparation to closure.

Pre preparation is the foundation of sterile assurance. Before operation, it is necessary to confirm the experimental environment: the biosafety cabinet or ultra clean workbench should be disinfected with ultraviolet light for 30 minutes and ventilated for 20 minutes before operation; Experimental personnel are required to wear sterile gloves and lab coats. If it involves the cultivation of strong microorganisms, masks and goggles are also required. At the same time, check the status of the culture medium bottle: observe whether the bottle body is damaged, whether the sealing film is intact, and whether the label clearly indicates the type of culture medium, sterilization date, and expiration date. If the expiration date is exceeded or if the culture medium is cloudy or has abnormal sedimentation, it should be discarded directly without opening.

The opening operation is executed precisely in three steps. The first step is surface disinfection. Place the culture medium bottle in the center of the workbench, use sterile gauze dipped in 75% medical alcohol, and spiral wipe the surface and cap of the bottle with the bottle mouth as the center. Focus on disinfecting the connection between the bottle cap and the bottle body to avoid dust or microorganisms from entering during operation. After disinfection, wait for the complete evaporation of alcohol to prevent residual alcohol from mixing into the culture medium and affecting the growth of cells or microorganisms.

The second step is to open the bottle cap, and it is necessary to maintain the posture of "tilting the bottle mouth downwards" throughout the entire process to avoid pollutants in the air falling in when the bottle mouth is facing upwards. Hold the lower part of the bottle with one hand to fix it, and use the thumb and index finger to pinch the edge of the bottle cap with the other hand. Slowly rotate in a counterclockwise direction until the cap is loose. Do not remove it completely, keep the connection state of 1-2 turns of thread, and slowly release the pressure that may be generated inside the bottle - especially pay attention to the culture medium bottle after high-pressure sterilization. Negative pressure may form inside after high-temperature sterilization, and sudden opening can easily cause rapid influx of external air.

The third step is the secondary disinfection of the bottle mouth and the connection of the operation. After removing the bottle cap completely, immediately use sterile tweezers to pick up a new sterile gauze dipped in alcohol, quickly wipe the inside and thread of the bottle mouth, and then invert the bottle cap in the sterile operation area (with the inner surface of the bottle cap facing up to avoid contact with contamination). The opened culture medium bottles should be packaged or inoculated as soon as possible. If not in use temporarily, the bottle mouth should be wrapped with sterile sealing film and stored in a refrigerator at 4 ℃ for no more than 24 hours. The bottle mouth disinfection steps should be repeated before reuse.

Closing the operation and handling exceptions are equally crucial. After useCulture medium bottleIf it contains residual culture medium, it needs to be sterilized with chlorine containing disinfectant before disposal; If an unopened culture medium bottle is accidentally knocked over during operation, the contaminated area should be covered with disinfectant cotton, sprayed with disinfectant, and left to stand for 30 minutes before cleaning. Simultaneously establish operation records, indicating the opening time, user, and culture medium status, to provide a basis for experimental traceability.

The "correct opening" of culture medium bottles is not a simple physical opening, but a concrete operation of aseptic concept. Every detail from environmental disinfection to bottle mouth protection is an important defense line to ensure the accuracy and safety of experiments, especially in high-precision fields such as cell therapy and microbial pharmaceuticals. Standardized opening procedures are the fundamental prerequisite for reliable experimental results.