Centrifugal Separation Technique for Bacterial Cultures
Release time:
2014-01-17
Overview:
Centrifuges are typically used to separate samples by centrifugation. The centrifugal separation and culture technique for bacteria is an important and fundamental procedure in bacteriological diagnosis.
In bacteriological diagnostic work, it is often necessary to isolate bacteria from the sample material and obtain pure cultures—cultures consisting of a single bacterial species. Therefore, centrifuges are commonly used to separate samples by centrifugation. The technique of separating and culturing bacteria using a centrifuge is an important and fundamental procedure in bacteriological diagnostics.
The material to be tested is inoculated into susceptible animals, allowing the pathogenic bacteria to multiply within the animal body. Subsequently, samples are collected from the animals and subjected to centrifugation to separate and isolate the desired components, which are then cultured. Certain bacteria exhibit special resistance to specific physicochemical factors; therefore, the inoculated material can be treated with physicochemical methods to kill other microorganisms while preserving the desired bacteria, which can then be isolated and cultured.
During isolation and culture procedures, strictly adhere to aseptic techniques. All instruments, media, and reagents must be sterilized and should not be exposed to air for extended periods. It is forbidden to touch the interior of sterilized containers with your hands or blow into them with your mouth.
Based on the characteristics of the potential pathogens present in the material being examined, select appropriate culture media and cultivation conditions (such as temperature and gas environment). For the initial isolation of unknown bacteria, it is best to use several different types of culture media, such as broth, blood agar, and MacConkey agar. Inoculate several tubes with each medium and incubate them separately under both aerobic and anaerobic conditions. Typically, results are observed after 24 to 78 hours; however, some pathogenic bacteria require much longer incubation periods to grow.
Generally, the test material does not require any pretreatment and can be directly inoculated onto the culture medium. When a pathogen suspected of producing spores is involved, the test material can be ground with physiological saline to prepare a 1:10 emulsion (liquid materials do not need to be diluted). The emulsion should then be placed in a water bath at 60–80°C for 20–30 minutes to kill non-spore-forming contaminating bacteria before being inoculated onto the culture medium.
The material to be tested is inoculated into susceptible animals, allowing the pathogenic bacteria to multiply within the animal body. Subsequently, samples are collected from the animals and subjected to centrifugation to separate and isolate the desired components, which are then cultured. Certain bacteria exhibit special resistance to specific physicochemical factors; therefore, the inoculated material can be treated with physicochemical methods to kill other microorganisms while preserving the desired bacteria, which can then be isolated and cultured.
During isolation and culture procedures, strictly adhere to aseptic techniques. All instruments, media, and reagents must be sterilized and should not be exposed to air for extended periods. It is forbidden to touch the interior of sterilized containers with your hands or blow into them with your mouth.
Based on the characteristics of the potential pathogens present in the material being examined, select appropriate culture media and cultivation conditions (such as temperature and gas environment). For the initial isolation of unknown bacteria, it is best to use several different types of culture media, such as broth, blood agar, and MacConkey agar. Inoculate several tubes with each medium and incubate them separately under both aerobic and anaerobic conditions. Typically, results are observed after 24 to 78 hours; however, some pathogenic bacteria require much longer incubation periods to grow.
Generally, the test material does not require any pretreatment and can be directly inoculated onto the culture medium. When a pathogen suspected of producing spores is involved, the test material can be ground with physiological saline to prepare a 1:10 emulsion (liquid materials do not need to be diluted). The emulsion should then be placed in a water bath at 60–80°C for 20–30 minutes to kill non-spore-forming contaminating bacteria before being inoculated onto the culture medium.
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