Introduction, classification and selection of laboratory culture medium sterilization filter
Medium sterilization filtration is an operation often carried out in the laboratory. There are many kinds of filtration products for this purpose on the market, including positive pressure drum type filter device, vacuum type filter or flat filter for large capacity filtration. . These different forms and structural products are not absolutely good or bad, but have different characteristics and are suitable for customers with different filtering amounts and usage environments. Below we will briefly analyze the structure and performance of these different products, as well as the suitable use of the population, in order to help customers choose.
R320A positive pressure barrel sterilization filter is the most traditional medium sterilization filtration product.
Characteristics and scope of application of positive pressure drum type sterilization filter device: Such products such as R320A stainless steel sterilization filter device are composed of an air compressor and a set of all-stainless steel drum filter. When using, it is necessary to open the top cover of the drum, pour the cover into the culture medium, and then open the air compressor, press the medium through the gas, press the filter membrane to remove the bacteria and filter. One of the major advantages of this type of product is that the filtration speed is fast, and because the gas discharged from the air compressor squeezes the filter membrane, if the air compressor is polluted, it will eventually be filtered through the filter membrane, which will not affect the filtrate of the finished product, and the safety. better. However, customers should pay attention to the internal height of their biosafety cabinets and ultra-clean workbench. These products are high in height, too short to be placed, or very inconvenient when operating liquids. This is a relatively traditional product that is currently used by a wide range of people.
The characteristics and scope of the bottle top vacuum filter: a vacuum pump with a bottle top vacuum filter. The biggest feature of the bottle top vacuum filter is that it can be directly connected to the laboratory glass reagent bottle, which is very convenient for the preservation of the filtrate. For example, the Sciencetool brand R300-500 laboratory vacuum filter consists of a small oil-free vacuum pump, a bottle-top vacuum filter funnel and a blue cap reagent bottle. The glass reagent bottles used in the laboratory are all standard specifications. Generally, the GL45 standard is adopted above 250ml (if the standard reagent bottle cap is marked with GL45), the bottle top filter funnel is designed with threaded port. It can be connected to any type of reagent bottle of different brands and capacities. After the filtration is completed, the funnel can be easily unscrewed, the reagent bottle cap is covered, and the filtrate is not poured out, which is very convenient to store. At the same time, in order to prevent the dust inside the vacuum pump from polluting the filter, R3OO-500 is equipped with a dish protector, which can prevent the filtrate from sucking into the vacuum pump and prevent the dust of the vacuum pump from contaminating the filtered filtrate. Because the bottle top filter is light and compact, it does not avoid the internal height of the biosafety cabinet and the clean bench, making it suitable for most laboratories.
Characteristics and scope of application of the flat filter system: with the peristaltic pump for sterilization filtration, the diameter of the filter is extremely large, and the effective filtration area is also increased accordingly. The amount of filtrate that can be filtered in a single time is far greater than that of the first two products. At the same time, the peristaltic pump automatically transports the liquid without manual feeding, so it saves operating time. Therefore, it is very suitable for laboratories, Chinese or production customers with large filtration volume. If the amount of filtration is too small, it is not suitable for use. The initial purchase cost is much higher than the first two types of products. In addition, due to the large diameter of the filter membrane, the filter price is also higher, and the amount of filtration is too small, which is obviously not cost-effective.
For more information on laboratory media sterilization filtration and media waste extraction, please visit the website of Shanghai Lingde Instrument Co., Ltd.
Zhuhai Mingke Electronics Technology Co., Ltd , https://www.zhmkdz-electronics.com