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Sterilization methods and comparison


Microwave sterilization method is one of the most commonly used sterilization methods we have seen.

Microwave sterilization method is one of the most commonly used sterilization methods we have seen. In addition, our common sterilization methods include: pasteurization, high temperature sterilization, ultra-high temperature sterilization, infrared sterilization, ultraviolet sterilization, high pressure sterilization, radiation According to sterilization, etc.


Among them, pasteurization equipment and high-temperature sterilization pot are relatively old food sterilization equipment, which are widely used in food production. Pasteurization, high temperature, ultra-high temperature, etc. are all sterilized by heat, so a higher temperature is required. Because each The heat transfer properties of products are different. When sterilizing by heat, the center temperature of products with good thermal conductivity rises quickly, the sterilization time is short, and the taste of the products after sterilization does not change much. For products with large volume and poor heat transfer properties, sterilization For a long time, the taste of products rich in fragrance will change greatly.


Infrared sterilization and ultraviolet sterilization belong to radiation sterilization. When sterilizing, radiation sterilization is carried out by infrared, ultraviolet or microwave. Since the wavelengths of infrared and ultraviolet are very short, they can almost only stay on the surface layer of objects, and there are few thermal effects. Therefore, infrared and ultraviolet UV is only suitable for sterilization of the outer layer of the product.


Microwave sterilization is the result of the joint action of the thermal effect and biological effect of the electromagnetic field. The thermal effect of microwaves on bacteria is to denature proteins, causing bacteria to lose the conditions for nutrition, reproduction and survival and die. Microwaves have longer wavelengths than other electromagnetic waves used for radiant heating, such as infrared rays and far infrared rays, so they have stronger penetration. Therefore, microwave sterilization is more thorough in overall sterilization than infrared and ultraviolet.


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