Views: 253 Author: Site Editor Publish Time: 2020-11-02 Origin: Site
We generally believe that food can be sterilized as long as it is heated and cooked. In fact, this statement is not really true, because some toxins cannot be destroyed by heating, so it is important to choose the correct disinfection method. The disinfection methods and devices what we know are ozone water purifiers, ozone water disinfectants, ozone water sterilizers, etc. Today we mainly introduce the difference between high temperature disinfection and ozone disinfection.
High-temperature steam can not only kill general bacteria, fungi and other microorganisms, but also kill spores. It is the most reliable and widely used physical sterilization method.
Due to the strong permeability of steam, protein and protoplast colloids are easy to denature and solidify under humid and hot conditions, and the enzyme system is easily destroyed. Steam enters the cells and condenses into water, which can release potential heat to increase the temperature and enhance the sterilization power.
Among the various physical factors that affect the life of microorganisms, the boiling point of water rises with the increase of water vapor pressure, so as to achieve the purpose of high temperature sterilization. The heat required for boiling water is called sensible heat, and it takes about 419 kilojoules per kilogram of water to reach 100°C from 0°C. The heat required for the complete conversion of water into steamrequires approximately 2257 kilojoules per kilogram of water vapor at 100°C. Therefore, only by making full use of the latent heat can the perfect sterilization effect be obtained in a short time.
Ozone is one of the strongest available oxidants. In actual use, due to its strong oxidizing properties, ozone shows outstanding effects of sterilization, disinfection, and degradation of pesticides. It is a highly effective broad-spectrum bactericide. Ozone can oxidize and denature the protein shell of bacteria, fungi and other bacteria, and can kill bacterial propagules and spores, viruses, fungi, etc. For common Escherichia coli, Streptococcus faecalis, Staphylococcus aureus, etc., its killing rate is above 99%. Ozone can also kill hepatitis viruses, cold viruses, etc. Ozone diffuses quickly and evenly in the air.
Disadvantages: the sterilization time is longer, generally, it is about 50-60 minutes. In addition, if the surface of the items to be disinfected has water, the disinfection effect of ozone will be weakened. The ozone concentration used for disinfection is generally 10mg/m2~40mg/m2. In the working environment of the disinfection cabinet, the leakage ozone concentration does not exceed 0.3mg/m2, which is harmless to the human body, but refresh air.
Ozone is a strong oxidant, and the sterilization process is a biochemical oxidation reaction. Ozone sterilization has the following three forms.
1) Ozone can oxidize the enzymes needed to decompose glucose inside the bacteria, and inactivate and kill viruses.
2) It interacts with bacteria and viruses directly, destroy their organelles, DNA, and RNA, destroy the metabolism of bacteria, and cause the death of bacteria.
3) It penetrates the cell membrane tissue and invades into the cell, acting on the lipoprotein of the outer membrane and the lipopolysaccharide inside, causing the bacteria to undergo permeability distortion and dissolve and die.
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