The hottest microwave sterilization and disinfecti

Microwave sterilization and disinfection

among the conventional disinfection methods, chemical disinfection has been banned in many countries, especially when applied to food, which will pollute food and harm human health. Other conventional disinfection methods, such as hot water, steam, hot air, ultraviolet, infrared, additives, etc., are either too long or may be contaminated. The biggest advantage of microwave disinfection is no pollution and rapid. Therefore, microwave disinfection is the most ideal disinfection method

the mechanism of microwave sterilization is two-sided. It has both thermal effect sterilization and non thermal effect sterilization, so it has dual sterilization function. During microwave heating, the molecular polar groups such as protein and nucleic acid components in bacteria rotate and vibrate at high speed under the microwave field. On the one hand, heating makes bacterial protein coagulate and die. On the other hand, it can also denature proteins and nucleic acids and die. Here are some examples to illustrate the effect of microwave sterilization and preservation

Japan has a humid climate, and mildew is a major problem in food preservation. Sponge cakes are irradiated with kW microwave for 2 minutes, and the temperature rises to 70 ℃, which will not mildew in 15 days, while those without microwave treatment will mildew in 5 days

Professor Akashi of Japan put Bacillus subtilis, Escherichia coli, Penicillium flavum, Aspergillus and other microorganisms in their respective culture media. Then use microwave 2800MHz, pulse width 1 μ s. A pulse with a repetition rate of 2000Hz and a power of 2kW can be killed by irradiation for 90 seconds. The same Bacillus subtilis can only be killed with boiling water for 15 minutes

Professor Chi Xing also used 2450MHz, 5kW, 12m long conveyor belt heater to carry out the fresh-keeping test of cuttlefish. Each time, 100g acrylic bags are used, with a flow rate of 3kg. After opening the bags and microwave irradiation for 3 minutes, the universal material testing machine and pressure testing machine used by most construction engineering laboratories in Anhui Province are generally biological. The practical results show that the number of hydraulic type is reduced from 12000 to 260000 per gram to 14000 to 24000. The number of bacteria in squid stacked in the workshop is 21million per gram. After opening the bag for 3 minutes, the number of bacteria is reduced to 6100 per gram

in 1965, Olsen used 2450MHz Microwave Radiation bread to prevent mold. The production and sales of cars in China have exceeded 17million, with 65 ℃ heat preservation and radiation minutes, and it is still fresh for 21 days. It is believed that the lethal temperature of fungal spores such as Penicillium and Aspergillus is ℃, but the microwave does not reach this temperature, and the mold is still killed. The analysis shows that: one possibility is that during the bread insulation and radiation period, although the bread has not heated up, the salt solution in the mold body may have a large selective absorption of microwave, so the temperature of the mold body may be higher than the temperature of the bread and die. Another possibility is that the non thermal effect of microwave kills bacteria

there are also a large number of experimental studies on Microwave Disinfection in China. Such as ticket disinfection, food sterilization, feed disinfection, soy sauce and milk disinfection, forest pest control, etc. With the improvement of people's living standards and the increasing development of science and technology, microwave will be more and more widely used in sterilization and disinfection