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There is a large amount of food lost every year due to improper storage in China. The food industry urgently needs advanced storage technologies. Wu Xibao, the manager of Nanjing Wanjie O&M Equipment Factory specializing in sterilization and preservation technology, believes that using ozone preservation technology can effectively improve grain quality and reduce the loss rate in the process of storing grain.
The quality of food is not only closely related to the health of consumers, but also relates to the country’s food security and social stability. Due to the over-proliferation of microorganisms and the occurrence of pests and diseases, the loss of food in storage is also a considerable number. If an objective estimate of the microbial hazards of the state's grain reserves is made, its storage loss ratio should be greater than 0.5%.
According to Wu Xiubao, an engineer of Nanjing Wanjie Ozone Electrical and Mechanical Equipment Factory, ozone has outstanding sterilization, insecticidal, and odor-eliminating effects. It has been widely used as a preferred disinfectant for GMP implementation by pharmaceutical companies. In recent years, ozone equipment has been gradually used in the food industry, especially for the improvement of the cleanliness of workshops and warehouses.
Ozone sterilization is a bacteriolytic grade, bactericidal and insecticidal thorough, rapid, broad-spectrum, no residue, almost all of the bacteria, mold, fungi and protozoa, oocysts have significant inactivation effect, and can destroy botulinum toxin. Due to the poor stability of ozone, it will soon decompose spontaneously and combine with oxygen molecules without toxic residues. Therefore, it is a pollution-free environmentally-friendly sterilizer. Ozone is a gas that quickly diffuses into the entire sterilization space, leaving no dead ends for sterilization.
In recent years, the research on the use of ozone technology and equipment in food storage has also made progress. The principle of using ozone to keep food fresh is: after the new grain is put into storage, green storage technology is used to establish a pest control system and solid storage for grain storage. The system reduces the moisture and temperature of the new grain to a safety line. At the same time, it uses the characteristics of ozone to kill harmful microorganisms, larvae and eggs in the grain, which can effectively suppress the growth and reproduction of mildew and mildew, and achieve safe storage. The purpose of grain and food security through the rotation cycle.
Warehousing experiments have shown that ozone can delay the increase of fatty acids in foods and can degrade pesticide residues in foods. During storage, no foods can be used to treat foods, so that stored foods can become a true green food.
In fact, in the process of storing grain, using ozone technology and equipment to kill insects and mold, scientists and technicians have conducted long-term explorations, but due to various reasons, the effect is not very satisfactory. Nanjing Wanjie Ozone Electromechanical Equipment Factory, on the basis of summarizing the previous research experience of other units, utilizes a high-efficiency ozone gas generating device, combined with local processing technology of grain piles, and under the actual condition of grain warehouses, treats the parts with slightly musty taste. At the same time, a variety of test insects buried in the treatment area were observed, and the grain in the treated area was sampled for quality index detection and comparative analysis. The experimental results are ideal.
For example, using an ozone device with an ozone concentration of 100-120 ppm at the outlet, a partial range of insecticidal and antifungal treatment is performed on the stored rice under the actual condition of the grain warehouse. Three days later, the corn elephants were all killed; six days later, all the grains were killed; ten days later, the red yeast rice was killed. After a one-day treatment, the odor of the slightly musty part of the grain pile was significantly eliminated. After testing the amount of bacteria and bacteria in the sample, the amount of mold in the food after 5 days of treatment has dropped from 3000/g before treatment to 45/g, and the storage fungi have also been reduced to only two kinds from typical fungi. The rate of detection decreased significantly: Aspergillus flavus decreased from 6% to 2%, Aspergillus niger from 10% to 4%, Aspergillus niger from 18%, Aspergillus niger from 4%, Penicillium spp. from 6% to zero. After measuring the quality indexes of the sample production rate, finished rice rate, yellow rice, fatty acid value, viscosity, and crack rate before treatment, at the end of treatment, and 15 days after treatment, there was no obvious evidence of accelerated deterioration.
The use of ozone technology to store grain has the following advantages: Under the conditions of actual storage, a large-scale ozone treatment of stored grain can achieve better insecticidal and mold-proof effects, especially in terms of mildew prevention; Under conditions, the use of ozone for the effective treatment of pests and mildew hazards in normal quality grain storage will not have a significant adverse effect on the quality of rice; in the ozone treatment process used in the experiment, the moisture of the rice in the treated area The decrease in content is large. Therefore, ozone can effectively kill insects and mold, and can also reduce the moisture content of high-moisture foods; the cost of using ozone storage is low.
At present, there is no other good way to preserve food, other than using low temperature and low oxygen storage. Low-temperature storage is mainly the use of winter conditions to store air-conditioning, sealed storage of food. Low-oxygen storage is mainly to inject carbon dioxide and nitrogen into the grain storehouse, so that the oxygen content in the air in the warehouse is extremely low or completely free of oxygen, so that insects and other organisms cannot breathe and die. The above two storage methods have high requirements for the closed conditions of the grain warehouse, and it is difficult for many warehouses to achieve it. To meet the requirements for sealing, the cost of warehouse reconstruction is too high. Of course, food can also be stored in mechanical refrigeration, but the cost of treatment is much higher than ozone preservation.
According to Wu Xiubao engineer of Nanjing Wanjie Ozone Electrical and Mechanical Equipment Factory, in the process of food storage, ozone equipment disinfection is used, mainly for such links: before the raw grain warehousing, sterilize the empty warehouse to prevent cross-infection; At the same time, it is combined with the transportation equipment to carry out preliminary treatment; after the food is put into storage, it is sealed to meet the national hygiene standards (about 4 days); before the food is discharged, the packaging bag is disinfected to prevent Cross-infection; keeping the air cleanliness of the packaging workshop at 10,000 can effectively improve the sanitary quality of the food filling environment. Author: Liang Qinghua Qiu Desheng
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