"The multifunctional ozone machine can remove pesticide residues in fruits and vegetables and decompose hormones and antibiotics in meat." This is an online slogan of ozone machine, and this selling point played by merchants has aroused many people's interest. Then-the advertisement played by the online multifunctional ozone machine not only promotes the removal of pesticide residues in fruits and vegetables, indoor clothing sterilization and disinfection, and decomposition of hormones and antibiotics in meat. It also provides a "scientific basis" for consumers: ozone dissolves in water to produce oxygen and atomic oxygen, which can easily react with various "rings" or "carbon chains" in molecular structures such as bacteria, hormones and antibiotics, so that it quickly loses its toxicity and becomes a stable compound that is harmless to human body, thus achieving the effect of efficiently degrading toxicity. In this regard, some people have doubts: Is it really reliable to decompose and eliminate hormones and antibiotics in meat? The permeability of ozone remains to be discussed. "Compared with oxygen, ozone has only one more oxygen atom, and it is this oxygen atom that gives ozone a special ability." Associate Professor Wang Shuguang of beijing university of chemical technology Institute of Chemical Technology believes that the redox potential of ozone in water is 2.07V, which is second only to fluorine (2.5V) and higher than chlorine (1.36V) commonly used in tap water purification. Because of its strong oxidation, ozone has been more and more used in the field of disinfection and sterilization in recent years. Even the treatment of organic pollutants, wastewater and drinking water is linked to ozone, which is also known as ozone deep oxidation technology professionally. However, Wang Shuguang disagreed with the effect of ozone on hormone removal. He believes that ozone may have a certain effect on the degradation of antibiotics and hormones in meat, but the effect should be very small, "because the permeability of ozone is open to question." "Although ozone has a strong oxidizing ability, it can break some chemical bonds, but only if it has contact with compounds. Ozone has a weak ability to penetrate solids, and antibiotics and hormones are distributed in meat. Whether effective contact can be discussed. " Wang Shuguang said that for substances like meat, if ozone can't penetrate into it or it penetrates very shallowly, it won't play a big role. The view of the scientific website "Shell Net" also believes that using ozone to rupture cells can indeed drive these hormones away from meat in theory, but don't forget that a piece of meat may have thousands of cells, and ozone can only destroy several layers of cells on the surface of meat. Some hormones are attached to the cell surface, while others go deep into the cell, so it is difficult to remove those hormones inside the cell. Ozone is not a universal oxidant. "Ozone is a strong oxidant, which can generate free radicals, destroy the cell wall and cell membrane of bacteria, oxidize some enzymes inside bacteria, such as glucose oxidase, which is necessary for glucose oxidation, and directly destroy RNA, DNA, protein, lipids, polysaccharides and other macromolecules of bacteria and viruses, thus destroying their metabolism and reproduction." Wang Shuguang said that ozone can easily react with double-stranded olefin compounds to form monomer, polymerization or staggered mixture of ozonides, which can be decomposed into aldehydes and acids. Ozone can also react with aromatic compounds, such as naphthalene, phenanthrene and anthracene. "However, the problem still exists. Although ozone is a strong oxidant, it is not a universal oxidant. In the face of a wide variety of antibiotics and hormones, it is also debatable to what extent ozone can degrade these compounds. " Wang Shuguang thinks that the direct reaction speed of ozone with saturated organic compounds and other organic compounds except phenolic hydroxyl groups is very slow. "In the process of ozone oxidation, there are many factors. The concentration of oxidant, temperature, inorganic carbon, organic carbon and other substances will all affect the reaction of ozone oxidation to remove organic matter." Regarding the behavior and slogan of the merchants, Wang Shuguang said: "It is unrealistic to use ozone to remove antibiotics and hormones from meat. I think it's a gimmick of business hype. In addition, judging from the application value of ozone reported publicly at present, many academic monographs rarely include this aspect. Professor Lin Jinming from the Department of Chemistry of Tsinghua University also said: "The bactericidal effect of ozone definitely exists. But at present, the scientific basis for removing hormones from meat is not sufficient, and it is difficult to achieve in principle. "Precautions for the use of ozone machine Because of its sterilization function, ozone machine is widely used, such as water purification of ornamental fish culture, cleaning of vegetables and fruits, disinfection and sterilization of tableware, purification of industrial sewage and air, etc. But at the same time, we should pay attention to some risks. According to the "Shell Network" news, a study by Zhejiang CDC shows that ozone can make the nitrite content in water exceed the standard while sterilizing. Because nitrite is highly toxic, it may produce carcinogens after high-temperature cooking, so food processing methods that produce nitrite should be avoided. As for how to avoid the generation of nitrite, there is no scientific conclusion so far. Generally speaking, the solution is to reduce the use time of ozone. In addition, because ozone destroys cells to achieve the purpose of sterilization, some consumers are worried that nutrients in fruits and vegetables after ozone cleaning will be lost or harmful by-products will be produced. Wang Shuguang said: "When used for disinfection of vegetables and fruits, the time is generally short, and the infiltration capacity is weak, so the influence in this respect is generally not considered. In addition, there is a recommended safe concentration in the application of ozone, so under normal circumstances, the side effects on fruits and vegetables should be small. " "Pay attention to the time when using the ozone machine, and be sure to be optimistic about the ozone concentration when choosing the ozone machine. If it exceeds the concentration, do not buy it. "According to the ozone standard issued by the World Health Organization in 2005, the average concentration every 8 hours is not higher than 0/00 micrograms per cubic meter/kloc.