Application Mechanism of Ozone in Cold Storage
The application of ozone in cold storage mainly has three aspects: 1. Killing microorganisms - disinfection and sterilization; 2. oxidizing various odorous inorganic or organic substances - deodorizing; 3. oxidizing metabolic products, thereby inhibiting the metabolic process.
① Killing microorganisms - disinfection and sterilization;
While freezing may kill some bacteria, some pathogenic bacteria are extremely resistant to cold temperatures and will "resurrect" once the temperature returns. Especially in the cooling room and the refrigerating room, since the temperature is suitable for the growth of low temperature bacteria, mold and yeast, the stored food will be damaged in large quantities. In this case, the use of ozone will give satisfactory results. Ozone is a gas sterilant, and its bacteriostatic and sterilizing effects are usually the combined results of physical, chemical and biological aspects. Its mechanism of action can be summarized into the following three points: a. Acting on the cell membrane, leading to an increase in the permeability of the cell membrane, outflow of intracellular substances, and deactivating the cell; b. Deactivating the enzymes necessary for cell activity. These enzymes can be either basal metabolic enzymes or very important enzymes for synthesizing cells; c. Destroy the cytoplasmic human genetic material or make it non-functional. It is generally believed that ozone kills viruses by directly destroying their RNA (ribonucleic acid) or DNA (deoxyribonucleic acid) substances. While ozone kills bacteria and mold microorganisms, ozone first acts on the cell membrane, causing damage to the composition of the cell membrane, causing metabolic disorders and inhibiting its growth. Ozone continues to penetrate and destroy the tissue within the membrane until death.
②Oxidation of various odorous inorganic or organic substances - deodorization;
Ozone itself has a special smell. The use of ozone to remove ozone does not cover other odors with the smell of ozone, but mainly uses the strong oxidizing power of ozone. The main components of ozone smell are amine R3N, cyanide sulfide H2S, methyl mercaptan CH3SH dimethyl sulfide CH3SCH3, dimethyl disulfide CH3-S-S-CH3 and so on.
③ Oxidation of metabolic products, thereby inhibiting the metabolic process.
During the storage of fruits and vegetables in cold storage, ethylene will be produced. It will affect other fruits and vegetables and make them further mature. This process begins with browning of the skin, softness of the flesh, and eventual rotting. The use of ozone can oxidize ethylene into CO2 and water. While the ozone generator produces ozone, it also produces a large amount of negative ions, which also have the effect of inhibiting the metabolism of fruits and vegetables.