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The pH value of slightly acidic electrolytic water is between 5.0 and 6.5, which is slightly acidic.It has significant germicidal effect on most bacteria and viruses, and is harmless to human body.Micro-acid electrolyzed water has broad application prospects in food processing and preservation,medical and agricultural fields.Disinfectant is used to eliminate or inhibit microbial pollution.Its principle of action is to destroy cell membrane,block bacterial intake of food and waste excretion, and inactivate its key enzymes.The ideal disinfectant should have the characteristics of wide sterilization spectrum, stable performance, not easy to be affected by various physical and chemical factors, non-corrosive to disinfected articles, no residue after disinfection, low price, convenient transportation, and mass production and supply.At present, the chemical disinfectants used in the market mainly include peracetic acid, chlorine-containing disinfectants, chlorine dioxide, ozone, ethanol and bromogeramine, etc.None of these disinfectants can fully meet the requirements of ideal disinfectants.Recent studies have shown that the new type of disinfection water micro-acid electrolytic water has the characteristics of strong sterilization ability, wide sterilization range, no pollution, no residue, safety, reliability, non-toxic and harmless to human body, no skin irritation, convenient preparation, low price, etc.Acidic electrolyzed water (AEW) is the acidic water with oxidizing capacity obtained by continuous electrolysis of water containing electrolytes through a specific electrolytic cell.It is also called acidified potential water or electrolytic oxidized water.Due to the difference of the electrolyte in the production, different kinds of acidic electrolytic water can be produced, which are mainly divided into strong acidic electrolytic water and slightly acidic electrolytic water.In 2002, Japan designated strong acidic electrolytic water and slightly acidic electrolytic water as food additives (fungicides) in the name of hypochlorite water. 
1.Application of slightly acidic electrolytic water.
1.1Sterilization effect of SLAEW on microorganisms.
In practical application, slightly acidic electrolyzed water has unique efficacy in preventing influenza A (H1N1) virus,investigated the germicidal effect of SLAEW (effective chlorine concentration 20mg/L, pH 6.0) on microorganisms.The results showed that SLAEW had germicidal effect on various bacterial propagules and influenza viruses in a short time (30s~1min); The time required for bacterial spores to reach the following indicators in the test at 20cc is 15min for sodium hypochlorite solution with effective chlorine concentration of 100mg/L, and 5min for SLAEW.In the Salmonella enteritidis killing test, under three temperatures (4 ℃, 20 ℃ and 45 ℃), SLAEW with available chlorine content of 4 mg/L acted for 2 minutes to kill Salmonella enteritidis.The rate can reach 100%.In the study of the fresh-keeping effect of SLAEW on fruits (tomatoes, raisins, bananas), we found that SLAEW has obvious killing effect on mold and bacteria that easily lead to fruit decay, and the storage days of fruits treated with SLAEW have increased.
1.2 Role of SLAEW in the field of food
The issue of food safety is a hot topic in the world today.In 2009, the "Symposium on the Application of Micro-acid Electrolytic Water in the Food Industry" was held in Shanghai.Chinese and foreign experts unanimously affirmed the excellent characteristics of micro-acid electrolyzed water with high efficiency, safety and environmental protection, and hoped that this technology could be popularized and applied in China as soon as possible.In practical application, compared with the commonly used sodium hypochlorite in the past, the micro-acid electrolyzed water has a higher sterilization effect in disinfecting fresh vegetables and cereals to be eaten.At the same time, it overcomes the shortcomings of sodium hypochlorite used in food disinfection, such as high residual chlorine, difficulty in post-use treatment, and formation of harmful substance trichloromethane that micro-acid or neutral electrolytic water with low concentration of available chlorine can effectively inhibit microbial activity.Abadias et al. There are also some reports on the storage and preservation of fruits and vegetables with acid electrolyzed water.The total number of microorganisms and the number of molds and yeasts on the surface of fruits treated with slightly acidic electrolyzed water can be effectively controlled, and the hardness and soluble solid content of fruits can be well maintained under the same temperature conditions, and the decay rate and browning index can be reduced to achieve the effect of preservation.
1.3 Application of SLAEW in medical field
The hospital has always been a concentration place for a variety of pathogenic bacteria,with high bacterial content and complex bacterial species, which is significantly different from other public places.The unsterilized ground or air in the hospital are the main vectors of bacterial transmission.Of the 41 major infectious diseases,14 are transmitted by air.At present, the main disinfection methods in domestic hospitals are ultraviolet lamp and acetic acid heating fumigation, but using ultraviolet lamp to disinfect will produce radiation, leaving a strange smell in the air after disinfection, and can only be carried out when there is no one; However, the acetic acid heating fumigation method is very irritating, leaving a sour taste after disinfection, and the same disadvantages are obvious.For example, in clinical work, 500mg/L or 1000mg/L disinfectant solution (trichloroisocyanuric acid effervescent instant tablets) is often used to wipe the treatment table for disinfection, but the disinfectant solution has strong chlorine taste, mild corrosivity, certain pollution to the environment and certain irritation to human throat and eye mucosa.We used micro-acid electrolyzed water to track the germicidal effect of the number of bacteria in the room of the school hospital.For the germicidal situation of the hospital floor, the germicidal rate of tap water is 89.5%, and the germicidal rate of micro-acid electrolyzed water is 95.7%. In hospital air: the sterilization rate of ultraviolet lamp is 42.2%, and the sterilization rate of slightly acidic electrolytic water is 50.2%. From its experimental data, it can be concluded that the slightly acidic electrolyzed water has a good application prospect in the medical field. Its own slightly acidic nature and almost no irritating smell are also conducive to the occupational protection of medical personnel [8].
1.4 Application of SLAEW in agriculture
Japan's Central Economic News reported that Japanese farmers used slightly acidic electrolyzed water for disease prevention of some crops, such as cabbage and grapes.Sterilize the pesticide free cultivated plants, spray them through the mobile spray device, and the ultra-fine water droplets can reach all parts of the vegetable leaf surface and the rear, which can effectively prevent the generation of bacteria.The results of disease prevention and harvest of vegetables in spring and summer of the year were tested to further verify the effect of bacteria control.A water spray device of slightly acidic electrolytic water shall be set at the entrance of the greenhouse to confirm the effect of sterilization on operators.This technology is not only used for crop production, but also used to prevent avian influenza in chicken farms.The research shows that, compared with chemical disinfectants (strong disinfectant powder and povidone iodine), slightly acidic electrolyzed water (pH 6.25-6.63, ORP887-924mV and ACC300mg/L) has better germicidal efficacy in spray disinfection or local spray disinfection of pig house belts, and the germicidal efficacy of walls, floors and fences reaches 91.4%-100%. It can also be used for harmless disinfection of personnel and vehicles entering and leaving the pig farm to ensure the healthy environment requirements of pig production.
1.5 Application of SLAEW in the field of preservation
Since 2009,we have cooperated with the University of Tokyo in Japan to carry out the research on the practical application effect of slightly acidic electrolytic water.In addition to the experimental research on the sterilization effect of the ground and air in the school hospital, the sterilization rate of the tableware in the canteen is 50.6% higher than that of the ordinary dishwasher, and the sterilization effect can reach 96.8%; For perishable vegetables such as leeks, spinach, tomatoes, bananas, raisins, litchi, strawberries and other fruits listed in supermarkets, the fresh-keeping effect of sunflowers, kangnaiqing, lilies and roses is 2 to 3 days more than that of untreated ones; It has good disinfection and sterilization effect on the surface of corn, spinach, barley, peas and other seeds, and also has good growth promotion effect on seed germination.
