The higher the alcohol concentration, the better? Can I spray directly into the air?

“The new coronavirus is afraid of alcohol and is not resistant to high temperatures. “With the relevant topics on the hot search, a time we have snapped up medical alcohol, 84 disinfection water, etc. , at home self-disinfection, but also invisibly buried the safety risks. At the moment of the outbreak, how should the correct use of medical alcohol and other disinfection products, whether the higher the alcohol concentration, the better? What else should I pay attention to? Economic Daily reporter interviewed Tao Yong, a researcher at the Institute of Microbiology of the Chinese Academy of Sciences, and Lin Baixue, an associate researcher, to answer you in detail.

The higher the alcohol concentration, the better? Can I spray directly into the air?

According to the Beijing Municipal Emergency Management Bureau recently issued on the epidemic prevention and control period of home use disinfection products safety tips, 75% ethanol, chlorine-containing disinfectants, peroxyacetic acid and other unregulated disinfection products, can effectively inactivate the virus, but at the same time has flammable, toxic, corrosion and other dangerous characteristics, if used improper storage, easily cause fire, Poisoning, burns and other safety accidents.

Why alcohol can kill antivirus

Alcohol (ethanol) is one of the most commonly used disinfectants in medicine, is the most widely used disinfectant, soluble in water, and has a certain fat-soluble. The mechanism of ethanol sterilization virus is: its fat-soluble can destroy the biofilm composed of bimolecular sofore organisms, resulting in biofilm structure and dysfunction. Higher concentrations of ethanol can disrupt the structure of the membrane “order”, thus destroying the function of the membrane, resulting in the death of “membraned” microorganisms.

Whether alcohol is in concentration, the better

The effectiveness of alcohol in disinfectants and fungicides depends on the concentration of ethanol. To kill 99.99% of bacteria, ethanol content is usually more than 60%.

The study found that ethanol solutions with concentrations above 60% had a killing effect, and concentrations of 75 to 80 percent could kill the vast majority of bacteria and endomethe viruses in seconds, but were not effective against bacterial spores. Of these, 75% of ethanol is commonly used concentration, in hospital systems, research laboratories and other places that need to be disinfected, the most widely used.

However, 95% of the high concentration of ethanol disinfection effect, but less than dilute ethanol, of which 70% to 75% is the best. This is because high concentrations of ethanol cause proteins on the surface of bacteria to condense into a layer of epidurals, which can be turned into protective effects of bacteria and prevent further alcohol infiltration. At this point, the cell becomes inactive, but does not die. Therefore, 75% ethanol is a better choice.

So is ethanol useful for the new coronavirus? The new coronavirus belongs to the beta genus of the new coronavirus, has a coating, so can be killed by ethanol.

Can medical alcohol be used in air killing

Ethanol is a widely used disinfectant in clinical practice, but since its killing depends on high concentrations, it can only be used in vitro. For example, hand disinfection and clean disinfection of surfaces. Specifically in the home disinfection process, can be 3 servings of pure ethanol plus one piece of water configured to 75% of the concentration of ethanol as the base wipe liquid, or through spraying, wipe to clean and disinfect the surface of the object.

At present, according to the World Health Organization (WHO), the Chinese Center for Disease Control and Prevention (CDC) and China’s relevant departments recommend, first recommend soap and water washing, in the absence of hand-washing materials or environment, and hand pollution, and then use ethanol wipe liquid.

Of course, it’s much easier to use ethanol to wipe your hands than to wash your hands with soap. Because ethanol evaporates quickly, there is no need to dry the hand procedure, which is convenient and reduces the contamination that may occur during drying. At the same time, another major use of ethanol-based disinfectants is to clean and disinfect the surface of an object by spraying or wiping.

It is worth noting that ethanol cannot be used for air killing and other purposes. Some people use ethanol spray to disinfect indoor air, which lacks basis and does not have the effect of killing. Moreover, high concentrations of ethanol in the air are concentrated, which can easily produce combustion phenomena and cause fires. Therefore, it is not recommended to spray ethanol on the air at home. In non-medical environments, such as non-polluting indoor spaces in our homes, it is unlikely that the air will suspend enough to cause the spread of the virus concentration, so that air disinfection is not required, only regular doors and windows are required to ventilate.

Alcohol is flammable, use need to pay attention to what

It is understood that 80% of the concentration of ethanol flash point of 19 degrees C, there is also said to be 17.5 degrees C, so the use, transportation, storage process to be very careful, no open fire and smoking. The more temperature sits above the flash point, the greater the risk of ignition. Therefore, when using ethanol, we should pay attention to avoid open fire, also should not spray too much in large areas, so as not to cause fire. Open flames and smoking must be strictly prohibited in production and storage areas.

When using ethanol, to prevent evaporation, the maximum capacity of the container in the ward should be 500 ml, the maximum capacity in the operating room is 1 liter, and loaded into a wall dispenser. In healthcare systems, leak-free pocket bottles with a capacity of up to 100 ml are recommended and distributed separately to health care providers.

84 Precautions for disinfectant

84 disinfectant is another high-efficiency disinfectant, the main component is sodium hypochlorite, the effective chlorine content of 5.5% to 6.5%, can be widely used in hotels, tourism, hospitals, food processing industry, home and other sanitary disinfection. Its disinfection principle is: sodium hypochlorite has strong oxidation, hydrolysis can produce strong oxidation of hypochloric acid, can be reductive substance oxidation, so that microorganisms eventually lose their function, can not reproduce or infect.

In 1984, The predecessor of Ditan Hospital Beijing First Infectious Disease Hospital developed a successful disinfection solution that could quickly kill all kinds of hepatitis viruses, by the Beijing Municipal Health Bureau to organize expert identification, awarded the second prize of the application results, named “84” hepatitis washes, later renamed “84 disinfection liquid.” At present, 84 disinfectants are widely used in a variety of medical equipment, cloth, walls, floors, toilets and other disinfection.

Specific ally in the use of the process, we should pay attention to: 84 disinfectant has a certain irritation and corrosion, must be diluted before use, and skin irritation, use gloves.