At the beginning of this year, the "onion can kill the cold virus" webpage is widely circulated. According to the article, an onion cut off at both ends can absorb bacteria and prevent the flu; the reason why the onion turns black in the early morning is because it absorbs the bacteria. In order to confirm this statement, there are two stories in the text that have no source. First, during the flu-ravaged period, a farmer's family was kept healthy because of the placement of onions. It was identified by a doctor under a microscope and found to have influenza bacteria on the onions. Second, a barber shop owner has achieved remarkable results by placing onions to prevent flu.
This kind of argument is widely spread. Many people with colds are also convinced of this folk "prescription". So, is the onion really amazing? of course not.
Previously, some experimental personnel had done relevant experiments. They used the method of microbiological testing in public places in the national standard. They selected 5 monitoring points in a 30 square meter room, then placed onions in the room and then monitored 5 The number of colonies at the point monitors the change in its number. The experimenter prepared three onions and, according to the online statement, cut off both ends and placed them in different positions in the room. The results showed that the average number of colonies at the five monitoring points did not decrease during the first 24 hours after the onion was placed, but increased slightly; at 48 hours, the number of colonies in the room was equal to the number of colonies when no onions were placed. It can be seen that onions do not reduce the amount of bacteria in the room.
Graphic and unrelated
Wei Jie, a physician at the Second Hospital of Ningbo City, Zhejiang Province, once said that onions have the effect of divergent and cold, because they contain oleaginous volatiles, propylene sulfide, which has a strong bactericidal effect. If you eat some onions every day, it will have a certain inhibitory effect on bacteria in the respiratory tract and intestines. But placing onions in the room has little effect on sterilization. Moreover, many flus are caused by viral infections, and onions do not inhibit the virus. Due to its bactericidal and bacteriostatic effects, in some countries and regions, essential oils are extracted from onions for use as medicines for the treatment and control of infectious diseases. However, there is no clinical study to prevent or treat influenza. Moreover, there is no evidence that onions can kill the virus. Therefore, there is no clear scientific basis for emphasizing the dependence on onion prevention or treatment of influenza.
In addition, for the phenomenon that the so-called "cut open onion turns black in the early morning", experts explained that discoloration is not a virus or pathogen, but a common chemical reaction called "enzymatic browning" occurs. Fruit and vegetable potatoes live in the "phenol oxidase", and are also rich in "polyphenols" with antioxidant effects. When these two things come together, they will oxidize and produce an "enzymatic browning" reaction. The reaction occurs on the cut onion and turns black.
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