8400 bacteria in one bite? Can watermelon be eaten overnight?
Every summer, the question of whether watermelon can be eaten overnight is taken out and discussed again, and the relevant news is once rushed to the hot search. Can watermelon be eaten overnight?
Every summer, the question of whether watermelon can be eaten overnight is taken out and discussed again, and the relevant news is once rushed to the hot search.
Can you eat watermelon overnight? In fact, whether watermelon overnight is not the main problem.
The key is whether there are pathogenic bacteria. A good, whole watermelon is essentially sterile inside. However, the cut watermelon is not protected by the skin. Even if it is refrigerated in the refrigerator, the number of colonies will still rise. This is a very normal natural phenomenon.
Scientists carried out experiments on cut watermelons: with special cutting boards and kitchen knives, the refrigerator was refrigerated and wrapped with plastic wrap for 24 hours. The experimental results showed that only 45 bacteria were detected in every 25g of watermelons. However, when the staff switched to a meat cutting board and a knife to cut watermelons (stored for 24 hours), the experimental results showed that 8400 bacteria were detected in every 25g of watermelons! (The small plait who never changes cutting boards and knives when cutting watermelons thumped in his heart)
Studies have shown that if you use clean knives, cutting boards to cut melons, and wrap them in clean plastic wrap and put them in the refrigerator in time, it is not easy to have pathogenic bacteria, and you can eat them with confidence even if you put them overnight.
Why do you sometimes have diarrhea after eating watermelon overnight? In fact, this is caused by a large number of "pathogenic bacteria. Whether it will cause harm to the human body, the key depends on whether there are pathogenic bacteria on the watermelon. Such as common salmonella, staphylococcus aureus, listeria, etc. Details
Experts said that if it is not contaminated by pathogenic bacteria, even if the surface is not cut off, it is completely safe to eat. But if it has been contaminated by pathogenic bacteria, even if you cut off the surface of the watermelon, it may still make people sick.
What is the concept of colony number 42000? After the idea of "a bite of 8400 bacteria" spread, there are also evaluation agencies to do a test, measured overnight watermelon on the total number of colonies as high as 42000 CFU/g, is not looking more scary! In fact, sometimes seemingly huge numbers may not be as terrible as we think.
Take cold drinks that are also very hot in summer as an example. The national standard limits the total number of colonies in cold drinks are as follows: the national standard stipulates that 5 different parallel samples must be taken, of which up to 2 samples can have a total number of colonies between 25000 and 100000, while the other samples must be less than 25000.
In other words, when you eat cold drinks that fully meet national standards and the factory strictly controls hygiene, the total number of colonies may exceed 42000. Now, does the total number of 42000 colonies on watermelon feel less scary?
Although bacteria are everywhere, good hygiene habits can prevent diseases from entering the mouth. In order to minimize the risk of watermelon being infected with pathogenic bacteria, please remember these:
1. Buy fresh and complete watermelons: It is recommended that you try not to buy cut watermelons, because you don't know how long they have been saved.
2, the use of clean melon cutting utensils: if the fruit knife and cutting board are contaminated by bacteria, it will also affect the quality of watermelon. It is best to use a special fruit knife and try not to mix it with a kitchen knife. Clean the knife and chopping board when cutting watermelons, and scald the knife repeatedly with boiling water before cutting watermelons.
3. Do not store at room temperature for more than 4 hours: under high temperature environment, a large number of bacteria will grow in about 6 hours, regardless of whether plastic wrap is pasted or not, and the number of bacteria will grow within 4 hours is small, so it is better to eat it now.
4, refrigerated preservation has pay attention to: in order to prevent cross-contamination of ingredients and string flavor, the use of plastic wrap is a better means. However, if there is a separate storage space for watermelons in the refrigerator, it will not cause a string of flavor and water loss, so it is not recommended to cover the plastic wrap. It is best not to refrigerate for more than 24 hours.