8400 bacteria in a watermelon overnight?Can I still eat it?

Author:Lilac mother Time:2022.06.29

Every summer, whether the watermelon can be eaten overnight after cutting, it will be discussed.

There is a wide range of views on the Internet that do not eat watermelon overnight. It is said that the number of bacteria on the melon overnight is hundreds of hundreds of hundreds, and there are even 8,400 bacteria that make people trembling.

Image source: network

The watermelon on the overnight watermelon is not fragrant instantly ... Can I still eat melon happily?

Image source: Lilac Life Institute

In order to eat the safety of the people, we consulted experts from food research and development and testing, and today we made all the problems of eating melon.

The total number of colonies is high

It does not mean that watermelon cannot be eaten

After the view of 8,400 bacteria was circulated, some civil evaluation agencies were also tested to test the total number of colonies on the watermelon overnight watermelon up to 42,000 CFU/G. Everyone felt very scary when he heard it!

But in fact, there are no limited regulations for colonial numbers for primary agricultural products such as watermelon. It is born in the soil and grows on the field. It is impossible to have less bacteria.

So what is the concept of the data measured 42000? Is it high?

We can refer to the state's limited standards for pre -packaged food.

CFU/G: Indicates the number of bacterial colonies in one gram of sample.

Pre -packaged food: refers to the first quantitative packaging or the food that is made in packaging materials and containers.

Image source: station Cool Hirolo

Pre -packaged foods are strictly limited by microorganisms. During the entire production process, the control of bacteria is very strict, and sanitary conditions do not know how much better than the kitchen at home.

Under this strict hygiene control, what is the criteria for their total colonies?

For example, this is the limited standard for the total number of colonies in cold drinks in the national standard:

This uses three -level sampling standards, n = 5, c = 2, m = 25000, m = 100000 (unit: CFU/G or CFU/ml).

What does that mean? The national standard regulations must take 5 different parallel samples. Among them, the total number of colonies with a maximum of 2 samples is between 25,000 and 100,000, while other samples must be less than 25,000.

Picture source: reference literature

In other words, when you eat cold drinks that fully meet national standards and strictly control the factories, the total number of colonies may be more than 42,000.

Take a cold drink just for example. If the national standards for other foods are checked, the maximum limit is generally set at about 50,000 to 100,000.

Looking at it now, does the 42,000 colonies measured on the watermelon do not feel so scary?

Moreover, the watermelon itself belongs to fresh and short -term foods, which is much more rare than the colonies of pre -packaged food.

Image source: station Cool Hirolo

The cut watermelon does not have the protection of melon skin. Even if it is refrigerated in the refrigerator, the number of colonies will still rise. And it usually rises in an index, which is a very normal natural phenomenon.

We can't be too strict with watermelon, it's just a melon.

Image source: Lilac Life Institute

In short, the total number of colonies reaches 42,000, which can only indicate that there are bacteria on the surface of the watermelon, which cannot prove that the watermelon cannot be eaten overnight.

Why did you eat overnight watermelon

Really diarrhea

This is essentially caused by a large number of pathogenic bacteria.

According to the degree of friendliness to humans, bacteria can be divided into three types. One is the probiotic that we all love, the other is a harmless and unpleasant ordinary bacteria, and the other is the abominable pathogenic bacteria.

Image source: Lilac Life Institute

The first two bacteria breed in large quantities, which may make watermelon less delicious / good -looking, but generally not let you diarrhea. However, if the pathogenic bacteria are mixed, such as Golden Portuguese, Liszer, Salmonella, etc., watermelon will be corrupted and causing our food to poison.

In other words, in the colonies of 42000 CFU/G in watermelon, if they are probiotics and no harmful bacteria, you will generally not let you diarrhea; but if you mix the pathogenic bacteria, you may let you diarrhea.

Image source: Lilac Life Institute

Okay, now we will not be scared by the number of 42000. I just want to know how the pathogen on the watermelon comes from?

We mainly talk about the three severe disaster areas.

Knife and chopping board

The knife and cutting board repeatedly exposed to various ingredients and our hands for many years, and most of them were finished when cleaning, and the bacteria were breed in large quantities.

Especially the cutting board and knife that cut raw meat is relatively high. Use them to cut watermelon, which is small and small, and the pathogenic bacteria are big!

Image source: network

refrigerator

Many people think that food is good as long as food is put in the refrigerator, but it is not.

Although the low temperature of the refrigerator can inhibit bacteria growth, it cannot kill existing bacteria. If the watermelon is stained with pathogenic bacteria before putting it in, the refrigerator is also unable to return to heaven.

In addition, the ingredients in the refrigerator are improperly separated and cross -pollution may occur. Like eggshells, it is easy to carry Salmonella. If the cooked food directly imported from cross -pollution, it may cause food poisoning.

Image source: station Cool Hirolo

plastic wrap

Those who have problems are not plastic wrap itself, but to put it in it.

Many people like to hang the plastic wrap on the wall near the cutting board so that the ingredients can be directly put in the refrigerator after handling the ingredients. Although it is convenient, the juice when cutting meat is easy to splash! The contaminated plastic wrap is clinging to the watermelon for more than ten hours ... everything bacteria breed almost.

The correct way to open watermelon

Don't be afraid! Although bacteria are everywhere, good sanitary habits can avoid disease from the mouth.

In order to minimize the risk of watermelon dyeing the pathogenic bacteria, we recommend you to do this--

Correct melon guide

Don't buy half a melon

Try not to buy half of the melon in the supermarket, the hygiene of the knife and cutting board, and the preservation conditions and time are not guaranteed.

Wash melon

Before cutting melon, you must not only wash your hands, but also wash the skin of watermelon.

Cooked separation

Cut the fruits and knives, and the cutting boards and knives with raw meat must be used separately.

Put the refrigerator as soon as possible

After the cut, the remaining part is pasted as soon as possible and put it in the refrigerator.

Pay attention to refrigerator hygiene

When storing food, the raw and cooked scores must be cleaned in time.

Pay attention to plastic wrap hygiene

Put the plastic wrap in a place away from the cut -off area to avoid splashing water.

Doing these well, watermelon overnight is also basic safe. I really feel that the bacteria on the epidermis are very response, and you can also cut the skin thinly and eat it.

Of course, if you see and smell the watermelon have obvious deterioration, you can throw it away. Just remember to buy a smaller one next time ~

Image source: station Cool Hirolo