Speaking of food safety, some people think that food with long shelf life must have used preservatives, such as canned, warm milk, instant noodles, honey and so on. In fact, the antisepsis in the food industry is not as simple as many people think, adding preservatives is OK.

 

 

 

The principle of food spoilage

 

The food we eat is nutritious, and these nutrients are also favorite foods for microorganisms such as bacteria, molds, yeasts and so on.

Microorganisms can reproduce rapidly at suitable temperatures, humidities, air and nutrients, while breaking down proteins, sugars, and fats to produce unpleasant odors, ugly appearance, unpleasant taste, which is called spoilage.

If it produces good smell, good appearance, delicious taste? It's called fermentation, such as wine making, soy sauce, fermented bean curd and so on.

Therefore, anticorrosion is actually a micro organism. Either kill or grow.

One hundred years broth of French master

 

This great master is Louis Basd. He is no ordinary cow.

Pasteurization, he invented.

Rabies vaccine developed by him.

He affects 12 of the 100 people who influence the course of human history.

The following picture is the broth he made: in 1860s, after more than 100 years, it is still not corrupt.

 

 

Do you have preservatives? Not really. What is the secret? Very simple, boil...

There are no bacteria in the boiled broth, and the bottle is sealed or designed to be inaccessible. Refuse to accept it.

In fact, there are many preservative preservative methods around us.

high-salt

Salted fish, bacon, salted duck eggs, salted vegetables and so on, because too salty (and sometimes very dry), microorganisms are difficult to survive, generally do not need to add preservatives.

 

 

 

high glucose

Most typically honey, because of its high sugar content, is difficult for microorganisms to survive and therefore does not require preservatives. The most magical thing about honey is that it has no shelf life and will not deteriorate no matter how long it takes.

However, honey can not be given to children under 1 years old because it may contain botulinum toxin.

 

 

 

Smoked

Common smoked bacon, ham, fish, etc., do not need preservatives, of course, the general smoking process and salt together to achieve anticorrosion, and the smoking process will dehydrate, further strengthening the anticorrosion effect.

 

 

 

Alcohol

Alcohol can kill bacteria, for example, some bread, small cake ingredients list there is edible alcohol, so only the media reported that "eat yolk pie, find out drunk driving."

Sufu also often contains some edible alcohol, which can inhibit the growth of microorganisms.

 

Dry

For example, instant noodles, because they are dry, microbes can not reproduce, so no preservatives are needed. Similarly, potato chips, fried rice crust, dried meat and so on.

The picture below is a packet of instant noodles. Although there are many additives, it has preservatives.

 

 

cold

Under freezing conditions, microorganisms can not grow and reproduce, so no preservatives can be added. For example, there are thickeners and emulsifiers in the ingredients. There are no preservatives.

 

 

spice

Many natural flavors have certain antiseptic and preservative effects, such as pepper, nutmeg, clove, cinnamon, garlic and so on. But in fact they often work with salt, and some argue that they don't preserve, but mask the smell of corruption.

 

 

fermentation

There are so many microbes in fermented food that they take over the territory, so it's hard for other microbes to grow and they don't need preservatives. For example, lactic acid bacteria in low-temperature yogurt, Aspergillus flavus in the mash.

 

 

sterilization

Sterilization methods are various, including high temperature and pressure, microwave, irradiation and so on, among which high temperature is the most used.

Normal-temperature milk passes through ultra-high temperature sterilization (UHT), the bacteria kill, there is no need to add preservatives (see ingredient list).

Some juice, beverage products, the use of aseptic cold filling technology, there is no need to add preservatives (see ingredients table).

Irradiation technology is also commonly used sterilization technology, the safety is actually very high, but it sounds bad.

 

 

 

See here, you should understand that there are many ways to preserve it, not necessarily with preservatives.

If you see a product that says "No Preservatives" and "No Preservatives" when you buy food in a supermarket, be sure to have a lot of heart. Because it 99% does not need preservatives or not allowed to add!