Freeze-dried durian, freeze-dried strawberries, freeze-dried coffee, and even a variety of aerospace foods... For freeze-drying, the foodies must have tried one or two. But have you really understood how to freeze? Not only can it preserve the form of food, but it also retains most of the nutrients in the ingredients, and it is also very delicious! The director spoke today, it sounds very powerful, and in fact it is very powerful, freeze-dried.
A normal male brain with an average weight of 1400 grams, but in the "Three Body III - Death forever", why is Yun Tianming's brain only 500 grams? (What is the food research institute?) The director guessed that in the vacuum low temperature environment, Yun Tianming's brain tissue quickly lost water and became a freeze-dried fruit, so 500 grams seems reasonable.
To date, we have mastered many food preservation technologies. Freeze-drying is one of the commonly used drying techniques and is regarded as the development direction of healthy food. What kind of food processing technology can keep food the most original traits and flavors? Take a look at the bananas, apples and grapes that have been lyophilized and dehydrated in the image below, which is closer to the original fruit.
Not to mention freeze-drying, I think I thought the left side is a fruit slice.
讲 Tell the truth, how to freeze the food?
Vacuum freeze-drying technology is one of the commonly used food drying technologies, also known as freeze-drying, referred to as freeze-drying. In a word, lyophilization of food is to first cool the food containing water, freeze it into a solid, and then sublimate the ice directly from the solid under vacuum conditions.
In short, lyophilization is a process of freezing → sublimation.
For food processing, the benefits of lyophilization are actually very obvious:
Control water thoroughly, prevent the growth of microorganisms and prolong the shelf life;
During the sublimation process, the substance itself is frozen in the “ice shelfâ€, so that the dried product can maintain its original character and has ideal instant solubility and rapid rehydration;
Oxidizing substances (such as vitamin C) can be effectively protected, and nutrients can be preserved intact;
Convenient storage and transportation.
The process of lyophilization of fruits and vegetables, caterpillar gummy candy and orange juice for 18 hours. Vegetables and fruits retain their original traits, the gums become less elastic, and the orange juice becomes powdery. But the important thing is, both! very! it is good! eat!
ä»€ä¹ˆæ · What kind of food can be lyophilized?
In theory, almost all water-containing foods can be lyophilized (but for foods with excessive sugar content or gum content, and foods with too low eutectic point temperatures, lyophilization is relatively difficult). In addition to vegetables and fruits, this process is also very easy to preserve dairy products, large pieces of food, and even a whole table of food.
Freeze dry ice cream.
Freeze dried eggs.
Freeze-dried coffee, in theory, retains more of the original aroma than the instant coffee extracted by high-temperature distillation.
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