What Is The Difference Between Freeze Dried And Dehydrated Food?
Many people treat dehydrated food and freeze-dried food as the same thing. In fact, they are quite different. Then here comes the question: what is the difference between freeze-dried and dehydrated food?
1. Difference between freeze-dried and dehydrated food — processing method
Freeze-drying is the sublimation of water and the direct change of solid state into a gaseous state. Freeze-dried food adopts the process of rapid freezing and vacuum dehydration.
While dehydration is the evaporation of water and the change of liquids into gases. The methods of dehydration include natural drying (sun drying, air drying, shade drying) and artificial drying (baking, mechanical drying, etc.).
2. Difference between freeze-dried and dehydrated food — moisture content
The main goal of food preservation is to remove moisture, so the food will not deteriorate and mold. Dehydration can remove 90-95% of water, while freeze-drying can remove 98%-99% of water. So the freeze-dried food can be preserved for a longer time.
3.Difference between freeze-dried and dehydrated food — shelf life
The water removal rate directly affects shelf life. The shelf life of dehydrated food such as dried fruits, vegetables and powder is about 15-20 years; dehydrated honey, sugar, salt, durum wheat, and oats can be extended to more than 30 years.
Freeze-dried food, as has mentioned in the previous content, has a larger water removal rate, thus having a longer shelf life. For example, freeze-dried fruits and vegetables can be stored for 25-30 years.
4.Difference between freeze-dried and dehydrated food — the content of nutrients
According to a research report from the American Health Agency, freeze-drying retains most of the vitamins and minerals. But compared with fresh fruits and vegetables, freeze-dried foods lack some vitamins, such as vitamin C. Dehydration does not change the dietary fiber or iron content. However, dehydration will break down vitamins and minerals during the preservation process, so the nutritional value is not as good as freeze-dried foods.
5. Difference between freeze-dried and dehydrated food — physical properties
The weight of freeze-dried food is much lighter than dehydrated food. And the two look quite different from their appearances. Dehydrated food is brittle and hard, while freeze-dried food will become soft immediately when placed in the mouth. Weight is another difference.
6. Difference between freeze-dried and dehydrated food — cooking methods
Dehydrated food needs to be cooked. In many cases, they also need condiments. This means it takes time to boil the food in hot water and eat it after cooling. It takes between 15 minutes and 4 hours to prepare dehydrated food. However, freeze-dried food only requires water.
Add hot or cold water and wait for about 5 minutes, then you can eat it.
7. Difference between freeze-dried and dehydrated food — price
Freeze-dried food is more expensive than dehydrated food since the vacuum freeze drying machine costs more and the process used is more complicated. Freeze-dried and dehydrated foods have their own advantages and disadvantages. If the budget is tight, dehydrated foods are obviously a better choice.
What is the difference between freeze-dried and dehydrated food? Now you should have the answer. If you want to buy a lyophilization machine, be sure to visit Hawach.