Freeze Dryer was used for the first time in the WWII. Where it was needed for blood and penicillin and there was no fridge for maintenance. In this device, the blood plasma contained as a powder, without a change in the properties of macromolecules and proteins and saved people on the battlefield just by adding a little water. Drugs like penicillin also had the same procedure. Since then, a variety of biological products such as enzymes, antibodies, vaccines and all kinds of medicines are dried in a freeze drying process and are delivered to consumers at high durability. In fact, many biologic manufacturers need this device to complete their production process.
One of the uses of the Freeze dryer machines is in dairy industry. With this machine, you can dry all kinds of dairy products like milk, yogurt, cheeses, camel milk, whey, ice cream and more. With this method, products last for at least 10 years without the need for a fridge, and the taste of these products is unique.
Medicinal plants and buds
One of the uses of Freeze Dryer is the drying of medicinal plants such as echinoderm, wheat grass, thyme, rosemary, mint, pune, garlic, celery, basil, lemon and so on. In this way, the effective ingredients of the plant remain unchanged, and the durability of the flavor of the product is much higher. Varieties of sprouts can also be dried with a freeze dryer. Plant buds such as wheat, alfalfa, lentils, broccoli and ... that are dry with this machine contain a living enzyme that includes the body's various nutrients and antioxidants used in the production of supplements. The buds are also delivered to the consumers in powder.
Freeze dryer usage in food industry:
Freeze dryer was used for the first time after the World War 1 in food industry to store food outside the refrigerator. Coffee was the first frozen food product, but today we can find a variety of vegetables, fruits, meat, fish and seafood, dairy products, herbs, dyes and flavors on the market.
Freeze drying food process:
In this process, first, the temperature of the foodstuff falls below the freezing point and then with the aid of a vacuum pump, the water within the foodstuff will sublimate in the form of steam. These vapors are collected on the condenser and become like ices. Finally, as the temperature rises, the residual moisture in the food material is also removed. In this process, the physical structure of the foodstuff remains intact.
The Advantages of freeze drying:
Due to the fact that in this method water will directly turns into steam from being solid, the physical structure and chemical properties of the material is maintained. The durability of freeze-dried products without any preservatives is very high and does not require a refrigerator. Also, the types of vitamins and food antioxidants remain intact. But in traditional drying methods, due to the use of high temperatures, up to 50 percent of the nutrient value is lost.
Freeze-dried food is used in the following industries:
Natural flavor and coloring
Ice cream production
Flavored dairy products
Over the past few years, Freeze Dyer has been used in pet food industry, in the United States the market for dogs freeze dried food has grown by 7.3% to $ 4.3 billion in 2014 and cat food has risen to $ 700 million. The statistics show that consumers are looking for natural foods instead of canned food. Only natural foods prepared by freeze dryers are naturally flavored and free of additives.