From the last 50 years we have captured the technique behind freeze drying process. The first freeze drying process was applied on food products after second world war. freeze drying process helps us to preserve and store foods without refrigeration. First freeze dried food product was Coffee. now fruits, vegetables, dairy products, fish, herbs and food can be successfully freeze dried. The drying technology was applied to consumer food products after the end of the war. there are many advantages of freeze dried products because of most of the water was removed from the product.
Freeze drying food process called lyophilization. foods were kept on the lower temperature for the product start freezing process and then high pressure vacuum is used to remove the water from the product.
After this process removes all remaining moisture from the product it will remain same physical structure of the food and then it preserves for storage. Freeze dried products have many advantages - the food is extremely lightweight because of 98% water has been removed from Dried product. this product is useful for boaters and hikers who carry their food with them. it will preserve for long time. With freeze drying foods can be dried at low temperatures without damaging their physical structure. Freeze dried foods don’t need to be refrigerated or preserved with chemicals and can be reconstituted quickly and easily by adding water.
There are some disadvantages of freeze dried products are - freeze dried product are expensive because the equipment required for this process have large investment of money and it is time consuming process. another major disadvantage is high temperatures can cause chemical or physical changes it will change taste or texture of a food product.