Freeze dried food means:the moisture of food sublimate from solid phase to gas phase directly, make food dewatering and drying, finally become dried food/ fruit / vegetables,etc. These are also named as freeze dried food.
1.The advantages of freeze dried food, freeze dried fruit & vegetables:
1)Storage period - Most of moisture of freeze dried food is dehydrated, ordinary moisture content is between 1.0% ~ 2.0%. Under normal temperature, freeze dried food could store 2 years, if use ferric jar to package,could store longer time.
2)Special flavour - The volatility aroma ingredient of food loss much more little than using hot air drying process.Mincing food will loss more volatility aroma ingredient than the food which has keep a certain tissue thickness when freeze drying.
3)Color - Product has small oxygen influence, all kinds of ski reaction will not happen, so will not occur the phenomenons such as food brown stain and colour fading. During freeze drying, food may occur non enzymatic browning, brown stain speed is decided by the drying temperature and the moisture left in food.
In general, the color of freeze dried food is much better than other drying process.
4)Volume and weight - Dehydration appears as cellular structure, the superficial area of tissue enlarge about 100-150 times than original. So freeze dried food volume and weight is very small, most is less than 1.
5)Mouthfeel - As original structure of food has some change after freeze drying, so mouthfeel also has some change, VC is about at 10%~50%, B1 is at 30%,etc.
2. Range of freeze dried food freeze dried fruit & vegetables:
Each kind of food all could be freeze dried, but as the production cost of freeze dried food is expensive, so now freeze drying process is mainly used for luxury food, let's see the below freeze dried food classification together:
1) Freeze dried fruit & Freeze dried vegetables: freeze dried strawberries, vacuum freeze dried jackfruit, pineapple, apple, juicy peach, tomato, carrot, green onion, garlic, etc.
2) Freeze dried meat / poultry products: pork, beef, chicken, rabbit meat, etc.
3) Freeze dried aquatic product / marine product: shrimp, fish, trepang, dried scallop, kelp, laminaria japonica, nori, etc.
4) Freeze dried seasoning: jam, soup bases, regulate material, spice, etc.
5) Freeze dried convenient food and others: space navigation food, military food,tourist food,tea,coffee, etc.
3. The production equipment of freeze dried food freeze dried fruit & vegetables:
1㎡ ~5㎡ small type food freeze drying equipment, also named in-situ vacuum freeze dryer, most use in-situ contact type drying method.
Over 10㎡ industrial vaccum freeze dryer, most use radiate separation type freeze drying method, drying chamber and subzero storage usually use rail or trolley to contact.
Freeze drying process used in freeze dried food,freeze dried fruit, freeze dried vegetables, freeze dried pharmaceutical industry,etc,TOPTION has more than 10 years technology development, ISO & CE certification, provide professional freeze dryer customization according your production process, learn more welcome contact TOPTION specialist team directly: salesj@toptionlab.com