Unlike hot air drying, Freeze-dried (FD) has obvious advantages of active ingredient content and composition retention. FD technology enables its products to achieve the advantages of reducing enzyme activity, inhibiting microbial growth, non-deteriorating material matrix, non-oxidizing, and less loss of nutritional factors.
Freeze Drying Uses
Freeze-dried technology has not only been widely used in the field of food processing, but also occupies an important position in the fields of Chinese herbal medicine processing and biopharmaceuticals.
1. Food processing
FD technology can process almost all agricultural products, including fruits and vegetables, such as apples, durians, peaches, strawberries, blueberries, broccoli, etc.; cereals, such as corn, beans, grains, oil crops, etc.; meat, poultry and aquatic products, such as Livestock and poultry meat, eggs, milk, etc.; seasoning foods, such as onion, ginger, garlic and other spices; beverages, such as coffee, fruit juice, vegetable juice and other solid beverages; specialty agricultural products, such as wild mushrooms, edible fungi, fungus, etc.
2. Chinese herbal medicine treatment
Due to the relatively simple processing methods of most traditional Chinese medicines, the standardization of processing technology is not high, and the overall quality needs to be improved urgently. Studies have shown that the lyophilized velvet antler material can maintain the fat-soluble components and color of velvet antler more effectively than the boiling and frying method.
The study found that the content of flavonoids, polyphenols and essential oils in the ginger leaves after freeze-dried treatment was higher than that in the shade-dried, sun-dried and drying treatments.
3. Biopharmaceuticals
Freeze-drying technology can maintain the stability of medicines and enhance the biological activity of medicines more effectively. This technology can avoid the influence of external factors during the processing of medicines, so that the activity and quality of medicinal materials can be preserved. In addition, compared with the traditional drying technology, defects such as shrinkage and damage will appear. Because the freeze-drying technology adopts the method of direct sublimation of water molecules, it will not cause excessive damage to the formation of the drug, and can meet the requirements of the biochemical structure of the drug. Protect. Since the dehydration process is carried out in a vacuum environment, the possibility of the drug being polluted by air is greatly reduced, and it is easy to store and transport.
The development and utilization of Freeze Drying processing technology plays an important role in promoting the high-quality development of the food industry.