冷冻干燥技术是将含水物质在低温下冻结,而后使其中的水分在真空状态下直接升华。这样干燥后的物质,其物理、化学和生物性状基本不变,物质中的挥发性成分和营养成分损失很小,避免了生物制品的受热变性。冻干后的物质呈多孔状,其体积与冻干前 Freeze-drying technology is to freeze the water-containing substance at a low temperature, and then sublimate the water therein under vacuum. Such dried material, the physical, chemical and biological properties of the same basic material volatile substances and nutrients loss is small, to avoid the heat denaturation of biological products. Lyophilized material was porous, its volume and freeze-dried before