冷冻干燥技术,是目前国际上公认的优质保鲜干燥方法.其干燥原理是利用升华原理,将含水的鲜菇预处理后,先冻结成固态,而后使其中的水分在真空条件下由固态升华成气态,以除去水分而得到香菇干制品.其工艺过程如下.1.原料预处理 这是冻冷干燥的第一步.具体分为:(1)鲜菇采摘.从菇棚里采摘 Freeze-drying technology is internationally recognized as a high-quality fresh-keeping and drying method, and its drying principle is to use the principle of sublimation to pre-treat fresh water-containing mushrooms, then freeze them to a solid state and then allow them to sublime from a solid state under vacuum Gaseous, in order to remove the moisture and get dried mushrooms. The process is as follows: 1. Raw material pretreatment This is the first freeze-dried. Specifically divided into: (1) picking fresh mushrooms