Dendrobium candidum vacuum freeze drying process Studies have shown: the velocity of the material pre-freezing was 1.5 ℃ / min, pre-freezing time of 8 h, the loading amount of from 5 .35 kg / m, a heating plate temperature of 50 ℃, drying chamber pressure of 20 pa, the drying time is 5 Processing was carried out under conditions of .7 h to obtain a good lyophilized product, and the lyophilization curve was obtained . Process flow of vacuum freeze drying of Dendrobium candidum 1. Pick the stems of Dendrobium officinale without pests and diseases, clean them with running water, and classify them according to the length of 1.5~2 cm . The enzyme was deactivated by hot water, and according to the preliminary test, the treatment temperature was selected to be 85 ° C, and the treatment time was 4-6 min . The greening treatment is carried out while blanching, adjusting the pH of 7.5 and preserving the crispy preparation. 2, then cool with cold water to drain the surface of the attached water. 3. Then, the stem segments of Dendrobium candidum are laid flat in the material tray, and the thickness is required to be uniform. Since the charging amount related to sublimation drying time, the charging amount of the set were 2.70, 3 .89, 5 .35, 7 .90, 9 .6 kg / m2. 4. First pre-freeze treatment, first determine the eutectic point and eutectic point of Dendrobium candidum, set the freezing temperature and time. 5. Perform sublimation drying treatment, first adjust the cold trap to a temperature of 60 ° C, then start the vacuum pump to a vacuum of 20 Pa , and then start to give sublimation heat. 6, according to a pre-set test temperature was 55 ℃. In the following analytical drying treatment, the degree of vacuum is kept constant, and the heating temperature is appropriately lowered in order to keep the nutrient Active Ingredient of Dendrobium candidum from being destroyed by high temperature, and the high temperature of zui is allowed to be 45 ° C in the analytical drying stage . When the measured material temperature and the shelf temperature tend to coincide, it is the drying end point. The machine vacuum is removed, and the Dendrobium candidum is removed, and the polyester case is vacuum-packed in a dry and clean environment.
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