Processing technology of freeze-drying lyophilized instant powder in asparagus
Freeze-dried instant powder of asparagus produced by freeze dryer can maintain the original nutritional content of asparagus and meet the needs of the human body. At the same time, freeze-dried asparagus does not need to add any preservatives and pigments. The development direction of nature, nutrition and return to nature has increased the utilization rate and economic benefits of asparagus.
The processing technology of freeze-drying lyophilized instant powder in asparagus is mainly as follows:
The main process flow: raw material juice extraction-conditioning-pre-freezing-vacuum freeze-drying.
(1) Juice extraction from raw materials: Juice the thawed asparagus waste material with a juicer to obtain the original asparagus juice;
(2) Preparation: Based on asparagus juice, fresh milk with a volume ratio of 6-7%, sucrose with a mass ratio of 6-7%, citric acid with a mass ratio of 0.25-0.35%, and malt paste with a mass ratio of 13-17% Stir in asparagus juice in order;
(3) Pre-freezing: Put the asparagus juice in the material tray of the freeze dryer, flatten it, and pre-freeze it in the freezer. Finally, the center temperature of the material is required to reach -20 ° C;
(4) Vacuum freeze-drying: Put the pre-frozen material into the freeze-drying chamber of a freeze-dryer, and perform low-temperature vacuum freeze-drying.