Method for preparing vacuum freeze-dried rose

The vacuum bio-drying effect of the dried rose flower active ingredient is minimally destroyed, the shape is well preserved, the nutrients and active substances of the rose are preserved, the water content is low, and the sugar content is high. The color is rosy, crystal clear, easy to transport and long-term storage.

The preparation method of vacuum freeze-dried rose is as follows:

a. rose picking;

b. Vacuum freeze-drying: vacuuming to 15 kPa to 25 kPa, and simultaneously starting cooling, reducing the cold trap temperature of the vacuum freeze dryer to -40 ° C to -65 ° C in 2 to 4 hours, maintaining time 0.5 to 2 hours; The rose is warmed to 0-15 °C within 9 to 30 hours to dry the rose flower.