Powdered plant preparation, the manner in which it is obtained, microgranules and tablets obtained from that preparation and the ways of producing them

A method of obtaining a powdered plant preparation, said method comprising:

• a) freezing a plant material to a temperature below −90° C. to obtain a frozen plant material,
• b) grinding the frozen plant material at a temperature of −150° C. to −15° C. in a vibrating mill at a frequency above 30 Hz for 1 to 15 minutes, to obtain a powdered plant material, and
• c) separating the powdered plant material to obtain a fraction with a grain size not exceeding 400 μm, wherein
• in step b) said grinding occurs in a grinding chamber cooled with liquid nitrogen at a pressure of from 0.15 to 0.25 atm.

A method of obtaining a powdered plant preparation, said method comprising:

• a) freezing a plant material to a temperature below −90° C. to obtain a frozen plant material,
• b) grinding the frozen plant material at a temperature of −150° C. to −15° C. in a vibrating mill at a frequency above 30 Hz for 1 to 15 minutes, to obtain a powdered plant material, and
• c) separating the powdered plant material to obtain a fraction with a grain size not exceeding 400 μm, wherein
• prior to said freezing, the plant material has a water content of 6% to 8%.