The invention discloses maca
powder with bioactivity fully reserved, and a preparation method and a preparation of the maca
powder. The maca
powder is prepared by conducting refrigerating,
freeze drying and smashing on fresh maca;
moisture content of the maca powder is below 5%; and the maca powder contains
glucosinolate accounting for 1.1-2.75wt% of the total weight of the maca powder. The preparation method comprises the processes of preparing materials, refrigerating, conducting
freeze drying, and smashing. The preparation is characterized in that the maca powder is matched with auxiliary materials accepted in the field of
pharmacy, and prepared into a tablet, power, dissolved
medicine or a
capsule. The preparation method adopts a vacuum
freeze drying technology, and the activity of
myrosinase in the maca is inhibited during the course of storage and
drying; a
hydrolysis reaction condition for
myrosinase and
glucosinolate is destroyed by
crystallization of
moisture in the maca; oxidation of
active components of the maca is reduced due to the low-temperature
drying; and characteristic substances-
glucosinolate, the bioactive components such as
protein, and other volatile components are reserved to the greatest extent.