The invention belongs to the technical field of
nattokinase, and particularly discloses
nattokinase powder based on
superfine grinding of natto as well as a preparation method and application thereof, and the preparation method comprises the following steps: S1, uniformly mixing natto and a protective agent, spreading the mixture in a container, and pre-freezing for 2-24 hours to obtain pretreated natto; s2, transferring the natto into a freeze dryer, and sequentially performing normal-pressure cooling, vacuum heating and normal-pressure heating treatment to obtain freeze-dried natto; s3, transferring the anti-
caking agent and the freeze-dried natto into a
crusher, crushing and sieving to obtain crude natto
powder; and S4, transferring the crude natto
powder to a
jet mill, and performing crushing, sieving and packaging to obtain the
nattokinase powder. According to the nattokinase powder based on
superfine grinding of natto as well as the preparation method and the application of the nattokinase powder, the specific surface area is increased, so that surface active groups are exposed, the adsorbability and the
solubility are enhanced, the eating feeling of a beverage is improved, and the
absorption rate of nattokinase is further increased after the beverage is eaten.