The invention provides a preparation method of a pine needle-radix astragali particle.
Polymer is used to wrap pine needle-radix astragali
powder so as to isolate pine needle-radix astragali
powder from the external environment to prevent water absorption. The preparation method comprises following steps:
grinding pine needles, sieving pine needle
powder by a 40-mesh
sieve,
drying pine needle powder in a baking oven with a temperature of 70 DEG C until the weight is constant; subjecting radix astragali to ultrafine
grinding to obtain
fine powder with a size of 200 meshes; mixing pine needle powder and radix astragali powder according to a weight ratio of 1:2 to obtain pine needle-radix astragali powder; adding water, wherein the weight ratio of pine needle-radix astragali powder to water is 1:5-8, stirring until the solution becomes thick; allowing the solution to stand still for 1 hour, carrying out extraction for two hours under heating at a temperature of 100 DEG C, and then concentrating the extract to a
relative density of 1.3-1.6 to obtain pine needle-radix astragali powder extract. The pine needle-radix astragali powder extract is coated by following steps: mixing needle-radix astragali powder extract,
dextrin, and
starch according to a weight ratio of 0.8-1.2: 0.5-1.0: 1.5-2.5; placing the mixture in a granulating
machine, carrying out bottom-spraying to produce particles; during the granulating process, carrying out
coating to obtain coated pine needle-radix astragali particles, wherein the
coating agent is an
acrylic resin solution with a concentration of 5%. Thegranulating-
coating technology is characterized in that the air inlet level is four, the temperature of introduced air is 40 to 50 DEG C; the temperature of discharged air is 30 to 40 DEG C; the atomizing pressure is 1.6 to 1.8 bar, the
diameter of the
nozzle is 1.0 mm, and the liquid spraying speed is 3-4 mL / min.