Patent ID: 11865155
Assignee: BOTANIC CENTURY (BEIJING) CO. LTD.
Field: Pharmaceuticals (Chemistry)
Classification: CPC A | IPC A

Claim 18:
19. The method as claimed in claim 18, wherein:
a. prior to conducting the water or alcoholic extraction step, further comprising the step of drying the plant leaves into coarse powder, and wherein the extraction step is conducted with 5-18 folds of 0-40% of a low molecular weight alcohol per the quantity of the Morus plant leaves (w/w), and repeated up to 5 times,
b. the step of conducting the column chromatography purification step includes washing the column with 1-2 folds of water of the column volume and discarding the wash, eluting the column with 2-8 folds of 0.2-1.0N ammonia water solution of the column volume, at an elution rate of 1-3 folds of the volume of the column per hour, and collecting the eluent with a pH value of between 9.0 and 11.0, and
c. the step of concentrating and drying the extract includes pulverizing the dried extract to pass through a mesh sieve.