The invention discloses an efficient preparation and purification method of active pharmaceutical ingredients in
rhaponticum uniflorum. The method comprises the steps of pretreatment of raw materials in the flowering stage, vacuum low-temperature countercurrent extraction, membrane
coupling purification, resin-
crystal combined refining and
active ingredient activation. In the pretreatment, ventilating and
drying at 40-50 DEG C until the
water content is less than or equal to 8%, crushing and sieving with a 40-60-mesh
sieve Carrying out dynamic countercurrent extraction in a three-stage series device by using gradient
ethanol under the conditions that the temperature is 45 + / -2 DEG C and the pressure is-0.08 to-0.1 MPa; the preparation method comprises the following steps: carrying out
microfiltration with a 0.22 [mu] m
ceramic membrane and concentration with a 1000Da
ultrafiltration membrane, carrying out
gradient elution with an HPD-100 resin column, adding a linarin-spinosin (3: 1)
seed crystal, crystallizing at 4 DEG C, and finally freeze-
drying and activating. According to the present invention, the obtained
active component total flavone content is more than or equal to 85%, the
iridoid retention rate is more than or equal to 95%, the Nrf2 pathway activation EC50 is less than or equal to 0.12 mg / mL, the APAP
liver injury mouse serum ALT is reduced by 55-70% due to the dosage of 80 mg / kg, the
active component can be prepared into the enteric
capsule for treating the
drug-induced
liver injury, and the problems of component degradation, low purity and short resin life in the prior art are effectively solved.