The invention discloses a method for directly extracting
tectorigenin from lobed kudzuvine flowers. The method includes the steps: first, crushing the lobed kudzuvine flowers, sieving the lobed kudzuvine flowers by a 60-mesh
sieve, weighing lobed kudzuvine flower
powder, adding the
powder into
hydrochloric acid solution with the concentration of 0.1-2.0mol / L, placing the solution into a thermostatic water bath, performing
hydrolysis for 2-6 hours, setting
hydrolysis temperature to range from 50 DEG C to 90 DEG C and centrifuging the solution after
hydrolysis to obtain lower precipitates; second, washing the precipitates with
distilled water to be neutral, adding 200mL of 85%
ethanol solution, performing extraction for 2 hours at the temperature of 60 DEG C and centrifugally abandoning thelower precipitates to obtain supernatant extracting solution; performing cryoprecipitation on the supernatant extracting solution at the temperature of 4 DEG C for 4 hours and performing
centrifugation to obtain supernate; third, performing vacuum concentration on the obtained supernate to 10-20mL, adding obtained concentrated solution into 10 times of 70 DEG C
distilled water, stirring and blending the concentrated solution and the
distilled water, cooling mixture to
room temperature, performing cryoprecipitation at the temperature of 4 DEG C for 12 hours, performing
centrifugation to take precipitates, and freeze-
drying the precipitates for 36 hours to obtain extracted
powder, namely, the
tectorigenin. The
tectorigenin is directly extracted from the lobed kudzuvine flowers without tectoridin extraction steps, technologies are simple, and tectorigenin extraction rate is high.