Process for extracting lotus leaf flavone

[0018] 1. Wash with 5 kg of dried lotus leaves, air-dried and crushed to obtain lotus leaf powder;

[0019] 2. Put the lotus leaf powder into the percolation device, extract with 50-75 liters of 70%-85% ethanol, concentrate the percolate under reduced pressure to 5 liters, filter to remove the solid precipitate, and obtain a concentrated percolate;

[0020] 3. Dilute the concentrated percolate with 15-25 liters of distilled water and slowly add it to the upper end of the D140 macroporous adsorption resin column. The lower layer of the macroporous adsorption resin column contains 6-7 kg of D140 macroporous adsorption resin. Use 60-75 liters of D140 macroporous adsorption resin. Wash the macroporous adsorption resin column with distilled water, then wash the macroporous adsorption resin column with 40-60 liters of 10-15% ethanol, then wash the macroporous adsorption resin column with 40-60 liters of 40-50% ethanol, and concentrate under reduced pressure for 40-50 % Ethanol eluent to 2.