The invention discloses a method for extracting and purifying
flavones from plants containing
flavones, and relates to extraction of bioflavonoids. The method is used for effectively extracting and purifying
flavones from plants containing flavones, and has the advantages of simple extraction and purification process, low
energy consumption, short time, high
recovery rate of the flavones, clean and
pollution-free production process, and high product purity. The method comprises the following steps: 1, crushing the plants containing flavones, adding the obtained
plant powder into an
ethanol-water solution containing a surfactant, and immersing to obtain a mixture; 2, carrying out
microwave treatment on the mixture in a
microwave device, taking out the
microwave treated mixture, cooling to
room temperature, and carrying out reduced pressure pumping
filtration to obtain a filtrate containing flavones; 3, carrying out evaporative concentration on the filtrate containing flavones, carrying out
macro-porous resin adsorption, and eluting to obtain an eluate; and 4, carrying out evaporative concentration on the eluate to obtain a concentrate liquid, and freeze-
drying the concentrate liquid to obtain the flavones.