An extraction cycle was defined as the combination of phases of radiation and phases without radiation in which the solvent cooled. The sum of radiation exposure of processing extraction cycles served as the overall intensity of microwave radiation. The extraction solution was agitated with an air pump to promote heat uniformity while exposing to microwave radiation. After the radiation, the flask was taken out to weigh the total mass again, and the lost weight was supplemented. The extract was filtered through 0.45μm millipore filter, and then abandoned the initial filtrate, added 0.5mL subsequent filtrate to a 10mL volumetric flask with anhydrous ethanol as the test sample