Study on Optimized Extraction of Total Flavones fromElsholtzia ciliata Thunb.

In order to optimize the extraction process of total flavones,based on single-factor experiments the effects of ethanol concentration,extraction temperature,extraction time and solid-liquid ratio on the extraction of total flavones from E.ciliata Thunb.were studied by orthogonal experiment,with the extraction rate of total flavones as the investigation index.The results showed that the influencing order of each factor on the extraction of flavones was as follows : extraction temperatureethanol concentrationextraction timesolid-liquid ratio.The best ultrasonic extraction parameters were as follows : ethanol concentration was 55%,extraction temperature was 90℃,extraction time was 90min,solid-liquid ratio of 1∶35.Under this condition,the extraction yield of total flavones could reach 24.60mg / g DW.The research results provided theoretical basis for the industrialized production of total flavones fromE.ciliata Thunb..