| Abstract: Taking the extraction rate of polyphenol as the optimization index, the extraction process of polyphenol from Lanzhou lily was studied. In single factor experiment, the effects of solvent type, solid-liquid ratio, solvent volume fraction, ultrasonic power, extraction temperature and pH value on the extraction rate of polyphenol were investigated. On this basis, in order to obtain the optimal extraction conditions of polyphenol from Lanzhou lily, orthogonal test was carried out on four factors including ethanol concentration, extraction temperature, pH value of extracting solution and ultrasonic power. The results showed that the optimum extraction parameters of polyphenol extractied from Lanzhou lily were as follows: ethanol concentration 80%, extraction temperature 40 ℃, pH 7, ultrasonic power 500 W, and the extraction amount of polyphenol was 100.27 mg/g. |