Optimization of utrasonic-assised extraction process for pigment from castor by response surface extraction

Response surface methodology was used to optimize the ultrasonic-assisted extraction of pigment from castor with the yield as investigation index. Based on the single-factor tests,the center combination experiment was established with three key factors of ethanol concentration extraction temperature and extraction time. The results showed that the optimal extraction conditions were as follows:94% ethanol concentration,56℃extraction temperature and 104min extraction time. Under this condition,the extraction rate of pigment from Castor was up to 85.97%.