Use of box-behnken design for the optimization of supercritical carbon dioxide extraction of oil from Schisandra Chinensis(Turcz.) Baill

The response surface methodology (RSM) was employed to optimize the process parameters of supercritical carbon dioxide extraction of the oil from caculis of Schisandra Chinensis(Turcz.) Baill. The effects of temperature, pressure and flow rate on the oil yield were investigated. Results showed that the data were adequately fitted into the second-order polynomial model. The linear and quadratic of independent variables, temperature, pressure and flow rate, the interactions between pressure and flow rate, temperature and flow rate had a significant effect on the oil yield. It was predicted that the optimum extraction process parameters within the experimental ranges would be the extraction temperature of 36°C and pressure of 42MPa and flow rate 17L/h. Under these conditions, the oil yield was 0.43%. The color of oil extracted by supercritical carbon dioxide is golden orange. Its physical and chemical properties come up to the required standard for edible oil.