| Microwave technology was applied to pretreat peony seed, then peony seed oil was extracted by supercritical CO2 so as to realize efficient extraction of peony seed oil by supercritical CO2 technology. Fixing the microwave power 800 W, the optimal microwave pretreatment conditions were obtained by orthogonal experiment as follows: microwave pretreatment time 40 s, particle size of peony seed powder 100 meshes, moisture content of peony seed 6.2%. The supercritical CO2 extraction process was optimized by response surface methodology as follows: flow rate of CO2 25 kg/h, extraction pressure 33 MPa, extraction temperature 40℃, extraction time 100 min. Under the optimal conditions, the extraction rate of peony seed oil reached 9855%. Compared with the peony seed oil extracted by supercritical CO2 without microwave pretreatment, the moisture and volatile matter content of the peony seed oil extracted by micromave pretreatment-supercritical CO2 reduced, while the acid value and peroxide value increased. |
