Extraction of Functional Components from Freeze-Dried Leaves Using Supercritical Carbon Dioxide.

(), as a material for traditional Chinese medicine, has been widely used in Asian countries, such as China, Korea, and Japan, for several centuries owing to its therapeutic effects. In this study, leaves were used as starting materials to extract functional substances using supercritical carbon dioxide (SC-CO) at pressure and temperature ranges of 20-40 MPa and 40-80 °C, respectively. The extraction process was performed in a semibatch-type system with extraction times of 15-120 min. The high-performance liquid chromatography analysis indicated that kaempferol, ferulic acid, ligustilide, and butylidenephthalide as selected functional substances were successfully extracted under these operating conditions. An operating pressure of 30 MPa with an extraction time of 60 min seems to be an appropriate pressure to extract functional components from leaves. The Hansen solubility parameter values and statistical analysis showed that SC-CO with 10% ethanol addition is a feasible tool to isolate these selected functional substances from the matrix.