2.3.1.4 Supercritical CO2 extraction (SCE)
Extraction was carried out using a pilot scale extractor (ENSIC, LRGP, Nancy, France) with supercritical CO2 as a solvent and a maximal pressure of 250 bar. Five grams of C. sinensis peel powder were placed in a 50 ml extraction vessel. 80% of aqueous ethanol was chosen as a modifier. Extraction was carried out for 30 min at 35–80 °C and a pressure of 10–22 MPa. The CO2 flow rate was kept at approximately 15 g/min by adjusting the outlet valve manually.