Science and Education Publishing Chemical Engineering and Science 2328-7373 1 4 2013 12 15 Extraction of Citrus Flavonoids from Peel of Citrus Junos Using Supercritical Carbon Dioxide with Polar Solvent 87 90 EN Takuya Suetsugu Hideo Iwai Masahiro Tanaka Munehiro Hoshino Armando Quitain Mitsuru Sasaki Motonobu Goto Department of Chemical Engineering, Furo-cho, Chikusa-ku, Nagoya, Japan CES2013147 10.12691/ces-1-4-7 2012 12 12 2013 11 02 2013 12 15 Citrus juice processing residues are mainly composed of peel, juice sack and seed. The peel, especially, consists of bioactive compounds such as flavones. Supercritical carbon dioxide (SC-CO2) extraction of flavonoid was carried out at a pressure of 30 MPa and temperature ranging from 80 to 160°C. Ratio of water and ethanol as a co-solvent was varied from 0 to 100%. Flavonoids such as naringin and hesperidin have glycoside group, thus water was a good solvent for extraction of these compounds. Extraction behavior of tangeretin was quite different, the yield of tangeretin tended to increase with ethanol concentration.