Comparison of Supercritical CO2 and Ultrasonic Extraction of Orange Peel Essential Oil from Albanian Moro Cultivars

The extraction efficiency of the Albanian Moro cultivar orange peel extract using supercritical CO2 (scCO2) extraction and ultrasonic extraction (USE) is studied. ScCO2 extractions were carried out at 200 atm, 40 degrees C, flow rate of 1.6 ml/min, particle size of 0.5-1 mm combined by two extraction modes. The USE were studied within a time period of 5 - 60 min applying a bath power of 10 W. CH2Cl(2) served as collecting /extracting medium in both studied methods. An essential oil yield of 0.21 % for 60 min sonication time was recorded for USE compared to 0.23 % for scCO(2) extraction when using a 15 min static extraction mode followed by a consecutive dynamic mode. Within the first 22 min, 83 % and 73 % of extract were obtained for scCO(2) extraction and USE respectively. Limonene as the major extract component varied from 89-91 % followed by beta-myrcene, decanal, alpha-pinene, linalool and valencene.