Supercritical CO_2 Extraction of Coriander Essential Oil. Effect of Operation Conditions on the Extract Composition

摘要

The supercritical fluid extraction (SFE) of coriander essential oil was studied using coriander (Coriandrum sativum, fam. Apiaceae) seeds ax raw material and CO_2 as solvent. The effect of operation conditions was analyzed in a series of experiments at temperatures between 40 and 50℃ and pressures between 100 and 120 bar. The colected extracts were analyzed by GC-MS and the relative composition of the essential oil was determined. Linalool is the principal component extracted. The optimum conditions for linalool extraction were 40℃ and 120 bar; in these conditions, linalool represents more than 75% of essential oil. We obtained an essential oil asymptotic yield of 1.2 wt % of the loaded material. Furthermore, the effect of CO_2 flow rate and mean particle size of coriander seeds was studied in the range of 0.5 to 1.5 kg/h and 0.5 to 1.0 mm, respectively.