Optimization of Supercritical Extraction of Oil from Onion by Supercritical CO2

摘要

In this study, the supercritical CO2 extracting technology was applied to extract volatile oil from freeze-dried onion powders, single factor experiment and orthogonal array design were used to study the influence of extracting pressure, extracting temperature, extracting time and flow rate of CO2 on the extracting ratio of volatile oil. The optimum extracting parameters were established with extracting pressure of 20 MPa, extracting temperature of 35 °C, flow rate of CO2 of 14 kg·h~(-1) and the extracting time of 2.5 h. The optimum technology for supercritical CO2 extraction of volatile oil from freeze-dried onion powders was very efficient and extraction yield is 0.53 %.