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Supercritical CO2 Extraction Optimization of Onion Oil Using Response Surface Methodology
Authors:C.‐L. Ye  Y.‐F. Lai
Affiliation:School of Biological and Chemical Engineering, Zhejiang University of Science and Technology, Hangzhou, China
Abstract:Response surface methodology was employed to optimize the conditions of supercritical CO2 extraction of the oil from freeze‐dried onion powder. The effects of pressure, temperature and extraction time on the yield of oil were investigated. The maximum extraction yield of 4.69 ± 0.04 g/kg dry basis was achieved at a pressure of 20.6 MPa, a temperature of 40.6 °C, a time of 260 min, a CO2 flow rate of 22 L h–1, and an entrainer ratio of 0.1 mL absolute ethanol per gram dry basis. The chemical composition of the oil was analyzed by gas chromatography‐mass spectrometry. The most representative compounds of the essential oil were organosulfur‐containing compounds and, among these, the main constituents were methyl 5‐methylfuryl sulfide (18.30 %), methyl 3,4‐dimethyl‐2‐thienyl disulfide (11.75 %) and 1‐propenyl propyl disulfide (9.72 %).
Keywords:Allium cepa  Response surface methodology  Supercritical CO2 extraction
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