Extraction and Characterization of Essential Oil of Korean Orange Peel Obtained from Supercritical CO2 Extraction
2018
Jo, W., Ilshin Autoclave Co. Ltd., Daejeon, Republic of Korea | Marcel Jonathan Hidajat, Ilshin Autoclave Co. Ltd., Daejeon, Republic of Korea | Park, J., Ilshin Autoclave Co. Ltd., Daejeon, Republic of Korea | Ji, S., Ilshin Autoclave Co. Ltd., Daejeon, Republic of Korea | Noh, J., Ilshin Autoclave Co. Ltd., Daejeon, Republic of Korea | Kim, H., Ilshin Autoclave Co. Ltd., Daejeon, Republic of Korea
This research focuses on the extraction yield and composition of essential oil obtained from Korean orange peel waste by using supercritical CO₂ extraction method. Various parameters were observed, such as temperature, pressure, particle size, and co-solvent participation. The result showed that the extraction yield increased at high pressure, low temperature, and small particle size. The high pressure increased CO₂ density which leads to high solvating power while low temperature increased the solubility of terpenes and small particle size enables the CO₂ molecules to spread widely and penetrate deeply on the orange peel, reducing its mass transfer resistance. Gas chromatography (GC) was conducted to observe the compounds inside the essential oil and the result showed that terpenes (monoterpenes and sesquiterpenes) and other compounds (alcohol, esters, ketones) were present. Limonene, as the main compound in the essential oil, was mostly extracted at 40o C and 100-200 bar, with the yield ranges from 0.7-1.0% (w/w). Ethanol was used as co-solvent and proven to increase the yield of essential oil by 1.4 times.
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