The extraction of Tasmannia lanceolata concrete using liquid CO₂ at sub-critical conditions of pressure and temperature was investigated. A pilot-scale extractor was modified to include a second liquid metering pump for the recycling of the re-condensed CO₂. Phase equilibrium was the controlling thermodynamic element in the rate of oil extraction while mass balance transfer dominated the solubilities of lower molecular weight, non-polar individual components. Polygodial, as the heaviest and highest oxygenated component, had a different apparent solubility to the lower monoterpenes and a solubility minimum was observed for this di-aldehyde at pressures in the order of 110 bar and at temperatures of 20°C to 24°C. The large variation in density associated with liquid carbon dioxide as it approaches critical temperature and pressure provides for higher selectivity of extraction.

Item Type:	Refereed Article
Keywords:	critical carbon dioxide, liquid carbon dioxide, oleoresin, Tasmannia lanceolata, polygodial, concrete
Research Division:	Agricultural and Veterinary Sciences
Research Group:	Horticultural Production
Research Field:	Post Harvest Horticultural Technologies (incl. Transportation and Storage)
Objective Division:	Plant Production and Plant Primary Products
Objective Group:	Horticultural Crops
Objective Field:	Berry Fruit (excl. Kiwifruit)
UTAS Author:	Garland, SM (Dr Sandra Garland)
UTAS Author:	Menary, RC (Professor Robert Menary)
ID Code:	105564
Year Published:	2016
Web of Science® Times Cited:	2
Deposited By:	Tasmanian Institute of Agriculture
Deposited On:	2016-01-07
Last Modified:	2017-11-02
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