Abstract
The oil obtained from waste squid viscera consists of multi-compounds such as EPA, DHA and other valuable polyunsaturated fatty acids. The refining of this squid oil, using supercritical carbon dioxide plus ethanol, was performed in a semi-continuous flow extractor at 8 to 17 MPa and 25 to 50 °C. When 1.5% w/w ethanol was added to the solvent, the solubility of lipids was increased by up to 50% over the neat CO2 value. The extraction curves indicated mass transfer to be solubility limited. Cholesterol was co-extracted with the lipids but, with its lower solubility, less than 54% appeared in the refined oil. The results of the carbon dioxide/multi-compound squid oil system at applied to the extraction conditions were correlated with the mole fraction of the cholesterol and the density of the pure solvent.
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Abbreviations
- a, b:
-
parameters, Eq. (3)
- m:
-
amount of cholesterol in oil extracted [kg]
- n:
-
mole [g/molecular weight]
- P:
-
pressure [MPa]
- Po :
-
saturated vapor pressure of solute [MPa]
- R:
-
percentage of cholesterol reduction
- T:
-
temperature [°C]
- y:
-
mole fraction of solute in vapor phase
- ρ:
-
density [kg/m3]
- η:
-
enhancement factor
- chole:
-
cholesterol
- ext:
-
extracts
- ini:
-
initial
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Kang, KY., Ahn, DH., Wilkinson, G.T. et al. Extraction of lipids and cholesterol from squid oil with supercritical carbon dioxide. Korean J. Chem. Eng. 22, 399–405 (2005). https://doi.org/10.1007/BF02719418
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DOI: https://doi.org/10.1007/BF02719418