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Supercritical fluid extraction of sunflower seed oil with CO 2 ‐ethanol mixtures
Author(s) -
Cocero María José,
Calvo Lourdes
Publication year - 1996
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02523527
Subject(s) - ethanol , sunflower oil , supercritical fluid , extraction (chemistry) , chemistry , supercritical carbon dioxide , chromatography , sunflower , solubility , supercritical fluid extraction , alcohol , carbon dioxide , organic chemistry , food science , agronomy , biology
The effect of ethanol addition to supercritical carbon dioxide (SC‐CO 2 ), up to 20%, on sunflower seed oil extraction over the range of 150 to 350 bars and 42 to 80°C was studied. A nonrecirculating home‐made bench‐scale system was used as extraction equipment. The oil‐SC‐CO 2 ‐ethanol mixture was reduced to atmospheric pressure in a test tube, where two phases, oil and ethanol, were obtained and ethanol‐saturated CO 2 was liberated to the atmosphere. Results show that sunflower oil solubility in SC‐CO 2 greatly increases with addition of ethanol as entrainer over the whole range of pressure and temperature conditions. Some phospholipids are co‐extracted at levels directly proportional to the added ethanol. Moreover, a large amount of phospholipids was recovered in the ethanolic phase. Acidity of the extracted oil with ethanol as entrainer was lower than that without alcohol. Part of the free fatty acids was found in the ethanolic phase.