SUPERCRITICAL CO2 EXTRACTION OF OILS FROM RED GRAPE VARIETIES: YIELDS AND EXTRACTION PARAMETERS

In this work, the extraction by supercritical carbon (IV) oxide of grape seed oil from five red grape varieties were investigated. Apart from indigenous variety Prokupac, as a domestic, and Merlot and Cabernet Sauvignon, as international grape varieties the most represented in Republic of Serbia, Pinot Noir and Gamay were studied as well. Extraction conditions were: temperature of 50 °C, 250 bar pressure and 0.3kg/h flow rate of CO2. It was shown that the extraction kinetics of international grape varieties, similar mutually differ significantly from domestic one. The obtained oil yields were in the range 8,3%w/w (Gamay) to 10,4%w/w (Pinot Noir) for international varieties and 4,96% w/w for domestic variety. Mathematical model “Sovova” was applied in order to define transport parameters regulating the oil mass transfer inside the seed particles and determine agreement between experimental and model curves. The interpretation of results was done having in mind the differences of grade seed morphologies (outer surfaces and inner layers) which was investigated by SEM analysis