Extraction of fatty oil from rose hip seed using supercritical carbon dioxide

摘要

Extraction of fatty oil from rose hip seeds was studied using supercritical carbon dioxide at various operating conditions. Extraction yield decreased with increase in pressure, but slightly increased with increase in temperature and dramatically increased with decreasing particle. The change of CO_2 flow rate didn't affect to extraction yield. About 19.94 g oil/100 g seed was obtained at 330 bar of pressure, 70°C of temperature, 3 ml/min of CO_2 flow rate and 0.556 mm of particle size. As determined by GC-FID, linoleic acid was the most abundant followed by linolenic, palmitic and stearic acid. Generally the composition of fatty oil extracted was almost independent on the extracting condition. The apparent solubility of oil in SC-CO_2 was calculated and correlated with the density using Chrastil equation.