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Extraction of flaxseed oil was performed with supercritical carbon dioxide (SC-CO 2 ). To investigate the effects of pressure and temperature on the solubility of oil and oil yield, three isobaric (21, 35, and 55 MPa) and two isothermal (50 and 70°C) extraction conditions were selected. Although the maximal solubility of flaxseed oil, 11.3 mg oil/g CO 2 , was obtained at 70°C/55 MPa, the oil yield obtained after 3 h of extraction at this condition was only 25% (g oil/g seed × 100), which represented 66% of the total available oil of the flaxseed. Lipid composition and FFA and tocol (tocopherol and tocotrienol) contents of the oils obtained by both SC-CO 2 and petroleum ether extraction were determined. The α-linolenic acid content of the SC-CO 2 -extracted oil was higher than that obtained by solvent extraction.

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Extraction of poppy seed oil with supercritical carbon dioxide (SC-CO 2 ) was performed and the effect of extraction conditions on oil solubility and yield as well as oil composition was evaluated. Within the temperature (50 to 70 °C) and pressure (21 to 55 MPa) ranges studied, 55 MPa/70 °C gave the highest oil solubility (24.1 mg oil/g CO 2 ) and oil yield (38.7 g oil/100g seed). Fatty acid composition of the oil obtained with SC-CO 2 at 55 MPa/70 °C was similar to that of petroleum ether-extracted oil (p > 0.05) with linoleic acid making up 69.0 to 73.7% of fatty acids. Tocol content of the SC-CO 2 -extracted oils varied from 22.37 to 33.35 mg/100 g oil, which was higher than that of petroleum ether-extracted oil (15.28 mg/100 g oil). Poppy seed oil may have potential in the rapidly growing specialty oil market.

Antioxidant and free radical scavenging activities of the extracts of sumac (Rhus coriaria) fruits and cassia (Cinnamomum cassia) cortex were studied. Plant samples were extracted with methanol:water (80:20) and an aliquot of each extract was fractionated using n-hexane and ethyl acetate. Antioxidant activities of n-hexane, ethyl acetate and water fractions were measured using Fe +2 induced linoleic acid-TBA-peroxidation reaction and the Rancimat methods. Free radical scavenging activities of the fractions were determined on 2,2-diphenyl-1-picrylhydrazyl radical (DPPH). Results were compared with those for butylated hydroxyanisole (BHA), butylated hydroxytoluene (BHT). The ethyl acetate fraction of plant materials exhibited a marked antiradical activity on DPPH . , higher than those of BHT and BHA; however, their antioxidant activity on the linoleic acid peroxidation was less than those of BHA and BHT.

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