Supercritical Carbon Dioxide Extraction of Borage Seed Oil
نویسندگان
چکیده
The oil from the seeds of Borago officinalis L. (borage) is a major commercial source of ?-linolenic acid. The fatty acid has a great potential therapeutic value in the treatment of several diseases. In the present work the efficiency of high pressure extraction of borage seed oil containing ?linolenic acid in high concentrations was investigated. Extraction was performed by semicontinuous flow apparatus using supercritical carbon dioxide at pressures from 200 to 300 bar and temperatures 40°C to 60°C. The flow rate of carbon dioxide was maintained constant at 3.5 g/min. Composition of oil extracted was determined by gas chromatographic analysis. The best results of borage seed oil extraction were obtained at 300 bar and 40°C, where the quality of oil due to ?-linolenic acid content was the highest. The yield obtained by supercritical extraction was very similar to that obtained by conventional extraction using nhexane as solvent. Dynamic behaviour of the extraction runs was analysed by a mathematical model and diffusion coefficients of the components within the solid and in the bulk were determined. Results show that the cumulative rate data calculated by the mathematical model are in fairly good agreement with the data obtained experimentally.
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