Response Surface Analysis and Modeling of Flaxseed Oil Yield in Supercritical Carbon Dioxide |
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Authors: | Sami Gökhan Özkal |
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Affiliation: | (1) Food Engineering Department, Pamukkale University, Kinikli, 20070 Denizli, Turkey |
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Abstract: | Supercritical fluid extraction of flaxseed oil with carbon dioxide was performed. Effects of particle size, pressure, temperature and the flow rate of supercritical carbon dioxide (SC-CO2) were investigated. Response surface methodology was used to determine the effects of pressure (30–50 MPa), temperature (50–70 °C) and SC-CO2 flow rate (2–4 g/min) on flaxseed oil yield in SC-CO2. The oil yield was represented by a second order response surface equation (R 2 = 0.993) using the Box-Behnken design of experiments. The oil yield increased significantly with increasing pressure (p < 0.01), temperature (p < 0.05) and SC-CO2 flow rate (p < 0.01). The maximum oil yield from the response surface equation was predicted as 0.267 g/g flaxseed for 15 min extraction of 5 g flaxseed particles (particle diameter <0.850 mm) at 50 MPa pressure and 70 °C temperature, with 4 g/min solvent flow rate. Total extraction time at these conditions was predicted as 22 min. |
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