Supercritical extraction of borage seed oil coupled to conventional solvent extraction of antioxidants |
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Authors: | Carmen Soto Enma Conde Andrés Moure María Elvira Zúñiga Herminia Domínguez |
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Affiliation: | 1. Centro Regional de Estudios en Alimentos Saludables, Blanco 1623, of. 1402, Valparaíso, Chile;2. Departamento de Enxeñería Química, Universidade de Vigo (Campus Ourense), Ourense, Spain;3. Centro Regional de Estudios en Alimentos Saludables, Blanco 1623, of. 1402, Valparaíso, Chile Escuela de Ingeniería Bioquímica, Facultad de Ingeniería, Pontificia Universidad Católica de Valparaíso, Av. Brasil 2157, Valparaíso, Chile |
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Abstract: | This paper describes the extraction of borage seed oil by supercritical carbon dioxide (SC-CO2) and the further extraction of antioxidants from the SC-CO2-defatted borage meal with organic solvents (water, methanol, ethanol and ethyl acetate). The optimal conditions for oil extraction were obtained at 303 and 323 K at 200 bar, 2.5 h and a continuous flow of CO2 of 1.5 L/h introduced through the bottom when the operating pressure and temperature were reached, attaining a yield of 60%. Borage oil is rich in unsaturated fatty acids; oleic acid, linoleic acid and linolenic acid accounted for 74% of the total fatty acid content under the above conditions. The highest extraction yield was achieved using water or methanol as extracting solvent from the SC-CO2-defatted borage meal at 303 K and pressures of 200 and 150 bar for water and methanol, respectively. The most potent extracts, according to all methods tested, were obtained with water and methanol. |
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Keywords: | Antioxidants Borage oil seed Carbon dioxide supercritical fluid extraction Oil characterization |
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