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Selectivity of Supercritical CO2 in the Fractionation of Hake Liver Oil Ethyl Esters

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Journal of the American Oil Chemists' Society

Abstract

The solubility of different ethyl esters derivatized from hake liver oil in supercritical carbon dioxide was studied. A selectivity factor was used to determine optimal conditions to fractionate the ethyl ester mixture. A strong influence of solvent pressure and temperature was observed within 8.63–18.04 MPa and 40–70 °C. The lowest total solubility of the ethyl ester mixture was obtained when using supercritical carbon dioxide at the lowest density (the lowest pressure and the highest temperatures value tested). The highest discrimination against long-chain polyunsaturated fatty acids (e.g. EPA and DHA) was also obtained at these above conditions. Conversely, higher solubility and lower selectivity were obtained when solvent density increased. Considering this inverse correlation between selectivity and solubility, a single-step batch-fractionation process was designed to increase the 22:6 ethyl ester content from an initial value of 17.5% in the starting material to 55% in the final extract.

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Acknowledgments

This work was supported by a research grant from the Comisión Sectorial de Investigación Científica CSIC, Universidad de la República, Montevideo, Uruguay.

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Authors and Affiliations

  1. Laboratorio de Grasas y Aceites, Departamento de Ciencia y Tecnología de Alimentos, Facultad de Química, Universidad de la República, Avda. Gral. Flores 2124, Casilla de Correo 1157, 11800, Montevideo, Uruguay

    Iván Jachmanián, Lucía Margenat, Ana I. Torres & Maria A. Grompone

Authors
  1. Iván Jachmanián
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  2. Lucía Margenat
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  3. Ana I. Torres
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  4. Maria A. Grompone
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Correspondence to Iván Jachmanián.

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Jachmanián, I., Margenat, L., Torres, A.I. et al. Selectivity of Supercritical CO2 in the Fractionation of Hake Liver Oil Ethyl Esters. J Amer Oil Chem Soc 84, 597–601 (2007). https://doi.org/10.1007/s11746-007-1071-3

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  • DOI: https://doi.org/10.1007/s11746-007-1071-3

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