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Integrated Countercurrent Two-Stage Extraction and Cream Demulsification in Enzyme-Assisted Aqueous Extraction of Soybeans

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Journal of the American Oil Chemists' Society

Abstract

Countercurrent two-stage extraction and cream demulsification were fully integrated and demonstrated on laboratory scale (2 kg soybeans) wherein the enzyme used for demulsifying the cream was used in the extraction steps of enzyme-assisted aqueous extraction processing (EAEP). Protease enzyme (Protex 6L) entered the integrated EAEP process in the demulsification step and the skim, which contained the enzyme, resulting from breaking the cream emulsion was recycled upstream into the second extraction stage and then to the first extraction stage. Oil, protein and solids extraction yields of 96.1 ± 1.4%, 89.3 ± 1.0%, and 81.2 ± 2.0%, respectively, were achieved with steady-state operation of integrated EAEP. Higher degrees of protein hydrolysis (DH) were obtained when using the integrated process compared with the process when not recycling the enzyme. Higher extents of hydrolysis probably increased emulsion formation thereby affecting lipid distribution among the fractions. Overall free oil recovery was reduced due to more oil shifting to the skim fraction.

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Acknowledgments

This work was supported by funds provided by the U. S. Department of Agriculture, Cooperative State Research, Education, and Extension Service, Grant #2009-34432-20057.

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Authors and Affiliations

  1. Center for Crops Utilization Research, Iowa State University, 1041 Food Sciences Building, Ames, IA, 50011-1061, USA

    J. M. L. N. de Moura, S. Jung & L. A. Johnson

  2. Department of Food Science and Human Nutrition, Iowa State University, Ames, IA, 50011-1061, USA

    D. Maurer, S. Jung & L. A. Johnson

Authors
  1. J. M. L. N. de Moura
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  2. D. Maurer
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  3. S. Jung
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  4. L. A. Johnson
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Correspondence to L. A. Johnson.

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de Moura, J.M.L.N., Maurer, D., Jung, S. et al. Integrated Countercurrent Two-Stage Extraction and Cream Demulsification in Enzyme-Assisted Aqueous Extraction of Soybeans. J Am Oil Chem Soc 88, 1045–1051 (2011). https://doi.org/10.1007/s11746-011-1759-2

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  • DOI: https://doi.org/10.1007/s11746-011-1759-2

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