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Superheated liquids for extraction of solid residues from winemaking processes

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Abstract

Solid residues from winemaking processes have been subjected to extraction with superheated water–ethanol mixtures. Identification and characterization of the extracted compounds were achieved by spectrophotometry, gas chromatography with either flame-ionization or mass detectors, and-high performance liquid chromatography with UV detection. Extraction was performed statically with single or repeated cycles. All variables affecting the extraction process have been studied and optimised. The extraction time and temperature were 65 min and 210 °C, respectively. Extracts comprised two phases—an aqueous phase, rich in phenolic compounds, and an oily phase, comprising mainly fatty acids. The method allows manipulation of extract composition by changing the applied pressure, temperature, water-to-ethanol ratio, and pH. The method is faster than traditional extraction procedures for obtaining valuable compounds from these residues.

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Acknowledgments

The Spanish Comisión Interministerial de Ciencia y Tecnología (CICyT) is thanked for financial support (Project AGL2000–0321-P4–03).

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Authors and Affiliations

  1. R&D Department, Pérez Barquero, 27 S.A. Avda. de Andalucía, 14550, Montilla, Córdoba, Spain

    J. González-Rodríguez

  2. Laboratory and Enologic Research of Castilla, LIEC, Polígono industrial, calle XV, parcela R-113, 13200, Manzanares (Ciudad Real), Spain

    P. Pérez-Juan

  3. Department of Analytical Chemistry, University of Córdoba, Campus of Rabanales, Annex C-3, 14071, Córdoba, Spain

    M. D. Luque de Castro

Authors
  1. J. González-Rodríguez
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  2. P. Pérez-Juan
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  3. M. D. Luque de Castro
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Correspondence to M. D. Luque de Castro.

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González-Rodríguez, J., Pérez-Juan, P. & de Castro, M.D.L. Superheated liquids for extraction of solid residues from winemaking processes. Anal Bioanal Chem 377, 1190–1195 (2003). https://doi.org/10.1007/s00216-003-2194-5

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  • DOI: https://doi.org/10.1007/s00216-003-2194-5

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