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Membrane-Based Clarification and Fractionation of Red Wine Lees Aqueous Extracts

Institute on Membrane Technology, ITM-CNR, c/o University of Calabria, via P. Bucci, 17/C, I-87036 Rende (Cosenza), Italy
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Polymers 2019, 11(7), 1089; https://doi.org/10.3390/polym11071089
Received: 22 May 2019 / Revised: 20 June 2019 / Accepted: 24 June 2019 / Published: 26 June 2019
(This article belongs to the Special Issue Polymer for Separation)
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Abstract

Polyvinylidenefluoride (PVDF) hollow fiber membranes prepared in laboratory through the inversion phase method were characterized and used to clarify an aqueous extract from red wine lees. Steady-state permeate fluxes of 53 kg/m2h were obtained in the treatment of the aqueous extract in selected operating conditions. Suspended solids were completely retained by the hollow fiber membranes while bioactive compounds, including polyphenols, anthocyanins, and resveratrol were recovered in the permeate stream. The clarified stream was then fractionated by nanofiltration (NF). Three different commercial membranes, in flat-sheet configuration (NP010 and NP030 from Microdyn-Nadir, MPF36 from Koch Membrane Systems), were selected and tested for their productivity and selectivity towards sugars and bioactive compounds, including phenolic compounds, anthocyanins, and resveratrol. All selected membranes showed high retention towards anthocyanins (higher than 93%). Therefore, they were considered suitable to concentrate anthocyanins from clarified wine lees extracts at low temperature. On the other hand, NF permeate streams resulted enriched in phenolic compounds and resveratrol. Among the selected membranes, the MPF36 exhibited the lowest retention towards resveratrol (10%) and polyphenols (26.3%) and the best separation factor between these compounds and anthocyanins. View Full-Text
Keywords: winery effluents; bioactive compounds; membrane-based operations; biorefinery winery effluents; bioactive compounds; membrane-based operations; biorefinery
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Cassano, A.; Bentivenga, A.; Conidi, C.; Galiano, F.; Saoncella, O.; Figoli, A. Membrane-Based Clarification and Fractionation of Red Wine Lees Aqueous Extracts. Polymers 2019, 11, 1089.

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