To date, according to the latest literature inputs, membranes-based technologies (microfiltration, ultrafiltration and nanofiltration) have demonstrated to meet the recovery of biologically active compounds, mainly phenolic compounds and their derivatives, from agro-food products and by-products. The goal of this paper is to provide a critical overview of the on ongoing development works aimed at improving the separation, fractionation and concentration of phenolic compounds and their derivatives from their original sources. The literature data are analyzed and discussed in relation to separation processes, molecule properties, membrane characteristics and key factors affecting the performance of such technologies. Technological advances and improvements over conventional technologies, as well as critical aspects to be further investigated are highlighted and discussed. Finally, a critical outlook about the current status for a large-scale application and the role of these processes from an environmental viewpoint is provided.

Department of Inorganic Technology University of Chemistry and Technology Prague Technická 5 Prague 6 Czech Republic

Institute on Membrane Technology ITM CNR c o University of Calabria Via P Bucci 17 C Rende Italy

Nanoscience Institute of Aragon Universidad de Zaragoza Zaragoza Spain

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Pervaporation-based membrane processes for the production of non-alcoholic beverages