naa a22 4500 510726852 CHVBK 20180411082938.0 cr unu---uuuuu 180411e20130501xx s 000 0 eng 10.1007/s11947-012-0869-7 doi (NATIONALLICENCE)springer-10.1007/s11947-012-0869-7 Extraction of Polyphenols from Red Grape Pomace Assisted by Pulsed Ohmic Heating [Elektronische Daten] [Nada El Darra, Nabil Grimi, Eugène Vorobiev, Nicolas Louka, Richard Maroun] The present work is devoted to the investigation of the effect of pulsed ohmic heating (POH) on cells membrane damage and intensification of polyphenols extraction from red grape pomace. Untreated, POH-treated and freeze-thawed samples were compared. The effects of electric field strength (E = 100-800V/cm) and the percentage of ethanol in water (E/W = 0-50%) on polyphenols extraction were discussed. Measurements of electrical conductivity and electric energy consumption were performed for POH pretreatment optimization. Results show that POH treatment results in cells membrane denaturation. This permeabilization increases with the elevation of electric field strength and temperature. POH pretreatment accelerates the extraction kinetics of total polyphenols from grape pomace. Freeze-thawed samples are always accompanied with a high degree of cell damage and high concentration of polyphenols in the extract. The highest extraction yields were obtained with a POH pretreatment at 400V/cm followed by a diffusion step for 60min at 50°C and with a solvent composed of 30% of ethanol in water. In these conditions, the polyphenol content was 36% more than untreated samples. The proposed technique (POH pretreatment) appears to be promising for future industrial applications of polyphenols extraction from pomace. Springer Science+Business Media, LLC, 2012 Grape pomace nationallicence Pulsed ohmic heating nationallicence Cell membrane denaturation nationallicence Polyphenol content nationallicence El Darra Nada Département de Génie des Procédés Industriels, Laboratoire Transformations Intégrées de la Matière Renouvelable (UTC/ESCOM, EA 4297 TIMR), Centre de Recherche de Royallieu, Université de Technologie de Compiègne, B.P. 20529-60205, Compiègne Cedex, France aut Grimi Nabil Département de Génie des Procédés Industriels, Laboratoire Transformations Intégrées de la Matière Renouvelable (UTC/ESCOM, EA 4297 TIMR), Centre de Recherche de Royallieu, Université de Technologie de Compiègne, B.P. 20529-60205, Compiègne Cedex, France aut Vorobiev Eugène Département de Génie des Procédés Industriels, Laboratoire Transformations Intégrées de la Matière Renouvelable (UTC/ESCOM, EA 4297 TIMR), Centre de Recherche de Royallieu, Université de Technologie de Compiègne, B.P. 20529-60205, Compiègne Cedex, France aut Louka Nicolas Faculté des Sciences, Université Saint-Joseph de Beyrouth, Rue de Damas, Mar Mikhael 1104 2020, B.P. 17-5208, 1107 2050, Beirut, Lebanon aut Maroun Richard Faculté des Sciences, Université Saint-Joseph de Beyrouth, Rue de Damas, Mar Mikhael 1104 2020, B.P. 17-5208, 1107 2050, Beirut, Lebanon aut Food and Bioprocess Technology Springer-Verlag 6/5(2013-05-01), 1281-1289 1935-5130 6:5<1281 2013 6 11947 https://doi.org/10.1007/s11947-012-0869-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11947-012-0869-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- El Darra Nada Département de Génie des Procédés Industriels, Laboratoire Transformations Intégrées de la Matière Renouvelable (UTC/ESCOM, EA 4297 TIMR), Centre de Recherche de Royallieu, Université de Technologie de Compiègne, B.P. 20529-60205, Compiègne Cedex, France aut NATIONALLICENCE 700 1- Grimi Nabil Département de Génie des Procédés Industriels, Laboratoire Transformations Intégrées de la Matière Renouvelable (UTC/ESCOM, EA 4297 TIMR), Centre de Recherche de Royallieu, Université de Technologie de Compiègne, B.P. 20529-60205, Compiègne Cedex, France aut NATIONALLICENCE 700 1- Vorobiev Eugène Département de Génie des Procédés Industriels, Laboratoire Transformations Intégrées de la Matière Renouvelable (UTC/ESCOM, EA 4297 TIMR), Centre de Recherche de Royallieu, Université de Technologie de Compiègne, B.P. 20529-60205, Compiègne Cedex, France aut NATIONALLICENCE 700 1- Louka Nicolas Faculté des Sciences, Université Saint-Joseph de Beyrouth, Rue de Damas, Mar Mikhael 1104 2020, B.P. 17-5208, 1107 2050, Beirut, Lebanon aut NATIONALLICENCE 700 1- Maroun Richard Faculté des Sciences, Université Saint-Joseph de Beyrouth, Rue de Damas, Mar Mikhael 1104 2020, B.P. 17-5208, 1107 2050, Beirut, Lebanon aut NATIONALLICENCE 773 0- Food and Bioprocess Technology Springer-Verlag 6/5(2013-05-01), 1281-1289 1935-5130 6:5<1281 2013 6 11947 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer