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6. Extraction and Characterization of Tannins Obtained from Fresh and Dried Tunisian Pomegranate Peel

Author

Ben-Ali, Samia, Abdalla, Hassan, Series editor, Abdul Mannan, Md., Series editor, Alalouch, Chaham, Series editor, Attia, Sahar, Series editor, Boemi, Sofia Natalia, Series editor, Bougdah, Hocine, Series editor, Bozonnet, Emmanuel, Series editor, De Bonis, Luciano, Series editor, Hawkes, Dean, Series editor, Kostopoulou, Stella, Series editor, Mahgoub, Yasser, Series editor, Mesbah Elkaffas, Saleh, Series editor, Mohareb, Nabil, Series editor, O. Gawad, Iman, Series editor, Oostra, Mieke, Series editor, Pignatta, Gloria, Series editor, Pisello, Anna Laura, Series editor, Rosso, Federica, Series editor, Kallel, Amjad, editor, Ksibi, Mohamed, editor, Ben Dhia, Hamed, editor, and Khélifi, Nabil, editor

Published
2018
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12. Extraction of phenolics from pomegranate residues: Selectivity induced by the methods

Author

Besma Khoualdia, Ben Ali Samia, Christelle Harscoat-Schiavo, Samir Hobloss, Pascale Subra-Paternault, Corinne Buré, Raphaëlle Savoire, Chimie et Biologie des Membranes et des Nanoobjets (CBMN), and École Nationale d'Ingénieurs des Travaux Agricoles - Bordeaux (ENITAB)-Institut de Chimie du CNRS (INC)-Université de Bordeaux (UB)-Centre National de la Recherche Scientifique (CNRS)

Subjects
General Chemical Engineering, 01 natural sciences, pomegranate residue, chemistry.chemical_compound, 0404 agricultural biotechnology, ellagic acid, [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering, Physical and Theoretical Chemistry, Sugar, Punicalagin, sugar content, Ethanol, Chromatography, 010405 organic chemistry, Chemistry, Extraction (chemistry), 04 agricultural and veterinary sciences, Condensed Matter Physics, 040401 food science, 0104 chemical sciences, Polyphenol, selective extraction, punicalagin, Composition (visual arts), Selectivity, phenolic extracts, Ellagic acid
Abstract

International audience; Pomegranate industrial residues are rich in highly valuable phenolics, especially the bioactive punicalagin (PU) and ellagic acid (EA). The effect of extraction conditions on the recovery of polyphenols was investigated with special insight at the selectivity for EA and PU, along with the monitoring of sugar extraction. Macerations in ethanol and/or water, extractions by scCO2:ethanol mixtures and pressurized ethanol were compared on the basis of yields, kinetics and extract composition. High extraction yields up to 61g/100gresidue were obtained because of significant extraction of sugars evenwith CO2-based solvents. The TPC and sugar extraction yields were sensitive to the solvent polarity and pressure. Thirty-two phenolics were identified in most extracts whereas in scCO2:EtOH extracts purity of EA with respect to other phenolics was maximal, thus highlighting the selectivity of this technique. For the first time, extracts of high purity in EA and devoid of PU were produced in only one step.

Published
2021

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