[en] The composition of pomegranate peel, the main by-product during pomegranate processing, and some of the characteristics of the water-soluble pectins were investigated. Four tunisian pomegranate peels were subjected to hot aqueous extractions (86°C, 80min, 20mM nitric acid). Pomegranate peels yielded between 6.8% and 10.1% pectins. The extracted pectins were low methylated and were characterized by the predominance of homogalacturonan regions. Principal component analysis applied on FT-IR spectral data in the region between 4000 and 650cm(-1) differentiated the samples according to their degree of methylation. At pH 3, in the presence of 0.7% pectin, all solutions showed a rapid gel formation with G'>G″. With decreasing temperature from 90°C to 10°C, G' increased to reach a plateau at 10°C. The variation in the pectin gel formation between varieties was attributed to difference in pectin characteristics particularly the hydrodynamic volume and the neutral sugar content.
Disciplines :
Food science
Author, co-author :
Abid, Mouna; Laboratoire Analyse, Valorisation et Sécurité des Aliments, Université de Sfax, Ecole Nationale d'Ingénieurs de Sfax (ENIS), BP 1173-3038 Sfax, Tunisia.
Cheikhrouhou, S; Laboratoire Analyse, Valorisation et Sécurité des Aliments, Université de Sfax, Ecole Nationale d'Ingénieurs de Sfax (ENIS), BP 1173-3038 Sfax, Tunisia.
Renard, Catherine M G C; UMR408 SQPOV Sécurité et Qualité des Produits d'Origine Végétale, INRA, Avignon Université, F-84000 Avignon, France.
Bureau, Sylvie; UMR408 SQPOV Sécurité et Qualité des Produits d'Origine Végétale, INRA, Avignon Université, F-84000 Avignon, France.
Cuvelier, Gérard; UMR Ingénierie Procédés Aliments, AgroParisTech, INRA, Université Paris-Saclay, F-91300 Massy, France.
Attia, Hamadi; Laboratoire Analyse, Valorisation et Sécurité des Aliments, Université de Sfax, Ecole Nationale d'Ingénieurs de Sfax (ENIS), BP 1173-3038 Sfax, Tunisia.
Ayadi, Mohamed ; Laboratoire Analyse, Valorisation et Sécurité des Aliments, Université de Sfax, Ecole Nationale d'Ingénieurs de Sfax (ENIS), BP 1173-3038 Sfax, Tunisia. Electronic address: ayadimedali@yahoo.fr.
Language :
English
Title :
Characterization of pectins extracted from pomegranate peel and their gelling properties.
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